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Iterative multi-user decoding with time-variant channel estimation for MC-CDMA

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4 Author(s)
T. Zemen ; Forschungszentrum Telekommunikation Wien, Vienna, Austria ; C. F. Mecklenbrauker ; J. Wehinger ; R. R. Muller

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 time-variant subcarrier estimation. The Slepian basis functions are determined by two parameters, the block length and the maximum Doppler bandwidth. This approach enables time-variant 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.

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3G Mobile Communication Technologies, 2004. 3G 2004. Fifth IEE International Conference on

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