CN114915357B - Method for detecting interference frequency points and electronic equipment - Google Patents

Method for detecting interference frequency points and electronic equipment Download PDF

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CN114915357B
CN114915357B CN202210415200.8A CN202210415200A CN114915357B CN 114915357 B CN114915357 B CN 114915357B CN 202210415200 A CN202210415200 A CN 202210415200A CN 114915357 B CN114915357 B CN 114915357B
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frequency point
point set
interference frequency
interference
receiving end
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CN114915357A (en
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黄卫强
仲杰
孟骏亚
吴勉
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Shenzhen Tongchuang Communication Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application relates to the technical field of communication, and provides a method for detecting interference frequency points, which comprises the following steps: the receiving end receives a first data frame from the transmitting end through a main channel; the receiving end determines a first interference frequency point set according to the receiving condition of the first data frame; the receiving end receives signals through an auxiliary channel; the receiving end determines a second interference frequency point set according to the receiving condition of the signal; the receiving end determines a working frequency point set according to the first interference frequency point set and the second interference frequency point set, wherein the working frequency point set is a frequency point set after the first interference frequency point set and the second interference frequency point set are removed by a preset frequency point set; the receiving end sends the working frequency point set to the sending end. The method can improve the reliability of wireless communication data transmission.

Description

Method for detecting interference frequency points and electronic equipment
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and an electronic device for detecting interference frequency points.
Background
With the increasing complexity of electromagnetic environments, there is a serious interference in current wireless communication between electronic devices, for example, interference between different transmitters that communicate with the same receiver, interference between signals transmitted by one transmitter to multiple receivers, and mutual interference between different transmitter-receiver pairs, etc. The anti-interference technology adopted at present is that the electronic equipment receives service data and simultaneously detects interference frequency points on an operating frequency band in real time, and an adaptive filter method is generally adopted to offset interference frequency points in the operating frequency band. The adaptive filter of the method has very high real-time performance, and can meet the requirements of real-time tracking and identifying the positions of the interference frequency points. However, in a fast fading channel, the adaptive filter coefficient is not only high in computational complexity, but also cannot meet the real-time requirement, so that it is difficult to ensure the reliability of wireless communication data transmission of electronic equipment in a complex electromagnetic environment.
Therefore, how to improve the reliability of wireless communication data transmission is a current urgent problem to be solved.
Disclosure of Invention
The application provides a method for detecting interference frequency points and electronic equipment, which can improve the reliability of wireless communication data transmission.
In a first aspect, a method of detecting a scrambling frequency point is provided, comprising: the receiving end receives a first data frame from the transmitting end through a main channel; the receiving end determines a first interference frequency point set according to the receiving condition of the first data frame; the receiving end receives signals through an auxiliary channel; the receiving end determines a second interference frequency point set according to the receiving condition of the signal; the receiving end determines a working frequency point set according to the first interference frequency point set and the second interference frequency point set, wherein the working frequency point set is a frequency point set after the first interference frequency point set and the second interference frequency point set are removed by a preset frequency point set; the receiving end sends the working frequency point set to the sending end.
In the method, the main channel is used for receiving the service data of wireless communication, and the auxiliary channel is used for scanning the interference condition of the wireless communication frequency point at fixed time; the receiving end scans the condition that signals of different frequency points in a preset frequency point set are interfered by the outside at fixed time through an auxiliary channel, determines a second interference frequency point set according to the interference condition, and judges whether the corresponding working frequency point is interfered by the outside or not through a first data frame received by a main channel, so as to determine a first interference frequency point set; and finally, the receiving end eliminates the first interference frequency point set and the second interference frequency point set from the preset frequency point set to obtain a working frequency point set which is not interfered by the outside, so that the receiving end can conveniently transmit wireless communication data according to the working frequency point set. Therefore, compared with the existing method that the receiving end performs wireless communication frequency point elimination through the high-complexity adaptive filter, the method for performing interference frequency point elimination on the wireless communication frequency points of the receiving end by adopting the double-receiving channels in the design of the wireless communication system not only reduces the design complexity of the wireless communication system, but also improves the reliability of wireless communication data transmission.
Optionally, the receiving condition of the signal includes signal strength and a signal correlation peak value, and the receiving terminal determines a second interference frequency point set according to the receiving condition of the signal, including: when the signal strength is smaller than an strength threshold value, and when the signal correlation peak value is larger than or equal to a correlation threshold value, the receiving end determines that the frequency point corresponding to the signal does not belong to the second interference frequency point set; when the signal strength is greater than or equal to the strength threshold, and when the signal correlation peak value is smaller than the correlation threshold, the receiving end determines that the frequency point corresponding to the signal belongs to the second interference frequency point set.
In this embodiment, compared with the case that the receiving end determines whether the frequency point corresponding to the signal (i.e., the frequency point in the preset frequency point set) is the interference frequency point only according to the signal strength or the signal correlation peak value, in this embodiment, the receiving end determines whether the frequency point corresponding to the signal is the interference frequency point according to the signal strength and the signal correlation peak value together, so that the accuracy of the receiving end in judging the interference frequency point is further improved.
Optionally, when the number of the frequency points of the first interference frequency point set is smaller than a number threshold, the receiving end increases the intensity threshold according to a first rule; and when the number of the frequency points of the first interference frequency point set is greater than or equal to the number threshold, the receiving end reduces the intensity threshold according to a second rule.
In this embodiment, the receiving end timely adjusts the auxiliary channel to judge the intensity threshold of the interference frequency point according to the number of the first interference frequency point set, so as to avoid the excessive or insufficient auxiliary channel to reject the frequency point in the preset frequency point set; the method can ensure that the wireless communication has enough working frequency points, can avoid the condition of communication interruption, and can ensure that the working frequency points participating in the wireless communication are all undisturbed frequency points so as to improve the reliability of wireless communication data transmission.
Optionally, the first rule includes: the intensity threshold value Q d Positively correlated with the intra analog-to-digital conversion sample number FL, said Q d And maximum noise power value P n Positive correlation, and the Q d And inversely correlating with the frequency point number Size (A) of the first interference frequency point set.
Optionally, the first rule is:
Figure BDA0003605522080000021
wherein the Q is d The Size (A) is the frequency point number of the first interference frequency point set, the FL is the intra-frame digital conversion sampling number, and P is the intensity threshold n And the maximum noise power value is the number of frequency points of the preset frequency point set, and M is a positive number which is more than 0 and less than 1.
Optionally, the second rule includes: the intensity threshold value Q d Positively correlated with FL, and the Q d And P n Positive correlation.
Optionally, the second rule is:
Figure BDA0003605522080000022
wherein the Q is d For the intensity threshold, FL is the number of intra-frame analog-to-digital conversion samples, P n And the maximum noise power value is the number of frequency points of the preset frequency point set, and M is a positive number which is more than 0 and less than 1.
Optionally, the receiving end determines a first interference frequency point set according to the receiving condition of the first data frame, including: when the receiving condition of the first data frame meets the error data frame judging condition, the receiving end adds 1 to the value of a first counter, and adds 1 to the value of a second counter, wherein the first counter is used for recording the number of the received error data frames, and the second counter is used for recording the number of all the received data frames; when the value of the second counter is equal to a preset value, and when the ratio of the value of the first counter to the preset value reaches or exceeds a first threshold value, the receiving end determines that the frequency point transmitting the first data frame belongs to the first interference frequency point set.
Optionally, the receiving end adds 1 to the value of the second counter, including: when the first data frame is the first error data frame, the receiving end starts the second counter and adds 1 to the value of the second counter.
In this embodiment, when the first data frame received by the receiving end is a correct data frame, the receiving end will not start the second counter, and only when the first data frame received by the receiving end is the first error data frame, the receiving end will start the second counter to count. Therefore, the receiving end controls the starting mode of the second counter, so that operation and storage resources can be saved, and the power consumption of the receiving equipment can be reduced.
Optionally, the receiving end determines a first interference frequency point set according to the receiving condition of the first data frame, including: when the receiving condition of the first data frame meets the error data frame judging condition, the receiving end adds 1 to the value of a third counter, and the third counter is used for recording the number of the continuously received error data frames; and when the number of the third counters reaches or exceeds a second threshold, the receiving end determines that the frequency point transmitting the first data frame belongs to the first interference frequency point set.
