Deep Learning for Distributed Channel Feedback and Multiuser Precoding in FDD Massive MIMO

This paper shows that deep neural network (DNN) can be used for efficient and distributed channel estimation, quantization, feedback, and downlink multiuser precoding for a frequency-division duplex massive multiple-input multiple-output system in which a base station (BS) serves multiple mobile use...

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Veröffentlicht in:IEEE transactions on wireless communications Jg. 20; H. 7; S. 4044 - 4057
Hauptverfasser: Sohrabi, Foad, Attiah, Kareem M., Yu, Wei
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.07.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Artificial neural networks
Channel estimation
Deep learning
deep neural network (DNN)
distributed source coding (DSC)
Downlink
downlink precoding
Estimation
Feedback
feedback frequency-division duplex (FDD)
Frequency division duplexing
Machine learning
massive multiple-input multiple-output (MIMO)
Precoding
quantization
Quantization (signal)
Radio equipment
Robust design
Training
ISSN:1536-1276, 1558-2248
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Zusammenfassung:This paper shows that deep neural network (DNN) can be used for efficient and distributed channel estimation, quantization, feedback, and downlink multiuser precoding for a frequency-division duplex massive multiple-input multiple-output system in which a base station (BS) serves multiple mobile users, but with rate-limited feedback from the users to the BS. A key observation is that the multiuser channel estimation and feedback problem can be thought of as a distributed source coding problem. In contrast to the traditional approach where the channel state information (CSI) is estimated and quantized at each user independently, this paper shows that a joint design of pilots and a new DNN architecture, which maps the received pilots directly into feedback bits at the user side then maps the feedback bits from all the users directly into the precoding matrix at the BS, can significantly improve the overall performance. This paper further proposes robust design strategies with respect to channel parameters and also a generalizable DNN architecture for varying number of users and number of feedback bits. Numerical results show that the DNN-based approach with short pilot sequences and very limited feedback overhead can already approach the performance of conventional linear precoding schemes with full CSI.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2021.3055202