A Low-Complexity QR Decomposition with Novel Modified RVD for MIMO Systems

Bin WU
Tianchun YE

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E104-A    No.5    pp.814-817
Publication Date: 2021/05/01
Publicized: 2020/11/02
Online ISSN: 1745-1337
DOI: 10.1587/transfun.2020EAL2090
Type of Manuscript: LETTER
Category: Digital Signal Processing
QR decomposition,  RVD,  Givens rotation,  MIMO detection,  

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In this letter, a two-stage QR decomposition scheme based on Givens rotation with novel modified real-value decomposition (RVD) is presented. With the modified RVD applied to the result from complex Givens rotation at first stage, the number of non-zero terms needed to be eliminated by real Givens rotation at second stage decreases greatly and the computational complexity is thereby reduced significantly compared to the decomposition scheme with the conventional RVD. Besides, the proposed scheme is suitable for the hardware design of QR decomposition. Evaluation shows that the proposed QR decomposition scheme is superior to the related works in terms of computational complexity.