一种用于OFDM系统的信道冲激响应检测算法  

Channel Impulse Response Detection Algorithm for OFDM System

作　　者：刘光辉[1] 文武[1] 李宏亮[1] 朱维乐[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054

出　　处：《电子科技大学学报》2013年第2期209-213,共5页Journal of University of Electronic Science and Technology of China

基　　金：四川省青年科技基金(2010JQ0003);中央高校基本科研业务费(ZYGX2010X006);国家自然科学基金(61101091)

摘　　要：提出了一种基于双滑动窗的检测算法,对信道冲激响应(CIR)进行检测。在采用相干解调的正交频分复用(OFDM)系统中,信道估计的精度对接收机性能有着重要影响。传统的OFDM时域CIR估计算法通常采用简单的门限检测,在检测小功率成分时,由于受噪声影响,容易发生误检或漏检,导致估计精度降低。该文在研究小功率CIR成分产生原因与分布特征的基础上,提出了一种改进的检测算法,并对检测性能进行了理论分析和仿真。仿真结果表明,该算法能够有效提高信道估计精度,改善系统误码性能。A detection algorithm based on dual-sliding-window is proposed for the detection of channel impulse response （CIR）. In OFDM systems with coherent demodulation, the precision of channel estimation has a significant impact on the performance of receivers. However, traditional threshold detection algorithms adopted by time domain channel estimation of OFDM systems is sensitive to noise. In the presence of low-level CIR components, false detection and miss detection occur frequently if the traditional method is adopted, resulting in an inevitable precision loss. According to the cause and the characteristic of low-level CIR, an improved robust CIR detection algorithm is derived in this paper. The detection performance is investigated and simulated. Experimental results verified the theoretical analysis and the validity of the proposed scheme.

关 键 词：信道估计 数字电视地面广播国家标准 正交频分复用 信号检测 

分 类 号：TN914[电子电信—通信与信息系统]