In this embodiment, the receiving end determines whether the working frequency point corresponding to the first data frame is the interference frequency point according to the number of times that the main channel continuously receives the first data frame as the error data frame, so that the efficiency of the receiving end in determining the interference frequency point can be improved.
Optionally, the first set of interference frequency points includes a target interference frequency point, and the method further includes: when the number of times that the target interference frequency point is added into the first interference frequency point set is smaller than a third threshold value, the receiving end moves the target interference frequency point out of the first interference frequency point set after a first period of time, wherein the first period of time is the time that the target interference frequency point stays in the first interference frequency point set; when the number of times that the target interference frequency point is added into the first interference frequency point set is greater than or equal to the third threshold value, the receiving end moves the target interference frequency point out of the first interference frequency point set after a second period of time, wherein the second period of time is the time that the target interference frequency point stays in the first interference frequency point set, and the second period of time is greater than the first period of time.
In this embodiment, when the target interference frequency point is a non-serious interference frequency point, the receiving end stops the target interference frequency point for a short time (i.e. the first period); when the target interference frequency point is a severe interference frequency point, the receiving end stops the operation of the target interference frequency point for a long time (i.e. a second period). The receiving end determines whether the target interference frequency point is a serious interference frequency point according to the times of adding the target interference frequency point into the first interference frequency point set, and adjusts the communication stopping time (namely the time of the target interference frequency point staying in the first interference frequency point set) according to the severity of the target interference frequency point so as to ensure that all the working frequency points currently participating in communication are frequency points which are not interfered by the outside, thereby improving the reliability of wireless communication data transmission.
In a second aspect, there is provided an electronic device comprising a processor and a memory, the memory for storing a computer program, the processor for calling and running the computer program from the memory, such that the electronic device performs the method of any of the first aspects.
In a third aspect, there is provided a computer readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the method of any one of the first aspects.
Advantageous effects in the second and third aspects of the present application see the advantageous effects of the first aspect.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a wireless communication system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting interference frequency points according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for calculating CRC of service data according to an embodiment of the invention;
fig. 4 is a schematic diagram of a process of scanning a preset frequency point set by an auxiliary channel in an embodiment of the present invention;
fig. 5 is a schematic diagram of a process step of recovering interference frequency points from a first interference frequency point set in an embodiment of the present invention;
FIG. 6 is a flowchart illustrating the steps of a method for determining a scrambling code point by a secondary channel;
FIG. 7 is a flowchart illustrating steps of a method for detecting interference frequency points by a main channel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
In addition, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
In the current complex electromagnetic environment, serious interference exists in wireless communication between electronic devices, such as mutual interference between different transceiver devices. Typically, the electronic device has only one receiving channel for receiving traffic data transmitted by the transmitting end, and the receiving channel employs an adaptive filter to cancel the interference scrambling point within the operating frequency band. Because the adaptive filter needs to have very high real-time performance, the requirements of real-time tracking and identifying the positions of the interference frequency points can be met. However, in a fast fading channel, the adaptive filter coefficient is not only high in computational complexity, but also cannot meet the real-time requirement, so that it is difficult to ensure the reliability of wireless communication data transmission of electronic equipment in a complex electromagnetic environment. Therefore, how to improve the reliability of wireless communication data transmission is a current urgent problem to be solved.
In order to solve the above problems, the present application adopts a dual-reception channel (i.e., a main channel and an auxiliary channel) structure in combination with various anti-interference technologies in the design of a wireless communication system to realize reliable transmission of wireless communication data. In the dual-reception channel structure design, a main channel is used for wireless communication of normal service data of a receiving end, and an auxiliary channel is used for periodically and circularly scanning a space electromagnetic environment between the receiving end and the transmitting end to determine the frequency point interference condition of the current electronic equipment in the working frequency spectrum range.
The present application is described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1, the wireless communication system includes a transmitting end 101 and a receiving end 102, wherein the transmitting end 101 includes: a transmitting channel 1011, a frequency hopping module 1012, and a radio frequency output module 1013, where the transmitting channel 1011 is configured to generate a wireless communication data frame (e.g., a first data frame) and transmit the wireless communication data frame to the receiving end 101 according to the current wireless communication frequency point selected by the frequency hopping module 1012; the frequency hopping module 1012 is configured to randomly select any one of the working frequency points from the working frequency point set at a fixed time interval as a current wireless communication frequency point; the rf output module 1013 is configured to send a wireless communication data frame (e.g., a first data frame) to the receiving end 102 according to a current wireless communication frequency point; the receiving end 102 includes: the system comprises a radio frequency input module 1021, a main channel 1022, an auxiliary channel 1023 and an interference fusion module 1024, wherein the radio frequency input module 1021 comprises a main radio frequency module and an auxiliary radio frequency module for receiving and processing received signals, and the main radio frequency module is used for receiving a wireless communication data frame (i.e. a first data frame) sent by a sending end 101 according to a working frequency point set; the auxiliary radio frequency module is used for receiving signals corresponding to different frequency points in a preset frequency point set; the main channel 1022 is configured to determine, according to the condition that the radio frequency input module 1021 receives wireless communication data, an operating frequency point of the operating frequency point set that is interfered by the outside, and generate a first interference frequency point set; the auxiliary channel 1023 is configured to determine a frequency point of the preset frequency point set, which is interfered by the outside, according to the condition that the radio frequency input module 1021 receives the wireless communication data, and generate a second frequency point interference set; the interference fusion module 1024 is configured to subtract the first interference frequency point set and the second interference frequency point set according to the preset frequency point set and generate a working frequency point set 1025.
The number of the frequency points of the preset frequency point set refers to the ratio of the information bandwidth of the working scanning frequency band to the information bandwidth of the working frequency points; the preset frequency point set is a frequency point set formed by dividing a working scanning frequency band into a plurality of discrete frequency points according to the information bandwidth of the working frequency points; the preset frequency point set is not subjected to interference frequency point removal; the working frequency point set is a frequency point set formed by removing other frequency points after the first interference frequency point set and the second interference frequency point set from the preset frequency point set. For example, the starting frequency point of the working scanning frequency band is 152MHz, the end frequency point of the working scanning frequency band is 663MHz, the working scanning frequency band is 512MHz, the information bandwidth of the working frequency point is 1MHz, the number of preset frequency point sets is 512 (i.e. 512MHz divided by 1 MHz), the preset frequency point sets= {152MHz,153MHz,154MHz, … …,662MHz,663MHz }, the first interference frequency point set is only 153MHz as the interference frequency point, the second interference frequency point set is only 663MHz as the interference frequency point, and the working frequency point sets= {152MHz,154MHz, … …,662MHz } (i.e. the frequency point sets formed by other frequency points except for the 153MHz and 663MHz are removed from the preset frequency point sets).
The transmission channel 1011 generates a radio communication data frame; the frequency hopping module 1012 randomly and randomly takes one frequency point from the working frequency point set as a current wireless communication frequency point; the transmission channel 1011 transmits the frequency points extracted by the frequency hopping module 1012 and the wireless communication data frame to be transmitted to the radio frequency output module 1013. The rf output module 1013 sends the wireless communication data frame to the receiving end 102 according to the frequency point extracted by the frequency hopping module 1012. The radio frequency input module 1021 of the receiving end 102 receives and processes the wireless communication data frame sent by the sending end 101; the main channel 1022 determines whether the frequency point extracted by the frequency hopping module 1012 is an interference frequency point according to the wireless communication data frame sent by the radio frequency input module 1021, and generates a first interference frequency point set. The radio frequency input module 1021 receives signals corresponding to each frequency point in a preset frequency point set, and determines a second interference frequency point set according to the signals corresponding to each frequency point; the interference fusion module 1024 subtracts the first interference frequency point set sent by the main channel 1022 and the second interference frequency point set sent by the auxiliary channel 1023 according to the preset frequency point set to generate a working frequency point set 1025; the receiving end 102 sends the set of operating frequency points 1025 to the frequency hopping module 1012 of the receiving end 101. The architecture of the wireless communication system shown in fig. 1 is merely an example of the present application and should not be construed as limiting the possible embodiments of the present application.
