WO2021042724A1

WO2021042724A1 - Anti-interference method and apparatus for ofdm system, electronic device, and storage medium

Info

Publication number: WO2021042724A1
Application number: PCT/CN2020/084537
Authority: WO
Inventors: 缪永龙; 刘亮
Original assignee: 深圳市富斯科技有限公司
Priority date: 2019-09-04
Filing date: 2020-04-13
Publication date: 2021-03-11
Also published as: CN110401610A

Abstract

The present invention relates to the technical field of OFDM wireless broadband transmission. By receiving a signal synchronously at a receiving end of an OFDM system, then calculating a signal average power value and a signal power value for the signal by taking an OFDM symbol as a unit, then determining, according to the signal average power value and the signal power value, whether there is an interference signal in the OFDM unit, and if there is an interference signal, eliminating the interference signal, the interference signal in the OFDM system is simply and effectively eliminated, thereby achieving the technical effect of effectively improving the efficiency and communication quality.

Description

OFDM system anti-interference method, device, electronic equipment and storage medium

Technical field

The invention belongs to the technical field of OFDM wireless broadband transmission, and relates to a method, a device, electronic equipment and a storage medium for eliminating interference signals at a receiving end in an OFDM system.

Background technique

In the field of OFDM wireless broadband transmission technology, there are usually single-frequency, multi-frequency, and narrow-band interference signals that seriously affect the quality of communication. Traditionally, frequency hopping anti-interference technologies are used, and it is necessary to fully combine the information of the sender and receiver to switch between frequency bands to avoid interference sources. , And there is a delay.

technical problem

In summary, the existing OFDM wireless broadband transmission anti-interference technology has technical problems of large delay and low efficiency.

Technical solutions

To solve the above technical problems, the present invention provides an OFDM system anti-interference method. The OFDM system anti-interference method includes:

Synchronously receive signals at the receiving end of the OFDM system;

Calculate the average power value and signal power value of the signal by taking the OFDM symbol as the unit;

According to the signal average power value and signal power value, judge whether there is an interference signal in the OFDM unit;

If there is an interference signal, eliminate the interference signal.

Specifically, the step of judging whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value includes: if there is no interference signal, the signal is output normally.

Specifically, the step of judging whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value includes: if the signal power value is greater than the signal average power value, then there is an interference signal.

Specifically, the interference signal is a narrowband interference signal and/or a single-frequency interference signal and/or a multi-frequency interference signal.

Specifically, if there is interference, the power value of the interference signal position is set to 0.

The present invention also provides an electronic device, including a memory and a processor, the memory stores a computer program, and the computer program can be executed in the processor to implement any of the above methods.

The present invention also provides a storage medium that stores a computer program, and the execution of the computer program in the processor can realize any of the above-mentioned methods.

The present invention also provides an OFDM system anti-interference device, including:

Synchronous receiving module, used to synchronously receive signals at the receiving end of the OFDM system;

The calculation module is used to calculate the average power value and signal power value of the signal by using the OFDM symbol as the unit;

The judgment module is used to judge whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value;

Elimination module, if there is an interference signal, eliminate the interference signal.

Specifically, it also includes: an output module, which is used to output signals normally when there is no interference signal.

Specifically, the judgment module includes an analysis unit; the analysis unit is used to analyze the presence of interference signals when the signal power value is greater than the signal average power value.

Beneficial effect

The present invention provides an OFDM system anti-interference method. At the receiving end, the OFDM symbol is used as a unit to calculate the average power value and the signal power value of the signal, and then determine whether there is an interference signal in the OFDM unit according to the average signal power value and the signal power value, If there is an interference signal, the interference signal power value is set to 0 to eliminate the interference signal, so that the process of eliminating the interference signal is simple, the technical effect of saving resources, and there is no delay, and the technical effect of improving efficiency is achieved.

Description of the drawings

FIG. 1 is a flowchart of an OFDM system anti-interference method provided by an embodiment;

FIG. 2 is a flowchart of an improved method of the method in FIG. 1 provided by an embodiment;

FIG. 3 is a flowchart of an improved method of the method in FIG. 1 provided by an embodiment;

Figure 4 is a structural diagram of an electronic device provided by an embodiment;

FIG. 5 is a structural diagram of an OFDM system anti-interference method provided by an embodiment;

Fig. 6 is an improved device architecture diagram of the device in Fig. 5.

