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Precoding for Downlink Block-Transmission in DS-CDMA Systems with Multipath Channels

We investigate precoding of the information symbols before spreading for downlink DS-CDMA systems subject to multipath fading. With precoding, a conventional receiver (RAKE) can achieve performance comparable to other suboptimal multiuser receivers, e.g. MMSE and ZF. We extend the work in [1] regarding constrained precoding for multipath channels and present closed form solutions. Through simulations we show performance of the RAKE receiver with precoding comparable to that of the traditional zero-forcing and MMSE receivers without precoding.