The main channel 1022 can be implemented in a C51 single chip microcomputer or a field programmable gate array (Field Programmable Gate Array, FPGA), the auxiliary channel 1023 can be implemented in an FPGA, and the application does not limit what hardware is specifically adopted for the main channel 1022 and the auxiliary channel 1023, so that a user can select the main channel and the auxiliary channel according to actual application requirements. For example, the main channel 1023 calculates the CRC of the first data frame using a single chip microcomputer C8051F020; the FPGA may select the ALTERA 5AGXBB7D4F35I5 chip.
Fig. 2 is a flow chart illustrating a method for detecting a scrambling frequency point in an embodiment of the present application, and the method shown in fig. 2 is described below with reference to fig. 1, and includes:
s201, the receiving end receives a first data frame from the sending end through the main channel.
Illustratively, the first data frame includes at least one wireless communication data frame; the frame structure of the wireless communication data frame includes three parts: a frame header, a data portion (i.e., traffic data), and a frame end, e.g., a training sequence with L bits for the frame header; the frame end is cyclic redundancy check (Cyclic Redundancy Check, CRC) data of M bits, and can also be check data obtained by other available check methods, which is not limited in the application; the data portion is N bits of traffic data. The data portion and the frame tail are defined as a transmission data frame, and the data processing module of the receiving end 102 is configured to generate the transmission data frame and send the transmission data frame to the sending channel 1011. For example, the frame structure of the wireless communication data frame is 64 bits of training sequence plus 2048 bits of service data plus 16 bits of CRC check data, wherein the CRC check data uses X 16 +X 12 +X 5 The +1 polynomial is used as a generation formula of CRC, and the generation method of CRC can calculate by byte table lookup, and can also adopt a linear feedback shift register to generate CRC; for example, the polynomial computes CRC data for each byte in the service data, resulting in 256 (i.e., 2048 divided by 8) 16 bits (i.e., 16 bits) of CRC data; summing the 256 16-bit (i.e., 16-bit) CRC data to obtain the final 16-bit CRC data of the service data (i.e., the CRC data of the service data); of course, the CRC data may be 32-bit, 64-bit or even more data, which is not limited in this application; the frame length of the single transmission data frame is 2064 (i.e., 2048+16); the data processing module sends the transmission data frame to the sending channel 1011; transmitting deviceChannel 1011 performs coded modulation on the transmission data frame to generate a modulated transmission data frame; the transmission channel 1011 adds a training sequence of L bits as a frame alignment signal to the front of the modulated transmission data frame to generate a radio communication data frame.
For example, the method for calculating the CRC of the first data frame by the transmitting end 101 or the receiving end 102 is the same, taking the process of calculating the CRC of the first data frame by the transmitting end 101 as an example, as shown in fig. 3, the data processing module of the transmitting end 101 obtains the first address of each service data, obtains the byte number of each service data according to the first address of each service data, and calculates the CRC of each service data by using the CRC generation formula; after the data processing module calculates the CRC of each service data, the service data and the CRC are framed into a data transmission frame and sent to a sending channel.
The frequency hopping module 1012 periodically and randomly acquires the current wireless communication frequency point from the operating frequency set according to the transmission interval (i.e., the frequency hopping time interval) of the wireless communication data frame, and sets the current wireless communication frequency point to the radio frequency output module 1013; in addition, the current wireless communication frequency point is kept unchanged in the frequency hopping time interval. Here, the method of the hopping module 1012 randomly acquiring the current wireless communication frequency point from the set of operating frequency points is called a hopping scheme, and the hopping scheme follows the principle of randomness and opportunity equalization.
The transmission channel 1011 transmits the wireless communication data frame to the radio frequency output module 1013; the rf output module 1013 transmits the wireless communication data frame to the receiving end 102 according to the current wireless communication frequency point. The receiving end 102 receives the wireless communication data frame (i.e., the first data frame) sent by the sending end 101 through the rf input module 1021.
S202, the receiving end determines a first interference frequency point set according to the receiving condition of the first data frame.
As shown in fig. 1, the receiving end 102 receives a first data frame corresponding to a working frequency point set through a main rf module of the rf input module 1021; the main rf module demodulates and analog-to-digital converts the received first data frame to generate first digital data, and sends the first digital data to the main channel 1022. The main channel 1022 determines whether the operating frequency point corresponding to the first digital data is an interference frequency point according to the receiving condition of the first digital data, and stores the operating frequency point determined as the interference frequency point in the first interference frequency point set. The Analog-to-Digital conversion processing process is that a first data frame passes through a radio frequency filter with a working frequency point (for example, 163MHz in a working frequency point set) as a center and then Analog Digital (AD) sampling is performed to obtain first Digital data; wherein the sampling frequency of the AD samples follows the nyquist sampling theorem: the sampling frequency is greater than or equal to 2 times of the frequency point information bandwidth. The main radio frequency module sends the first digital data to the main channel 1022, and the main channel 1022 further determines whether the working frequency point corresponding to the first digital data is an interference frequency point.
The above-mentioned reception cases include: correct data frame conditions and erroneous data frame conditions; the above-described error data frame conditions (i.e., error data frame determination conditions) include: the situation that the error data frame occurs due to the difference between the check value calculated by the receiving end 102 and the initial check value calculated by the transmitting end 101 of the first data frame, and the situation that the error data frame occurs due to the error of the code element of the first data frame; the correct data frame condition (i.e., correct data frame determination condition) refers to the case where the first data frame received by the receiving end 102 is the same as the first data frame transmitted by the transmitting end 101.
As an optional embodiment, the determining, by the receiving end, the first set of interference frequency points according to the receiving condition of the first data frame includes: when the receiving condition of the first data frame meets the error data frame judging condition, the receiving end adds 1 to the value of the first counter, and adds 1 to the value of the second counter, wherein the first counter is used for recording the number of the received error data frames, and the second counter is used for recording the number of all the received data frames; when the value of the second counter is equal to the preset value, and when the ratio of the value of the first counter to the preset value reaches or exceeds a first threshold value, the receiving end determines that the frequency point transmitting the first data frame belongs to the first interference frequency point set. The receiving end sets a set of frequency point counter for each frequency point in a preset frequency point set, and the frequency point counter comprises: a first frequency point counter and a second frequency point counter.
For example, as shown in fig. 1, the receiving end 102 receives a first data frame corresponding to the working frequency point set through a main radio frequency module of the radio frequency input module 1021; the main rf module demodulates and analog-to-digital converts the received first data frame to generate first digital data, and sends the first digital data to the main channel 1022. The main channel 1022 determines whether the first data frame corresponding to the first digital data is an error data frame, that is, determines whether the first data frame corresponding to the first digital data satisfies an error data frame determination condition. When the main channel 1022 determines that the first data frame corresponding to the first digital data does not meet the error data frame determination condition, it indicates that the first data frame received by the receiving end 102 is a correct data frame, and the main channel 1022 controls the frequency point counter of the working frequency point corresponding to the first data frame to not start the counting function. When the main channel 1022 determines that the first data frame corresponding to the first digital data meets the error data frame determination condition, it is indicated that the first data frame received by the receiving end 102 is an error data frame, at this time, the main channel 1022 controls the frequency counter of the working frequency point corresponding to the first data frame to start the counting function, that is, the value of the first counter is increased by 1, and the main channel 1022 controls the value of the second counter to be increased by 1. When the value of the second counter is equal to a preset value, and when the ratio of the value of the first counter to the value of the second counter reaches or exceeds a first threshold value, the main channel 1022 determines that the working frequency point corresponding to the first data frame is an interference frequency point, and stores the working frequency point corresponding to the first data frame in a first interference frequency point set; the preset determination time refers to at least two scanning periods, where the scanning periods refer to the time consumed by the auxiliary channel 1023 to scan the whole working scanning frequency band (i.e. the whole preset frequency point set); the first threshold is used for indicating the maximum number of times that the first data frame is allowed to be an error data frame in one scanning period; the preset value refers to the number of times the receiving end 102 receives the working frequency point corresponding to the first data frame.
