Multiple phase detector of M-ary phase shift keying symbols in code division multiple access systems  

作　　者：QUAN Zhi 

机构地区：[1]Federal University of Juiz de fora, Electrical Engineering, Juiz de fora, MG Brazil Zip

出　　处：《Journal of Central South University》2011年第4期1080-1086,共7页中南大学学报（英文版）

摘　　要：A novel iterative technique, the phase descent search detection was proposed. This technique constrained the solution （PDS） algorithm, for M-ary phase shift keying （M-PSK） symbols to have a unit magnitude and it was based on coordinate descent iterations where coordinates were the unknown symbol phases. The PDS algorithm, together with a descent local search （also implemented as a version of the PDS algorithm）, was used multiple times with different initializations in a proposed multiple phase detector; the solution with the minimum cost was then chosen as the final solution. The simulation results show that for highly loaded multiuser scenarios, the proposed technique has a detection performance that is close to the single-user bound. The results also show that the multiple phase detector allows detection in highly overloaded scenarios and it exhibits near-far resistance. In particular, the detector has a performance that is significantly better, and complexity that is significantly lower, than that of the detector based on semi-definite relaxation.A novel iterative technique,the phase descent search(PDS) algorithm,for M-ary phase shift keying(M-PSK) symbols detection was proposed.This technique constrained the solution to have a unit magnitude and it was based on coordinate descent iterations where coordinates were the unknown symbol phases.The PDS algorithm,together with a descent local search(also implemented as a version of the PDS algorithm),was used multiple times with different initializations in a proposed multiple phase detector;the solution with the minimum cost was then chosen as the final solution.The simulation results show that for highly loaded multiuser scenarios,the proposed technique has a detection performance that is close to the single-user bound.The results also show that the multiple phase detector allows detection in highly overloaded scenarios and it exhibits near-far resistance.In particular,the detector has a performance that is significantly better,and complexity that is significantly lower,than that of the detector based on semi-definite relaxation.

关 键 词：coordinate descent COMPLEXITY M-ary phase shift keying （M-PSK） multiuser detection quadratic optimization semi-definite relaxation 

分 类 号：TN957.51[电子电信—信号与信息处理] TN914.53[电子电信—信息与通信工程]