多接收天线下空时分组码解码算法的研究

Research on decoders for space-time block codes using multi-received antennas

针对时变瑞利衰落信道,提出多接收天线下两种新的空时分组码解码算法。由于多普勒频移和载频偏移,引起信道的时间选择性衰落,信道时间选择性衰落引起发送天线间互干扰(intertransmit antennas interfer-ence,ITAI)。所提方案中信道用一阶自回归模型建立,在多接收天线时,通过分集增益合并(diversity advantagecombiner,DAC)后,采用约束置零或cholesky分解的方法移除发送天线间互干扰。最后针对不同变化系数的衰落信道给出计算机仿真结果,结果表明提出的方案表现出了更好的性能。

Two kinds of new decoders are proposed for space-time block codes using multi received antennas over time-selective Rayleigh fading channel that arise due to Doppler shifts and carrier frequency offsets. Time-selective fading causes the intertransmit antennas interference（ITAI）. Modeling the channel as AR1 autoregressive model, the proposed decoder performs robust performance to remove ITAI by restricted zero-forcing method or cholesky decomposition after diversity advantage combining（DAC） at receiver. The better performance is shown by simulation results presented for various channel-fading rates.