Dynamic narrowband interference avoidance method, device, storage medium and terminal suitable for broadband OFDM system

文档序号：1275712 发布日期：2020-08-25 浏览：9次中文

阅读说明：本技术 一种适用于宽带ofdm系统的动态窄带干扰规避方法、装置、存储介质及终端 (Dynamic narrowband interference avoidance method, device, storage medium and terminal suitable for broadband OFDM system ) 是由赵辉张奭张�诚于 2020-03-25 设计创作，主要内容包括：本发明公开了一种适用于宽带OFDM系统的动态窄带干扰规避方法、装置、存储介质及终端,所述方法包括：根据宽带OFDM系统和窄带干扰系统的参数,确定可能受到窄带干扰的OFDM子载波范围集合Φ、单个窄带干扰系统可能干扰到的OFDM子载波个数n；基于预设周期对所述集合Φ内的OFDM子载波噪声功率进行估计,生成噪声功率估计值集合Ω；根据所述噪声功率估计值集合Ω和参数n,判断所述集合Φ中各子载波是否存在窄带干扰；若所述集合Φ中的子载波存在窄带干扰,则主动发起信令交互过程,关闭受到干扰的子载波上的数据传输。因此,采用本申请实施例,可以提高数据传输的可靠性。(The invention discloses a dynamic narrowband interference avoiding method, a device, a storage medium and a terminal suitable for a broadband OFDM system, wherein the method comprises the following steps: determining an OFDM subcarrier range set phi which is possibly interfered by a narrow-band and the number n of OFDM subcarriers which are possibly interfered by a single narrow-band interference system according to parameters of a broadband OFDM system and the narrow-band interference system; estimating the noise power of the OFDM subcarriers in the set phi based on a preset period to generate a noise power estimation value set omega; judging whether each subcarrier in the set phi has narrow-band interference or not according to the noise power estimation value set omega and the parameter n; if the sub-carrier waves in the set phi have narrow-band interference, actively initiating a signaling interaction process and closing data transmission on the interfered sub-carrier waves. Therefore, the reliability of data transmission can be improved by adopting the embodiment of the application.)

1. A dynamic narrowband interference avoidance method suitable for a broadband OFDM system is characterized by comprising the following steps:

step 1: according to parameters of a broadband OFDM system and a narrowband interference system, determining an OFDM subcarrier range set phi possibly subjected to narrowband interference and the number n of OFDM subcarriers possibly interfered by a single narrowband interference system, wherein the parameters of the OFDM system comprise an operating spectrum and subcarrier intervals of the OFDM system, and the parameters of the narrowband interference system comprise an operating spectrum and bandwidth of the narrowband interference system;

step 2: estimating the noise power of the OFDM subcarriers in the set phi based on a preset period to generate a noise power estimation value set omega;

and step 3: judging whether each subcarrier in the set phi has narrow-band interference or not according to the noise power estimation value set omega and the parameter n;

and 4, step 4: if the sub-carrier waves in the set phi have narrow-band interference, actively initiating a signaling interaction process and closing data transmission on the interfered sub-carrier waves.

2. The method of claim 1, wherein after turning off data transmission on the interfered subcarrier, further comprising:

and when the data transmission on the interfered subcarrier is closed, continuously executing the steps 2 to 4 in the claim 1, and continuously detecting and avoiding the interference.

3. The method of claim 1, wherein the obtaining the range set Φ of OFDM subcarriers that may be subject to narrowband interference according to the parameters of the wideband OFDM system and the narrowband interfering system comprises:

calculating a subcarrier range value phi of the OFDM system corresponding to an overlapped spectrum according to the overlapping of working spectrums of the OFDM system and the narrow-band interference system, wherein the working spectrum of the narrow-band interference system refers to an approximate spectrum range where the narrow-band interference system is known in advance.

4. The method according to claim 1, wherein the calculation formula for obtaining the number n of OFDM subcarriers possibly interfered by a single narrowband interference system according to the parameters of the wideband OFDM system and the narrowband interference system is n-single narrowband interference system bandwidth/OFDM subcarrier spacing.

5. The method according to claim 1, wherein the estimation algorithm for estimating the noise power of the OFDM subcarriers in the set Φ based on the preset period comprises a pilot-based estimation algorithm, a decision feedback-based estimation algorithm, a blind estimation algorithm, and the like.

