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Deep Learning-Based Robust Precoding for Massive MIMO.

Authors :
Shi, Junchao
Wang, Wenjin
Yi, Xinping
Gao, Xiqi
Li, Geoffrey Ye
Source :
IEEE Transactions on Communications. Nov2021, Vol. 69 Issue 11, p7429-7443. 15p.
Publication Year :
2021

Abstract

In this paper, we consider massive multiple-input-multiple-output (MIMO) communication systems with a uniform planar array (UPA) at the base station (BS) and investigate the downlink precoder design with imperfect channel state information (CSI). By exploiting channel estimates and statistical parameters of channel estimation error, we aim to design precoding vectors to maximize the utility function on the ergodic rates of users subject to a total transmit power constraint. By employing an upper bound of the ergodic rate, we leverage the corresponding Lagrangian formulation and identify the structural characteristics of the optimal precoder as the solution to a generalized eigenvalue problem. The Lagrange multipliers play a crucial role in determining both precoding directions and power parameters, yet are challenging to be solved directly. To figure out the Lagrange multipliers, we develop a general framework underpinned by a properly designed neural network that learns directly from CSI. To further relieve the computational burden, we obtain a low-complexity framework by decomposing the original problem into computationally efficient subproblems with instantaneous and statistical CSI handled separately. With the offline pre-trained neural network, the online computational complexity of precoder is substantially reduced compared with the existing iterative algorithm while maintaining nearly the same performance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00906778
Volume :
69
Issue :
11
Database :
Academic Search Index
Journal :
IEEE Transactions on Communications
Publication Type :
Academic Journal
Accession number :
153711046
Full Text :
https://doi.org/10.1109/TCOMM.2021.3105569