MMSE detection of multicarrier CDMA
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Minimum mean-squared error (MMSE) detection of multicarrier code-division multiple-access (CDMA) signals is investigated in this paper. The theoretical performances of two different design strategies for MMSE detection are 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. The multi-carrier CDMA performance is then compared to that of a single-carrier CDMA system on a frequency-selective fading channel. 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. Performance begins to degrade when the normalized Doppler rate is higher than about 1%.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
author list (cited authors)
Miller, S. L., & Rainbolt, B. J.
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