For example, the current working frequency point is 152 mhz, the data frame currently received by the main radio frequency module is a first data frame X, the initial CRC value of the first data frame X (i.e., the CRC value of the service data calculated before the sending end 102 is not sent) is Y1, the CRC value of the received first data frame X is calculated by the main channel 1022 of the receiving end 102 to be Y2, the first threshold is 30%, the preset value is 10, when the main channel 1022 judges that Y1 is equal to Y2, it is indicated that the first data frame X received by the receiving end 102 is a correct data frame, and at this time, the main channel 1022 controls the frequency counter of the working frequency point corresponding to the first data frame to not start counting; when the main channel 1022 determines that Y1 is not equal to Y2, it indicates that the first data frame X received by the receiving end 102 is an error data frame, and at this time, the main channel 1022 controls the frequency counter of the working frequency point corresponding to the first data frame to start counting; when the value of the second counter is 10 (i.e. the preset value), if the value of the first counter of the first data frame corresponding to the working frequency point is 5, the ratio (i.e. 50%) of the value of the first counter to the preset value is greater than the first threshold (i.e. 30%), which indicates that the working frequency point corresponding to the first data frame is an interference frequency point, and the working frequency point corresponding to the first data frame is stored in the first interference frequency point set. If the value of the first counter of the working frequency point corresponding to the first data frame is 2, the ratio (20%) of the value of the first counter to the preset value is smaller than a first threshold (30%), which indicates that the working frequency point corresponding to the first data frame is a non-interference frequency point.
As another alternative embodiment, the receiving end increments the value of the second counter by 1, including: when the first data frame is the first error data frame, the receiving end starts the second counter and adds 1 to the value of the second counter. The first error data frame refers to the first data frame being determined as an error data frame for the first time. For example, as shown in fig. 1, the main rf module of the rf input module 1021 sends the processed first data frame (i.e., the first digital data) to the main channel 1022; if the main channel 1022 determines that the first data frame is the first error data frame, the main channel 1022 controls the second counter of the working frequency point corresponding to the first data frame to start the counting function; as long as the main channel 1022 determines that the first data frame is a non-error data frame, which indicates that the working frequency point corresponding to the first data frame is not interfered by the outside, the main channel 1022 will not control the second counter to start the counting function, and the main channel 1022 will not control the second counter to start the counting function until the first data frame is determined to be an error data frame. Therefore, the main channel 1022 of the receiving end 102 controls the second counter to start, which not only saves operation and storage resources, but also reduces the power consumption of the receiving device.
As yet another optional embodiment, the determining, by the receiving end, the first set of interference frequency points according to the receiving condition of the first data frame includes: when the receiving condition of the first data frame meets the error data frame judging condition, the receiving end adds 1 to the value of a third counter, wherein the third counter is used for recording the number of the continuously received error data frames, namely the third counter is used for recording the number of the continuously received data frames sent by the same frequency point as the number of the error data frames; when the number of the third counters reaches or exceeds the second threshold, the receiving end determines that the frequency point for transmitting the first data frame (namely, the working frequency point corresponding to the first data frame) belongs to the first interference frequency point set. The second threshold value refers to the maximum number of times that the first data frame is allowed to be a consecutive error data frame.
For example, the second threshold is 2, the initial value of the third counter is 0, the operating frequency point F1, and the first data frame includes: the main rf module of the rf input module 1021 transmits the processed first data frame (i.e., the first digital data) to the main channel 1022; if the main channel 1022 receives the wireless communication data frame X1 sent by the working frequency point F1 for the first time, and then determines that the wireless communication data frame X1 is an error data frame, then controls the third counter to be set to 1; if the main channel 1022 receives the wireless communication data frame X2 sent by the working frequency point F1 for the second time, and determines that the wireless communication data frame X2 is an error data frame, then the third counter is controlled to be set to 2; if the main channel 1022 receives the wireless communication data frame X3 sent by the working frequency point F1 for the third time, and determines that the wireless communication data frame X3 is still an error data frame, then the third counter is controlled to be set to 3; because the number of times (i.e., 3) that the first data frame continuously transmitted by the operating frequency point F1 is an erroneous data frame exceeds the second threshold (i.e., 2), the main channel 1022 determines that the operating frequency point corresponding to the first data frame is an interference frequency point, and stores the operating frequency point corresponding to the first data frame in the first interference frequency point set.
For another example, the second threshold is 2, the initial value of the third counter is 0, the operating frequency point F2, and the first data frame includes: a wireless communication data frame Z1 and a wireless communication data frame Z2, and the main radio frequency module of the radio frequency input module 1021 sends the processed first data frame (i.e., the first digital data) to the main channel 1022; if the main channel 1022 receives the wireless communication data frame Z1 sent by the working frequency point F2 for the first time, and then determines that the wireless communication data frame Z1 is an error data frame, then controls the third counter to be set to 1; if the main channel 1022 receives the wireless communication data frame Z2 sent by the working frequency point F2 for the second time, and determines that the wireless communication data frame Z2 is an error data frame, the third counter is controlled to be set to 2; because the number of times that the first data frame continuously sent by the working frequency point F2 is an error data frame reaches (i.e. is equal to) the second threshold value (i.e. 2), the main channel 1022 of the receiving end 102 determines that the working frequency point corresponding to the first data frame is an interference frequency point, and stores the working frequency point corresponding to the first data frame in the first interference frequency point set.
In this embodiment, the main channel 1022 of the receiving end 102 directly determines whether the working frequency point corresponding to the first data frame is an interference frequency point according to the number of times that the main channel 1022 continuously receives the first data frame as the error data frame, which can improve the efficiency of the receiving end 102 in determining the interference frequency point.
As yet another alternative embodiment, the first set of interfering frequency points comprises target interference frequency points, the method further comprising: when the number of times that the target interference frequency point is added into the first interference frequency point set is smaller than a third threshold value, the receiving end moves the target interference frequency point out of the first interference frequency point set after a first period of time, wherein the first period of time is the time that the target interference frequency point stays in the first interference frequency point set; when the number of times that the target interference frequency point is added into the first interference frequency point set is larger than or equal to a third threshold value, the receiving end moves the target interference frequency point out of the first interference frequency point set after a second period of time, wherein the second period of time is the time that the target interference frequency point stays in the first interference frequency point set, and the second period of time is larger than the first period of time. The third threshold value refers to the maximum number of times that the target interference frequency point is added into the first interference frequency point set; the target interference frequency point is any one frequency point in the working frequency point set.
When the number of times that the target interference frequency point joins the first interference frequency point set is smaller than the third threshold value, the target interference frequency point is described as a non-serious interference frequency point, and the main channel 1022 of the receiving end 102 controls the target interference frequency point to stay in the first interference frequency point set for a short time (i.e. a first period) without participating in the communication work; when the number of times that the target interference frequency point is added to the first interference frequency point set is greater than or equal to the third threshold value, the target interference frequency point is a serious interference frequency point, and the main channel 1022 controls the target interference frequency point to stay in the first interference frequency point set for a long time (i.e. a second period) without participating in communication work.
For example, the target interference frequency point is an operating frequency point F3, the third threshold is 2, the first period is 5 minutes, the second period is 30 minutes, the number of times that the operating frequency point F3 is determined by the main channel 1022 as an interference frequency point is 2, that is, the operating frequency point F3 is added to the first interference frequency point set for the second time, at this time, the main channel 1022 determines that the operating frequency point F3 is a serious interference frequency point, and controls the operating frequency point F3 to stay in the first interference frequency point set for 30 minutes (that is, the second period), that is, controls the operating frequency point F3 to stop the communication operation for a long time (that is, within 30 minutes) so as to avoid affecting the reliability of wireless communication data transmission due to the external interference of the operating frequency point F3; after 30 minutes, the main channel 1022 moves the working frequency point F3 out of the first interference frequency point set, and lets the working frequency point F3 continue to participate in the communication work again, so as to further observe whether the working frequency point F3 is still interfered by the outside.
