CN-122002449-A - Multi-band self-adaptive anti-interference communication relay method and system

CN122002449ACN 122002449 ACN122002449 ACN 122002449ACN-122002449-A

Abstract

The invention is suitable for the technical field of communication of the Internet of things, and provides a multi-band self-adaptive anti-interference communication relay method and a system, in the implementation process of the invention, the high-efficiency monitoring of the spectrum state is realized through a dual-mode scanning mechanism of a multi-band sensing and scanning module, the regular scanning mode ensures the regularity of basic spectrum data acquisition under the clock synchronization of a system relay and a resource management module, the event-triggered scanning mode combines service reliability and decision performance prediction, and starts scanning immediately when the interference burst or spectrum state is possibly deteriorated, and the two modes are cooperated, so that the resource waste of fixed scanning is avoided, the timeliness of interference response is ensured, and the optimal frequency band selection and anti-interference strategy formulation have reliable data support.

Inventors

CHEN LIANG
SHEN YANG
LI FANGHAO
WANG ZHIQIANG
ZHANG YANSONG
YANG KAI
HUANG SHUAI
XU RUI
ZHANG PENG
ZHANG XIONG
ZHOU SHENGHUA
ZHOU PENGWEI

Assignees

中国计量大学

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (12)

1. A method for relaying multi-band adaptive immunity communications, the method comprising: Periodically scanning a plurality of preset communication frequency bands, and determining channel quality parameters including signal-to-noise ratio and spectrum occupancy of each frequency band; Determining the interference level and the interference index of each frequency band according to the channel quality parameters, and determining a decision instruction comprising a target working frequency band and an anti-interference strategy according to the interference level and the interference index; And tuning the receiving and transmitting links to the target working frequency band according to the decision instruction, and applying real-time digital signal processing corresponding to the selected anti-interference strategy to the received signals so as to obtain processed data and analysis results.
2. The method of claim 1, wherein said determining the interference level and the interference index for each frequency band based on the channel quality parameters comprises: the interference index of each frequency band in the channel quality parameters is determined through an analysis algorithm, and the method specifically comprises the following steps: , wherein, Is the first The interference index of the individual frequency bands, Is the first The measured signal-to-noise ratio for each frequency band, Is a preset maximum signal to noise ratio threshold, Is the first The spectrum occupancy of the individual frequency bands, Is the first The success rate of packet transmission in each frequency band, 、、 Is a weight coefficient; by the interference index The values of (2) determine the interference level of each frequency band.
3. The method of claim 1, wherein the determining, by the interference level and interference index, a decision instruction comprising a target operating frequency band and an anti-interference policy comprises: By the formula Determining the priority score of each frequency band, and determining the frequency band with the highest priority score as the target working frequency band, wherein, Is the first The priority score of the individual frequency bands, Is the first The available bandwidth of the individual frequency bands, For a preset maximum bandwidth of the bandwidth, For the purpose of adapting the coefficients for the traffic, 、、 Is a weight coefficient; According to the interference index of the target working frequency band Matching corresponding anti-interference strategies from a pre-stored anti-interference strategy library according to channel characteristics; and generating a corresponding decision instruction through the target working frequency band and the anti-interference strategy.
4. The method of claim 1, wherein after determining the decision instruction comprising the target operating band and the interference rejection strategy from the interference level and the interference index, the method further comprises: By the formula Predicting communication performance index And in determining the communication performance index Less than a preset performance threshold And scanning a plurality of preset communication frequency bands, wherein, For the interference index of the target operating band, For the available bandwidth of the target operating band, For a preset maximum bandwidth of the bandwidth, For a policy score determined based on the tamper resistant policy, And adopting the same strategy for the target working frequency band to obtain historical average communication performance.
5. A multi-band self-adaptive anti-interference communication relay system is characterized by comprising a multi-band sensing and scanning module, an interference analysis and spectrum decision module, a reconfigurable radio frequency front-end module, a self-adaptive signal processing module and a system relay and resource management module; The multi-frequency band sensing and scanning module is used for periodically selecting a scanning mode to scan a plurality of preset communication frequency bands, determining channel quality parameters comprising signal-to-noise ratio and spectrum occupancy rate of each frequency band and uploading the channel quality parameters; The interference analysis and spectrum decision module is used for receiving the channel quality parameters, determining the interference level and the interference index of each frequency band through an analysis algorithm, and generating a decision instruction containing a target working frequency band and an anti-interference strategy according to the interference level and the interference index; The reconfigurable radio frequency front-end module is used for tuning a receiving and transmitting link to the target working frequency band according to the decision instruction; The self-adaptive signal processing module is used for receiving the decision instruction, applying real-time digital signal processing corresponding to the selected anti-interference strategy to the signal received by the reconfigurable radio frequency front end module, and feeding back processed data and analysis results to the system relay and resource management module; the system relay and resource management module is connected with all other modules and is used for providing clock synchronization, power management and network protocol stack support for the whole system and controlling the relay forwarding flow of data.
6. The system of claim 5, wherein the scan pattern of the multi-band sensing and scanning module comprises: a periodic scanning mode, namely triggering a timer in the system relay and resource management module, and scanning all preset frequency bands for one round at fixed time intervals; the event triggering scanning mode is triggered by specific events in time, and comprises reliability triggering and instruction triggering, wherein: when the short-term data packet error rate calculated by the system relay and resource management module exceeds a preset threshold value, immediately generating a trigger signal; and the instruction triggering is that when the interference analysis and spectrum decision module judges that the spectrum state needs to be reevaluated in advance according to the performance prediction of the current decision instruction, a rescanning instruction is sent to the interference analysis and spectrum decision module.
