功放非线性对直扩卫星通信伪码捕获的影响  

Impact of power amplifier's nonlinearity on PN code acquisition in DS-CDMA satellite communication

作　　者：胡泽鑫[1] 刘会杰[2] 梁旭文[1,2] 

机构地区：[1]中科院上海微系统与信息技术研究所,上海200050 [2]上海微小卫星工程中心,上海201210

出　　处：《信息技术》2014年第7期1-6,10,共7页Information Technology

基　　金：国家863计划项目(2011AA12A101);中科院创新基金项目(CXJJ-11-S107)

摘　　要：推导了在非线性放大条件下,DS-CDMA卫星通信系统下行链路PN码捕获判决变量的解析表达式,针对功放非线性失真对捕获性能的影响做了量化分析。理论分析结果表明,非线性失真会导致检测概率降低,平均捕获时间增加。研究结果对功率放大器的选型、功率余量的保留、链路预算设计等具有重要参考价值。The analytical expression of decisionwith nonlinear PA is deduced. The impact of PAvariable in down-link PN code acquisition processingnonlinearity distortion on performance of acquisition isquantitatively analyzed. The theoretical analysis results show that PA nonlinearity distortion leads to theincrease of mean acquisition time and the decrease of detection probability while false alarm probability isconstrained. The results provide important suggestion for the selection of PA type, the reservation of PApower and link budget, etc.

关 键 词：卫星通信 功率放大器 非线性 PN码捕获 

分 类 号：TN927.2[电子电信—通信与信息系统]