自适应判决门限PN码混合捕获方案  

A Rapid Hybrid Acquisition of PN Sequences with Adaptive Decision Threshold Control in Multipath Fading Mobile Channels

作　　者：宋阳[1] 胡光锐[1] 刘烨[1] 

机构地区：[1]上海交通大学电子工程系,上海200030

出　　处：《上海交通大学学报》2004年第z1期80-82,共3页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(60172018);国防重点实验室基金项目(51473030101JW0301)

摘　　要：提出了一种适用于多径衰落信道下实现快速PN码捕获的自适应判决门限混合捕获方案.系统采用多个非相干相关器进行并行搜索和估计背景功率电平,利用恒虚警方法自适应设置系统的判决门限.通过在整个PN码不定相位上均匀分布各相关器的本地PN码相位,能够避免在多径干扰环境下多个同步相位同时出现在相关器中,消除多径干扰对系统检测性能的影响.文中对检测性能进行了分析和比较,并给出了在均匀背景噪声和多径干扰环境下的仿真结果.结果表明,提出的方法可以有效消除多径干扰的影响.A rapid hybrid acquisition of PN sequences with adaptive decision threshold control was proposed. The system utilizes the hybrid acquisition method to search the whole uncertainty phases. The constant false alarm rate (CFAR) method is introduced to estimate the background power level and to set the detection threshold. The detection performances were analyzed and compared. The results show that the proposed method can effectively eliminate the effects of the multipath interference.

关 键 词：扩频通信 混合捕获 PN序列 恒虚警率 多径干扰 

分 类 号：TN914.4[电子电信—通信与信息系统]