We propose an efficient iterative algorithm for demodulating/decoding linear dispersion (LD) codes in the case of an unknown MIMO channel. The algorithm is based on the POCS (projections onto convex sets) technique and consists of a~teniating pmjections of an estimate of the transmit matri.r onto hvo linear subspaces. In the noise-free case, the iteration is giraranteed to converge to the transmitted data whenever the LD code theoretically allows perfect data reconstruction. In the presence of

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... oise, simulation results demonstrate the algorithm's good performance. We also propose a DFT-matrix based code design that yields a further substantial reduction of complexiry, and a modified algorithm that exploits the presence of pilot symbols. 0-7803-7576-9/02$17.00 0 2002 IEEE 'Throughout this paper, complex quantities will be marked by a tilde -. 284 in