MMSE Multiuser downlink multiple antenna transmission for CDMA systems
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2004
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Choi, J.
Perreau, S.L.
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IEEE Transactions on Signal Processing, 2004; 52(6):1564-1573
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In this paper, we propose a new downlink transmit antenna processing (TAP) technique for code division multiple access (CDMA) equipped with multiple transmit antennas. In order to find the weight vectors for downlink signals, a minimum mean square error (MMSE) performance criterion is used. Since the multiuser interference is taken into account in the calculation of the weighting vectors for TAP, the proposed method is a multiuser downlink TAP method. It is assumed that the downlink channels are known by the downlink TAP. For given channel conditions, the optimal weight vectors are found with a closed-form expression under both flat and frequency-selective fading channel assumptions.
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Copyright IEEE 2004