阅读说明：本技术 散射通信方法、信号发射装置、信号接收装置及系统 (Scattering communication method, signal transmitting device, signal receiving device and system ) 是由 徐信 王伟 于 2021-07-22 设计创作，主要内容包括：本发明提供一种散射通信方法、信号发射装置、信号接收装置及系统。该方法用于发送端包括：根据循环通信方案与接收端进行通信；其中,所述循环通信方案包括：对第一设定帧数的信号进行跳频处理,获得跳频信号,并发送所述跳频信号至接收端；接收来自接收端的目标通信频率和目标调制编码方式,根据所述目标通信频率和所述目标调制编码方式对第二设定帧数的信号进行选频处理获得选频发射信号,并发送所述选频发射信号至所述接收端。本发明只需对跳频散射通信控制协议进行优化即可实现通信,提高了数据传输速率和通信性能。(The invention provides a scattering communication method, a signal transmitting device, a signal receiving device and a system. The method is used for a sending end and comprises the following steps: communicating with a receiving end according to a cyclic communication scheme; wherein the recurring communication scheme comprises: carrying out frequency hopping processing on the signals with the first set frame number to obtain frequency hopping signals, and sending the frequency hopping signals to a receiving end; receiving a target communication frequency and a target modulation coding mode from a receiving end, carrying out frequency selection processing on signals with a second set frame number according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals, and sending the frequency selection transmitting signals to the receiving end. The invention can realize communication only by optimizing the frequency hopping scattering communication control protocol, thereby improving the data transmission rate and the communication performance.)

1. A scatter communication method, for a transmitting end, comprising:

communicating with a receiving end according to a cyclic communication scheme;

wherein the recurring communication scheme comprises:

carrying out frequency hopping processing on the signals with the first set frame number to obtain frequency hopping signals, and sending the frequency hopping signals to a receiving end;

receiving a target communication frequency and a target modulation coding mode from the receiving end, carrying out frequency selection processing on signals with a second set frame number according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals, and sending the frequency selection transmitting signals to the receiving end.

2. The method of claim 1, wherein the frequency hopping process comprises:

carrying out channel coding, channel interleaving, modulation and group hopping on the signals in sequence to obtain modulated signals;

and carrying out up-conversion on the modulation signal under the control of a frequency hopping pattern to obtain the frequency hopping signal.

3. The method of claim 1, further comprising:

inserting a pilot signal when performing group hopping on a signal; wherein the pilot signal is a constant-envelope zero-autocorrelation CAZAC sequence.

4. A scatter communication method, for a receiving end, comprising:

receiving a frequency hopping signal with a first set frame number from a sending end, and acquiring a channel evaluation signal according to the frequency hopping signal;

determining a target communication frequency and a target modulation coding mode according to the channel evaluation signal;

sending the target communication frequency and the target modulation coding mode to the sending end;

and receiving the frequency-selecting transmitting signal with the second set frame number from the receiving end.

5. The method of claim 4, wherein obtaining a channel assessment signal from the frequency hopping signal comprises:

sequentially carrying out down-conversion and debounce on the frequency hopping signal to obtain a channel evaluation signal; wherein the channel estimation signal is a CAZAC sequence.

6. The method of claim 5, wherein determining a target communication frequency and a target modulation and coding scheme from the channel estimation signal comprises:

determining a signal-to-noise ratio from the channel assessment signal;

and determining the target communication frequency according to the signal-to-noise ratio meeting the set condition, and determining the target modulation coding mode based on the corresponding relation between the signal-to-noise ratio and the modulation coding mode.

7. The method of claim 5, further comprising, after the sequentially downconverting and debounce the frequency hopping signal:

and demodulating and equalizing the frequency hopping signal after the frequency hopping is carried out, and carrying out channel de-interleaving and channel decoding operation to obtain an output signal.

