Low-Complexity Soft-Output Detection for Massive MIMO Using SCBiCG and Lanczos Methods

Massive MIMO is a promising technology to improve spectral efficiency, cell coverage, and system capacity for 5G. However, these benefits take place at great cost of computational complexity, especially in systems with hundreds of antennas at the base station. This paper aims to address the minimum...

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Bibliographic Details
Published in:China communications 2015-12, Vol.12 (S1), p.9-17
Main Authors: Xiao, Chiyang, Su, Xin, Zeng, Jie, Rong, Liping, Xu, Xibin, Wang, Jing
Format: Article
Language:English
Subjects:
Antennas
Computational complexity
detection
SCBiCG
Lanczos
low-complexity
Detectors
Lanczos
low-complexity
massive
massive MIMO
MIMO
MIMO
soft-output
SCBiCG
soft-output detection
Symmetric matrices
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Summary:Massive MIMO is a promising technology to improve spectral efficiency, cell coverage, and system capacity for 5G. However, these benefits take place at great cost of computational complexity, especially in systems with hundreds of antennas at the base station. This paper aims to address the minimum mean square error(MMSE) detection in uplink massive MIMO systems utilizing the symmetric complex bi-conjugate gradients(SCBiCG) and the Lanczos method. Both the proposed methods can avoid the large scale matrix inversion which is necessary for MMSE, thus, reducing the computational complexity by an order of magnitude with respect to the number of user equipment. To enable the proposed methods for soft-output detection, we also derive an approximating calculation scheme for the log-likelihood ratios(LLRs), which further reduces the complexity. We compare the proposed methods with existing exact and approximate detection methods. Simulation results demonstrate that the proposed methods can achieve near-optimal performance of MMSE detection with relatively low computational complexity.
ISSN:1673-5447
DOI:10.1109/CC.2015.7386166