Research On Power Allocation And Interference Management Of Relay System

Relay technology is one of the key technologies in 4G and 5G system.The paper mainly forces on power allocation and interference management techniques.Relay system power allocation technology can be divided into single relay system power allocation and multi-relay system power allocation,this paper change the optimal power allocation problem into a convex optimization problem,give the optimal power allocation scheme and the derivation process.After the completion of the study in the power allocation of a single relay system,we extended this problem to multi-relay system.The study of interference management technology in relay system mainly focused on interference management in one-way and two-way relay system.Firstly,we toke interference analysis on one-way and two-way relay system,then we focused on the blind known interference cancellation technique and interference management in multi-user multi-relay system.Blind known interference cancellation technology uses the already known interference symbol to take interference cancellation,the algorithm is adapted to the characteristics of the relay interference network.For multi-user multi-relay interference management techniques,we propose a beamforming and interference alignment transmission mechanism based on optimal relay selection.Simulation results show that this transmission mechanism can get better system capacity performance in different SNR and alternatively relay numbers.This transmission mechanism apply relay selection,beamforming and interference alignment technology into a multi-user multi-relay interference network,effectively suppresses interference in the network,improve the system capacity.