基于SOMP方法的分布式MIMO系统载波频偏估计  

Carrier frequency offsets estimation for distributed MIMO system based on SOMP method

作　　者：黄艳艳 彭华[1] HUANG Yanyan;PENG Hua(Information System Engineering College,Information Engineering University,Zhengzhou 450002,China)

机构地区：[1]信息工程大学信息系统工程学院,河南郑州450002

出　　处：《通信学报》2018年第8期133-139,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61401511)~~

摘　　要：首先根据高阶循环累积量的半不变性重新推导了信号和高阶循环累积量之间的关系式,然后利用SOMP方法联合重构出多个接收天线信号的高阶循环累积量,最后通过主要非零高阶循环累积量对应的循环频率和频偏的四倍关系,得到多个发送信号的频偏估计。与现有算法相比,所提算法充分利用接收信号间的相关性,提高了低信噪比下的多频偏估计性能,降低了导频数量。By utilizing the half invariant property of high-order cyclic cumulants,the equation of signals and its high-order cyclic cumulants was rederivated first.Then simultaneous orthogonal matching pursuit(SOMP)method was used to jointly reconstruct multiple receiving signals’high-order cyclic cumulants.At last,according to the fourfold relationship between carrier frequency offsets and cyclic frequencies of main non-zeros high-order cyclic cumulants,multiple transmitting signals’carrier frequency offsets were obtained.Comparing with existing algorithms,the correlation between receiving signals is fully used by the proposed algorithm,the carrier frequency offset estimation performance at low signal to noise is improved and the pilots numbers are reduced.

关 键 词：分布式多输入多输出系统 多载波频偏估计 同步正交匹配追踪 联合重构 

分 类 号：TN911.7[电子电信—通信与信息系统]