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Distributed Space-Time Code with Mutual Information Based Soft Information Relaying
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DOI：10.1109/LCOMM.2013.101813.131703.png)
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Abstract
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In this letter, we investigate a distributed space-time coded soft information relaying. In particular, we focus on mutual information based soft forwarding (MIF) scheme with Alamouti space-time block code. In order to achieve a full diversity order, we propose a weighted amplifying factor based on average soft noise variance instead of instantaneous one. The exact analytical expression for average soft noise variance is first derived. A tight upper bound of the average soft noise variance is also derived in closed-form. It is shown that the proposed distributed MIF Alamouti scheme can achieve a full diversity order, and outperforms various distributed Alamouti schemes reported in the literature.
Keywords:
Diversity order
Alamouti space-time block code
mutual information based soft forwarding
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