Title: Improving the DMT Performance for MIMO Communication With Linear Receivers
Authors: Tang, Ti-Wen
Chen, Min-Kun
Lu, Hsiao-Feng
Department of Electronics Engineering and Institute of Electronics
Keywords: Diversity-multiplexing tradeoff (DMT);explicit optimal code constructions;linear receivers;precoding matrix;quasi-static multiple-input-multiple-output (MIMO) channel
Issue Date: 1-Mar-2013
Abstract: Multiple-input-multiple-output (MIMO) linear receivers are often of more practical interest than maximum-likelihood (ML) receivers due to their low decoding complexity but at the cost of worse diversity gain performance. Such a statement on performance loss is due to the assumption of using an independent identically distributed complex Gaussian vector as channel input. By removing this assumption, we find that the diversity performance of MIMO linear receivers can be significantly improved. In an extreme case, it can be the same as that of ML receivers. Specifically, in this paper, we investigate the diversity-multiplexing tradeoff (DMT) performance of MIMO linear receivers with colored and possibly degenerate Gaussian channel inputs. By varying the rank of the covariance matrix of the channel input vector and by allowing temporal coding across multiple channel uses, we show that the MIMO linear receiver can achieve a much better DMT performance than the currently known one. Explicit optimal code constructions are provided, along with simulation results, to justify the above findings. For the case of (2 x 2) and (3 x 3) MIMO linear receivers, simulation results show that the newly proposed codes provide significant gains of 10 and 12.08 dB in E-b/N-0 at bit error rate 10(-4) compared to the conventional schemes, respectively.
URI: http://dx.doi.org/10.1109/TVT.2012.2230348
ISSN: 0018-9545
DOI: 10.1109/TVT.2012.2230348
Volume: 62
Issue: 3
Begin Page: 1189
End Page: 1200
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