摘要
突发直接序列扩频具有不定时发送的特点,可以数据驱动突发,也可以定时突发,比连续波直接序列扩频有更好的隐蔽性。当扩频比较大时,突发扩频同步实现消耗的硬件资源巨大。针对此问题,重新设计了物理层的帧结构,利用FFT/IFF的伪码并行捕获方法,通过设置合适的时间窗口,对当前积分信号进行多路延迟判决,完成伪码相位同步。此外,利用唯一字序列完成时间和频率的同步,利用开环频率估计补偿数据段频偏。最后通过仿真和硬件设计完成了整个同步方法的实现和性能评估,取得了理想的效果。
Burst direct sequence spread spectrum has the characteristics of untimed transmission,which can be data-driven or timed.It has better concealment than continuous wave direct sequence spread spectrum.When the spread spectrum is relatively large,the synchronization of burst spread spectrum consumes huge hardware resources.To solve this problem,the frame structure of the physical layer is redesigned,and the FFT/IFF pseudo-code parallel acquisition method is used.By setting the appropriate time window,the current integral signal is given multiple delay decision,and the pseudo-code phase synchronization is completed.In addition,a unique word sequence is used to synchronize time and frequency,and an open-loop frequency estimation is used to compensate the frequency offset of the data segment.Finally,the implementation and performance evaluation of the synchronization method are completed through simulation and hardware design,and the ideal results are obtained.
作者
李崇
温亚萍
宫春涛
LI Chong;WEN Yaping;GONG Chuntao(The 54th Research Institute of CETC,Shijiazhuang 050081,China)
出处
《通信电源技术》
2021年第8期42-46,共5页
Telecom Power Technology
关键词
突发扩频
大扩频比
并行处理
burst spread spectrum
large spread spectrum ratio
parallel process
