An Integrated Message-Passing Detector and Decoder for Polar-Coded Massive MU-MIMO Systems

For a coded massive multi-user multiple-input multiple-output (MIMO) system, a soft-output MIMO detector is essential since it can provide a significant coding gain, e.g., 3 dB, compared with a hard-output detector. However, the computational complexity of the soft-output MIMO detector is usually mu...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2019-03, Vol.66 (3), p.1205-1218
Main Authors: Chen, Yan-Tong, Sun, Wei-Cheng, Cheng, Chung-Chao, Tsai, Tsung-Lin, Ueng, Yeong-Luh, Yang, Chia-Hsiang
Format: Article
Language:English
Subjects:
Algorithms
belief propagation
Complexity
Complexity theory
Critical path
Decoding
Detectors
Encoding
Energy dissipation
inter-symbol interference cancellation
Interference cancellation
Massive MU-MIMO
Message passing
MIMO (control systems)
MIMO communication
polar codes
Propagation
Receivers
Sensors
State of the art
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Summary:For a coded massive multi-user multiple-input multiple-output (MIMO) system, a soft-output MIMO detector is essential since it can provide a significant coding gain, e.g., 3 dB, compared with a hard-output detector. However, the computational complexity of the soft-output MIMO detector is usually much greater than that of the hard-output detector. This paper presents the first soft-output message-passing detector (MPD), which is also integrated with a high-throughput polar decoder. The algorithm and architecture are designed concurrently to improve the hardware performance. The proposed techniques, including the adaptive variance estimation and reliable symbol detection, reduce the complexity of the MPD by 98.3%, and enable soft output for the outer polar decoder. Compared to the state-of-the-art hard-output design, the proposed MPD achieves a 5.86× higher throughput-to-area ratio (TAR) with 54.3% lower energy dissipation, despite the soft output. The proposed bidirectional-propagation belief propagation decoder is devised to reduce the critical path and to increase the throughput. The proposed polar decoder can improve the TAR by 35% with a comparable area and energy compared with the state-of-the-art polar decoder. A polar-coded massive MIMO receiver that supports a length-1024 rate-1/2 polar code, 128 receive antennas, and eight users is designed and implemented, and delivers a throughput of 7.61 Gb/s.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2018.2879860