差分混沌键控系统接收信噪比评估  

Received signal-to-noise estimation for differential chaos shift key system

作　　者：余永城 蔡国发 翁秋华[1] Yu Yongcheng;Cai Guofa;Weng Qiuhua(Fujian Meteorological Information Center, Fuzhou 350001, China;Guangdong University of Technology, Guangzhou 510006, China)

机构地区：[1]福建省气象信息中心,福州350001 [2]广东工业大学,广州510006

出　　处：《国外电子测量技术》2018年第1期39-45,共7页Foreign Electronic Measurement Technology

摘　　要：本文研究了在多径瑞利衰落信道下差分混沌键控（DCSK）系统的接收信噪比（SNR）评估问题。通过使用数据信息和导频信息及基于最大似然（ML）准则,推导了数据辅助（DA）和非数据辅助（NDA）场景下DCSK系统的SNR估计器。为了衡量SNR估计器的有效性,推导全数据辅助（FDA）估计器和NDA估计器的克拉美-劳下界（CRLBs）。仿真结果表明,在大的扩频因子下,SNR估计器的性能能够很好地靠近CRLBs。最后,将NDA估计器用于具有信道编码的DCSK系统,设计一种盲迭代信道估计与译码器,结果表明,瑞利多径衰落信道下,盲迭代译码器获得了很好的误码率（BER）性能。In this paper,the problem of the received signal-to-noise ratio（SNR）estimation for differential chaos shift key（DCSK）system over multipath Rayleigh fading channels is studied.By using the data and pilot symbols and maximum likelihood（ML）criteria,the SNR estimators of DCSK system under the data-aided（DA）and non-data aided（NDA）scenarios are derived.To estimate the effectiveness of the SNR estimator,the Cramér-Rao lower bounds（CRLBs）of the fully data-aided（FDA）estimators and the NDA estimators are derived.Simulated results show that for a large spreading factor the performance of SNR estimators can be close to CRLBs.Finally,the NDA estimator is used for channel-coded DCSK system,and blind iterative channel estimation and decoder is designed.The results show that the blind iterative decoder can obtains good bit error rate（BER）performance over multipath Rayleigh fading channels.

关 键 词：差分混沌键控系统 信噪比估计 克拉美-劳下界(CRLBs) 多径瑞利衰落信道 

分 类 号：TN919.3[电子电信—通信与信息系统]