For another example, the target interference frequency point is an operating frequency point F4 corresponding to the first data frame, the third threshold is 2, the first period is 3 minutes, the second period is 30 minutes, the number of times that the operating frequency point F4 is determined by the main channel 1022 as the interference frequency point is 1 (smaller than the third threshold), that is, the operating frequency point F4 is added to the first interference frequency point set for the first time, at this time, the main channel 1022 determines that the operating frequency point F4 is a non-serious interference frequency point, and controls the operating frequency point F4 to stay in the first interference frequency point set for 3 minutes (that is, the first period), that is, controls the operating frequency point F4 to stop the communication operation in a short time (that is, within 3 minutes); after 3 minutes, the main channel 1022 moves the working frequency point F4 out of the first interference frequency point set, and lets the working frequency point F4 continue to participate in the communication work again, so as to further observe whether the working frequency point F4 is still interfered by the outside.
In this embodiment, when the target scrambling frequency is a non-severe scrambling frequency, the main channel 1022 of the receiving end 102 stops the operation of the target scrambling frequency for a short time (i.e. the first period); when the target scrambling frequency point is a severe scrambling frequency point, the main channel 1022 stops the target scrambling frequency point for a long time (i.e., a second period). The main channel 1022 determines whether the target interference frequency point is a serious interference frequency point according to the number of times that the target interference frequency point joins the first interference frequency point set, and adjusts the communication stopping time (i.e. the time that the target interference frequency point stays in the first interference frequency point set) according to the severity of the target interference frequency point, so as to ensure that all the working frequency points currently participating in communication are frequency points not interfered by the outside, thereby improving the reliability of wireless communication data transmission.
S203, the receiving end receives signals through the auxiliary channel.
As shown in fig. 1, the receiving end 102 receives a signal corresponding to a preset frequency point set through an auxiliary rf module of the rf input module 1021; the auxiliary radio frequency module demodulates and analog-to-digital converts the received signal to generate second digital data, and sends the second digital data to the auxiliary channel 1023. The auxiliary channel 1023 determines whether the scanning frequency point corresponding to the second digital data is an interference frequency point according to the receiving condition of the second digital data, and stores the scanning frequency point determined as the interference frequency point in the first interference frequency point set.
In each scanning period, the auxiliary channel 1023 scans each frequency point in the preset frequency point set, and determines which frequency points in the preset frequency point set belong to the interference frequency point. For example, the working scanning frequency band is 512MHz (for example, 100MHz to 611 MHz), the information bandwidth of the working frequency point is 1MHz, the residence time of each scanning frequency point is 10ms, and the number of frequency points of the preset frequency point set is 512 (i.e., 512MHz/1 MHz). The auxiliary channel 1023 adopts equal frequency intervals (namely the information bandwidth of the working frequency points) to scan each frequency point in the preset frequency point set at a constant speed, and the residence time of each scanned frequency point is the same; the residence time refers to the residence time of the auxiliary channel 1023 at each scanning frequency point; the dwell time is greater than the frequency hopping time interval of the frequency hopping module, in order that the secondary channel 1023 can detect a complete frame structure (e.g., a complete first data frame); the scanning period is the product of the number of frequency points of a preset frequency point set and the residence time of each scanning frequency point; for example, the number of frequency points in the preset frequency point set is 512, the residence time of each scanning frequency point is 10ms, and the scanning period is 5120ms.
As shown in fig. 4, the working scan frequency band is 512MHz (for example, 100MHz to 611 MHz), the information bandwidth of the working frequency points is 1MHz (i.e., the residence time of each scan frequency point is 10ms, the number n of frequency points of the preset frequency point set is 512 (i.e., 512MHz/1 MHz), the scan period is 5120ms, the preset frequency point set= { f1=100 MHz, f2=101 MHz, f3=102 MHz, f4=103 MHz, f5=104 MHz, f6=105 MHz, … …, fn-1=610 MHz, fn=611 MHz }; as shown by the arc arrow in fig. 4, the secondary channel 1023 starts scanning from the first starting frequency point f1=100 MHz until the last frequency point fn=611 MHz in the preset frequency point set is scanned, and each frequency point stays for 10ms.
S204, the receiving end determines a second interference frequency point set according to the receiving condition of the signal.
As shown in fig. 1, the receiving end 102 receives a signal corresponding to a preset frequency point set through an auxiliary rf module of the rf input module 1021; the main rf module demodulates and analog-to-digital converts the received signal to generate second digital data, and sends the second digital data to the auxiliary channel 1023. The auxiliary channel 1023 determines whether the scanning frequency point corresponding to the second digital data is an interference frequency point according to the receiving condition of the second digital data, and stores the scanning frequency point determined as the interference frequency point in the second interference frequency point set. The Analog-to-Digital conversion processing process is that the signal passes through a radio frequency filter with a scanning frequency point (for example, 213MHz in a preset frequency point set) as a center and then is subjected to Analog Digital (AD) sampling to obtain second Digital data; wherein the sampling frequency of the AD samples follows the nyquist sampling theorem: the sampling frequency is greater than or equal to 2 times of the frequency point information bandwidth. The auxiliary radio frequency module sends the second digital data to the auxiliary channel 1023, and the auxiliary channel 1023 further judges the second digital data to determine whether a scanning frequency point corresponding to the second digital data is an interference frequency point.
The receiving conditions of the signals include: at least one of signal strength, signal correlation peak value, signal amplitude mean value and signal amplitude mean square value, wherein the signal strength refers to the energy of a signal, the signal correlation peak value refers to the maximum convolution value obtained after convolution calculation of the signal and a training sequence, the signal amplitude mean value refers to the value obtained by averaging the signal amplitude, and the signal amplitude mean square value refers to the value obtained by averaging the signal amplitude; for example, the signal receiving condition includes signal strength and signal amplitude average value, when the signal strength is smaller than the strength threshold value, and when the signal amplitude average value is greater than or equal to the amplitude threshold value, the receiving end determines that the scanning frequency point corresponding to the signal does not belong to the second interference frequency point set; when the signal strength is greater than or equal to the strength threshold, and when the signal amplitude mean value is smaller than the amplitude threshold, the receiving end determines that the frequency point corresponding to the signal belongs to the second interference frequency point set.
For example, as shown in fig. 1, the auxiliary radio frequency module modulates and performs analog-to-digital conversion on the received signal to generate second digital data, and sends the second digital data to the auxiliary channel 1023, and the auxiliary channel 1023 calculates the signal intensity and the signal amplitude average value of the second digital data; when the signal intensity of the second digital data is smaller than the intensity threshold value, and when the signal amplitude mean value of the second digital data is larger than or equal to the amplitude threshold value, the auxiliary channel 1023 determines that the scanning frequency point corresponding to the signal is a non-interference frequency point, that is, the scanning frequency point corresponding to the signal is not stored in the second interference frequency point set; when the signal intensity of the second digital data is greater than or equal to the intensity threshold, and when the signal amplitude mean value of the second digital data is smaller than the amplitude threshold, the auxiliary channel 1023 determines that the scanning frequency point corresponding to the signal is an interference frequency point, and stores the scanning frequency point corresponding to the signal in the second interference frequency point set.
As an optional embodiment, the receiving condition of the signal includes a signal strength and a signal correlation peak, and the receiving end determines the second interference frequency point set according to the receiving condition of the signal, including: when the signal strength is smaller than the strength threshold value, and when the signal correlation peak value is larger than or equal to the correlation threshold value, the receiving end determines that the frequency point corresponding to the signal does not belong to the second interference frequency point set; when the signal strength is greater than or equal to the strength threshold, and when the signal correlation peak value is smaller than the correlation threshold, the receiving end determines that the frequency point corresponding to the signal belongs to the second interference frequency point set.
For example, as shown in fig. 1, the auxiliary radio frequency module modulates and performs analog-to-digital conversion on the received signal to generate second digital data, and sends the second digital data to the auxiliary channel 1023, and the auxiliary channel 1023 calculates the signal strength and the signal correlation peak value of the second digital data; when the signal strength of the second digital data is smaller than the strength threshold, and when the signal correlation peak value of the second digital data is larger than or equal to the correlation threshold, the auxiliary channel 1023 determines that the scanning frequency point corresponding to the signal is a non-interference frequency point, that is, the scanning frequency point corresponding to the signal is not stored in the second interference frequency point set; when the signal intensity of the second digital data is greater than or equal to the intensity threshold, and when the signal correlation peak value average value of the second digital data is smaller than the correlation threshold, the auxiliary channel 1023 determines that the scanning frequency point corresponding to the signal is an interference frequency point, and stores the scanning frequency point corresponding to the signal in the second interference frequency point set.
