阅读说明：本技术 一种面向5g nr的转发干扰方法及系统 (5G NR-oriented forwarding interference method and system ) 是由 王中方 翟留群 李晓娜 付婧雯 王文 魏冬 于 2020-05-22 设计创作，主要内容包括：本发明提供一种面向5G NR的转发干扰方法及系统,该方法包括：依次接收p个频段数为n的5G无线信号,经模数转换得到p个n频段接收数据；将第q个n频段接收数据的第i频段数据依次写入存储单元中,覆盖存储单元中第q-1个全频段接收数据的第i频段数据,1≤q≤p,1≤i≤n；根据延迟量,计算存储单元中第i频段数据的读取地址,读取存储单元中所有频段数据,得到一待发送数据,对各待发送数据进行数模转换,将各频段干扰信号发送至空中。本发明实现对高速率、低时延5G NR的信号的实时处理,算法复杂度低,干扰效率更高,且不影响其他用户的正常使用,并且所需的干信比更低,发射功率更小,满足环保、节能的需求。(The invention provides a forwarding interference method and a forwarding interference system facing to 5G NR, wherein the method comprises the following steps: sequentially receiving p 5G wireless signals with the frequency band number of n, and obtaining p n frequency band receiving data through analog-to-digital conversion; sequentially writing ith frequency band data of the qth n-frequency band received data into a storage unit, covering the ith frequency band data of the qth-1 full-frequency band received data in the storage unit, wherein q is more than or equal to 1 and less than or equal to p, and i is more than or equal to 1 and less than or equal to n; and according to the delay amount, calculating a reading address of the ith frequency band data in the storage unit, reading all frequency band data in the storage unit to obtain data to be transmitted, performing digital-to-analog conversion on each data to be transmitted, and transmitting each frequency band interference signal to the air. The invention realizes the real-time processing of the 5G NR signals with high speed and low time delay, has low algorithm complexity, higher interference efficiency, no influence on the normal use of other users, lower required interference-signal ratio and smaller transmitting power, and meets the requirements of environmental protection and energy saving.)

1. A forwarding interference method facing to 5G NR comprises the following steps:

1) sequentially receiving p 5G wireless signals with the frequency band number of n, and obtaining p n frequency band receiving data through analog-to-digital conversion;

2) sequentially writing ith frequency band data of the qth n-frequency band received data into a storage unit, covering the ith frequency band data of the qth-1 full-frequency band received data in the storage unit, wherein q is more than or equal to 1 and less than or equal to p, and i is more than or equal to 1 and less than or equal to n;

3) according to the delay amount, calculating a reading address of the ith frequency band data in the storage unit, and reading all frequency band data in the storage unit to obtain data to be sent;

4) and D/A conversion is carried out on each data to be transmitted, and the interference signals of each frequency band are transmitted to the air.

2. The method of claim 1, wherein the full band 5G wireless signal prior to analog-to-digital conversion is pre-processed by:

1) mixing frequency signals of all frequency bands of the 5G wireless signals;

2) filtering and amplifying the mixed signals.

3. The method of claim 1 wherein the memory cell integrates one or more double rate synchronous dynamic random access memories.

4. The method of claim 1, wherein receiving and transmitting are alternated; the total time T of receiving the 5G wireless signal with the number of n bands and transmitting the n i-th band interference signals is n × T1+ n × T2, T1 is the time of receiving one-band data, and T2 is the time of transmitting one-band interference signals.

5. The method of claim 4, wherein all frequency band data in the memory unit is read by:

1) reading the frequency band data backwards from the reading address of the ith frequency band data;

2) after reading the subsequent frequency band data, circularly reading the frequency band data from the initial address;

3) when the receiving time window is reached, the reading is stopped.

6. The method of claim 1, wherein the delay amount is obtained by:

1) receiving a frequency band sample signal of the 5G wireless signal, and obtaining sample receiving data through analog-to-digital conversion;

2) writing the sample receiving data into a storage unit and reading the sample receiving data to obtain sample data to be sent;

3) and calculating the delay amount of the sample interference signal obtained by digital-to-analog conversion and the 5G existing network signal in the same frame in the time domain.

7. The method of claim 1, wherein each interference signal after digital-to-analog conversion is processed by:

1) mixing the interference signals;

2) and filtering and amplifying the mixed interference signals.

8. The method of claim 1, wherein the power of the i-th band interference signal is greater than the i-band power of the existing network 5G wireless signal.