6. The method according to claim 1, wherein said determining whether there is narrowband interference in each subcarrier in the set Φ according to the set Ω of noise power estimation values and the parameter n comprises:

acquiring a maximum noise power estimation value in the noise power estimation value set omega;

acquiring a subcarrier number corresponding to the maximum noise power estimation value;

calculating and generating a noise power average value based on the noise power estimation value set omega;

and when the maximum noise power estimation value is larger than the product of the noise power average value and a threshold value Th, determining that the frequency point corresponding to the subcarrier number is interfered by a narrow-band interference system.

7. The method of claim 2, wherein the performing dynamic narrowband interference avoidance comprises detecting narrowband interference continuously according to a preset detection period, where the detection period may be one or several signaling periods.

8. A dynamic narrowband interference avoidance apparatus adapted for use in a wideband OFDM system, the apparatus comprising:

the device comprises a subcarrier parameter determining module, a narrowband interference system and a control module, wherein the subcarrier parameter determining module is used for determining an OFDM subcarrier range set phi possibly subjected to narrowband interference and the number n of OFDM subcarriers possibly interfered by a single narrowband interference system according to parameters of a broadband OFDM system and the narrowband interference system, the parameters of the OFDM system comprise an operating spectrum and a subcarrier interval of the OFDM system, and the parameters of the narrowband interference system comprise an operating spectrum and a bandwidth of the narrowband interference system;

the set generation module is used for estimating the noise power of the OFDM subcarriers in the set phi based on a preset period to generate a noise power estimation value set omega;

the interference judging module is used for judging whether the narrow-band interference exists in each subcarrier in the set phi according to the noise power estimation value set omega and the parameter n;

and the data transmission closing module is used for actively initiating a signaling interaction process and closing data transmission on the interfered subcarrier if the narrow-band interference exists in the subcarrier in the set phi.

9. A computer storage medium, characterized in that it stores a plurality of instructions adapted to be loaded by a processor and to carry out the method steps according to any one of claims 1 to 7.

10. A terminal, comprising: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the method steps of any of claims 1 to 7.

Technical Field

The invention relates to the field of digital communication, in particular to a dynamic narrowband interference avoiding method, a device, a storage medium and a terminal suitable for a broadband OFDM system.

Background

With the rapid development of the communication network scale and the number of users, the spectrum resources are more and more strained, and therefore, the scenes that the working frequency bands of different communication systems are overlapped are more and more. Generally, a narrowband communication system will affect a broadband communication system, that is, the narrowband communication system belongs to narrowband interference for the broadband communication system, and needs to avoid or suppress the narrowband interference.

For example, the global system for mobile communications (GSM) coverage of the second generation mobile communication system is very wide, and for a communication system, GSM interference may be caused if the operating frequency band overlaps with the GSM system.

There are two operating bands for GSM: GSM900 MHz band and GSM1800 band.

900MHz frequency band: the uplink (MS transmission and BTS reception) is 890MHz to 915MHz, and the downlink (downlink: BTS transmission and MS reception) is 935MHz to 960 MHz. The uplink and downlink bandwidths of the 900MHz frequency band are respectively 25MHz, the number of duplex channels is 124, the duplex interval (the uplink and downlink interval of paired channels) is 45MHz, and the single-channel bandwidth is 200 KHz.

In a 900MHz channel, the frequency range adopted by China mobile is 890-909 (uplink), and the frequency range is 95 frequency points, while China Unicom uses 909-915 (uplink), and the frequency range is 29 frequency points.

1800MHz frequency band: the uplink (MS transmission and BTS reception) is 1710MHz to 1785MHz, and the downlink (downlink: BTS transmission and MS reception) is 1805MHz to 1880 MHz. The uplink and downlink bandwidths of the 1800MHz frequency band are respectively 75MHz, the number of duplex channels is 374, the duplex interval (the uplink and downlink interval of paired channels) is 95MHz, and the single-channel bandwidth is 200 KHz.

In 1800MHz channel, the frequency range adopted by China mobile is 1710-1720 (uplink), and the frequency range used by China Unicom is 1745-1755 (uplink). Other frequency points are temporarily reserved for other purposes.

