【摘要】 针对不断发展的传统跳码直扩通信系统的盲检测技术,直扩通信的安全问题不容忽视。改善跳码直扩通信系统的性能得到了广泛重视,但也存在不少问题,最突出的便是跳码直扩同步捕获时间的增加,传输效率的下降。如何对跳码直扩通信中跳码信号进行捕获成为研究的热点,因此详细分析对预编码跳码系统下已有的跳码直扩捕获方法,并基于研究结果提出了一种新的基于多匹配滤波法的跳码直扩同步捕获方法,经过理论分析得出该方法能够有效提高捕获效率,通过仿真进行验证,发现多匹配滤波法可以缩短捕获时间,提高相同信噪条件下的捕获概率,即提高了捕获效率。更多还原

【Abstract】 With the continuous development of wireless blind detection technology for traditional DSSS(Direct Sequence Spread Spectrum) communication system,the security performance of DSSS becomes even important,and CH-DSSS(Code-Hopping Direct Sequence Spread Spectrum),a system with higher security,receives wide attentaion.However there also exist so many problems of which the most prominent is the increased of spread spectrum acquisition time and the decline of efficiency.How to capture the code-hopping signal in the CH-DSSS thus becomes a hot research topic.A detailed analysis is done on existing precoding code-hopping acquisition method in CH-DSSS.And based on the research results,a new CH-DS acquisition method,multi-matched filter method is proposed.Theoretical analysis and simulation indicate that this method can effectively improve the capture efficiency,multi-matched filter method can shorten the time of acquisition,promote the probability of capturing under the same SNR,that is,improve the capture efficiency.更多还原