Fixed-Complexity Soft MIMO Detection via Partial Marginalization
2008 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, Vol. 56, no 8(1), 3397-3407 p.Article in journal (Refereed) Published
This paper presents a new approach to soft demodulationfor MIMO channels. The proposed method is an approximationto the exact a posteriori probability-per-bit computer. Themain idea is to marginalize the posterior density for the receiveddata exactly over the subset of the transmitted bits that are receivedwith the lower signal-to-noise-ratio (SNR), and marginalize thisdensity approximately over the remaining bits. Unlike the exact demodulator,whose complexity is huge due to the need for enumeratingall possible combinations of transmitted constellation points,the proposed method has very low complexity. The algorithm hasa fully parallel structure, suitable for implementation in parallelhardware. Additionally, its complexity is fixed, which makes it suitablefor pipelined implementation. We also show how the methodcan be extended to the situation when the receiver has only partialchannel state information, and how it can be modified to takesoft-input into account. Numerical examples illustrate its performanceon slowly fading 4x4 and 6x6 complex MIMO channels.
Place, publisher, year, edition, pages
2008. Vol. 56, no 8(1), 3397-3407 p.
Detection, MIMO, soft information
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-22005DOI: 10.1109/TSP.2008.925260OAI: oai:DiVA.org:liu-22005DiVA: diva2:242306
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Erik G. Larsson and Joakim Jaldén, Fixed-Complexity Soft MIMO Detection via Partial Marginalization, 2008, IEEE Transactions on Signal Processing, (56), 8(1), 3397-3407.