In actual planning, GSM generally uses a frequency point multiplexing scheme of a 4-base-station 3-cell (one base station is divided into 3 sectors, and a frequency multiplexing mode of 4X3 is adopted) or a 3-base-station 3-cell, and if a communication system is mainly affected by a GSM900 uplink frequency band, since the number of frequency points of the GSM900 uplink frequency band is 124, the number of frequency points affected by GSM interference in the same geographic area is 10 to 14 at most.

Because technologies such as TDMA, frequency modulation and the like are adopted in a GSM network, dynamic characteristics of GSM interference occur, namely the characteristic that the GSM interference on one frequency point shows that the GSM interference is occasionally jumped to other frequency points or jumps instantly, so that the traditional interference detection algorithm cannot be well applied to the existing communication system, and the reliability of data transmission is reduced.

Disclosure of Invention

The embodiment of the application provides a dynamic narrowband interference avoiding method, a device, a storage medium and a terminal suitable for a broadband OFDM system. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

In a first aspect, an embodiment of the present application provides a dynamic narrowband interference avoidance method applicable to a wideband OFDM system, where the method includes:

step 2: estimating the noise power of the OFDM subcarriers in the set phi based on a preset period to generate a noise power estimation value set omega;

and step 3: judging whether each subcarrier in the set phi has narrow-band interference or not according to the noise power estimation value set omega and the parameter n;

Optionally, after the turning off the data transmission on the interfered subcarrier, the method further includes:

and when the data transmission on the interfered subcarrier is closed, continuously executing the steps 2 to 4 in the claim 1, and continuously detecting and avoiding the interference.

Optionally, the obtaining, according to the parameters of the wideband OFDM system and the narrowband interference system, an OFDM subcarrier range set Φ that may be subjected to narrowband interference includes:

Optionally, the calculation formula for obtaining the number n of OFDM subcarriers possibly interfered by a single narrowband interference system according to the parameters of the wideband OFDM system and the narrowband interference system is that n is a bandwidth of the single narrowband interference system/an OFDM subcarrier interval.

Optionally, the estimation algorithm for estimating the noise power of the OFDM subcarriers in the set Φ based on the preset period includes an estimation algorithm based on a pilot frequency, an estimation algorithm based on decision feedback, a blind estimation algorithm, and the like.

Optionally, the determining whether there is narrowband interference in each subcarrier in the set Φ according to the set Ω of noise power estimation values and the parameter n includes:

acquiring a maximum noise power estimation value in the noise power estimation value set omega;

acquiring a subcarrier number corresponding to the maximum noise power estimation value;

calculating and generating a noise power average value based on the noise power estimation value set omega;

Optionally, the performing dynamic narrowband interference avoidance includes detecting the narrowband interference uninterruptedly according to a preset detection period, where the detection period may be one or several signaling periods.

In a second aspect, an embodiment of the present application provides a dynamic narrowband interference avoiding apparatus suitable for a wideband OFDM system, where the apparatus includes:

the set generation module is used for estimating the noise power of the OFDM subcarriers in the set phi based on a preset period to generate a noise power estimation value set omega;

In a third aspect, embodiments of the present application provide a computer storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform the above-mentioned method steps.

In a fourth aspect, an embodiment of the present application provides a terminal, which may include: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the above-mentioned method steps.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

in the embodiment of the application, when the method is applied to dynamic narrowband interference avoidance of a broadband OFDM system, firstly, according to parameters of the broadband OFDM system and a narrowband interference system, an OFDM subcarrier range set phi which is possibly subjected to narrowband interference and the number n of OFDM subcarriers which can be interfered by a single narrowband interference system are determined, parameters of the OFDM system comprise a working spectrum and a subcarrier interval of the OFDM system, parameters of the narrowband interference system comprise a working spectrum and a bandwidth of the narrowband interference system, then, the noise power of the OFDM subcarriers in the set phi is estimated based on a preset period to generate a noise power estimation value set omega, then, whether narrowband interference exists in each subcarrier in the set phi is judged according to the noise power estimation value set omega and the parameter n, and finally, if narrowband interference exists in the subcarrier in the set phi, a signaling interaction process is actively initiated, turning off data transmission on the sub-carriers subject to interference. In the scheme, the narrow-band interference which affects the system is dynamically detected according to the frequency spectrum characteristic of the narrow-band interference, and the sub-carrier which is interfered in the OFDM system is turned off, so that the reliability of data transmission is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic flowchart of a dynamic narrowband interference avoidance method applicable to a wideband OFDM system according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram illustrating a situation that an OFDM system is interfered by GSM according to an embodiment of the present application;

