引用本文: | 宫二玲,王跃科,杨俊.直序扩频系统中频信号的同时解扩解调方法[J].国防科技大学学报,2004,26(6):65-68.[点击复制] |
GONG Erling,WANG Yueke,YANG Jun.Simultaneous Despread and Demodulating Method of IF Signal in DSSS System[J].Journal of National University of Defense Technology,2004,26(6):65-68[点击复制] |
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直序扩频系统中频信号的同时解扩解调方法 |
宫二玲, 王跃科, 杨俊 |
(国防科技大学 机电工程与自动化学院,湖南 长沙 410073)
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摘要: |
常规直序扩频接收机将中频信号的解扩、解调分立进行,获得的处理增益为扩频码的周期。对于输入信噪比极低的系统,该处理增益难以满足系统低误码率的要求。在基于软件无线电的直序扩频系统中,接收机可以对中频采样信号同时进行解扩解调,分析表明,当采样率满足一定条件时,能够获得比常规方法更高的处理增益,适宜在低信噪比系统中应用。 |
关键词: 直接序列扩频 解扩解调 处理增益 低信噪比 |
DOI: |
投稿日期:2004-05-21 |
基金项目: |
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Simultaneous Despread and Demodulating Method of IF Signal in DSSS System |
GONG Erling, WANG Yueke, YANG Jun |
(College of Mechatronics Engineering and Automation, National Univ. of Defense Technology, Changsha 410073, China)
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Abstract: |
The normal receivers of DSSS system despread and demodulate the IF signal separately, their process-gains are the period of the pseudo-noise sequence. But these process-gains usually cannot satisfy a low bit-error-rate if the signal-noise-ratio of input signal is very low. In a DSSS system based on the software radio, the receiver can despread and demodulate the IF signal simultaneously. It can be proved that this method can get a higher process-gain when the sample rate meets a certain condition, so it can be used in a low signal-noise ratio system. |
Keywords: DSSS despread and demodulating process-gain low signal-noise-ratio |
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