9. A 5G NR oriented forward interference system comprising:

1) the receiving antenna module is used for receiving p 5G wireless signals with the frequency band number of n;

2) the broadband radio frequency transceiving module is used for carrying out analog-to-digital conversion on the 5G wireless signals with the number of p frequency bands being n to obtain p n frequency band receiving data and carrying out digital-to-analog conversion on each transmitting data to obtain each interference signal;

3) the storage module is used for storing data of each frequency band;

4) the base band processing module is used for sequentially writing ith frequency band data of the qth n-frequency band received data into the storage unit, covering the ith frequency band data of the q-1 th full-frequency band received data in the storage unit, wherein q is more than or equal to 1 and less than or equal to p, i is more than or equal to 1 and less than or equal to n, calculating a reading address of the ith frequency band data according to the delay amount, and reading all frequency band data in the storage unit to obtain data to be sent;

5) and the transmitting antenna module is used for transmitting each interference signal.

10. The system of claim 9, wherein the baseband processing module comprises:

1) the frequency sweep control submodule is used for configuring the receiving parameters of the broadband radio frequency transceiving module in turn;

2) the read-write state submodule is used for interacting with the data of the storage module;

3) the dynamic adjustment submodule is used for calculating the delay amount;

4) and the gain control submodule is used for adjusting the power of the interference signal.

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a forwarding interference method and system for 5G NR.

Background

Compared with the prior mobile communication technologies, the 5G, fifth generation mobile communication technology greatly improves the communication rate of users, increases the connection density, reduces the end-to-end time delay and enhances the mobility of the receiving and transmitting parties. While 5G brings convenience to production and life, a plurality of potential safety hazards also exist, and especially in important areas such as secret-related meeting places of government and military departments, the problem of secret divulgence caused by illegal use of mobile terminals is increasingly prominent. The mobile communication link interference technology aiming at the key area blocks the communication between a user and a public network by transmitting a specific shielding signal so as to achieve the purpose of security and confidentiality of the key area.

The existing mobile communication link interference scheme mostly adopts suppression type interference, namely, a high-power frequency sweeping signal is sent on all mobile communication frequency bands to suppress wireless signals of the existing network and cut off the communication between a mobile terminal and a public network. The scheme mainly has the following problems: under the complex wireless environment of multiple hybrid systems, the effective interference radius is too small, and the interference efficiency is not high; and the uplink is interfered, and the normal use of users outside the control area is influenced. In addition, the interference-to-signal ratio of the pressing type interference is high, the power of an interference signal is high, and damage to human health is easily caused.

Although chinese patent application CN109889301A discloses a shielding device for 5G green wireless signals and a shielding method thereof, which uses PSS interference sequence, SSS interference sequence and PBCH DMRS interference sequence to solve the above problems to some extent, the algorithm is complex and multiple interference sequences need to be generated. Therefore, a simple, efficient and low-power-consumption 5G signal shielding method is urgently needed.

Disclosure of Invention

In order to solve the above problems, the present invention provides a method and a system for forwarding interference for 5G NR (New Radio New air interface), which implement forwarding interference by acquiring and storing existing network signals, i.e. copy received signals, including delay, scaling and other processing, and then transmit out a spoofed mobile terminal, so that the spoofed mobile terminal cannot establish a connection with a real base station, thereby achieving the purpose of interfering a mobile communication link.

A forwarding interference method facing to 5G NR comprises the following steps:

1) sequentially receiving p 5G wireless signals with the frequency band number of n, and obtaining p n frequency band receiving data through analog-to-digital conversion;

2) sequentially writing ith frequency band data of the qth n-frequency band received data into a storage unit, covering the ith frequency band data of the qth-1 full-frequency band received data in the storage unit, wherein q is more than or equal to 1 and less than or equal to p, and i is more than or equal to 1 and less than or equal to n;

3) according to the delay amount, calculating a reading address of the ith frequency band data in the storage unit, and reading all frequency band data in the storage unit to obtain data to be sent;

4) and D/A conversion is carried out on each data to be transmitted, and the interference signals of each frequency band are transmitted to the air.

Further, the full-band 5G wireless signal before analog-to-digital conversion is preprocessed by the following steps:

1) mixing frequency signals of all frequency bands of the 5G wireless signals;

2) filtering and amplifying the mixed signals.

Further, the memory unit integrates one or more double rate synchronous dynamic random access memories.