fig. 3 is a flow chart of GSM interference determination processing in an embodiment of a dynamic GSM interference avoidance method provided in the embodiment of the present application;

fig. 4 is a flowchart illustrating another dynamic narrowband interference avoidance method applicable to a wideband OFDM system according to an embodiment of the present disclosure;

fig. 5 is a schematic device diagram of a dynamic narrowband interference avoiding device suitable for a wideband OFDM system according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Up to now, with the rapid development of the communication network scale and the number of users, the spectrum resources are more and more strained, and therefore, the scenes that the working frequency bands of different communication systems are overlapped are more and more. Generally, the narrowband communication system will affect the wideband communication system, i.e. the narrowband communication system belongs to narrowband interference for the wideband communication system, thereby reducing the reliability of data transmission. Therefore, the present application provides a method, a system, a device, a storage medium and a terminal for avoiding dynamic narrowband interference, which are applicable to a wideband OFDM system, so as to solve the problems in the related art. In the technical solution provided by the present application, because the narrowband interference affecting the system is dynamically detected according to the spectrum characteristic of the narrowband interference, and the interfered subcarrier in the OFDM system is turned off, the reliability of data transmission is improved, which is described in detail with an exemplary embodiment below.

The following describes in detail a dynamic narrowband interference avoidance method applicable to a wideband OFDM system according to an embodiment of the present application with reference to fig. 1 to 4. The method may be implemented in dependence on a computer program, operable on a dynamic narrowband interference avoidance apparatus adapted for wideband OFDM systems based on a von neumann architecture. The computer program may be integrated into the application or may run as a separate tool-like application. The dynamic narrowband interference avoidance apparatus suitable for the wideband OFDM system in the embodiment of the present application may be a user terminal, including but not limited to: personal computers, tablet computers, handheld devices, in-vehicle devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and the like. The user terminals may be called different names in different networks, for example: user equipment, access terminal, subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user equipment, cellular telephone, cordless telephone, Personal Digital Assistant (PDA), terminal equipment in a 5G network or future evolution network, and the like.

Referring to fig. 1, a schematic flow chart of a dynamic narrowband interference avoidance method applicable to a wideband OFDM system is provided for an embodiment of the present application. As shown in fig. 1, the method of the embodiment of the present application may include the steps of:

s101, step 1: according to parameters of a broadband OFDM system and a narrowband interference system, determining an OFDM subcarrier range set phi possibly subjected to narrowband interference and the number n of OFDM subcarriers possibly interfered by a single narrowband interference system, wherein the parameters of the OFDM system comprise an operating spectrum and subcarrier intervals of the OFDM system, and the parameters of the narrowband interference system comprise an operating spectrum and bandwidth of the narrowband interference system;

in the embodiment of the invention, the narrow-band interference system is a GSM system, and the bandwidth of a single GSM frequency point is 200 KHz; the OFDM system is a wideband communication system with a subcarrier spacing of 62.5 KHz.

Generally, in an OFDM communication system, if a part of frequency bands of subcarriers of the OFDM system overlaps with a frequency band of another narrowband communication system, the OFDM subcarriers may be interfered by the narrowband communication system, and the narrowband interference may show a characteristic of sometimes not or instantly jumping to other frequency bands, which results in that a conventional interference detection algorithm is not well applicable to an existing communication system. The OFDM system uses several independent sub-carriers orthogonal to each other to transmit data, how to determine whether or not to be interfered by a narrow band, and find the interfered sub-carriers.

In the embodiment of the application, according to parameters of a broadband OFDM system and a narrowband interference system, determining a range set phi of OFDM subcarriers possibly subjected to narrowband interference, and the number n of OFDM subcarriers possibly interfered by a single narrowband interference system, wherein the parameters of the OFDM system comprise the operating frequency and the subcarrier spacing of the OFDM system, and the parameters of the narrowband interference system comprise the operating frequency and the bandwidth of the narrowband interference system.