Each frequency point in the preset frequency point set corresponds to a training sequence, the training sequence stores a share (for example, is stored in a random access memory of the auxiliary channel 1023) in the receiving end 102, when the auxiliary channel 1023 calculates a signal correlation peak value of the second digital data, the training sequence of the scanning frequency point corresponding to the second digital data is called from a previously stored area (for example, a random access memory), and the second digital data and the corresponding training sequence are subjected to correlation calculation to obtain the signal correlation peak value. For example, the training sequence of the scanning frequency point corresponding to the second digital data is taken out from the random access memory to be p m And the training sequence p m The length of the second digital data is L, normalization operation is carried out according to the formula (1), and then correlation operation is carried out on the second digital data and the training sequence, so as to obtain the maximum value R of the correlation amplitude max . The normalization calculation formula is as follows:
Figure BDA0003605522080000151
wherein r is m,q Representing the normalized received signal (m representing a single symbol in the training sequence, q representing the oversampling factor, rx m，q Is a sampling receiving signal of the AD conversion chip; the accumulated length of the correlation operation formula is the training sequence length L, and the correlation operation formula is shown in the formula (2):
Figure BDA0003605522080000152
wherein p is m Is a training sequence, r m,q Representing the received signal (m representing a single symbol in the training sequence and q representing the oversampling factor). The correlation threshold may be L/2 because the ideal signal correlation peak is equal to the length value L of the correlation sequence.
In the residence time of the scanning frequency point corresponding to the second digital data, the auxiliary channel 1023 sums the energy of the second digital data according to the formula (3), so as to obtain the signal strength Q of the second digital data, where the formula (3) is as follows:
Figure BDA0003605522080000153
where FL is the number of intra analog-to-digital conversion samples, r n Is the sampled value in the second digital data,
in this embodiment, compared with the case that the receiving end 102 determines whether the frequency point corresponding to the signal (i.e., the frequency point in the preset frequency point set) is the interference frequency point only according to the signal strength or the signal correlation peak value, in this embodiment, the auxiliary channel 1023 of the receiving end 102 determines whether the frequency point corresponding to the signal is the interference frequency point according to the signal strength and the signal correlation peak value together, which further improves the accuracy of the receiving end 102 in judging the interference frequency point.
As another optional embodiment, when the number of the frequency points of the first interference frequency point set is smaller than the number threshold, the receiving end increases the intensity threshold according to the first rule; when the number of the frequency points of the first interference frequency point set is larger than or equal to the number threshold value, the receiving end reduces the intensity threshold value according to the second rule.
For example, as shown in fig. 1, when the number of frequency points of the first interference frequency point set is smaller than the number threshold, it is indicated that the number of interference frequency points determined by the main channel 1022 from the working frequency point set is smaller, and it is also indicated that the number of interference frequency points scanned by the auxiliary channel 1023 from the preset frequency point set is too large, which may cause the reduction of the working frequency points; at this time, the secondary channel 1023 needs to increase the intensity threshold according to the first rule, so as to reduce the number of interference frequency points scanned by the secondary channel 1023 from the preset frequency point set. When the number of the frequency points of the first interference frequency point set is greater than or equal to the number threshold, the number of the interference frequency points determined by the main channel 1022 from the working frequency point set is more, and meanwhile, the number of the interference frequency points scanned by the auxiliary channel 1023 from the preset frequency point set is too small, so that part of interference frequency points are not scanned; at this time, the secondary channel 1023 needs to decrease the intensity threshold according to the second rule to increase the number of interference frequency points scanned by the secondary channel 1023 from the preset frequency point set.
In this embodiment, the auxiliary channel 1023 timely adjusts the auxiliary channel 1023 to determine the intensity threshold of the interference frequency point according to the number of the first interference frequency point set, so as to avoid the auxiliary channel 1023 from removing too many or too few frequency points in the preset frequency point set; the method can ensure that the wireless communication has enough working frequency points, can avoid the condition of communication interruption, and can ensure that the working frequency points participating in the wireless communication are all undisturbed frequency points so as to improve the reliability of wireless communication data transmission.
As yet another alternative embodiment, the first rule includes: intensity threshold Q d Positively correlated with the number of intra analog-to-digital conversion samples FL, Q d And maximum noise power value P n Positive correlation, and Q d Is inversely related to the number Size (a) of the frequency points of the first interference frequency point set.
Optionally, the maximum noise power value P n The determining method of (1) comprises the following steps: the receiving end determines the minimum Signal-Noise Ratio (SNR) of demodulation according to the modulation mode used by the main channel, and calculates the maximum error vector amplitude of normal received framesError Vector Magnitude, EVM) corresponding to the statistical average value P of the signal power values s Then calculate the maximum noise power value P according to the formula (4) n The above formula (4) is as follows:
Figure BDA0003605522080000161
for example, according to equation (4),
Figure BDA0003605522080000162
maximum noise value P n ＝P s /3.1623。
Optionally, the method for determining the intra analog-to-digital conversion sampling number FL includes: the product of the length and the sampling multiple of the first digital data obtained after the first data frame is subjected to analog-digital conversion; for example, the length of the first digital data is 2048, the sampling rate is 56MHz, the frequency point information bandwidth is 1MHz, and if the sampling multiple=the sampling frequency/the frequency point information bandwidth=56 MHz/1 mhz=56, the intra-frame analog-to-digital conversion sampling number fl=2048x56= 114688.
Illustratively, as shown in fig. 1, the secondary channel 1023 adjusts the intra-frame analog-to-digital conversion sample number FL, the maximum noise power value P n And at least one of the number of frequency points Size (A) of the first interference frequency point set is changed to adjust the intensity threshold Q d Is increased or decreased. For example, after the SNR, the data frame structure and the sampling multiple are determined, the intra-frame analog-to-digital conversion sampling number FL and the maximum noise power value P n The secondary channel 1023 adjusts the intensity threshold Q according to the number of frequency points Size (a) of the first set of interference frequency points, which is usually fixed d The method comprises the steps of carrying out a first treatment on the surface of the If the more the number of frequency points Size (A) of the first interference frequency point set is, the less the interference frequency points scanned by the auxiliary channel 1023 from the preset frequency point set are, and a plurality of interference frequency points are not removed, the auxiliary channel 1023 controls the intensity threshold Q d Reducing, so that the auxiliary channel 1023 scans the interference frequency points which are missed before from the preset frequency point set as much as possible; if the smaller the number of frequency points Size (A) of the first interference frequency point set is, the more interference frequency points scanned by the auxiliary channel 1023 from the preset frequency point set are indicated and a plurality of non-interference frequency points are also removed, thenSecondary channel 1023 controls intensity threshold Q d And increasing so that the auxiliary channel 1023 recovers the non-interference frequency points which are removed before from the preset frequency point set. It can be seen that the secondary channel 1023 adjusts the intensity threshold Q according to the frequency bin number Size (a) of the first interference frequency bin set d Not only can ensure that the wireless communication has enough working frequency points, but also can ensure that the working frequency points participating in the wireless communication are all non-interference frequency points, thereby improving the reliability of the wireless communication.
As yet another alternative embodiment, the first rule is:
Figure BDA0003605522080000171
in which Q d As the intensity threshold, size (A) is the number of frequency points of the first interference frequency point set, FL is the number of intra-frame analog-to-digital conversion samples, and P n And N is the number of frequency points of a preset frequency point set, and M is a positive number which is more than 0 and less than 1. For example, the number of frequency points n=512, size (a) =40, m=0.1, n×m=512×0.1=51.2 of the preset frequency point set, and since Size (a) =40 is smaller than 51.2 (i.e., n×m), the auxiliary channel 1023 can adjust the intensity threshold Q using formula (3) d So that the secondary channel 1023 can be based on the newly adjusted intensity threshold Q d And scanning the interference frequency points from the preset frequency point set.
As yet another alternative embodiment, the second rule includes: intensity threshold Q d Positively correlate with FL, and Q d And P n Positive correlation.
