Abstract
AbstractThis 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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