Further, reception alternates with transmission; the total time T of receiving the 5G wireless signal with the number of n bands and transmitting the n i-th band interference signals is n × T1+ n × T2, T1 is the time of receiving one-band data, and T2 is the time of transmitting one-band interference signals.

Further, reading all frequency band data in the storage unit by the following steps:

1) reading the frequency band data backwards from the reading address of the ith frequency band data;

2) after reading the subsequent frequency band data, circularly reading the frequency band data from the initial address;

3) when the receiving time window is reached, the reading is stopped.

Further, the delay amount is obtained by:

1) receiving a frequency band sample signal of the 5G wireless signal, and obtaining sample receiving data through analog-to-digital conversion;

2) writing the sample receiving data into a storage unit and reading the sample receiving data to obtain sample data to be sent;

3) and calculating the delay amount of the sample interference signal obtained by digital-to-analog conversion and the 5G existing network signal in the same frame in the time domain.

Further, each interference signal after digital-to-analog conversion is processed by the following steps:

1) mixing the interference signals;

2) and filtering and amplifying the mixed interference signals.

Furthermore, the power of the i-th frequency band interference signal is greater than the power of the i-frequency band of the existing network 5G wireless signal.

A 5G NR oriented forward interference system comprising:

1) the receiving antenna module is used for receiving p 5G wireless signals with the frequency band number of n;

2) the broadband radio frequency transceiving module is used for carrying out analog-to-digital conversion on the 5G wireless signals with the number of p frequency bands being n to obtain p n frequency band receiving data and carrying out digital-to-analog conversion on each transmitting data to obtain each interference signal;

3) the storage module is used for storing data of each frequency band;

4) the base band processing module is used for sequentially writing ith frequency band data of the qth n-frequency band received data into the storage unit, covering the ith frequency band data of the q-1 th full-frequency band received data in the storage unit, wherein q is more than or equal to 1 and less than or equal to p, i is more than or equal to 1 and less than or equal to n, calculating a reading address of the ith frequency band data according to the delay amount, and reading all frequency band data in the storage unit to obtain data to be sent;

5) and the transmitting antenna module is used for transmitting each interference signal.

Further, the baseband processing module includes:

1) the frequency sweep control submodule is used for configuring the receiving parameters of the broadband radio frequency transceiving module in turn;

2) the read-write state submodule is used for interacting with the data of the storage module;

3) the dynamic adjustment submodule is used for calculating the delay amount;

4) and the gain control submodule is used for adjusting the power of the interference signal.

Compared with the prior art, the invention has the advantages that:

(1) the broadband radio frequency transceiver and the large-capacity storage unit are used for realizing the real-time processing of the high-speed and low-time-delay 5G NR signals.

(2) Different modulation patterns do not need to be distinguished, the algorithm complexity is low, and the realization is simple.

(3) The interference efficiency is higher, and the normal use of other users is not influenced. After the electromagnetic environment in the shielding region is analyzed, a specific forwarding interference signal is transmitted, and the influence on normal communication outside the region is small.

(4) Compared with noise suppression type interference, the invention has the advantages of lower required interference-signal ratio and lower transmitting power, and meets the requirements of environmental protection and energy saving.

Drawings

FIG. 1 is a block diagram of the system of the present invention.

Fig. 2 is a schematic diagram of the transceiving switching of the broadband rf transceiving module.

Fig. 3 is a flow chart of dynamically adjusting the transmission time window of the broadband rf transceiver module.

Detailed Description

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

The invention provides a forwarding interference method and system facing to 5G NR, and figure 1 is a schematic diagram of system composition.

The invention relates to a forwarding interference method facing to 5G NR, which comprises the following steps:

1) receiving a full-band 5G NR wireless signal of an environment space, and obtaining a digital intermediate frequency signal after frequency mixing, filtering, amplifying and analog-to-digital conversion;

2) in a transceiving period, the processing flow is as shown in fig. 2, and receiving paths of the broadband radio frequency transceiving units are configured in turn;

3) sequentially writing the current network data of N frequency bands acquired by a plurality of receiving time windows into corresponding storage units, wherein the length (20ms) of two wireless frames is set for a single frequency band receiving time window;