Illustratively, as shown in fig. 1, the secondary channel 1023 converts the sample number FL and the maximum noise power value P by adjusting the intra-frame analog-to-digital conversion n To adjust the intensity threshold Q d Is increased or decreased. For example, when the SNR and the data frame structure are determined, the maximum noise power value P n The secondary channel 1023 adjusts the intensity threshold Q by adjusting the intra analog-to-digital conversion sample number FL (e.g., adjusting the sampling multiple) without change d Is increased or decreased. If the number of frequency points Size (A) of the first interference frequency point set is larger, the auxiliary channel 102 is described3 the interference frequency points scanned from the preset frequency point set are too few and many interference frequency points are not removed, the auxiliary channel 1023 can reduce the sampling multiple to reduce the intra-frame analog-to-digital conversion sampling number FL, thereby reducing the intensity threshold Q d So that the auxiliary channel 1023 scans the previous missed interference frequency points from the preset frequency point set as much as possible; if the smaller the number Size (a) of the frequency points of the first interference frequency point set is, the more interference frequency points scanned by the auxiliary channel 1023 from the preset frequency point set are indicated and a plurality of non-interference frequency points are also removed, the auxiliary channel 1023 can increase the sampling multiple to increase the intra-frame digital conversion sampling number FL, thereby increasing the intensity threshold Q d So that the secondary channel 1023 recovers the previously removed non-interference frequency points from the preset frequency point set. From this, the auxiliary channel 1023 of the receiving end 102 adjusts the intensity threshold Q according to the frequency point Size (a) of the first interference frequency point set d Not only can ensure that the wireless communication has enough working frequency points, but also can ensure that the working frequency points participating in the wireless communication are all non-interference frequency points, thereby improving the reliability of the wireless communication.
As yet another alternative embodiment, the second rule is:
Figure BDA0003605522080000172
in which Q d For the intensity threshold, FL is the number of intra-frame analog-to-digital conversion samples, P n And N is the number of frequency points of a preset frequency point set, and M is a positive number which is more than 0 and less than 1. For example, the number of frequency points n=512, size (a) =150, m=0.1, n×m=512×0.1=51.2 of the preset frequency point set, and since Size (a) =150 is greater than 51.2 (i.e., n×m), the auxiliary channel 1023 can adjust the intensity threshold Q using equation (4) d So that the secondary channel 1023 can be based on the newly adjusted intensity threshold Q d And scanning the interference frequency points from the preset frequency point set.
S205, the receiving end determines a working frequency point set according to the first interference frequency point set and the second interference frequency point set, wherein the working frequency point set is a frequency point set after the preset frequency point set is used for removing the first interference frequency point set and the second interference frequency point set.
Illustratively, as shown in fig. 1, after each scanning period is finished, the receiving end 102 determines the set of operating frequency points through the interference fusion module 1024; the interference fusion module 1024 obtains a first interference frequency point set and a second interference frequency point set, and obtains a fusion interference frequency point set by combining the first interference frequency point set and the second interference frequency point set; the interference fusion module 1024 eliminates each interference frequency point in the fused interference frequency point set from the preset frequency point set to obtain a working frequency point set. For example, the preset frequency point set= {101mhz,102mhz,103mhz,104mhz,105mhz,106mhz,107mhz,108mhz,109mhz,110mhz }, the first interference frequency point set= {101mhz,102mhz }, the second interference frequency point set= {102mhz,107mhz,110mhz }, the fused interference frequency point set= {101mhz,102mhz,107mhz,110mhz }, and the operating frequency point set= {103mhz,104mhz,105mhz,106mhz,108mhz,109mhz }.
S206, the receiving end sends the working frequency point set to the sending end.
For example, as shown in fig. 1, after each scanning period, the auxiliary channel 1023 of the receiving end 102 may send the working frequency point set to the skip control module of the receiving end 101 through the feedback link at regular time, and the transmitting end 101 performs wireless communication data transmission according to the working frequency point set.
In summary, the receiving end scans the condition that signals of different frequency points in the preset frequency point set are interfered by the outside through the auxiliary channel at fixed time, determines a second interference frequency point set according to the interference condition, and judges whether the corresponding working frequency point is interfered by the outside through the first data frame received by the main channel to determine a first interference frequency point set; and finally, the receiving end eliminates the first interference frequency point set and the second interference frequency point set from the preset frequency point set to obtain a working frequency point set which is not interfered by the outside, so that the receiving end can conveniently transmit wireless communication data according to the working frequency point set. Therefore, compared with the existing method that the receiving end performs wireless communication frequency point elimination through the high-complexity adaptive filter, the method for performing interference frequency point elimination on the wireless communication frequency points of the receiving end by adopting the double-receiving channels in the design of the wireless communication system not only reduces the design complexity of the wireless communication system, but also improves the reliability of wireless communication data transmission.
For ease of understanding, the following describes the procedure steps for recovering the interference frequency points from the first set of interference frequency points in connection with fig. 5:
(1) The main channel of the receiving end detects whether the frequency point recovery time of the interference frequency point X in the first interference frequency point set is larger than zero.
(2) The frequency point recovery time of several scrambling points X is equal to 0, which indicates that the interfering frequency point X has been removed from the first set of interfering frequency points.
(3) The frequency point recovery time of a plurality of scrambling points X is more than 0, which indicates that the interference frequency point X does not reach the time of being removed from the first interference frequency point set; when the frequency point recovery time of the interference frequency point X decreases to 0, the main channel removes the interference frequency point X from the first interference frequency point set, and sets the continuous interference frequency point mark corresponding to the interference frequency point X to 1, so that the main channel knows whether the interference frequency point is confirmed to be the interference frequency point before.
For easy understanding, the following describes the method flow steps for the secondary channel to determine the interference scrambling point in conjunction with fig. 6:
(1) After the auxiliary channel receives the first digital data sent by the auxiliary radio frequency module, acquiring a training sequence corresponding to the first digital data from a Random Access Memory (RAM), and performing correlation operation on the training sequence and the first digital data to obtain a correlation value R max (i.e., signal correlation peaks).
(2) The secondary channel calculates the signal strength Q (i.e., the total energy Q) of the first digital data.
(3) When the correlation value R max And when the signal intensity Q is smaller than the correlation threshold and is larger than the intensity threshold, the auxiliary channel determines that the scanning frequency point F corresponding to the first digital data is an interference frequency point, and stores the scanning frequency point F in a second interference frequency point set.
(4) When the correlation value R max Neither signal strength Q satisfies: correlation value R max And when the signal intensity Q is smaller than the correlation threshold value and is larger than the intensity threshold value, the auxiliary channel determines that the scanning frequency point F is a non-interference frequency point, and at the moment, the scanning frequency point F is not stored in the second interference frequency point set.
For ease of understanding, the method flow steps for main channel detection of interference scrambling points are described below in connection with fig. 7:
(1) The main channel receives digital data D1 corresponding to a data frame X sent by a main radio frequency module, wherein a working frequency point corresponding to the data frame X is F1; the main channel calculates the CRC of the digital data D1 (i.e., the CRC of the data frame X) and judges whether the CRC of the data frame X coincides with the CRC calculated before the data frame X is not transmitted.
(2) If the two values are inconsistent, the receiving counter of the working frequency point F1 is increased by 1, and the receiving counter of the working frequency point F1 is increased by 1; when the CRC values of the data frames X which are continuously transmitted twice by the working frequency point F1 are inconsistent with the CRC values calculated before the data frames X are not transmitted, the main channel directly judges that the working frequency point F1 is an interference frequency point, and the working frequency point F1 is moved into a first interference frequency point set; if the CRC value of the data frame X calculated by the main channel is consistent with the CRC value calculated before the data frame X is not sent, the main channel determines that the working frequency point F1 is a non-interference frequency point, and meanwhile, the error receiving counter corresponding to the working frequency point F1 is not operated.
(3) If the ratio of the value of the error receiving counter of the working frequency point F1 to the value of the error receiving counter of the working frequency point F1 is greater than or equal to a first threshold value, the main channel judges that the working frequency point F1 is an interference frequency point, and the working frequency point F1 is moved into a first interference frequency point set; if the main channel detects that the continuous interference frequency point mark corresponding to the working frequency point F1 is 0, the main channel sets the frequency point recovery time T1 = first period corresponding to the working frequency point F1; if the continuous interference frequency point mark corresponding to the working frequency point F1 is detected to be 1, the main channel sets the frequency point recovery time t1=second period corresponding to the working frequency point F1.