8. A signal transmitting apparatus, comprising:

the frequency hopping processing module is used for carrying out frequency hopping processing on the signals with the first set frame number to obtain frequency hopping signals;

the first signal processing module is used for sending the frequency hopping signal to a receiving end and receiving a target communication frequency and a target modulation coding mode from the receiving end;

the frequency selection processing module is used for carrying out frequency selection processing on the signals with the second set frame number by the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals;

the first signal processing module is further configured to send the frequency-selective transmission signal to the receiving end.

9. A signal receiving apparatus, comprising:

the second signal processing module is used for receiving the frequency hopping signal with the first set frame number from the sending end;

a channel estimation signal obtaining module, configured to obtain a channel estimation signal according to the frequency hopping signal;

the channel evaluation module is used for determining a target communication frequency and a target modulation coding mode according to the channel evaluation signal;

the second signal processing module is further configured to send the target communication frequency and the target modulation and coding scheme to the sending end, and receive a frequency-selective transmission signal with a second set frame number from a receiving end.

10. A scatter communication system comprising the signal transmission apparatus of claim 8 and the signal reception apparatus of claim 9.

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a scattering communication method, a signal transmitting apparatus, a signal receiving apparatus, and a system.

Background

Tropospheric scatter communication is a beyond-the-horizon communication that is achieved by utilizing the reflection and scattering effects of atmospheric inhomogeneities in the troposphere on electromagnetic waves. The troposphere scattering communication has the characteristics of long single-hop communication distance, strong obstacle crossing capability, high reliability, good nuclear explosion resistance and interception resistance and the like, and is an important military and civil wireless communication means. Besides the disadvantage of large path loss, the troposphere scattering channel also has time-varying fading characteristics caused by scatterer motion and multipath propagation, so that a receiving end must adopt an anti-fading technology to overcome the influence of a bad troposphere scattering channel on a communication signal, and the realization of the existing anti-fading scheme aiming at troposphere scattering communication and protocol control are complex.

Disclosure of Invention

The embodiment of the invention provides a scattering communication method, a signal transmitting device, a signal receiving device and a system, which aim to solve the problems of realization of an anti-fading scheme of troposphere scattering communication and complex protocol control.

In a first aspect, an embodiment of the present invention provides a scattering communication method, used at a sending end, including:

communicating with a receiving end according to a cyclic communication scheme;

wherein the recurring communication scheme comprises:

carrying out frequency hopping processing on the signals with the first set frame number to obtain frequency hopping signals, and sending the frequency hopping signals to a receiving end;

receiving a target communication frequency and a target modulation coding mode from the receiving end, carrying out frequency selection processing on signals with a second set frame number according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals, and sending the frequency selection transmitting signals to the receiving end.

In one possible implementation, the frequency hopping process includes:

carrying out channel coding, channel interleaving, modulation and group hopping on the signals in sequence to obtain modulated signals;

and carrying out up-conversion on the modulation signal under the control of a frequency hopping pattern to obtain the frequency hopping signal.

In one possible implementation, the method further includes:

inserting a pilot signal when performing group hopping on a signal; wherein the pilot signal is a Constant Amplitude Zero Auto-correlation (CAZAC) sequence.

In a possible implementation manner, the first set frame number is greater than or equal to 3; the second set frame number is more than or equal to 1; the sum of the first set frame number and the second set frame number is equal to the channel coherence time.

In a possible implementation manner, a difference between the target modulation coding scheme and the coding scheme of the frequency hopping signal is 3 or 4 db.

In one possible implementation, the frequency hopping process employs 8 frequency hops.

In one possible implementation, the slot length is 2 ms; the time of each hop is 0.25 ms; the duration of the frequency hopping processing is 10 ms; the frequency selection processing lasts for 30 ms.

In a second aspect, an embodiment of the present invention provides a scattering communication method, which is used for a receiving end, and includes:

receiving a frequency hopping signal with a first set frame number from the sending end, and acquiring a channel evaluation signal according to the frequency hopping signal;

determining a target communication frequency and a target modulation coding mode according to the channel evaluation signal;

sending the target communication frequency and the target modulation coding mode to the sending end;

and receiving the frequency-selecting transmitting signal with the second set frame number from the receiving end.

