莱斯信道中通用PSAM帧格式的优化设计

Optimization design of generalized PSAM format over Rician channel

针对莱斯信道下导频受限的载波同步系统,研究了相应的数据帧格式的推广与优化设计问题,以提升载波同步能力。首先基于标准导频符号辅助调制(standard pilot-symbol-assisted-modulation,S-PSAM)帧格式,设计了一种通用的PSAM(generalized PSAM,G-PSAM)帧格式,并推导了相应的联合数据辅助与非数据辅助的克拉美罗界(data-aided&non-data-aided Cramer-Rao bound,DA&NDA CRB)及其近似形式;接着利用近似的DA&NDA CRB和经典的控制变量法(control-variate method,CVM)对G-PSAM帧格式进行了优化,得到了一类优化的G-PSAM(optimized G-PSAM,OG-PSAM)帧格式,同时与S-PSAM帧格式进行了比较。仿真结果表明,无论使用短数据包传输还是长数据包传输,不同导频块数下的OG-PSAM帧格式都表现出优于S-PSAM帧格式的估计性能。

Aiming at the carrier synchronization system with limited pilot frequency under Rician channel,the generalization and optimization design of the corresponding data frame format is studied,so as to improve the carrier synchronization ability significantly.Firstly,a generalized PSAM(G-PSAM)format is designed based on the standard pilot-symbol-assisted-modulation(S-PSAM)format,whose corresponding joint data-aided&non-data-aided Cramer-Rao bound(DA&NDA CRB)are derived and approximated.Then,an efficient solution to optimize the G-PSAM format is provided by means of the approximate DA&NDA CRB and the common control-variate method(CVM),resulting in a class of optimized G-PSAM(OG-PSAM)format and meanwhile comparing with the S-PSAM format.Simulation results show that the OG-PSAM format exhibits superior DA&NDA CRB performance to the S-PSAM format under the different pilot blocks for both the short-packet and long-packet transmissions.