单通道同频混合信号的最佳接收及盲解调性能界  

Optimal receiver and blind demodulation performance bounds for single channel co-frequency mixed signals

作　　者：于宏毅[1] 查仁鹏 沈智翔[1] 沈彩耀[1] 胡赟鹏[1] YU Hongyi;ZHA Renpeng;SHEN Zhixiang;SHEN Caiyao;HU Yunpeng(School of Information Systems Engineering,Information Engineering University,Zhengzhou 450000,China)

机构地区：[1]信息工程大学信息系统工程学院,河南郑州450000

出　　处：《通信学报》2024年第12期142-152,共11页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61501517)。

摘　　要：针对混合信号码元序列的最佳检测问题,在同频混合接收基带信号模型的基础上,推导得到联合最大似然盲检测的充分统计量,并给出“混叠波形匹配滤波+符号速率双抽样”的最佳接收机设计。基于充分统计量模型,利用Forney方法推导出了同频混合信号单通道盲解调的性能下界。由于最佳接收机的复杂度随等效符号速率抽样信道长度呈指数增长,针对实际应用中的信道截短问题,进一步分析了截短误差对盲解调性能的影响。结果表明,最佳接收机仿真结果与理论性能分析结果吻合,验证了所推导性能界的合理性。Aiming at the problem of optimal detection of mixed signal symbol sequences,on the basis of co-frequency mixed receiving baseband signal model,sufficient statistics for joint maximum likelihood blind detection were derived,and the optimal receiver design of“mixed waveform matched filtering and symbol rate dual sampling”was given.Based on the sufficient statistics model,a lower bound on the performance of single-channel blind demodulation for cofrequency mixed signals was derived using Forney’s method.Since the complexity of the optimal receiver grows exponentially with the equivalent symbol rate sampling channel length,the impact of the truncation error on the blind demodulation performance was further analyzed for the channel truncation problem in practical applications.The result shows that the simulation results of the optimal receiver coincide with the theoretical performance analysis results,verifying the reasonableness of the derived performance bounds.

关 键 词：单通道盲分离 最佳接收机 充分统计量 盲分离性能界 成对载波多址 

分 类 号：TN911.7[电子电信—通信与信息系统]