摘要
直接序列扩频系统中,扩频序列的选择是个关键问题。扩频序列性能的好坏,直接关系到直接扩频通信系统整体性能的优劣,如抗干扰、抗衰落、同步与跟踪等性能。由于复合序列具有更高的复杂性和抗干扰能力,现已逐步代替传统的扩频序列。为此,提出一种混沌序列与Walsh序列相复合的复合序列,并对复合序列的抗干扰性能、子序列对复合序列性能的影响进行分析,仿真结果表明新的复合序列较传统序列有更强的抗干扰能力,且该复合序列的抗干扰性能不受子序列初始值影响,具有很高的应用价值。
The choice of spread spectrum sequence is a key issue in the direct sequence spread spectrum （DSSS） system. The performance of spread spectrum sequence is directly related to the overall performance of a DSSS system, such as anti-jamming, anti-fading, synchronization and tracking performance. Because of better complexity and anti-jamming capability, the composite spread spectrum sequences have been gradually replacing the traditional spread spectrum sequences. A new composite spread spectrum sequence was proposed based on the chaotic sequence and Walsh sequence. The anti-jamming capability of the proposed sequence and the effect of sub-sequence were analyzed. The simulation results showed that the new composite spread spectrum sequence has better anti-jamming ability than traditional spread spectrum sequences and its anti-jamming ability was hardly affected by the initial value of sub sequences. It has highly value in application.
出处
《大连大学学报》
2013年第6期13-17,共5页
Journal of Dalian University
基金
国家高技术研究发展计划(863计划)资助课题(2012AA80XX03G)
关键词
直接序列扩频
复合序列
混沌序列
误码率
DSSS
composite sequence
chaotic sequence
bit error rate （BER）
