Research And Implementatio Of Algorithm For RF Multipath Self-interference Suppression In Full-duplex

With the continuous development of wireless communication technology, full-duplex technology appears on the basis of half-duplex technology. The goal of full-duplex is to enable wireless devices to achieve co-time co-frequence communication, thus improving the spectrum efficiency and transmission rate of wireless communications. But, the main factor affects Full-duplex is the useful signal transmitted from remote end interfered by local transmission signal.Now, there are mainly four ways to cancel self-interference, which are radio resource management, spatial interference suppression, digital interference suppression and RF interference suppression. This paper aims at RF multipath interference suppression to research three algorithms based on gradient descent, stochastic approximation and partial search and simulate the extreme performance and factors of RF multipath interference suppression. Then, achieving algorithms by software program on application layer. Finally, testing and verifying the algorithms on full-duplex devices and analyzing and comparing the test results.Firstly, researching existing self-interference suppression technology and detailed discussing a RF multipath interference suppression algorithm. Then, giving the fundamental of gradient descent algorithm, stochastic approximation algorithm, partial search algorithm and putting forward solutions against RF multipath interference suppression.Secondly, using simulation software to build a simulation environment of RF multipath interference suppression and using the adaptive filter algorithm to simulate the extreme performance. Then, studying the effect factors by the way of changing only a single variable and fixing other variables.Again, based on building hardware and software system environment well, cmpiling control procedures by programming software on application layer. Respectively, achieving gradient descent algorithm, stochastic approximation algorithm and local search algorithm. Emphatically giving the algorithm implementation process and key points.Finally, testing and verifying the three RF multipath interference suppression algorithms. Testing performance of these algorithms under different transmitting power on full-duplex communication device. In conclusion, the RF multipath interference suppression ability of all the three algorithms can achieve about 43 dB. The different is the average convergence time of the three algorithms. From the test results, the convergence rate of stochastic approximation algorithm is fastest.This paper proposes three RF multipath interference suppression algorithms. Research results has been verified by test. Providing theoretical and practical basis for the future research of RF multipath interference suppression technology and Contributing to promote the further development of full-duplex communication mode.