FM-DCSK在非平坦衰落信道下的系统设计与仿真  

System devising and simulation of FM-DCSK in non-flat fading channel

作　　者：李水平[1] 王琳[1] 夏玉雷[1] 

机构地区：[1]重庆邮电学院编码技术研究所,重庆400065

出　　处：《重庆邮电学院学报（自然科学版）》2005年第3期282-286,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition)

基　　金：国家自然科学基金资助项目(62272005);国家"863"资助项目(2001AA123061)

摘　　要：调频-差分混沌键移(FM DCSK)是一种以混沌信号作为载波的非相干的调制解调技术,其输出信号具有固有的宽频特性。由于其在对抗多径衰落方面具有显著的效果,它适合于在无线移动通信信道下使用,因而得到广泛的研究。给出了FM DCSK在非平坦衰落信道下的原理结构图,并做了性能分析,通过仿真发现:在两径瑞利(非平坦慢衰落)信道下,FM DCSK的误码性能优于传统的调制解调技术QDPSK和QPSK。为了进一步提高FM DCSK的误码性能,建议结合使用一些有效的技术,如分集、Rake接收机等。这些结论和建议对于促进FM DCSK在无线通信环境下的研究与应用具有重要的意义。FM-DCSK is a non-coherent modulation and demodulation technique, the output of which has the inherent wide-frequency performance. For its robust performance in combating multi-path fading, it is adaptable to use in the wireless mobile communication channel and is widely focused on. In this paper, the authors present base-band system structure of FM-DCSK in non-flat and slow-fading channel and give performance analysis.Through the simulation it is found that the BER performance of FM-DCSK is superior to the conventional modulation techniques for instance QPSK, QDPSK. In order to improve the BER performance, some valid techniques such as diversity and RAKE receiver should be combined. These conclusions and suggestions are significant to the research and application of FM-DCSK in the wireless communication environment.

关 键 词：调频-差分混沌键移 调制解调 两径瑞利 非平坦慢衰落 多径衰落 RAKE接收机 

分 类 号：TN914[电子电信—通信与信息系统]