Abstract
In this paper, we consider the application of space- time (ST) block coding in the uplink of DS-CDMA systems. A novel system architecture, which is the combination of single- carrier time-reversal zero-padded (SC-TR-ZP) based ST block coding with chip-interleaved block-spread (CIBS)-CDMA, is proposed for frequency-selective uplink transmissions. Moreover, several decision feedback sequence estimation (DFSE) schemes are proposed for ST coded CIBS-CDMA systems. The simulation results demonstrate a significant improvement in the performance of the proposed system compared to CIBS-CDMA without ST coding. The simulation results also indicate that a substantial per- formance improvement can be achieved either using multistage modified unwhitened DFSE (MMUDFSE) or whitened DFSE (WDFSE) scheme over the linear MMSE equalizer. Furthermore, a low-complexity linear prediction (LP) based approach can be adapted to compute the whitening prefilter required in WDFSE to transform the system model into its minimum phase equivalent.
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