Embodiments of the present invention

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that, in the description of the present invention, unless otherwise clearly specified and limited, the term "OFDM" can be Orthogonal Frequency Division Multiplexing, and the term "storage medium" can be ROM, RAM, Various media such as magnetic disks or optical disks that can store computer programs. The term "processor" can be CPLD (Complex Programmable Logic Device), FPGA (Field-Programmable Gate Array), MCU (Microcontroller Unit), PLC (Programmable Logic) Controller: Programmable logic controller) and CPU (Central Processing Unit: Central Processing Unit) and other chips or circuits with data processing functions. The term "electronic device" can be any device with data processing functions and storage functions, and can generally include fixed terminals and mobile terminals, fixed terminals such as desktop computers, and mobile terminals such as mobile phones, PADs, and mobile robots. In addition, the technical features involved in the different embodiments of the present invention described later can be combined with each other as long as they do not conflict with each other.

Below, the present invention proposes some preferred embodiments to teach those skilled in the art to implement.

In order to highlight the innovation of the present invention and help those skilled in the art understand the present invention, before describing the specific embodiments of the present invention, first introduce the prior art closest to the present invention. The present invention is based on the closest prior art. Based on the wisdom of contributions.

OFDM technology is widely used in broadband transmission systems such as 5G communication and UAV image transmission. There are usually single-frequency, multi-frequency, and narrow-band interference. Narrow-band interference signals will seriously affect the quality of communication. Traditionally, frequency hopping anti-interference technologies are used. , So as to realize the stability of signal transmission.

Although the existing OFDM technology can achieve a certain degree of anti-interference ability, the anti-interference technology needs to fully combine the information of the transmitter and the receiver to switch between frequency bands to avoid interference sources, and the implementation process is complicated and there is a delay.

The method of using the power information of the receiving end to remove the interference source proposed in the present invention does not bring about system delay, and the realization process is simple, and the technical effect of effectively improving efficiency and communication quality is achieved.

FIG. 1 is a flowchart of an OFDM system anti-interference method provided by an embodiment, and shows an OFDM system anti-interference method to solve the above technical problem.

Referring to Figure 1, an OFDM system anti-interference method includes:

Step S10, synchronously receive signals at the receiving end of the OFDM system;

Step S11: Calculate the average power value and signal power value of the signal by using the OFDM symbol as the unit;

Step S12, judging whether there is an interference signal in the OFDM unit according to the average power value and the signal power value;

In step S13, if there is an interference signal, the interference signal is eliminated.

In this embodiment, the signal is received synchronously at the receiving end of the OFDM system, and the signal is calculated in units of OFDM symbols to calculate the average power value and signal power value of the signal, and then determine the OFDM unit based on the average signal power value and signal power value If there is an interference signal in the OFDM system, if there is an interference signal, set the power value of the interference signal position to 0 to eliminate the interference signal, so as to simply and effectively eliminate the interference signal in the OFDM system and achieve the technical effect of effectively improving the efficiency. .

It should be noted that the anti-interference method of the OFDM system provided in this embodiment may be to receive the signal at the receiving end of the OFDM system. Preferably, after the system synchronization module, the signal of each OFDM symbol is calculated by taking the OFDM symbol as the unit. At the same time, the power value of the OFDM symbol signal is calculated separately. Preferably, when the signal power value is greater than the average signal power value of the OFDM signal, there is an interference source near the signal. Preferably, the signal near the left and The N units on the right or the signal power value of the interference signal are assigned as zero, so as to eliminate the influence of signal inaccuracy caused by interference.

It should also be noted that the OFDM symbol unit is the FFT length.

It should also be noted that the power value of the signal is the sub-carrier power value.

It should also be noted that the interference signal may be a narrowband interference signal, a single-frequency interference signal, or a multi-frequency interference signal.

Fig. 2 is a flowchart of an improved method of the method in Fig. 1 provided by an embodiment, showing an improved method of an OFDM system anti-interference method to solve the technical problem of task execution conflict.

Referring to Fig. 2, the method in Fig. 1 further includes:

Step S20, judging whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value;

In step S21, if there is no interference signal, the signal is output normally.

In this embodiment, by calculating the signal average power value and the signal power value, and then comparing the two signal power values, preferably, if the signal power value is less than or equal to the signal average power value, there is no interference signal, preferably , The signal is output normally, so as to achieve the technical effect of improving efficiency.

Fig. 3 is a flowchart of an improved method of the method in Fig. 1 provided by an embodiment, showing an improved method of an OFDM system anti-interference method to solve how to determine whether there is an interference signal.

Referring to Fig. 3, the method in Fig. 1 further includes:

Step S11, judging whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value;

In step S120, if the signal power value is greater than the signal average power value, there is an interference signal.

In this embodiment, it is possible to determine whether the signal power value is greater than the OFDM unit symbol average power value by calculating the signal average power value of multiple OFDM unit symbols. If it is greater than the average power value of the OFDM unit symbol, there is an interference signal, thereby determining the interference signal and eliminating the interference in the OFDM system Signal, to achieve the technical effect of effective signal transmission.