In one possible implementation manner, obtaining a channel estimation signal according to the frequency hopping signal includes:

sequentially carrying out down-conversion and debounce on the frequency hopping signal to obtain a channel evaluation signal; wherein the channel estimation signal is a CAZAC sequence.

In one possible implementation manner, the determining a target communication frequency and a target modulation and coding scheme according to the channel estimation signal includes:

determining a signal-to-noise ratio from the channel assessment signal;

and determining the target communication frequency according to the signal-to-noise ratio meeting the set condition, and determining the target modulation coding mode based on the corresponding relation between the signal-to-noise ratio and the modulation coding mode.

In a possible implementation manner, after the sequentially performing down-conversion and de-hopping on the frequency hopping signal, the method further includes:

and demodulating and equalizing the frequency hopping signal after the frequency hopping is carried out, and carrying out channel de-interleaving and channel decoding operation to obtain an output signal.

In a third aspect, an embodiment of the present invention provides a signal transmitting apparatus, including:

the frequency hopping processing module is used for carrying out frequency hopping processing on the signals with the first set frame number to obtain frequency hopping signals;

the first signal processing module is used for sending the frequency hopping signal to a receiving end and receiving a target communication frequency and a target modulation coding mode from the receiving end;

the frequency selection processing module is used for carrying out frequency selection processing on the signals with the second set frame number by the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals;

the first signal processing module is further configured to send the frequency-selective transmission signal to the receiving end.

In a fourth aspect, an embodiment of the present invention provides a signal receiving apparatus, including:

the second signal processing module is used for receiving the frequency hopping signal with the first set frame number from the sending end;

a channel estimation signal obtaining module, configured to obtain a channel estimation signal according to the frequency hopping signal;

the channel evaluation module is used for determining a target communication frequency and a target modulation coding mode according to the channel evaluation signal;

the second signal processing module is further configured to send the target communication frequency and the target modulation and coding scheme to the sending end, and receive a frequency-selective transmission signal with a second set frame number from a receiving end.

In a fifth aspect, an embodiment of the present invention provides a scattering communication system, which is characterized by including the signal transmitting apparatus provided in the third aspect and the signal receiving apparatus provided in the third aspect.

In a sixth aspect, an embodiment of the present invention provides a terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor, when executing the computer program, implements the steps of the method according to the first aspect or any possible implementation manner of the first aspect.

In a seventh aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method according to the first aspect, any possible implementation manner of the first aspect, the second aspect, or any possible implementation manner of the second aspect.

The embodiment of the invention provides a scattering communication method, a signal transmitting device, a signal receiving device and a system, wherein a transmitting end and a receiving end are communicated through a cyclic communication scheme, the transmitting end performs frequency hopping processing on a signal with a first set frame number to obtain a frequency hopping signal, and the frequency hopping signal is transmitted to the receiving end so as to determine a target communication frequency and a target modulation and coding mode according to the signal with the first set frame number. And after receiving the target communication frequency and the target modulation coding mode from the receiving end, the sending end carries out frequency selection processing on the signals with the second set frame number according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals and sends the frequency selection transmitting signals to the receiving end. The transmitting signal is communicated according to the target communication frequency and the target modulation coding mode, so that the communication rate and the communication quality are improved. The scheme of the invention realizes communication only by optimizing the frequency hopping scattering communication control protocol, and improves the data transmission rate and the communication performance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic flow chart of a scatter communication method according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a scatter communication method according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a signal transmitting apparatus according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a signal receiving apparatus according to another embodiment of the present invention;

fig. 7 is a schematic diagram of a terminal according to an embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

Tropospheric scatter communication is a beyond-the-horizon communication that is achieved by utilizing the reflection and scattering effects of atmospheric inhomogeneities in the troposphere on electromagnetic waves. The troposphere scattering communication has the characteristics of long single-hop communication distance, strong obstacle crossing capability, high reliability, good nuclear explosion resistance and interception resistance and the like, and is an important military and civil wireless communication means. In the field of tropospheric scatter communications, multi-antenna spatial diversity, frequency diversity, and time diversity techniques are commonly employed to combat channel fading.

