MMSE detection of multi-carrier CDMA
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abstract
Minimum mean-squared error (MMSE) detection of multi-carrier code-division multiple-access (CDMA) signals is investigated in this paper. The performance of two different design strategies for MMSE detection is compared. In one case, the MMSE filters are designed separately for each carrier while in the other case the optimization of the filters is done jointly. Naturally, the joint optimization produces a better receiver, but the difference in performance is shown to be substantial. A mechanism is then developed to track the channel fading parameters for all the users' signals so that joint optimization of the receiver filters is possible in a time-varying channel. Simulation results show that the performance of this receiver is close to ideal theoretical results for moderate vehicle speeds, those for which the normalized Doppler rate is below one percent.
