时变MIMO系统的联合符号检测与信道估计

Joint Symbol Detection and Channel Estimation for Time-varying MIMO System

针对MIMO系统时变多径信道,结合分集合并,提出一种带判决反馈的修正混和型MLSE(DF-MHMLSE)为基础的低复杂度联合符号检测与信道估计的递推算法.发送端仅需少量导频符号用于信道估计初始化,在此基础上,针对系统中各MISO子系统,分别采用修正混和型MLSE算法(MHMLSE),形成临时判决符号矢量集合及对应的临时信道矢量集合,最终根据分集合并确定最佳判决符号矢量,同时实现信道矢量的自适应更新.该算法减小了传统MIMO MLSE的计算复杂度,实现了逐符号检测,并取得了较低的误比特率.

A complexity-reduced recursive algorithm of joint channel estimation and data detection based on decision feed- back modified-hybrid-MLSE（DF-MHMKSE）with diversity combining is presented for MIMO time-varying multipath chan- nel.Only a few of pilot symbols are needed for channel estimation initialization,on basis of that, the tentative decision symbol vectors set and tentative channel vectors set are obtained by using modified hybrid MLSE（MHMLSE）to each MISO subsystem respectively. The optimal decision symbol vector is acquired according to diversity combining ultimately, and the channel vectors are adaptively updated. The algorithm greatly reduces the complexity, detects by symbol with lower BER.