点对多点无线局域网中直扩序列选取

Selection of Direct Spread Spectrum Sequence in Point to Multipoint Wireless Local Area Network

扩频序列的选择和构造是扩频通信系统设计的关键技术之一,系统的抗干扰、抗多径衰落、抗截获、保密、同步实现等均与所采用的扩频序列密切相关,扩频序列良好的相关特性和随机性对系统的性能具有决定性的作用。在点对多点通信系统中采用直接序列扩频方式,结合实际需求,通过对m序列、M序列、gold序列和kasami序列进行充分分析和仿真,得到了5种长度相关性能最优的直扩序列。

The selection and constitution of spread spectrum sequence is one of the key technologies in design of spread spectrum communication system.The ability of anti-jamming, anti-feding, anti-interception, secrecy and synchronization of the communication system is closely correlative with the used spread spectrum sequence. The better correlation and randomicity of spread spectrum sequence play crucial role to improve the performance of system. The direct sequence spread spectrum is used in point to multipeint WLAN. In order to meet the practical need,five kinds of direct sequences which have better performance are found through analyzing and studying m spectrum, M spectrum,gold spectrum, kasami spectrum.