7. The system according to claim 5, wherein the interference analysis and spectrum decision module is connected to the multi-band sensing and scanning module, and receives the channel quality parameters uploaded by the interference analysis and spectrum decision module, and performs quantization classification on the interference level of each frequency band through an analysis algorithm, specifically: , wherein, Is the first The interference index of the individual frequency bands, Is the first The measured signal-to-noise ratio for each frequency band, A maximum signal-to-noise threshold preset for the system, Is the first The spectrum occupancy of the individual frequency bands, Is the first The success rate of packet transmission in each frequency band, 、、 Is a weight coefficient; and then according to the interference index The values of (2) determine the interference level of each frequency band.
8. The system of claim 5, wherein the interference analysis and spectrum decision module is formulated based on the interference level and interference index Determining priority scores for respective frequency bands And then determining the frequency band with the highest priority score as the target working frequency band, wherein, Is the first The available bandwidth of the individual frequency bands, For the maximum bandwidth supported by the system, For the purpose of adapting the coefficients for the traffic, 、、 Is a weight coefficient; According to the interference index of the target working frequency band And matching the channel characteristics with corresponding anti-interference strategies from a pre-stored interference strategy library.
9. The system of claim 5, further comprising a performance index comparison module configured to pass through a formula Predicting communication performance index And in determining the communication performance index Less than a preset performance threshold And when the multi-band sensing and scanning module is instructed to scan a plurality of preset communication bands, wherein, For the interference index of the target operating band, For the available bandwidth of the target operating band, For a preset maximum bandwidth of the bandwidth, For a policy score determined based on the tamper resistant policy, And adopting the same strategy for the target working frequency band to obtain historical average communication performance.
10. The system of claim 5, wherein the reconfigurable rf front-end module comprises a wideband antenna, a feedback unit, an rf switch matrix controlled by the micro-controller unit, a bandwidth programmable analog filter, a low noise amplifier, and a power amplifier, wherein the micro-controller drives the rf switch matrix to gate the corresponding filter path by receiving the target frequency band identifier in the decision instruction, and configures the center frequency and bandwidth, thereby realizing the hardware tuning of the receiving and transmitting links, and feeding back the operating state to the system relay and resource management module through the feedback unit, wherein: the broadband antenna provides a physical interface for receiving and transmitting radio frequency signals; The microcontroller unit receives the decision instruction, analyzes the frequency band center frequency and the bandwidth parameter, and then sends a channel gating instruction to the radio frequency switch matrix through the interface, and simultaneously outputs configuration parameters to the programmable analog filter; the radio frequency switch matrix is a radio frequency relay array, the input end of the radio frequency switch matrix is connected with the broadband antenna, the output end of the radio frequency switch matrix is respectively connected with different paths of the programmable analog filter, and under the control of the microcontroller unit, the filtering paths matched with the target frequency band are gated; the programmable analog filter tunes the center frequency to the center frequency of the target frequency band according to the configuration parameters of the microcontroller unit, and matches the bandwidth with the bandwidth of the target frequency band; The low-noise amplifier group is linked with the channel gating signals of the radio frequency switch matrix, and only when the corresponding frequency band channel is activated, the low-noise amplifier group starts working, so that idle power consumption is reduced; the power amplifier group is connected with the transmitting link, the output power of the power amplifier group is dynamically controlled by the system relay and resource management module according to the link budget, and the power amplifier group is used for analyzing the interference and outputting the interference index by the frequency spectrum decision module When the power is more than 0.6, the output power is automatically increased; The feedback unit is connected with the microcontroller unit, acquires parameters of a current gated frequency band passage, a filter center frequency and an amplifier working state in real time, feeds back the parameters to the system relay and resource management module through the data bus, is used for state monitoring and fault diagnosis, and provides a working frequency band reference of the current radio frequency front end for the multi-frequency band sensing and scanning module.
11. The system of claim 1, wherein the real-time digital signal processing operations in the adaptive signal processing module include narrowband interference suppression processing, strong error correction coding processing; The narrow-band interference suppression processing is used for filtering signals to remove narrow-band interference components within the range of +/-50 kHz of the central frequency when the interference analysis and spectrum decision module judges that the current frequency band is moderate interference; And the strong error correction coding processing is used for starting the LDPC code to carry out coding processing when the interference analysis and spectrum decision module judges that the current frequency band is severely interfered, the coding efficiency is adjusted to be 1/2, and errors in signal transmission are corrected by adding redundant information.
12. The system of claim 5, wherein the system relay and resource management module is time synchronized with the internet of things terminal and other relay nodes, provides a clock reference for periodic scanning of the multi-band sensing and scanning module, outputs a reference clock to the adaptive signal processing module, and dynamically distributes power according to the working state of each module; the network protocol stack supports compatible processing of multiple Internet of things protocols, selects a corresponding protocol stack according to the optimal frequency band output by the interference analysis and spectrum decision module, and provides a protocol interface for the multi-frequency band sensing and scanning module to update a frequency band list; the system relay and resource management module receives the data analysis result fed back by the adaptive signal processing module and the total forwarding data packet number recorded by the system relay and resource management module in real time, calculates the short-term data packet error rate, and is used for triggering the reliability triggering scanning mode of the multi-band sensing and scanning module.

