DMCA
Iterative Multi-User Decoding with Time-Variant Channel Estimation for MC-CDMA (2004)
| Venue: | in Fifth International Conference on 3G Mobile Communication Technologies, London, United Kingdom |
| Citations: | 7 - 4 self |
BibTeX
@INPROCEEDINGS{Zemen04iterativemulti-user,
author = {Thomas Zemen and Christoph F. Mecklenbräuker and Joachim Wehinger and Ralf R. Müller},
title = {Iterative Multi-User Decoding with Time-Variant Channel Estimation for MC-CDMA},
booktitle = {in Fifth International Conference on 3G Mobile Communication Technologies, London, United Kingdom},
year = {2004},
pages = {18--20}
}
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Abstract
We propose an iterative receiver for a multi-carrier (MC) code division multiple access (CDMA) system in the uplink for users moving at vehicular speed. MC-CDMA is based on orthogonal frequency division multiplexing (OFDM), thus time-variant channel estimation can be performed for every subcarrier independently. The variation of a subcarrier over the duration of a data block is upper bounded by a maximum Doppler bandwidth which is determined by the maximum velocity of the users and the carrier frequency. We exploit results from the theory of time-concentrated and bandlimited sequences and apply a Slepian basis expansion for timevariant subcarrier estimation. The Slepian basis functions are determined by two parameters; the block length and the maximum Doppler bandwidth. This approach enables timevariant channel estimation without complete knowledge of the second-order statistics of the fading process. The performance of the iterative receiver is validated for a wide range of velocities by simulations.
Keyphrases
time-variant channel estimation iterative multi-user decoding iterative receiver maximum doppler bandwidth complete knowledge vehicular speed carrier frequency data block second-order statistic code division multiple access bandlimited sequence fading process timevariant channel estimation slepian basis expansion orthogonal frequency division multiplexing maximum velocity slepian basis function wide range block length