In the prior art, a frequency hopping method suitable for a scattering communication system is provided, which utilizes a hidden diversity technology to perform broadband frequency hopping to resist scattering channel fading, thereby simplifying the complexity of the traditional scattering communication system, reducing the system cost, improving the performance of the traditional scattering communication system, and meanwhile, the broadband frequency hopping scattering communication also has the advantages of supporting orthogonal frequency hopping networking and the like. Although broadband frequency hopping scattering communication has many advantages, the power dispersion phenomenon exists as the traditional space diversity, namely, the existing deep fading frequency wastes effective transmitting power, so that the anti-fading performance of the communication is still greatly improved.

In the existing scheme, a self-adaptive frequency-selecting scattering communication technology based on space diversity and modem design and implementation are also provided, an in-band frequency-selecting and linear frequency-modulating signal detection evaluation channel is used, a scattering communication system usually uses a certain frequency or a plurality of frequencies for communication within a communication bandwidth of 20-30 MHz, frequency selection is carried out within the communication bandwidth of 20-30 MHz, and the 'in-band frequency selection' is changed into 'broadband frequency selection', so that the bandwidth of a new communication system reaches hundreds of MHz. Theoretical analysis and test results show that the adaptive frequency selection technology has great performance improvement compared with the diversity technology, which means that the broadband frequency hopping scattering communication technology is used as a hidden diversity scattering communication technology, and the performance of the broadband frequency hopping scattering communication technology is not good as that of the adaptive frequency selection technology. Although the communication performance of the adaptive frequency selection technology is good, the realization and the protocol control are complex, and the technology starting point is high.

Based on the above problems, the present application provides a communication scheme, that is, in broadband frequency hopping scattering communication, frequency hopping communication is performed for a period of time, then a frequency selection communication stage is performed by using an estimation result of a channel in a frequency hopping communication process, communication is performed by using one frequency with the best channel quality or a plurality of better frequencies, frequency selection communication is performed for a period of time, and then frequency hopping communication is performed, and the above steps are repeated cyclically. The scattering communication combining frequency hopping and frequency selection can be realized only by optimizing a frequency hopping scattering communication control protocol, and the realization is simple. Because the frequency selection technology has greatly improved performance compared with the diversity technology, the scattering communication combining frequency hopping and frequency selection has higher data transmission rate and communication performance compared with the pure frequency hopping scattering communication.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.

Fig. 1 is a flowchart illustrating a scatter communication method according to an embodiment of the present invention. As shown in fig. 1, for the transmitting end, the method includes the following steps:

s101, carrying out frequency hopping processing on the signal with the first set frame number to obtain a frequency hopping signal, and sending the frequency hopping signal to a receiving end.

And S102, receiving the target communication frequency and the target modulation coding mode from the receiving end, carrying out frequency selection processing on the signals with the second set frame number according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals, and transmitting the frequency selection transmitting signals to the receiving end.

Wherein, the transmitting end communicates with the receiving end according to a cyclic communication scheme, which includes the above steps S101 and S102. In a specific scattering communication process, the transmitting end firstly performs frequency hopping communication with the receiving end for a period of time through the step S101, then the frequency selection communication stage is switched to by using an estimation result of a channel in the frequency hopping communication process, communication is performed by using one frequency with the best channel quality or a plurality of better frequencies, namely a target communication frequency in the step S102, the frequency hopping communication is switched to the step S101 after the frequency selection communication is performed for a period of time, and the steps are repeated in a circulating manner.

In one possible implementation manner, in step S101, the frequency hopping process includes:

carrying out channel coding, channel interleaving, modulation and group hopping on the signals in sequence to obtain modulated signals;

and carrying out up-conversion on the modulation signal under the control of the frequency hopping pattern to obtain a frequency hopping signal.

