低信噪比下短波数传系统Rake接收机设计  

A Rake Receiver Design for HF Data Transmission System under Low SNR

作　　者：周洪霞[1] 唐金元[1] 李洪烈[1] 

机构地区：[1]海军航空工程学院青岛分院,山东青岛266041

出　　处：《通信技术》2011年第5期37-39,76,共4页Communications Technology

摘　　要：在信噪比较低的条件下,短波数据传输系统必须具备抵抗多径衰落的能力。Rake接收技术是抗多径衰落的有效手段之一。这里在直扩-八进制移相键控(DS-8PSK)短波数传系统的基础上,设计了一种改进型Rake接收机,通过在接收端对信号进行相关搜索、多径分离和多径合并,实现了有用信号的分集接收。仿真结果表明,设计的Rake接收机能有效解决短波信道中多径衰落的难题,保证低信噪比条件下短波数据传输的可靠性。Under low SNR,HF data transmission system must be capable resist the multipath interference.Rake receiver technology is such an effective measure.This paper describes a modified Rake receiver design for a DS-8PSK HF data transmission system under low SNR,thus through correlation search,multipath separation and combination of the received signals,the diversity receiving of useful signals is thus realized.Simulation results indicate that the receiver could effectively resist the multipath fading and ensure the reliable data transmission under low SNR.

关 键 词：低信噪比 直扩-八进制移相键控 数据传输 RAKE接收机 

分 类 号：TN919.3[电子电信—通信与信息系统]