DMCA
Tracking of Fast-Fading Channels in Long-Code CDMA
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BibTeX
@MISC{Sung_trackingof,
author = {Youngchul Sung and Student Member and Lang Tong and Senior Member},
title = {Tracking of Fast-Fading Channels in Long-Code CDMA},
year = {}
}
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Abstract
Abstract—A new technique for blind tracking of fast-fading channels in long-code code division multiple access (CDMA) is proposed by exploiting multipath diversity. Based on a linear interpolation channel model, the proposed method blindly identifies a time-varying channel at arbitrary estimating points within a block up to a scale factor and increases bandwidth efficiency allowing only one pilot symbol within a block, which is much larger than channel coherence time. The proposed method can be implemented using an efficient state-space inversion technique for multiuser cases. The mean square error (MSE) performance of the proposed estimator is compared with the Cramér–Rao bound (CRB) for interpolated channel. Modeling error and bit error rate (BER) are also evaluated using Monte-Carlo simulations and compared with the block fading model and a decision-directed tracking technique. Index Terms—Channel estimation and tracking, fast-fading, interpolation, long-code CDMA, pilot symbols. I.
Keyphrases
fast-fading channel long-code cdma pilot symbol new technique blind tracking efficient state-space inversion technique cram rao bound index term channel estimation multipath diversity bit error rate interpolated channel mean square error channel coherence time decision-directed tracking technique bandwidth efficiency long-code code division multiple access scale factor monte-carlo simulation time-varying channel multiuser case linear interpolation channel model
