单载波块传输系统中基于叠加导频的信道估计与均衡

在单载波分块传输系统中进行频域均衡需要知道精确的信道状态信息,为此本文提出了一种基于叠加的导频序列的迭代信道估计算法,利用叠加的导频序列以及通过迭代均衡检测得到发送数据的估计值来降低信道估计的误差。从理论上分析了该算法所能达到的信道估计误差下限和比特误码率下限,并提出了最优叠加导频序列的设计准则。数值仿真结果表明:采用该算法时系统的比特误码率性能与已知信道信息时的性能差距小于1 dB。

Superimposed pilot based channel estimation and equalization forsingle carrier block transmission

Since frequency domain equalization in single carrier block transmission system requires accurate channel state information,a superimposed sequence based frequency domain iterative channel estimation and equalization algorithm was proposed.The channel estimation error can be reduced by exploiting the knowledge of the pilot sequence and the detected data symbols.Theoretical results of the lower bound of the bit error rate as well as the channel estimation error of the proposed algorithm were given.In addition,a design criterion of optimum pilot sequence was presented.Simulation results show that the performance difference between the proposed method and the case that the channel state information was known at receiver is less than 1 dB.