In one possible implementation, the method further includes:

inserting a pilot signal when performing group hopping on a signal; the pilot signal is a CAZAC sequence.

In one possible implementation manner, the first set frame number is greater than or equal to 3; the second set frame number is more than or equal to 1; the sum of the first set frame number and the second set frame number is equal to the channel coherence time.

Wherein the channel coherence time is calculated with a correlation coefficient equal to 0.5. If the total time of frequency hopping and frequency selection is longer than the channel coherence time, the channel will change greatly, and the optimal channel selected in the frequency hopping stage will change greatly when used in the frequency selection stage, which will affect the communication effect.

In one possible implementation, the frequency hopping process employs 8 frequency hops.

In one possible implementation, the decibel difference between the target modulation coding mode and the coding mode of the frequency hopping signal is 3-4 decibels. Optionally, the difference is 3 db, 3.5 db, or 4 db.

Under the condition of 8-frequency selection, the gain of frequency-selection communication is theoretically 4.3 decibels higher than that of frequency-hopping communication, and therefore the communication speed can be improved by selecting the target modulation and coding mode according to the decibel difference between the target modulation and coding mode and the modulation and coding mode of the frequency-hopping signal being 3-4 decibels.

The scatter communication method provided by the embodiment of the invention realizes the communication between the sending end and the receiving end through a cyclic communication scheme, the sending end performs frequency hopping processing on the signal with the first set frame number to obtain a frequency hopping signal, and the frequency hopping signal is sent to the receiving end, so that the target communication frequency and the target modulation coding mode are determined according to the signal with the first set frame number. And after receiving the target communication frequency and the target modulation coding mode from the receiving end, the sending end carries out frequency selection processing on the signals with the second set frame number according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals and sends the frequency selection transmitting signals to the receiving end. The transmitting signal is communicated according to the target communication frequency and the target modulation coding mode, so that the communication rate and the communication quality are improved. The scheme of the invention realizes communication only by optimizing the frequency hopping scattering communication control protocol, and improves the data transmission rate and the communication performance.

Fig. 2 is a flowchart illustrating a scatter communication method according to another embodiment of the present invention. As shown in fig. 2, for the receiving end, the method includes the following steps:

s201, receiving a frequency hopping signal of a first set frame number from a sending end, and obtaining a channel evaluation signal according to the frequency hopping signal.

And S202, determining a target communication frequency and a target modulation and coding mode according to the channel evaluation signal.

And S203, transmitting the target communication frequency and the target modulation and coding mode to the transmitting end.

S204, receiving the frequency-selecting transmitting signal with the second set frame number from the receiving end.

In one possible implementation manner, in step S201, obtaining a channel estimation signal according to a frequency hopping signal includes:

carrying out down-conversion and debounce on the frequency hopping signal in sequence to obtain a channel evaluation signal; the channel estimation signal is a CAZAC sequence. The CAZAC sequence has the constant enveloping (amplitude) characteristic and high effective transmitting power, and meanwhile, the CAZAC sequence has the zero autocorrelation characteristic and the channel estimation is more accurate.

In one possible implementation, determining the target communication frequency and the target modulation and coding scheme according to the channel estimation signal includes:

determining a signal-to-noise ratio according to the channel estimation signal;

and determining a target communication frequency according to the signal-to-noise ratio meeting the set condition, and determining a target modulation coding mode based on the corresponding relation between the signal-to-noise ratio and the modulation coding mode.

The set condition is that the signal-to-noise ratio is larger than a set value, or the signal-to-noise ratio with the largest value. When the set condition is that the signal-to-noise ratio is larger than the set value, the corresponding communication frequency is one or more. When the set condition is the signal-to-noise ratio with the maximum value, the corresponding communication frequency is one.

Determining a target communication frequency according to the signal-to-noise ratio meeting the set condition, including:

determining the communication frequency corresponding to the maximum signal-to-noise ratio as a target communication frequency; alternatively, the first and second electrodes may be,

and determining the communication frequency corresponding to one or more signal-to-noise ratios larger than the set value as the target frequency.

