基于地空数据链路Rake接收技术研究  

Research on Rake Receiving Technique Based on Ground-to-air Datalink

作　　者：唐志华[1] 李现亭[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2008年第3期49-50,64,共3页Radio Engineering

摘　　要：通常Rake合并与解调是根据导频信号来完成的,然而对于无导频的地空通信链路,如何实现Rake的分集接收,是一个值得深入研究的问题。本文提出了一种非相干解决方案,利用串-并混合搜索与串行搜索相结合的技术,优化了基于PN序列码捕获的接收机路径搜索算法;采用分区间加权方法,大大降低了实现接收机多径合并的复杂度,并提高了系统性能。仿真结果表明:它是克服信道衰落的一个重要手段,可以提高通信系统的整体性能,改善地空通信中"弱区"的影响。In general, Rake combination and demodulation are realized according to pilot signals. For the ground-to-air communication datalink without pilot signals, how to realize Rake diversity reception is an issue worth depth research. This paper presents a noncoherent solution.This solution uses the combination technique of serial-parallel mixed search and serial search to optimize the receiver path search algorithm based on PN sequence code acquisition, uses the partition weighted method to greatly reduce the complexity of implementing receiver multipath combination and improve the performance of system .The simulation results show that it is an important means of overcoming channel fading and can increase the overall performance of communication system and decrease the effects of ＂weak area＂ in ground-to-air communications.

关 键 词：地空数据链 RAKE 时延扩展 信道估计 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]