Vol. 77

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2018-12-29

Two-Stage Hybrid Precoding Algorithm Based on Switch Network for Millimeter Wave MIMO Systems

By Fulai Liu, Xiaodong Kan, Xiaoyu Bai, Ruiyan Du, and Yanshuo Zhang
Progress In Electromagnetics Research M, Vol. 77, 103-113, 2019
doi:10.2528/PIERM18102801

Abstract

Owing to the hardware cost and power consumption limitation, hybrid precoding has been recently considered as an alternative to the fully digital precoding in millimeter wave (mmWave) largescale multiple-input multiple-output (MIMO) systems. Although the number of radio frequency (RF) chains is reduced to a certain extent in the hybrid precoding structure, a great number of phase shifters are still needed. In this paper, we present a new hybrid precoding architecture based on switch network to decrease the power consumption of hybrid precoder by reducing the number of phase shifters greatly. The new hybrid precoding architecture consists of three parts, a digital precoder, an analog precoder, and a switch network, in which the switch network is used to offer a dynamic connection from phase shifters to antennas. Afterwards, a two-stage algorithm is proposed to determine each part of the hybrid precoding implementation. Speci cally, the product of the analog precoding matrix and digital precoding matrix is viewed as a whole matrix rstly, thereby the original problem is simplified into a two-variable problem which is relatively easy to be solved. Then, the decomposition of the analog precoding matrix and digital precoding matrix is considered in the second stage. Simulation results show that the presented implementation can not only provide a better trade-off between hardware complexity and system performance, but also achieve higher energy eciency with far fewer phase shifters than previous works.

Citation


Fulai Liu, Xiaodong Kan, Xiaoyu Bai, Ruiyan Du, and Yanshuo Zhang, "Two-Stage Hybrid Precoding Algorithm Based on Switch Network for Millimeter Wave MIMO Systems," Progress In Electromagnetics Research M, Vol. 77, 103-113, 2019.
doi:10.2528/PIERM18102801
http://www.jpier.org/PIERM/pier.php?paper=18102801

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