The space-time bit-interleaved coded modulation (ST-BICM) is an efficient technique to obtain high diversity and coding gain on a block-fading MIMO channel. Its maximumlikelihood (ML) performance is computed under ideal interleaving conditions, which enables a global optimization taking into account channel coding. Thanks to a diversity upperbound derived from the Singleton bound, an appropriate choice of the time dimension of the spacetime coding is possible, which maximizes diversity while minimizing complexity. Based on the analysis, an optimized interleaver and a set of linear precoders, called dispersive nucleo algebraic (DNA) precoders are proposed. The proposed precoders have good performance with respect to the state of the art and exist for any number of transmit antennas and any time dimension. With turbo codes, they exhibit a frame error rate which does not increase with frame length.
We consider the transmission of a common message from a transmitter to two receivers over a broadcast channel, also called a multicast channel in this case. The two receivers are allowed to cooperate with each other in full-duplex over non-orthogonal cooperation links. We investigate the informationtheoretic upper and lower bounds on the broadcast rate. In particular, we propose a two-round cooperation scheme in which the receivers interactively perform compress-forward (CF) and then decode-forward (DF) to improve the achievable rate. Numerical results compare the proposed scheme to existing schemes and the cutset upper bound in the Gaussian case. We show that the proposed scheme outperforms the non-interactive DF and CF schemes as well as the noisy network coding scheme. The gain over the DF scheme becomes larger when the main channel becomes symmetric, while the gain over the CF scheme becomes larger when the main channel becomes asymmetric.
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