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EURASIP Journal on Wireless Communications and Networking

, 2013:240

First Online: 07 October 2013Received: 14 May 2013Accepted: 24 September 2013


Within the context of linearly precoded MIMO-OFDM combination of multiple antenna techniques with multicarrier transmission schemes such as orthogonal frequency division multiplexing systems with multiple-stream transmission, maximum likelihood detection MLD has been shown to offer large performance gains when compared to an all-linear setup i.e., linear transmitter-receiver when either perfect or imperfect channel state information at the transmitter CSIT is available. Unfortunately, these gains come at the cost of a higher complexity. In particular, the increase in computational cost is more significant when the receiver is designed to operate with soft information and even more dramatic when, in order to optimise error rate performance, iterative decoding is allowed. In order to exploit the best features of each detection technique, this paper proposes a method to selectively choose the detection strategy ML or linear for each individual subcarrier as a function of the instantaneous channel conditions and CSIT accuracy. Numerical results show that a cautious and selective use of ML detection substantially reduces complexity while still reaping most of the performance advantage.

Electronic supplementary materialThe online version of this article doi:10.1186-1687-1499-2013-240 contains supplementary material, which is available to authorized users.

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Autor: Felip Riera-Palou - Guillem Femenias


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