In a possible implementation manner, according to the operating frequency bands of the OFDM system and the GSM system, an OFDM subcarrier range set Φ 0 which may be subjected to narrowband interference is determined, the size of the set Φ 0 is set to L, and the number n of OFDM subcarriers which may be interfered by a single narrowband interference system is determined to be 200/62.5 ≈ 4. The interference avoidance module sets a global array GSM _ flag with the length of L, each bit represents whether GSM interference exists in a subcarrier, 1 represents no interference, and the GSM _ flag vector is initialized to be all 1;

for example, as shown in fig. 1, in the case of the narrowband interference experienced by the OFDM communication system shown in fig. 1, it is determined that the communication system is mainly interfered by frequency bands f 1-f 2 of the narrowband interference system, and one narrowband interference system may affect the number of OFDM subcarriers, where the number n of OFDM subcarriers is Δ f1/Δ f2, where Δ f1 is the bandwidth of a single narrowband interference system, and Δ f2 is the subcarrier spacing of the OFDM system.

S102, step 2: estimating the noise power of the OFDM subcarriers in the set phi based on a preset period to generate a noise power estimation value set omega;

the estimation of the noise power of the sub-carrier may include various common algorithms, such as a pilot-based estimation algorithm, a decision feedback-based estimation algorithm, a blind estimation algorithm, and the like.

In a possible implementation manner, the subcarrier noise power in the estimation set Φ 0 is estimated, and the interference avoidance module is read to generate a noise power estimation value set Ω.

S103, step 3: judging whether each subcarrier in the set phi has narrow-band interference or not according to the noise power estimation value set omega and the parameter n;

in this embodiment of the present application, when determining whether there is interference, a maximum value nPeak of noise power in the set Ω and a number nPos of a corresponding subcarrier may be found, and an average value nMean of noise power in a neighborhood of nPos is calculated, where a neighborhood of nPos is a set of subcarriers near the nPos subcarrier but not including n subcarriers around the nPos subcarrier, and n is a parameter in step S101, and if nPeak is greater than a product of the average value nMean of noise power and a threshold Th, it is determined that both the frequency point and the subcarriers in the neighborhood of the frequency point are subjected to narrowband interference.

In a possible implementation mode, firstly, the maximum value nPeak of the noise power of all subcarriers with GSM _ flag equal to 1 and the number nPos of the corresponding subcarriers are searched, then the average value P of the noise power in the neighborhood of nPeak is calculated, finally threshold comparison is carried out, if nPeak is > (the product of the average value and the threshold value Th), the subcarriers are considered to have interference such as GSM and the like, GSM _ flag corresponding to n subcarriers near the nPos is set to zero, namely the subcarriers near the nPos are closed, and the system maintenance is actively initiated; and if the nPeak does not meet the threshold condition, continuing to detect next time.

S104, step 4: if the sub-carrier waves in the set phi have narrow-band interference, actively initiating a signaling interaction process and closing data transmission on the interfered sub-carrier waves.

In a possible implementation manner, when detecting GSM interference based on step S103, actively initiating a signaling interaction process, closing a subcarrier with GSM _ flag of 0, and after the closing is successful, continuing to execute steps S102 to S104 to avoid narrowband interference such as GSM.

In the embodiment of the present application, in step S101, the GSM _ flag needs to be initialized, and an aging time may also be set, for example, a new initialization is performed every hour, so that according to the feature of randomization of GSM interference frequency points, subcarriers which are no longer interfered by GSM are released, and the utilization rate of the system frequency band is ensured.

In this embodiment of the present application, a multiple-monitoring mechanism may be set, in step S101, the GSM _ flag may be initialized to be full n, when a certain subcarrier monitors GSM interference once, only the GSM _ flag of the subcarrier is reduced by 1, and is reduced to 0 at minimum, and when the GSM _ flag of the subcarrier is 0, the subcarrier is closed, and active maintenance is triggered.

In this embodiment, the threshold Th in step S103 may be determined according to the actual situation of the system.

For example, as shown in fig. 3, fig. 3 is a flow chart of GSM interference determination processing of a dynamic GSM interference avoidance method provided in the embodiment of the present application, first, a global variable GSM _ flag is initialized to all 1(01 vectors, N bits in total), a subcarrier noise power estimation value is read, then, a noise maximum power nPeak with GSM _ flag being 1 and a corresponding subcarrier position nPos are found, if nPeak is greater than an average value of domain noise multiplied by Th, it is determined that GSM _ flag corresponding to N subcarriers near nPos is set to zero, if new interference is detected, a signaling interaction process is actively initiated, the interfered subcarrier is closed, and finally, when closed, it returns to continuously read the subcarrier noise power estimation value for re-determination.

