Channel estimation and tracking for MC-CDMA signals

This paper investigates the impact of channel estimation errors in the uplink and downlink of a multicarrier code-division multiple-access (MC-CDMA) system. Pilot blocks are periodically inserted into the downlink data stream to perform a least-squares channel estimation. It is shown that a single-user minimum-mean-square-error (MMSE) detector endowed with the proposed channel estimator is robust to estimation errors even under full-loaded conditions. In the uplink scenario channel estimates are computed through a least-mean-square algorithm and are passed to a linear multi-user MMSE detector or a parallel interference cancellation (PIC) receiver. Simulations indicate that in this case the system performance depends heavily on the quality of the channel estimates, meaning that they are particularly critical. Copyright © 2004 AEI

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