It should be noted that the signal average power value of the OFDM unit symbol can be calculated by root-saving the average value of the OFDM symbol power value or the OFDM symbol power value multiplied by N, where N is any positive real number.

Fig. 4 is a structural diagram of an electronic device provided by an embodiment, showing an electronic device for storing and processing computer programs.

Referring to FIG. 4, an electronic device includes a memory and a processor, and the memory stores a computer program. The execution of the computer program in the processor can implement any of the methods shown in FIGS. 1-3.

In an embodiment, a storage medium is further provided, and the storage medium stores a computer program, and the computer program is executed in the processor to implement any of the methods shown in FIGS. 1-3.

FIG. 5 is a structural diagram of an OFDM system anti-interference apparatus provided by an embodiment. The OFDM system anti-interference apparatus includes:

The synchronous receiving module 40 is used to synchronously receive signals at the receiving end of the OFDM system;

The calculation module 41 is used to calculate the average power value and the signal power value of the signal by using the OFDM symbol as a unit;

The judging module 42 is configured to judge whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value;

The elimination module 43, if there is an interference signal, is used to eliminate the interference signal.

In this embodiment, the synchronous receiving module 40 synchronously receives the signal at the receiving end of the OFDM system, and then transmits the signal to the calculation module 41, which is used to calculate the average power value and signal power value of the signal in units of OFDM symbols, and then transmit The signal average power value and signal power value are sent to the judging module 42 for judging whether there is an interference signal in the OFDM unit according to the average power value and the signal power value. If there is an interference signal, it is transmitted to the cancellation module 43 to eliminate the interference signal. Therefore, the interference signal in the OFDM system can be eliminated simply and effectively, and the technical effect of effectively improving the efficiency can be achieved.

It should be noted that the OFDM system anti-interference device provided in this embodiment may be that the synchronization module 40 receives signals at the receiving end of the OFDM system. Preferably, after the system synchronization module, the calculation module 41 uses the OFDM symbol as a unit to calculate Obtain the average power of each OFDM symbol, and calculate the power value of the OFDM symbol signal separately. Preferably, when the signal power value is greater than the average power value of the OFDM, the judgment module 42 both determines that there is an interference source near the signal, preferably Ground, the cancellation module 43 assigns the signal power values of the N units on the left and right sides of the signal to zero to eliminate the influence of signal inaccuracy caused by interference.

It should also be noted that the OFDM symbol unit is the FFT length.

FIG. 6 is an improved device architecture diagram of the device in FIG. 5, showing an anti-interference device of the OFDM system.

Referring to Fig. 6, the anti-interference apparatus of the OFDM system in Fig. 5 further includes:

The analyzing unit 420 is configured to analyze the presence of interference signals when the signal power value is greater than the signal average power value.

In this embodiment, the analysis unit 420 determines whether there is an interference signal by comparing the signal power value greater than the signal average power value, so as to eliminate the interference signal and achieve the technical effect of effectively improving efficiency and communication quality.

Claims

An OFDM system anti-interference method is characterized in that it includes:

Synchronously receive signals at the receiving end of the OFDM system;

Calculating the average power value and signal power value of the signal by using the OFDM symbol as a unit;

Judging whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value;

If the interference signal exists, the interference signal is eliminated.
The method according to claim 1, wherein after the step of judging whether there is an interference signal in the OFDM unit based on the signal average power value and the signal power value, the method further comprises:

If the interference signal does not exist, the signal is output normally.
The method according to claim 1, wherein the step of judging whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value comprises:

If the signal power value is greater than the signal average power value, the interference signal exists.
The method according to claim 1, wherein the interference signal is a narrowband interference signal and/or a single frequency interference signal and/or a multi-frequency interference signal.
An electronic device comprising a memory and a processor, the memory storing a computer program, wherein the execution of the computer program in the processor can implement any one of the methods in claims 1-4.
A storage medium storing a computer program, wherein the computer program is executed in a processor to implement any one of the methods in claims 1-4.
An OFDM system anti-interference device, which is characterized in that it comprises:

Synchronous receiving module, used to synchronously receive signals at the receiving end of the OFDM system;

A calculation module for calculating the average power value and signal power value of the signal by using the OFDM symbol as a unit;

A judging module, configured to judge whether there is an interference signal in the OFDM unit according to the signal average power value and the signal power value;

The elimination module is used to eliminate the interference signal if the interference signal exists.

8. The device according to claim 7, further comprising: an output module; the output module is used to output the signal normally when the interference signal is not present.
7. The device according to claim 7, wherein the judgment module comprises an analysis unit; the analysis unit is configured to analyze the presence of the interference signal when the signal power value is greater than the signal average power value.
8. The apparatus according to claim 7, wherein the interference signal is a narrowband interference signal and/or a single frequency interference signal and/or a multi-frequency interference signal.