一种新的具有恒虚警概率的PN码自适应盲捕获方法  

A new adaptive PN code blind acquisition scheme with CFAR

作　　者：张颖光[1] 廖桂生[1] 张林让[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2004年第6期855-859,共5页Journal of Xidian University

基　　金：国家自然科学基金资助项目(60102005)

摘　　要：提出了一种具有恒虚警概率的串行搜索伪随机码自适应盲捕获方法.该方法不需要借助于导频信号,利用相关解扩前和相关解扩后的信号功率之比作为判决统计量,根据判决统计量的概率密度函数的特性得到与信号功率和噪声、干扰功率无关的判决门限,从而实现了具有恒虚警概率的自适应捕获.对白色噪声环境下无衰落和瑞利衰落的情况下的检测性能进行了理论分析和仿真,结果表明所得出的方法实现了具有恒虚警概率的自适应盲捕获.A new adaptive serial search pseudonoise (PN) code blind acquisition scheme is proposed, which does not need the help of the pilot signal. The ratio of the power estimation of the pre-correlation signal and post-correlation signal is used as the decision variable. The probability density function (pdf) of the decision statistics is derived. The decision threshold is shown to be independent of the signal power and noise power, so that the constant false alarm rate is achieved. The performance of the proposed scheme is theoretically analyzed and also simulated under the AWGN and Rayleigh fading environment. The results show that the CFAR is achieved in the proposed adaptive blind acquisition scheme.

关 键 词：直接序列扩展频谱 码捕获 检测概率 恒虚警概率 

分 类 号：TN911.23[电子电信—通信与信息系统]