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Pilot-Assisted Channel Estimation Using Adaptive Interpolation for Coherent Rake Reception of DS-CDMA Signals
Shinsuke TAKAOKA Fumiyuki ADACHI
IEICE TRANSACTIONS on Communications
Publication Date: 2005/07/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
DS-CDMA, adaptive interpolation, conjugate centrosymmetry property, fast convergence,
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In this paper, a pilot-assisted channel estimation using adaptive interpolation (in which, different interpolation filter tap weights is used for different symbol position) is proposed. Each set of tap weights is updated using the normalized least mean square (NLMS) algorithm, the reference signal for which is obtained by decision feedback and reverse modulation of the received data symbol. In order to reduce the number of tap weight sets and to achieve fast convergence, the conjugate centrosymmetry property of the tap weight set is used. The average bit error rate (BER) performance in a frequency-selective Rayleigh fading channel is evaluated by computer simulation. Also evaluated is the robustness against the frequency offset between a transmitter and a receiver.