基于遗传算法的UWB信号非相干捕获方法  

A Non-Coherent Method of UWB Signal Acquisition Based on Genetic Algorithm

作　　者：杨志华[1] 张钦宇[1] 张乃通[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院通信工程研究中心,广东深圳518055

出　　处：《电子学报》2010年第7期1568-1573,共6页Acta Electronica Sinica

基　　金：国家自然科学基金青年基金(No.60702034)

摘　　要：本文针对动态信噪比环境超宽带(UWB,Ultra WideBand)信号的非相干捕获,提出了一种基于遗传算法的信号捕获方案.以遗传算法结合在线估计接收信噪比,搜索积分窗口长度与定时位置的参数组合,实现系统要求的比特错误概率.该方法解决了传统捕获方案在未知信噪比条件下积分长度无法择优选取以及捕获门限难于设定的问题.仿真结果表明,基于遗传算法的二维参数捕获方法与传统Look and Jump by Ksteps算法相比有效的提高了未知信噪比条件下的系统捕获性能,拓展了UWB非相干系统的应用范围.Focusing on ultra wideband（UWB） signal acquisition conditional on the uncertain signals to noise ratio（SNR）,a non-coherent scheme is proposed in this article based on genetic algorithm,which combines online SNR estimation with genetic algorithm to search the parameters pair of integral length and timing alignment.Contrast with general schemes,the scheme proposed is suitable for the uncertain SNR conditions where integral length is unavailable and dynamic detection threshold is hard to be set.The results show that,compared with Look and Jump by K steps algorithm,the proposed scheme improved significantly the acquisition performances on uncertain SNRs.

关 键 词：超宽带 非相干 信号捕获 遗传算法 参数组合 

分 类 号：TN911[电子电信—通信与信息系统]