A Low-Complexity Hybrid Linear and Nonlinear Precoder for Line-Of-Sight Massive MIMO With Max-Min Power Control

In line-of-sight (LOS) massive MIMO, there is a nonnegligible probability that the channel vectors of some users become correlated. In these correlated scenarios, nonlinear precoders can be used instead of linear precoders at the cost of high computational complexity. To reduce the complexity of non...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 20; no. 12; pp. 8410 - 8422
Main Authors: Farsaei, Amirashkan, Gustavsson, Ulf, Alvarado, Alex, Willems, Frans M. J.
Format: Journal Article
Language:English
Published: New York IEEE 01.12.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
5G New Radio
Codes
Complexity
Constellations
Correlation
Covariance matrices
Design modifications
Error correcting codes
hybrid linear and nonlinear precoding
Interference
Line of sight
line-of-sight environments
linear precoding
low-density parity-check codes
Massive MIMO
MIMO (control systems)
MIMO communication
Power control
Precoding
Signal to noise ratio
Tomlinson-Harashima precoding
Wireless communication
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Summary:In line-of-sight (LOS) massive MIMO, there is a nonnegligible probability that the channel vectors of some users become correlated. In these correlated scenarios, nonlinear precoders can be used instead of linear precoders at the cost of high computational complexity. To reduce the complexity of nonlinear precoders, hybrid linear and nonlinear precoders have been suggested in 5G New Radio (NR). In this paper, we find the probability that there is at least one pair of correlated users and we find the average number of correlated users. We propose a hybrid linear and nonlinear precoder (HLNP) with max-min power control for which the served users are divided into two groups. By employing a proposed modified Tomlinson-Harashima Precoding (THP), we design and combine the transmit vectors of the two groups such that inter-group interference is removed. Simulation results show that by employing HLNP instead of zero-forcing, the required transmit power to assure a given average block error rate (BLER) with 95% probability is reduced. For a 64-antennas BS, when modified THP is used for 3 out of 10 users in HLNP, the transmit power is reduced by up to 4.70 dB to assure an average BLER of 10 −2 using 16QAM and 64QAM constellations with NR low-density parity-check codes.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2021.3092965