Multi-user anti-interference channel access system and dynamic spectrum collaborative anti-interference method

Abstract

The invention discloses a multi-user anti-interference channel access system and a dynamic spectrum collaborative anti-interference method. According to the system, a distributed wireless network is considered, a plurality of communication users exist in the network, and the outside of the network is attacked by malicious interference; users in the same conflict domain in the network can judge interference signals at the moment through broadband spectrum sensing, and select communication channels through distributed channel decisions, so that malicious interference is avoided, and same-frequency mutual interference is avoided. The method comprises the following steps: firstly, a communication party observes an interference signal and takes the interference signal as a coordination signal;the own user is guided to select frequency and transmit data according to the coordination signal and the corresponding channel access strategy table; after transmission, a judgment is made whethertransmission succeeds or not according to whether ACK feedback is received or not; and finally, the channel access strategy table is updated according to the transmission condition. The model is complete with clear physical significance and high anti-interference capability so that same-frequency mutual interference is avoided, and the channel transmission efficiency of the distributed wireless network is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication anti-jamming, in particular to a multi-user anti-jamming channel access system and a dynamic spectrum cooperative anti-jamming method. Background technique [0002] With the rapid development of wireless communications, the number of frequency-using devices is increasing explosively, and spectrum resources are gradually becoming scarce. On the one hand, in order to improve the efficiency of spectrum utilization, it is necessary to study more effective channel multiple access methods; on the other hand, in military scenarios, when malicious interference interferes with users’ legitimate signals, the communication coordination between users will be affected by the interference. The existence of the signal is interrupted, which makes it more difficult for multi-user frequency coordination. How to avoid the internal same-frequency mutual interference while resisting the threat of exter...

AI Technical Summary

Problems solved by technology

Under malicious interference conditions, there is usually no reliable centralized controller, and it is difficult to exchange information between communication nodes, and often only distributed decision-making can be made. Therefore, in harsh environments, the problem of distributed frequency selection of communication equipment is an urgent problem to be solved. important question

However, when the available channel status changes, it is difficult for traditional methods to achieve reliable communication through pre-shared frequency hopping codes / spreading codes

[0004] However, there are the following problems in the above research: 1. Usually, the "internal coordination" or "external confrontation" of frequency-using equipment is considered unilaterally, but both are not considered at the same time. In actual systems, especially in military environments, the two It often exists at the same time, and the internal and external coupling relationship is obvious; 2. Existing methods only consider avoiding or countering malicious interference threats, and do not consider "using" interference signals to assist their own users in spectrum coordination; 3. Existing methods usually consider specific interference patterns or style, usually to model the interference signal, but in actual scenarios, it is often very difficult to obtain the information of the interference party

However, it is very difficult to achieve relevant equilibrium in a distributed wireless network under malicious jamming attack

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