Determining a target modulation coding mode based on the corresponding relation between the signal-to-noise ratio and the modulation coding mode, comprising:

determining a modulation coding mode corresponding to the maximum signal-to-noise ratio as a target modulation coding mode; alternatively, the first and second electrodes may be,

and determining the modulation coding mode corresponding to the signal-to-noise ratio larger than the set value as a target modulation coding mode.

The signal receiving device stores a signal-to-noise ratio threshold table corresponding to different modulation modes and coding modes in advance. The error rate required by communication can be ensured by inquiring and obtaining the corresponding modulation coding mode according to the channel quality, namely the measured signal-to-noise ratio. High code rate and high order modulation are used when channel quality is good, and low code rate and low order modulation are used when channel quality is poor.

The signal-to-noise ratio generally represents the strength of the received signal level, the signal-to-noise ratio is high, which indicates that the received signal is strong, under the condition that the bandwidth is not changed, the data transmission rate can be properly improved under the condition of ensuring a certain bit error rate and user experience, and the improvement of the data transmission rate is realized by improving the modulation order and the coding rate; on the contrary, the low signal-to-noise ratio indicates that the received signal is weak, and under the condition of not changing the bandwidth, the data transmission rate can be properly reduced under the condition of ensuring a certain bit error rate and user experience, which is realized by reducing the modulation order and the coding rate.

Under the frequency hopping communication, the condition of some hopping channels is good, the condition of some hopping channels is poor, and the total communication effect of the frequency hopping communication is a compromise communication effect which gives consideration to both good channels and poor channels. The frequency selection is to change the difference removal into good, so that the channel condition of frequency-selecting communication is better than that of frequency-hopping communication, and the communication rate can be improved by increasing the modulation order and the coding rate.

In one possible implementation manner, after sequentially performing down-conversion and de-hopping on the frequency hopping signal, the method further includes:

and demodulating and equalizing the frequency hopping signal after the frequency hopping is carried out, and carrying out channel de-interleaving and channel decoding operation to obtain an output signal.

The scatter communication method provided by the embodiment of the invention realizes the communication between the sending end and the receiving end through a cyclic communication scheme, the sending end performs frequency hopping processing on the signal with the first set frame number to obtain a frequency hopping signal, and the frequency hopping signal is sent to the receiving end, so that the target communication frequency and the target modulation coding mode are determined according to the signal with the first set frame number. And after receiving the target communication frequency and the target modulation coding mode from the receiving end, the sending end carries out frequency selection processing on the signals with the second set frame number according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals and sends the frequency selection transmitting signals to the receiving end. The transmitting signal is communicated according to the target communication frequency and the target modulation coding mode, so that the communication rate and the communication quality are improved. The scheme of the invention realizes communication only by optimizing the frequency hopping scattering communication control protocol, and improves the data transmission rate and the communication performance.

In an embodiment, a communication scheme between a transmitting end and a receiving end is described by taking a first set frame number of 5 and a second set frame number of 15 as an example, and the method includes the following steps:

the sending end carries out channel coding, channel interleaving, modulation and group hopping on the data of 1 to 5 frames in sequence to obtain a modulation signal, then carries out up-conversion to the transmitting frequency under the control of a frequency hopping pattern, and then sends the modulation signal to a scattering channel.

The receiving end synchronizes the frequency hopping pattern to the communication frequency corresponding to the transmitting end through down-conversion of the received 1 to 3 frame data, and then sends the demodulated data to a channel decoder for decoding after sequentially going through debounce, demodulation, equalization and deinterleave.

And the receiving end performs channel quality evaluation on the communication frequencies of the 1 st to 3 rd frequency hopping time slots before the 4 th frequency hopping time slot starts, selects the optimal communication frequency, and determines which modulation and coding mode is used for communication according to the channel quality. Alternatively, the detection and quality assessment of the channel is performed using Zadoff-Chu sequences in CAZAC sequences. And the receiving end feeds back the optimal communication frequency fs and the corresponding modulation coding mode to the transmitting end in the 4 th frequency hopping time slot.

