Overview of Deep Learning-Based CSI Feedback in Massive MIMO Systems

Many performance gains achieved by massive multiple-input and multiple-output depend on the accuracy of the downlink channel state information (CSI) at the transmitter (base station), which is usually obtained by estimating at the receiver (user equipment) and feeding back to the transmitter. The ov...

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Bibliographic Details
Published in:IEEE transactions on communications 2022-12, Vol.70 (12), p.8017-8045
Main Authors: Guo, Jiajia, Wen, Chao-Kai, Jin, Shi, Li, Geoffrey Ye
Format: Article
Language:English
Subjects:
3GPP
Communication
Computer architecture
CSI feedback
Decoding
Deep learning
Downlink
Feedback
Image coding
Image reconstruction
Indexes
Massive MIMO
Neural networks
overview
State-of-the-art reviews
Training
Wireless communication systems
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Summary:Many performance gains achieved by massive multiple-input and multiple-output depend on the accuracy of the downlink channel state information (CSI) at the transmitter (base station), which is usually obtained by estimating at the receiver (user equipment) and feeding back to the transmitter. The overhead of CSI feedback occupies substantial uplink bandwidth resources, especially when the number of transmit antennas is large. Deep learning (DL)-based CSI feedback refers to CSI compression and reconstruction by a DL-based autoencoder and can greatly reduce feedback overhead. In this paper, a comprehensive overview of state-of-the-art research on this topic is provided, beginning with basic DL concepts widely used in CSI feedback and then categorizing and describing some existing DL-based feedback works. The focus is on novel neural network architectures and utilization of communication expert knowledge to improve CSI feedback accuracy. Works on joint design of CSI feedback with other communication modules are also introduced, and some practical issues, including bitstream generation, multirate feedback, imperfect feedback, NN complexity, training dataset collection, online training, and standardization effect, are discussed. At the end of the paper, some challenges and potential research directions associated with DL-based CSI feedback in future wireless communication systems are identified.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2022.3217777