基于FB-CFAR的多径信道阶检测算法  

Detecting the Order of Multipath Channel Based on FB-CFAR Algorithm

作　　者：李钰[1] 顾宇杰[1] 陈抗生[1] 

机构地区：[1]浙江大学信息与电子工程系,浙江杭州310027

出　　处：《电子学报》2007年第1期175-179,共5页Acta Electronica Sinica

摘　　要：多径信道阶的检测是无线通信参数化信道估计的首要步骤,对系统性能有着重要的影响.然而,目前使用的检测方法大多是基于Akaike信息理论准则(AIC)或最小描述长度准则(MDL)提出的.这些准则在高信噪比条件下性能较好,但在低信噪比时检测性能不好.本文提出了一种基于前后平滑恒虚警率准则(FB-CFAR)的算法来提高信道阶的检测性能.OFDM系统中的仿真结果表明该算法能有效提高低信噪比时多径信道阶的正确检测概率.Detecting the order of multipath channel is the first step of a parametric channel estimator in wireless communication. It is critical to improve the performance of system. However, the methods to estimate the order of multipath are mainly based on Akaike information theoretic criterion （AIC） or minimum description length （MDL）. They perform good at high SNR but bad at low SNR. In this paper, an improved constant false alarm rate algorithm based on forward-backward averaging （FB-CFAR） is proposed to detect the order of multipath channel. Simulation results in an OFDM system demonstrate that this algorithm can improve the probability of correct detection at low SNR effectively.

关 键 词：参数化信道模型 无线通信 FB-CFAR 多径信道阶 

分 类 号：TN929.5[电子电信—通信与信息系统]