Bit-interleaved coded differential space-time modulation (DSTM) for transmission over ¤at Rayleigh fading channels is discussed. For improved noncoherent detection without channel state information at the receiver, iterative decoding employing hard-decision feedback and prediction-based metric computation are applied. The performance is assessed based on analytical expressions for the bit-error rate and simulations. For the most relevant case of two transmit antennas it is shown that the

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... d scheme offers high power ef£ciency exploiting both space and time diversity, while computational complexity is kept at a low level.