4) circularly reading the signal data of the full frequency band in the storage unit in a sending time window; in order to achieve the best interference effect, the transmitted interference signal and the current network signal are aligned in a time domain in a frame mode;

because of the delay of data writing and reading, the data directly read from the initial storage address and forwarded is not frame aligned, the invention changes the first reading address of the storage unit by a dynamic adjustment method to dynamically change the sending time window to ensure that the first read data meets the requirement of frame alignment, and then circularly read from the initial storage address, as shown in fig. 3;

5) performing digital-to-analog conversion, frequency mixing, filtering and amplification on the signal to be transmitted, which is taken out from the storage unit;

6) after digital-to-analog conversion, frequency mixing, filtering and amplification are carried out on a signal to be transmitted, the signal is transmitted to the air through a transmitting antenna, and interference is implemented; in order to achieve effective interference, the power of the interfering signal should be greater than the signal strength of the frequency band in the environmental space.

A 5G NR oriented forward interference system, the system comprising: the device comprises a receiving antenna module, a transmitting antenna module, a broadband radio frequency transceiving module, a baseband processing module and a large-capacity storage module.

The receiving antenna module is used for receiving the 5G NR signal in the electromagnetic space.

The broadband radio frequency transceiver module comprises a receiving access module and a sending access module, wherein the receiving access module integrates sub-modules such as a mixer, a filter, an amplifier, an A/D converter and the like, and carries out down-conversion, broadband filtering, amplification, A/D conversion and other processing on electromagnetic signals received by an antenna; the transmitting path module integrates sub-modules such as a mixer, a filter, an amplifier, a D/A converter and the like, and performs processing such as D/A conversion, up-conversion, broadband filtering, amplification and the like on data transmitted by the baseband processing module.

The baseband processing module finishes the storage and the forwarding of baseband digital signals and comprises a frequency sweep control sub-module, a read-write state sub-module, a gain control sub-module and a dynamic adjustment sub-module. And the sweep frequency control submodule configures the receiving parameters of the broadband radio frequency transceiving module in turn to complete the scanning control of a plurality of 5G NR frequency bands. The read-write state submodule realizes data interaction with the large-capacity storage unit and completes storage of current network data with high speed and low time delay. And the gain control submodule scales the extracted current network signal and adjusts the power of the interference signal. The dynamic adjustment submodule realizes the dynamic adjustment of the sending time window by changing the reading address of the large-capacity storage unit.

The large-capacity memory module integrates multiple DDR SDRAM (double data rate synchronous dynamic random access memory) and stores high-throughput data.

The transmit antenna is used for transmission of the interference signal.

A 5G NR oriented forward jammer, the apparatus comprising: receiving antenna, transmitting antenna, broadband radio frequency receiving and dispatching unit, baseband processing unit, large capacity memory cell:

1) the receiving antenna is used for receiving full-band 5G NR wireless signals of an environment space collected by the receiving antenna, and digital intermediate-frequency signals are obtained after frequency mixing, filtering, amplifying and analog-to-digital conversion of the broadband radio frequency transceiver;

2) the baseband processing unit integrates sub-units of frequency sweep control, a read-write state machine, gain control, dynamic adjustment and the like;

the sweep frequency control subunit is used for configuring receiving channels of the broadband radio frequency transceiving units in turn, and the read-write state machine sequentially writes the current network data of the N frequency bands acquired by the plurality of receiving time windows into the corresponding storage units; the single frequency band receiving time window is set to be the length (20ms) of two wireless frames;

the read-write state machine is used for circularly reading the signal data of the full frequency band in the storage unit in the sending time window;

in order to achieve the best interference effect, the transmitted interference signal and the current network signal are frame-aligned in the time domain. Due to the latency of data writing and reading, data directly read from the initial memory address and forwarded is not frame aligned; the dynamic adjustment subunit is used for changing the first reading address of the storage unit to dynamically change the sending time window so as to ensure that the first read data meets the requirement of frame alignment, and then circularly reads from the initial storage address;

the gain control subunit is used for scaling the data taken out by the storage unit and sending the data in each frequency band with certain power, and in order to realize effective interference, the power of an interference signal is greater than the signal intensity of the frequency band in an environmental space;

3) the broadband radio frequency transceiver is used for carrying out digital-to-analog conversion, frequency mixing, filtering and amplification on a signal to be transmitted;

4) the transmitting antenna is used for transmitting signals to the air to implement interference.

The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person skilled in the art can modify the technical solution of the present invention or substitute the same without departing from the spirit and scope of the present invention, and the scope of the present invention should be determined by the claims.