卫星通信中不同调制信号的预失真研究  

Digital Pre-Distortion of Different Modulation Methods in Satellite Communication Systems

作　　者：韩冰[1] 晋东立[1] 

机构地区：[1]北京跟踪与通信技术研究所,北京100094

出　　处：《通信技术》2015年第6期667-671,共5页Communications Technology

摘　　要：卫星通信技术近年来发展较快,承载的通信业务也较多,导致频谱资源紧张,功率资源受限,迫切需要采用高阶调制、多载波传输等方式来缓解通信资源的紧张,QPSK、8PSK、16QAM等更高阶调制方式在卫星通信中将会获得越来越广泛的应用。这类信号直接通过功放后,信号产生失真,影响接收端信号的正确解调,预失真技术是近年来补偿功放非线性的最有效手段之一。在研究这几种高阶调制信号特点的基础上,对几种调制方式的信号分别进行预失真处理,并分析各信号的抗噪声性能,总结出16QAM信号在卫星通信中的应用会缓解目前通信资源紧缺问题。Satellite communication technology develops rapidly in recent years, and satellite communication carries more communication services than ever before. Under this circumstance, frequency resource and power resource become increasingly short. As a result, different high-order modulation methods, such as QPSK, 8PSK andl6QAM, are applied in satellite communication. However, power amplifier would be conducive to quick distortion of these modulated signals, and thus the compensation technology has to be a- dopted to deal with this distortion. Base on study of the characteristics of these high-order modulated sig- nals, pre-distortion processings are done respectively on several modulated signals, and analyses also im- plemented on BER performance of QPSK,8PSK and 16QAM in the satellite nonlinear channel. Conclusion is drawn that the application of 16QAM modulation in satellite communication would alleviate the problem of communication-resource shortage.

关 键 词：卫星通信 高阶调制 预失真 RLS 

分 类 号：TN927.2[电子电信—通信与信息系统]