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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。
MBOK is more efficient than direct sequence spread spectrum (DSSS) spectrum, but the MBOK modulation has high time-domain equalization complexity over long-delay dense multipath UWB channels. This paper presents a low complexity frequency domain equalization algorithm for MBOK UWB systems. The algorithm basically eliminates equalized residual multipath interference and transforms the UWB channel into an AWGN approximate channel. Based on the zero point distribution theory of channel transfer function, the parameters of MBOK sequence design related to residual multipath interference are analyzed, and the criterion of channel equalization algorithm in frequency domain is given.