【摘要】 本文提出了一种可用于正交频分复用(OFDM)系统的新型后缀信号-导频后缀(PP:Pilot Postfix),并以此设计了PP-OFDM系统.PP信号由OFDM符号中的导频线性处理生成,它在接收端可以和OFDM符号中的导频相干合并.在此基础上本文给出了PP-OFDM信道估计、以及考虑了信道估值误差的数据符号估计算法.理论分析表明,相对于另外两种OFDM系统中常用的前/后缀信号-循环前缀/补零后缀(CP/ZP),PP信号可以提高信道估计性能.仿真表明,CP/ZP/PP-OFDM分别采用各自的最优导频功率分配参数时,PP-OFDM的误码率最低,这得益于PP-OFDM更好的信道估计性能.PP-OFDM的最优导频功率分配参数应通过二维搜索得到,ZP/PP-OFDM仅有一维参数可优化.更多还原

【Abstract】 A new postfix signal,called "PP"(Pilot Postfix),for Orthogonal Frequency Division Multiplexing(OFDM) system is proposed.PP is formed by linear processing to pilots in OFDM symbol,and can be combined with those pilots in OFDM symbol at receiver.Channel estimation and demodulation algorithm are proposed for PP-OFDM also.Theoretical analysis shows that PP can improve channel estimation performance compared with cyclic prefix/zeros postfix(CP/ZP).Simulation shows that PP-OFDM has lower Bit Error Rate than CP/ZP-OFDM because of better channel estimation performance,when CP/ZP/PP-OFDM have their own optimal pilot power allocation respectively.The optimal power allocation of PP-OFDM can be found by two-dimension searching,while there is only one-dimension needed to optimize for CP/ZP-OFDM.更多还原