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Low-Complexity MIMO Detector with 1024-QAM

Citation Author(s):
Mohammad Mansour, Louay Jalloul, Ali Chehab
Submitted by:
Hadi Sarieddeen
Last updated:
23 February 2016 - 1:44pm
Document Type:
Presentation Slides
Document Year:
Hadi Sarieddeen


In this paper, dual layer multiple-input multiple-output (2x2 MIMO) systems that use the 1024-QAM modulation are studied. We build on the layered orthogonal lattice detector (LORD), which achieves optimal maximum-likelihood (ML) performance, but which has high complexity with 1024-QAM, and argue that the low-complexity version of LORD (LC-LORD) introduces a significant performance degradation, especially with high channel correlation. We propose several approaches that outperform LC-LORD at a lower complexity. These approaches are based on improving the location of a reduced region of search within a 1024-QAM, as well was optimizing the bit log likelihood ratio (LLR) approximation. The proposed approaches were studied in the context of non-iterative and iterative detection and decoding, and significant gains were achieved in both cases.

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GlobalSIP 2015 - 1024QAM - Hadi Sarieddeen.pdf