直扩系统一种在极低信噪比下的解扩解调的方法  

A Despread and Demodulating Method in Very Low SNR in DSSS

作　　者：王妙[1] 左继章[1] 

机构地区：[1]空军工程大学工程学院,西安710038

出　　处：《微计算机信息》2009年第27期27-28,3,共3页Control & Automation

摘　　要：在输入信噪比极低的直序扩频系统中,常规的接收机获得的处理增益难以满足系统低误码率的要求。提出在传统的择大判决法的基础上,用多码元累加方法对中频采样信号直接进行同时解扩解调。仿真分析表明,该方法能够获得比常规方法更高的处理增益,可以在极低的信噪比下实现解扩解调。The process-gains of the general receivers of DS/SS can＇t satisfy a low bit-error-rate if the signal-noise-ratio of input signal is very low. A new algorithm based on the traditional maximum-selection method is proposed. This method despreads and demodulates the IF sampled signal simultaneously by multi-symbol accumulation.The results of simulation show that this method can get a higher process-gains and can despread and demodulate in a very low signal-noise-ratio system.

关 键 词：直接序列扩频 处理增益 择大判决法 多码元累加 解扩解调 

分 类 号：TN91[电子电信—通信与信息系统]