MBOK超宽带系统的信道频域均衡算法  

Channel frequency domain equalization algorithm for MBOK UWB systems

作　　者：朱亮[1] 肖振宇[1] 葛宁[1] 陆建华[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第1期140-144,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(2007CB310601);国家"八六三"高技术项目(2007AA01Z2b3)

摘　　要：多进制双正交调制(MBOK)比直接序列扩频(DSSS)的频谱效率高,但在长时延密集多径的超宽带信道下,MBOK调制的时域均衡复杂度很高。该文提出一种用于MBOK超宽带系统中的低复杂度的频域均衡算法。该算法基本消除了均衡的残留多径干扰,将超宽带信道变为AWGN近似信道。采用信道传输函数的零点分布理论,分析了与残留多径干扰相关的MBOK序列设计的参数,并给出了应用该频域信道均衡算法的准则。M-ary bi-orthogonal keying （MBOK） can enhance the spectral efficiency of direct sequence spreading spectra （DSSS）. However, the time domain equalization for the MBOK modulation is quite complex in ultra wideband （UWB） channels with severe multipath interference. This paper presents a frequency domain equalization algorithm for MBOK UWB systems. The algorithm is relatively simple and basically eliminates the residual multipath interference due to equalization, converting the UWB channel to a quasi AWGN channel. The theory of zero distribution of the channel transfer function is used to analyze the parameters of MBOK sequences regarding the residual multipath interference, guiding implementation of the frequency domain channel equalization algorithm.

关 键 词：超宽带(UWB) 信遭均衡 多进制双正交调制(MBOK) 传输函数 

分 类 号：TN914.2[电子电信—通信与信息系统]