Jointly gaussian approximation and multi-stage LLR combining in the iterative receiver for MIMO-BICM systems
Tao Yang
Jinhong Yuan
Zhenning Shi
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW;
This paper appears in: Wireless Communications, IEEE Transactions on
Publication Date: December 2008
Volume: 7,
Issue: 12, Part 2
On page(s): 5250-5256
ISSN: 1536-1276
INSPEC Accession Number: 10401663
Digital Object Identifier: 10.1109/T-WC.2008.071294
Current Version Published: 2008-12-22
Abstract
In this letter, we propose a new multi-stage LLR combining (MLC) algorithm in an iterative receiver for MIMOBICM systems. This algorithm combines the soft information from different receive antennas in a multi-stage fashion, where the combining factors are derived based on the joint likelihood function of bivariate Gaussian random variables. The variance transfer (VT) function of the proposed scheme is derived for performance analysis. For slow fading channels, we show that the proposed MLC algorithm can achieve almost the same performance as the linear minimum mean square error (LMMSE) filtering approach, whereas the computation-demanding matrix inverse for LMMSE can be avoided.
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