| 直序扩频系统中频信号的同时解扩解调方法 |
| |
| 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. |
| |
| 作者姓名： | 宫二玲 王跃科 杨俊 |
| |
| 作者单位： | 国防科技大学机电工程与自动化学院,湖南,长沙,410073 |
| |
| 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 |
| 文章编号： | 1001-2486(2004)06-0065-04 |
| 收稿时间： | 2004/5/21 0:00:00 |
| 修稿时间： | 2004年5月21日 |
Simultaneous Despread and Demodulating Method of IF Signal in DSSS System |
| |
| GONG Erling,WANG Yueke and 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. |
| |
| Authors: | GONG Erling WANG Yueke and YANG Jun |
| |
| Institution: | College of Mechatronics Engineering and Automation, National Univ. of Defense Technology, Changsha 410073, China;College of Mechatronics Engineering and Automation, National Univ. of Defense Technology, Changsha 410073, China;College of Mechatronics Engineering and Automation, National Univ. of Defense Technology, Changsha 410073, China |
| |
| 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 |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《国防科技大学学报》浏览原始摘要信息 |
| 点击此处可从《国防科技大学学报》下载免费的PDF全文 |
|
