基于零点消除的无线OFDM系统信道缩短均衡器  

Based on Zero-Elimination Channel Shortening Equalizer for Wireless OFDM Systems

作　　者：张萍[1] 秦家银[1] 

机构地区：[1]中山大学信息科学与技术学院电子与通信工程系,广东广州510275

出　　处：《电子学报》2010年第10期2209-2213,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60672048);国家自然科学基金;广东省科技计划(No.2005B10101001);广东省联合基金(No.U0635003)

摘　　要：针对无线信道的有限冲激响应及其全零点特性,本文设计了一种基于零点消除的无线正交频分复用(OFDM)系统信道缩短均衡器,该均衡器利用零点消除的方式有效地缩短信道时延扩展长度,并采用反馈滤波器的形式来实现无限冲激响应滤波器,该方案不仅降低了信道缩短均衡器算法的复杂度,而且也大大简化了无线OFDM系统的设计与实现.仿真结果验证了上述方案和算法的有效性.Cyclic Prefix（CP） is inserted between Orthogonal Frequency Division Multiplexing（OFDM） transmitted blocks to combat multipath,provided that the channel delay spread is shorter than the length of CP.If this condition is not met,an additional Channel Shortening Equalizer（CSE） is required to shorten the channel to the desired length.A novel CSE for a wireless OFDM system is proposed.The CSE takes advantage of the characteristic of a wireless channel,which represents as an all zero system,and eliminates the zeros to effectively reduce the length of channel impulse response.Using feedback filters with low complexity to implement the CSE,the proposed equalizer simplifies OFDM wireless receiver.The Simulation results show the validity of the proposed equalizer.

关 键 词：无线通信 正交频分复用(OFDM) 多径 时域均衡器 信道缩短 

分 类 号：TN911.5[电子电信—通信与信息系统]