Research On Probabilistic Full-Duplex Communication Mechanism Of Two-Way Frequency Hopping

Currently,wireless communication spectrum resources are increasingly strained and interference is increasing day by day.How to use various technologies to provide higher spectrum efficiency,faster transmission rate,and stronger anti-jamming capability within a limited spectrum resource is a problem worth studying.Frequency hopping technology has good anti-jamming,anti-fading and anti-interception features,and combining full-duplex(FD)technology with frequency hopping technology can greatly improve spectrum,efficiency because full-duplex(FD)technology allows receiving and transmitting information at the same time and in the same frequency band,which can theoretically increase the spectral efficiency by two times,but the self-interference problem limits its application in frequency hopping systems.And in general,the frequency spectrum of the frequency hopping signal can be extended to several hundred megahertz,making the effect of the self-interference cancellation unsatisfactory.Therefore,this dissertation combines the frequency hopping technology with the full-duplex technology to solve the problem of self-interference,and studies how to perform it in wide hops.A feasible system scheme is designed within the wide frequency bandwidth and the frequency hopping sequence is combined to further enhance the system performance.The main work of this dissertation is as follows:A bi-directional frequency hopping probabilistic full-duplex communication system scheme is studied.Full-duplex(FD)technology requires self-interference cancellation,and the self-interference cancellation capability is affected by the signal bandwidth,but current solutions for ideal self-interference cancellation over a bandwidth of several hundred megabits have not yet been proposed.Based on the above problems,this dissertation proposes a two-frequency hopping full-duplex system scheme,which divides the bandwidth of the self-interfering signal by two frequency hoppings to improve the system's self-interference cancellation ability.The simulation results show that compared with the existing frequency hopping schemes,this scheme can obtain approximately equal error rate when the residual self-interference reaches below the noise floor,but the spectral efficiency can be multiplied.In addition,the scheme introduces a full-duplex mode and a frequency division duplex mode into a frequency hopping system by using a full-duplex probability coefficient based on frequency hopping sequences of both sides of the communication,and establishes a bi-directional frequency hopping probability full-duplex system model.Simulation results show that the scheme can flexibly select the duplex mode according to the level of self-interference cancellation and channel conditions.The performance of the bi-directional frequency hopping probability full-duplex system was analyzed.The BER and detection probability of the system in frequency-division duplex and full-duplex modes are deduced,and the scheme to minimize the system detection probability when the system BER is fixed is studied.The basic idea of this scheme is to establish the optimization problem model first,and then analyze the constraint conditions under the situation of frequency division duplex mode,full duplex mode and full duplex probability coefficient,and finally propose an algorithm to solve the problem.Simulation results show that compared with the existing frequency hopping schemes,the proposed scheme has lower detection probability under the condition of the same solution domain is obtained when the self-interference suppression reaches 100 d B or more.This dissertation also designs a new frequency hopping sequence based on the solution of the optimization problem.Simulation shows that this frequency hopping sequence has better uniformity.