RLS channel estimation with adaptive forgetting factor for DS-CDMA frequency-domain equalization

Yohei Kojima, Hiromichi Tomeba, Kazuaki Takeda, Fumiyuki Adachi

研究成果: ジャーナルへの寄稿学術論文査読

3 被引用数 (Scopus)

抄録

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using MSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good BER performance is achieved. In this paper, we propose a channel estimation scheme using one-tap recursive least square (RLS) algorithm, where the forgetting factor is adapted to the changing channel condition by the least mean square (LMS) algorithm, for DS-CDMA with FDE. We evaluate the BER performance using RLS-CE with adaptive forgetting factor in a frequency-selective fast Rayleigh fading channel by computer simulation.

本文言語英語
ページ(範囲)1457-1465
ページ数9
ジャーナルIEICE Transactions on Communications
E92-B
5
DOI
出版ステータス出版済み - 2009 5月

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