(4) The frequency point recovery time T1 is reduced by 1 in each timing period (the time recorded by the internal timer of the receiving end) until the time is reduced to zero; when the main channel detects that the frequency point recovery time T1 is zero, the main channel removes the working frequency point F1 from the first interference frequency point set, sets a continuous interference frequency point mark corresponding to the working frequency point F1 to 1, and clears a reception counter and an error reception counter of the working frequency point F1.
(5) When the data frame Y is received again at the working frequency point F1, the main channel adopts the same method for judging the CRC value of the data frame X to judge whether the CRC of the data frame Y is consistent with the CRC calculated before the data frame Y is not sent; if the working frequency point F1 is inconsistent and meets the condition of being determined as the interference frequency point, the main channel moves the working frequency point F1 into a first interference frequency point set, and detects whether a continuous interference frequency point mark corresponding to the working frequency point F1 is 1 or not; if the detected continuous interference frequency point mark is 1, which indicates that the frequency point interference exists all the time and belongs to a serious interference point, setting the frequency point recovery time corresponding to the working frequency point F1 as a second period. If the two adjacent frequency points are consistent, the main channel clears the continuous interference frequency point marks of the working frequency point F1, and clears the first counter and the second counter corresponding to the working frequency point F1.
Fig. 8 shows a schematic structural diagram of an electronic device provided in the present application. The dashed line in fig. 8 indicates that the unit or the module is optional. The electronic device 800 may be used to implement the methods described in the method embodiments described above. The electronic device 800 may be a server or a chip.
The electronic device 800 includes one or more processors 801, which one or more processors 801 may support the electronic device 800 to implement the method of the corresponding method embodiment of fig. 1. The processor 801 may be a general purpose processor or a special purpose processor. For example, the processor 801 may be a central processing unit (Central Processing Unit, CPU). The CPU may be used to control the electronic device 800, execute software programs, and process data of the software programs. The electronic device 800 may also include a communication unit 805 to enable input (reception) and output (transmission) of signals.
For example, the electronic device 800 may be a chip, the communication unit 805 may be an input and/or output circuit of the chip, or the communication unit 805 may be a communication interface of the chip, which may be an integral part of the electronic device.
For another example, the communication unit 805 may be a transceiver of the electronic device 800, or the communication unit 805 may be a transceiver circuit of the electronic device 800.
Electronic device 800 may include one or more memories 802 having programs 804 stored thereon, the programs 804 being executable by processor 801 to generate instructions 803, such that processor 801 performs the methods described in the method embodiments described above in accordance with instructions 803. Optionally, the memory 802 may also have data stored therein. Optionally, processor 801 may also read data stored in memory 802, which may be stored at the same memory address as program 804, or which may be stored at a different memory address than program 804.
The processor 801 and the memory 802 may be provided separately or may be integrated together, for example, on a System On Chip (SOC) of an electronic device.
The specific way in which the processor 801 performs the method of detecting the interference frequency point may be found in the relevant description of the method embodiments.
It should be understood that the steps of the above-described method embodiments may be accomplished by logic circuitry in the form of hardware or instructions in the form of software in the processor 801. The processor 801 may be a CPU, digital signal processor (Digital Signal Processor, DSP), field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device such as discrete gates, transistor logic, or discrete hardware components.
The present application also provides a computer program product which, when executed by the processor 801, implements the method described in any of the method embodiments of the present application.
The computer program product may be stored in a memory 802, such as program 804, with the program 804 ultimately being converted into an executable object file that can be executed by the processor 801 via preprocessing, compiling, assembling, and linking processes.
The present application also provides a computer readable storage medium having stored thereon a computer program which, when executed by a computer, implements a method according to any of the method embodiments of the present application. The computer program may be a high-level language program or an executable object program.
Such as memory 802. The memory 802 may be volatile memory or nonvolatile memory, or the memory 802 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic random access memory (DynamicRAM, DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate Synchronous dynamic random access memory (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and Direct memory bus RAM (DRRAM).
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working processes and technical effects of the apparatus and device described above may refer to corresponding processes and technical effects in the foregoing method embodiments, which are not described in detail herein.
In several embodiments provided in the present application, the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, some features of the method embodiments described above may be omitted, or not performed. The above-described apparatus embodiments are merely illustrative, the division of units is merely a logical function division, and there may be additional divisions in actual implementation, and multiple units or components may be combined or integrated into another system. In addition, the coupling between the elements or the coupling between the elements may be direct or indirect, including electrical, mechanical, or other forms of connection.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with other technical solutions, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and all the modifications or replacements are included in the protection scope of the present application.

Claims (8)

1. A method of detecting a scrambling point, the method comprising:
the receiving end receives a first data frame from the transmitting end through a main channel;
when the receiving condition of the first data frame meets the error data frame judging condition, the receiving end adds 1 to the value of a first counter, and adds 1 to the value of a second counter, wherein the first counter is used for recording the number of the received error data frames, and the second counter is used for recording the number of all the received data frames;
when the value of the second counter is equal to a preset value, and when the ratio of the value of the first counter to the preset value reaches or exceeds a first threshold value, the receiving end determines that the frequency point transmitting the first data frame belongs to a first interference frequency point set;
the receiving end receives signals through an auxiliary channel;
when the signal strength is smaller than the strength threshold value, and when the signal correlation peak value is larger than or equal to the correlation threshold value, the receiving end determines that the frequency point corresponding to the signal does not belong to the second interference frequency point set;
when the signal strength is greater than or equal to the strength threshold, and when the signal correlation peak value is smaller than the correlation threshold, the receiving end determines that the frequency point corresponding to the signal belongs to the second interference frequency point set;
The receiving end determines a working frequency point set according to the first interference frequency point set and the second interference frequency point set, wherein the working frequency point set is a frequency point set after the first interference frequency point set and the second interference frequency point set are removed by a preset frequency point set;
the receiving end sends the working frequency point set to the sending end.
2. The method as recited in claim 1, further comprising:
when the number of the frequency points of the first interference frequency point set is smaller than a quantity threshold value, the receiving end increases the intensity threshold value according to a first rule;
and when the number of the frequency points of the first interference frequency point set is greater than or equal to the number threshold, the receiving end reduces the intensity threshold according to a second rule.
3. The method of claim 2, wherein the first rule comprises:
the intensity thresholdQ d And the number of samples converted from the intra-frame numberFLPositive correlation of theQ d And maximum noise power valueP n Positive correlation, and theQ d The number of frequency points of the first interference frequency point setSize（A）And (5) negative correlation.
4. The method of claim 2, wherein the second rule comprises:
the intensity thresholdQ d And (3) withFLPositive correlation, and the Q d And (3) withP n Positive correlation.
5. The method according to any one of claims 1 to 4, wherein the receiving end determines a first set of interference frequency points according to a reception situation of the first data frame, including:
when the receiving condition of the first data frame meets the error data frame judging condition, the receiving end adds 1 to the value of a third counter, and the third counter is used for recording the number of the continuously received error data frames;
and when the number of the third counters reaches or exceeds a second threshold, the receiving end determines that the frequency point transmitting the first data frame belongs to the first interference frequency point set.
6. The method of any of claims 1-4, wherein the first set of interfering frequency points comprises target interference frequency points, the method further comprising:
when the number of times that the target interference frequency point is added into the first interference frequency point set is smaller than a third threshold value, the receiving end moves the target interference frequency point out of the first interference frequency point set after a first period of time, wherein the first period of time is the time that the target interference frequency point stays in the first interference frequency point set;
when the number of times that the target interference frequency point is added into the first interference frequency point set is greater than or equal to the third threshold value, the receiving end moves the target interference frequency point out of the first interference frequency point set after a second period of time, wherein the second period of time is the time that the target interference frequency point stays in the first interference frequency point set, and the second period of time is greater than the first period of time.
7. An electronic device comprising a processor and a memory, the memory for storing a computer program, the processor for calling and running the computer program from the memory, causing the electronic device to perform the method of any one of claims 1 to 6.
8. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when executed by a processor, causes the processor to perform the method of any of claims 1 to 6.
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