对色散信道的预编码-判决反馈均衡联合最优设计

本文提出了利用滤波器组预编码及判决反馈均衡对色散信道实现收/发联合最优设计的方法.该方法以最大互信息量为设计准则,在固定发送功率约束条件下得到了新的设计结果.证明了预编码器使频率选择性信道等价为一组独立的平坦衰落子信道,且后向反馈滤波器等价为一条直通子信道,结论表明系统各子信道的信噪比与采用线性均衡结构的结果相比有所增加,从而使系统具有更低的误码率性能.文章通过仿真验证了该结论

Joint Precoders and Decision Feedback Equalizers Optimization Over Dispersive Channels

Optimal FIR transmit filterbanks and non-linear DFE receivers are derived for block-based transmissions over frequency-selective channel.The joint optimization of precoders and equalizers is based on the maximum mutual information criteria subject to fixed transmission power constraint.We get a new result from which the precoder can be interpreted as converting the frequency fading channel into a set of independent flat fading subchannels,and the feedback filter is equivalent to a direct subchannel,thus the SNR of each subchannel is increased and the system has better overall BER performance while maintains all the advantages of Scaglione's optimization.Simulations illustrate the merits of our design.