In the embodiment of the application, when the method is applied to dynamic narrowband interference avoidance of a broadband OFDM system, firstly, according to parameters of the broadband OFDM system and a narrowband interference system, an OFDM subcarrier range set phi which is possibly subjected to narrowband interference and the number n of OFDM subcarriers which can be interfered by a single narrowband interference system are determined, parameters of the OFDM system comprise a working spectrum and a subcarrier interval of the OFDM system, parameters of the narrowband interference system comprise a working spectrum and a bandwidth of the narrowband interference system, then, the noise power of the OFDM subcarriers in the set phi is estimated based on a preset period to generate a noise power estimation value set omega, then, whether narrowband interference exists in each subcarrier in the set phi is judged according to the noise power estimation value set omega and the parameter n, and finally, if narrowband interference exists in the subcarrier in the set phi, a signaling interaction process is actively initiated, turning off data transmission on the sub-carriers subject to interference. In the scheme, the narrow-band interference which affects the system is dynamically detected according to the frequency spectrum characteristic of the narrow-band interference, and the sub-carrier which is interfered in the OFDM system is turned off, so that the reliability of data transmission is improved.

Please refer to fig. 4, which is a flowchart illustrating a dynamic narrowband interference avoidance method based on a method suitable for a wideband OFDM system according to an embodiment of the present disclosure. The dynamic narrowband interference avoidance method based on the broadband OFDM system can comprise the following steps:

s201, according to parameters of a broadband OFDM system and a narrowband interference system, determining a range set phi of OFDM subcarriers possibly subjected to narrowband interference and the number n of OFDM subcarriers possibly interfered by a single narrowband interference system, wherein the parameters of the OFDM system comprise an operating spectrum and a subcarrier interval of the OFDM system, and the parameters of the narrowband interference system comprise an operating spectrum and a bandwidth of the narrowband interference system;

s202, calculating a subcarrier range value phi of the OFDM system corresponding to an overlapped frequency spectrum according to the overlapping of the working frequency spectrums of the OFDM system and the narrow-band interference system;

s203, acquiring a maximum noise power estimation value in the noise power estimation value set omega;

s204, acquiring a subcarrier number corresponding to the maximum noise power estimation value;

s205, calculating and generating a noise power average value based on the noise power estimation value set omega;

s206, when the maximum noise power estimated value is larger than the product of the noise power average value and a threshold value Th, determining that the frequency point corresponding to the subcarrier number is interfered by a narrow-band interference system;

s207, if the sub-carrier in the set phi has narrow-band interference, actively initiating a signaling interaction process, and closing data transmission on the interfered sub-carrier;

and S208, after the data transmission on the interfered subcarrier is closed, returning to the step S202 to continue executing, and continuously detecting and avoiding the interference.

The following are embodiments of the apparatus of the present invention that may be used to perform embodiments of the method of the present invention. For details which are not disclosed in the embodiments of the apparatus of the present invention, reference is made to the embodiments of the method of the present invention.

Referring to fig. 5, a schematic structural diagram of a dynamic narrowband interference avoiding apparatus suitable for a wideband OFDM system according to an exemplary embodiment of the present invention is shown. The dynamic narrowband interference avoiding device suitable for the broadband OFDM system can be realized into all or part of a terminal through software, hardware or the combination of the software and the hardware. The device 1 comprises a subcarrier parameter determining module 10, a set generating module 20, an interference judging module 30 and a data transmission closing module 40.

A sub-carrier parameter determining module 10, configured to determine, according to parameters of a wideband OFDM system and a narrowband interference system, a range set Φ of OFDM sub-carriers that may be subjected to narrowband interference, and a number n of OFDM sub-carriers that may be interfered by a single narrowband interference system, where the parameters of the OFDM system include an operating spectrum and a sub-carrier interval of the OFDM system, and the parameters of the narrowband interference system include an operating spectrum and a bandwidth of the narrowband interference system;

a set generating module 20, configured to estimate noise power of OFDM subcarriers in the set Φ based on a preset period, and generate a noise power estimation value set Ω;

an interference judging module 30, configured to judge whether a narrowband interference exists in each subcarrier in the set Φ according to the noise power estimation value set Ω and the parameter n;

and a data transmission closing module 40, configured to actively initiate a signaling interaction process and close data transmission on the interfered subcarriers if the subcarriers in the set Φ have narrowband interference.

