| 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 |
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(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 |
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(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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