Low complexity adaptation for SISO channel shortening equalizers

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• 作者：Mohan Avinash ; ^{avi1986@ece.iisc.ernet.in} ; Hari K.V.S.¹ ; ^{hari@ece.iisc.ernet.in}
• 关键词：Channel shortening ; Low complexity ; Multicarrier systems ; OFDM ; Time domain equalization ; MSSNR
• 刊名：AEU - International Journal of Electronics and Communications
• 出版年：2012
• 期刊代码：1_14348411
• 类别：cp
• 出版时间：August, 2012
• 卷：66
• 期：8
• 页码：600-604
• 文件大小：355 K

摘要

Since the days of Digital Subscriber Links (DSL), time domain equalizers (TEQ's) have been used to combat time dispersive channels in Multicarrier Systems. In this paper, we propose computationally inexpensive techniques to recompute TEQ weights in the presence of changes in the channel, especially over fast fading channels. The techniques use no extra information except the perturbation to the channel itself, and provide excellent approximations to the new TEQ weights. Adaptation methods for two existing Channel shortening algorithms are proposed and their performance over randomly varying, randomly perturbed channels is studied. The proposed adaptation techniques are shown to perform admirably well for small changes in channels for OFDM systems.