It should be noted that, when the dynamic narrowband interference avoiding device applicable to the wideband OFDM system provided in the foregoing embodiment executes the dynamic narrowband interference avoiding method applicable to the wideband OFDM system, only the division of the functional modules is illustrated, and in practical application, the function allocation may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules, so as to complete all or part of the functions described above. In addition, the dynamic narrowband interference avoiding device and the dynamic narrowband interference avoiding method embodiment for the wideband OFDM system provided by the above embodiments belong to the same concept, and details of implementation processes thereof are referred to as method embodiments, and are not described herein.

The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.

The present invention also provides a computer readable medium, on which program instructions are stored, and when the program instructions are executed by a processor, the method for avoiding dynamic narrowband interference is suitable for a wideband OFDM system, which is provided by the above method embodiments.

The present invention also provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the dynamic narrowband interference avoidance method applicable to the wideband OFDM system described in the above method embodiments.

Please refer to fig. 6, which provides a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 6, the terminal 1000 can include: at least one processor 1001, at least one network interface 1004, a user interface 1003, memory 1005, at least one communication bus 1002.

Wherein a communication bus 1002 is used to enable connective communication between these components.

The user interface 1003 may include a Display screen (Display) and a Camera (Camera), and the optional user interface 1003 may also include a standard wired interface and a wireless interface.

The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), among others.

Processor 1001 may include one or more processing cores, among other things. The processor 1001 interfaces various components throughout the electronic device 1000 using various interfaces and lines to perform various functions of the electronic device 1000 and to process data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 1005 and invoking data stored in the memory 1005. Alternatively, the processor 1001 may be implemented in at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 1001 may integrate one or more of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 1001, but may be implemented by a single chip.

The Memory 1005 may include a Random Access Memory (RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 1005 includes a non-transitory computer-readable medium. The memory 1005 may be used to store an instruction, a program, code, a set of codes, or a set of instructions. The memory 1005 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the various method embodiments described above, and the like; the storage data area may store data and the like referred to in the above respective method embodiments. The memory 1005 may optionally be at least one memory device located remotely from the processor 1001. As shown in fig. 6, a memory 1005, which is one type of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a dynamic narrowband interference avoidance application suitable for a broadband OFDM system.

In the terminal 1000 shown in fig. 6, the user interface 1003 is mainly used as an interface for providing input for a user, and acquiring data input by the user; and the processor 1001 may be configured to invoke a dynamic narrowband interference avoidance application applicable to the wideband OFDM system stored in the memory 1005, and specifically perform the following operations:

step 2: estimating the noise power of the OFDM subcarriers in the set phi based on a preset period to generate a noise power estimation value set omega;

and step 3: judging whether each subcarrier in the set phi has narrow-band interference or not according to the noise power estimation value set omega and the parameter n;

In one embodiment, the processor 1001, after performing the turning off the data transmission on the interfered subcarrier, further performs the following operations:

and when the data transmission on the interfered subcarrier is closed, continuing the steps from the step 2 to the step 4, and continuously detecting and avoiding the interference.

In an embodiment, when the processor 1001 obtains the range set Φ of OFDM subcarriers that may be subjected to narrowband interference according to the parameters of the wideband OFDM system and the narrowband interference system, specifically performs the following operations:

and calculating the range value phi of the sub-carrier of the OFDM system corresponding to the overlapped frequency spectrum according to the overlapping of the working frequency spectrums of the OFDM system and the narrow-band interference system.

In an embodiment, when the processor 1001 determines whether there is narrowband interference in each subcarrier in the set Φ according to the set Ω of noise power estimation values and the parameter n, specifically performs the following operations:

acquiring a maximum noise power estimation value in the noise power estimation value set omega;

acquiring a subcarrier number corresponding to the maximum noise power estimation value;

calculating and generating a noise power average value based on the noise power estimation value set omega;

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory or a random access memory.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

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Dynamic narrowband interference avoidance method, device, storage medium and terminal suitable for broadband OFDM system

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