Constructive Interference-Based Symbol-Level Precoding Design for Millimeter-Wave Massive Multiuser MIMO Systems With Hardware-Efficient Hybrid Precoding Architecture

Jung-Chieh Chen

doi:10.1109/access.2021.3054683

Jung-Chieh Chen

Open Access

https://doi.org/10.1109/access.2021.3054683

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Journal: IEEE Access	Publication Date: Jan 1, 2021
Citations: 28	License type: CC BY 4.0

Affiliation: National Kaohsiung Normal University

Abstract

This study considers the constructive interference-based symbol-level precoding design problem in millimeter-wave massive multiuser multiple-input multiple-output systems with hybrid analog-and-digital precoding architecture. In contrast to traditional hybrid precoding architecture in which the analog part is implemented by infinite-resolution phase shifters, analog precoders are achieved in this study using low-cost and energy-efficient switches and inverters. Our objective is to design a hybrid precoder that minimizes the Euclidean distance between the hybrid precoder and the optimal fully digital precoder. However, such a design problem is difficult due to the intricate coupling of digital and analog precoder variables. Thus, we apply the alternating minimization (AltMin) framework to decouple the considered problem into digital and analog precoder design problems and then solve for digital and analog precoders in an alternating manner. By adopting the AltMin framework, we obtain a closed-form solution for digital precoder. Nevertheless, solving the analog precoder design problem incurs combinatorial complexity, which we address by proposing a coordinate descent algorithm to sequentially update each element of the analog precoder with a closed-form expression. Simulation results reveal that the application of the proposed algorithm for the proposed hardware-efficient hybrid precoding architecture provides the desired balance among symbol error rate performance, power consumption, and hardware cost.

Highlights

Symbol-level precoding (SLP) that exploits the constructive interference (CI) technique has elicited considerable research interest in recent years [1]–[3]
Given that the users are equipped with a single antenna, the geometric channel model for this scenario can be expressed as [5], [13], [34], [38]–[42] is adopted in the simulation, which is given by hHu =
WORK Two major obstacles to the commercial deployment of mmWave massive MIMO systems with hybrid precoding architecture is its high hardware complexity and high power consumption, which are attributable to the use of numerous high-precision phase shifters (PSs)

Summary

Introduction

Symbol-level precoding (SLP) that exploits the constructive interference (CI) technique has elicited considerable research interest in recent years [1]–[3]. The associate editor coordinating the review of this manuscript and approving it for publication was Cong Pu. symbol detection performance. With this advantage, the concept of CI-based SLP has been applied to massive multiuser multiple-input-multiple-output (MU-MIMO) downlink systems with satisfactory performance [2]. A primary difficulty in implementing massive MU-MIMO downlink systems is their high hardware complexity, cost, and power consumption. To alleviate this difficulty, hybrid analog-and-digital beamforming architecture has been proposed [4]–[19].

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Conclusion