Description

Multi-band self-adaptive anti-interference communication relay method and system Technical Field The application relates to the technical field of communication of the Internet of things, in particular to a multi-band self-adaptive anti-interference communication relay method and system. Background With the deep penetration of the internet of things technology in the fields of industrial control, internet of vehicles, intelligent home furnishing and the like, the number of terminal equipment is exponentially increased, the communication scene is increasingly complex, the internet of things communication relay system is used as core equipment for expanding network coverage and improving transmission reliability, the performance of the system directly determines the operation quality of the whole internet of things, the current internet of things communication frequency band covers a plurality of frequency bands such as Sub-6GHz, millimeter waves and ISM, the interference type difference faced by different frequency bands is obvious, and higher requirements are provided for the anti-interference capability and the frequency band suitability of the relay system. The conventional Internet of things communication relay system has obvious defects in the aspect of multi-band anti-interference, namely, the frequency band sensing and scanning mode is single, fixed period scanning is adopted, quick response is difficult when interference bursts, the system is not linked with the overall state of the system, so that frequency spectrum evaluation is lagged, the interference analysis lacks quantitative indexes, the anti-interference strategy is selected by relying on subjective judgment, accurate matching cannot be realized according to the interference level and the frequency band characteristics, so that the service quality evaluation lacks basis, and the discrete optimization strategy has low resource utilization efficiency and cannot cope with complex interference scenes with multi-dimension and dynamic changes. The method leads to low communication reliability, low spectrum utilization rate and large environmental interference of the traditional relay system under the complex interference environment, and can not meet the requirements of low time delay, high reliability and dynamic scenes of the Internet of things of the industry. Disclosure of Invention In view of this, the present application provides a multi-band adaptive anti-interference communication relay method and system, so as to solve the problems of low communication reliability, low spectrum utilization rate and large interference caused by environmental factors in the complex interference environment of the existing relay system. The first aspect of the present application provides a multi-band adaptive anti-interference communication relay method, which comprises: Periodically scanning a plurality of preset communication frequency bands, and determining channel quality parameters including signal-to-noise ratio and spectrum occupancy of each frequency band; Determining the interference level and the interference index of each frequency band according to the channel quality parameters, and determining a decision instruction comprising a target working frequency band and an anti-interference strategy according to the interference level and the interference index; And tuning the receiving and transmitting links to the target working frequency band according to the decision instruction, and applying real-time digital signal processing corresponding to the selected anti-interference strategy to the received signals so as to obtain processed data and analysis results. Optionally, the determining the interference level and the interference index of each frequency band according to the channel quality parameter includes: the interference index of each frequency band in the channel quality parameters is determined through an analysis algorithm, and the method specifically comprises the following steps: , wherein, Is the firstThe interference index of the individual frequency bands,Is the firstThe measured signal-to-noise ratio for each frequency band,Is a preset maximum signal to noise ratio threshold,Is the firstThe spectrum occupancy of the individual frequency bands,Is the firstThe success rate of packet transmission in each frequency band,、、Is a weight coefficient; by the interference index The values of (2) determine the interference level of each frequency band. Optionally, the determining, by the interference level and the interference index, a decision instruction including a target operating frequency band and an anti-interference policy includes: By the formula Determining the priority score of each frequency band, and determining the frequency band with the highest priority score as the target working frequency band, wherein,Is the firstThe priority score of the individual frequency bands,Is the firstThe available bandwidth of the individual frequ