And the transmitting end analyzes the fed back optimal communication frequency and the corresponding modulation coding mode from the received signal at the 5 th frequency hopping time slot.

The sending end and the receiving end carry out frequency selection communication of 15 time slots, and the method comprises the following steps: and from the 6 th time slot to the 20 th time slot, the transmitting end and the receiving end carry out frequency selection communication of 15 time slots on the optimal communication frequency according to a specified modulation coding mode.

And the transmitting end and the receiving end switch into the frequency hopping communication mode again from the 21 st time slot to the 25 th time slot, and switch into the frequency selection communication mode from the 26 th time slot to the 40 th time slot, and the operation is repeated in a cycle.

Wherein, 8 frequency hopping is adopted in the frequency hopping communication mode. The time slot length between two adjacent frames of data is 2ms, the time length of each hop is 0.25ms, the duration of the frequency hopping communication mode is 10ms, and the duration of the frequency selection communication mode is 30 ms.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.

Fig. 3 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present invention, which only shows a part related to the embodiment of the present invention for convenience of description, and the details are as follows:

as shown in fig. 3, the signal transmitting apparatus includes a frequency hopping processing module 301, a first signal processing module 302, and a frequency selection processing module 303.

The frequency hopping processing module 301 is configured to perform frequency hopping processing on the signal with the first set frame number to obtain a frequency hopping signal.

The first signal processing module 302 is configured to send a frequency hopping signal to a receiving end, and receive a target communication frequency and a target modulation and coding scheme from the receiving end;

the frequency selection processing module 303 is configured to perform frequency selection processing on the signals with the second set frame number by using the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals;

the first signal processing module 302 is further configured to send the frequency-selective transmission signal to a receiving end.

The signal transmitting device provided in the embodiment of the present invention performs frequency hopping processing on the signal with the first set frame number through the frequency hopping processing module to obtain a frequency hopping signal, and sends the frequency hopping signal to the receiving end through the first signal processing module, so that the receiving end determines a target communication frequency and a target modulation and coding mode according to the signal with the first set frame number. After receiving the target communication frequency and the target modulation coding mode from the receiving end, the signal transmitting device performs frequency selection processing on the signals with the second set frame number through the frequency selection processing module according to the target communication frequency and the target modulation coding mode to obtain frequency selection transmitting signals, and sends the frequency selection transmitting signals to the receiving end through the first signal processing module. The transmitting signal is communicated according to the target communication frequency and the target modulation coding mode, so that the communication rate and the communication quality are improved. The scheme of the invention realizes communication only by optimizing the frequency hopping scattering communication control protocol, and improves the data transmission rate and the communication performance.

Fig. 4 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present invention, which includes a second signal processing module 401, a channel estimation signal obtaining module 402, and a channel estimation module 403.

The second signal processing module 401 is configured to receive a frequency hopping signal with a first set frame number from the transmitting end.

A channel estimation signal obtaining module 402, configured to obtain a channel estimation signal according to the frequency hopping signal.

And a channel estimation module 403, configured to determine a target communication frequency and a target modulation and coding scheme according to the channel estimation signal.

The second signal processing module 401 is further configured to send the target communication frequency and the target modulation and coding scheme to the sending end, and receive the frequency-selective transmission signal with the second set frame number from the receiving end.

The signal receiving apparatus provided in the embodiment of the present invention receives, by using the second signal processing module, a frequency hopping signal with a first set frame number from the sending end, analyzes, by using the channel estimation signal obtaining module, the channel estimation signal from the frequency hopping channel, performs channel estimation by using the channel estimation module to determine a target communication frequency and a target modulation and coding scheme, and further feeds back the target communication frequency and the target modulation and coding scheme to the sending end by using the second signal processing module, and receives the frequency-selective transmission signal according to the target communication frequency and the target modulation and coding scheme. The scheme of the invention realizes communication only by optimizing the frequency hopping scattering communication control protocol, and improves the data transmission rate and the communication performance.

