通用PSK和QAM解调接收机  

Universal PSK and QAM demodulation receiver

作　　者：吕岩[1] 李劲[2] 

机构地区：[1]内蒙古工业大学信息工程学院,内蒙古呼和浩特010062 [2]武汉大学电子信息学院,湖北武汉430072

出　　处：《河北大学学报（自然科学版）》2013年第2期204-209,共6页Journal of Hebei University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61271400)

摘　　要：在航天和卫星通信领域的CCSDS,DVB等多个标准中,都采用PSK和QAM调制方式,此外PSK和QAM调制也在其他商用标准中予以采用,因而通用PSK和QAM解调接收机的研究是十分必要的.本文基于通用的正交解调结构,根据模块共用和参数通用的设计原则,提出一种数据率可变的通用PSK和QAM解调接收机.接收机PSK解调的载波恢复采用Costas环,QAM解调的载波恢复采用减星座的Costas环,而PSK和QAM解调的定时恢复采用Gardner算法.解调性能的仿真结果表明:与理论值相比,BPSK、QPSK的解调性能恶化在1dB以内,16QAM的性能恶化在2dB以内,通用接收机可以较好地实现PSK和QAM解调.The paper proposes a variable data-rate receiver on universal PSK （phase shift keying） and QAM （quadrature amplitude modulation） receiver by based on general quadrature architecture, and ac- cording to design principle of module sharing and same parameter. In universal receiver, PSK demodula- tions achieve carrier recovery by Costas loop, and QAM demodulations achieve carrier recovery by constel- lation-reduced Costas loop. PSK and QAM demodulations achieve timing-recovery by Gardner algorithm. The simulation results of demodulation performance show that. the demodulation performance degrades in 1 dB for BPSK and QPSK, and 2 dB for 16QAM, compared with theoretical values. It is obvious that the universal receiver preferably fulfils PSK and QAM demodulations.

关 键 词：软件无线电 CIC滤波 半带滤波 PSK调制 QAM调制 

分 类 号：TN85[电子电信—信息与通信工程]