Fig. 5 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present invention, as shown in the figure, including: a channel coding module 501, a channel interleaving module 502, a modulation module 503, a group hopping module 504, an up-conversion module 505 and a modulation and coding mode control module 506.

The channel coding module 501, the channel interleaving module 502 and the modulation module 503 are configured to perform channel coding, channel interleaving, modulation and group hopping on the signal in sequence to obtain a modulated signal.

The up-conversion module 505 is configured to up-convert the modulation signal under the control of the frequency hopping pattern to obtain a frequency hopping signal.

The modulation and coding scheme control module 506 is configured to receive a target communication frequency and a target modulation and coding scheme from a receiving end, and control the channel coding module 501 and the modulation module 503 to complete coding and modulation of a signal according to the target modulation and coding scheme in a frequency-selective communication phase.

Fig. 6 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present invention, as shown in the figure, including: a down-conversion module 601, a de-hopping module 602, a demodulation and equalization module 603, a channel de-interleaving module 604, a channel decoding module 605, a channel estimation module 606, and a channel quality assessment and decision module 607.

The down-conversion module 601 synchronizes the frequency hopping pattern to a communication frequency corresponding to the transmitting end through down-conversion.

The debounce module 602 is configured to parse the received frequency hopping signal to obtain a channel estimation signal and a communication signal to be demodulated for transmitting information.

The channel estimation module 606 and the channel quality assessment and decision module 607 are configured to perform channel quality assessment according to the channel assessment signal, and obtain a target communication frequency and a target modulation and coding scheme based on a result of the channel quality assessment.

The signal receiving device pre-stores signal-to-noise ratio threshold tables corresponding to different modulation modes and coding modes, and the channel estimation module 606 analyzes the channel estimation signal to obtain the signal-to-noise ratio. The channel quality evaluation and decision module 607 queries the measured snr to obtain the corresponding modulation and coding scheme, and determines the target communication frequency and the target modulation and coding scheme.

The embodiment of the invention also provides a scattering communication system which comprises the signal transmitting device provided by any embodiment and the signal receiving device provided by any embodiment.

Fig. 7 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 7, the terminal 7 of this embodiment includes: a processor 70, a memory 71 and a computer program 72 stored in said memory 71 and executable on said processor 70. The processor 70 implements the steps in the various embodiments of the scatter communication method described above when executing the computer program 72, such as the steps S101 to S202 shown in fig. 1, or the steps S201 to S204 shown in fig. 2. The processor 70, when executing the computer program 72, implements the functions of the modules/units in the device embodiments described above, such as the functions of the modules/units 301 to 303 shown in fig. 3 or the functions of the modules/units 401 to 403 shown in fig. 4.

Illustratively, the computer program 72 may be partitioned into one or more modules/units that are stored in the memory 71 and executed by the processor 70 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 72 in the terminal 7. For example, the computer program 72 may be divided into the functions of the modules/units 301 to 303 shown in fig. 3, or the functions of the modules/units 401 to 403 shown in fig. 4.

The terminal 7 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal 7 may include, but is not limited to, a processor 70, a memory 71. It will be appreciated by those skilled in the art that fig. 7 is only an example of a terminal 7 and does not constitute a limitation of the terminal 7, and that it may comprise more or less components than those shown, or some components may be combined, or different components, for example the terminal may further comprise input output devices, network access devices, buses, etc.

The Processor 70 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 71 may be an internal storage unit of the terminal 7, such as a hard disk or a memory of the terminal 7. The memory 71 may also be an external storage device of the terminal 7, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 7. Further, the memory 71 may also include both an internal storage unit and an external storage device of the terminal 7. The memory 71 is used for storing the computer program and other programs and data required by the terminal. The memory 71 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the scatter communication method may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.