Cell-Free Massive MIMO Systems With Multi-Antenna Users

Quang Duong; Trang Mai; Hien Quoc Ngo

doi:10.1109/GlobalSIP.2018.8646330

Cell-Free Massive MIMO Systems With Multi-Antenna Users

Quang Duong, Trang Mai, Hien Quoc Ngo

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

39 Citations (Scopus)

Abstract

In this paper, we investigate the impact of multiple-antenna deployment at access points (APs) and users on the performance of cell-free massive multiple-input multiple-output (MIMO). The transmission is done via time-division duplex (TDD) protocol. With this protocol, the channels are first estimated at each AP based on the received pilot signals in the training phase. Then these channel information will be used to decode the symbols before sending to all users. The simple and distributed conjugate beamforming technique is deployed. We derive a closed-form expression for the downlink spectral efficiency taking into account the imperfect channel state information (CSI), non-orthogonal pilots, and power control. This spectral efficiency can be achieved without the knowledge of instantaneous CSI at the users. In addition, the effects of the number antennas per APs and per users are analyzed in the case of using mutual orthogonal pilot sequences and data power control.

Original language	English
Title of host publication	6th IEEE Global Conference on Signal and Information Processing (GlobalSIP 2018): Proceedings
Place of Publication	Anahem, CA
Publisher	Institute of Electrical and Electronics Engineers Inc.
DOIs	https://doi.org/10.1109/GlobalSIP.2018.8646330
Publication status	Published - 21 Feb 2019

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title = "Cell-Free Massive MIMO Systems With Multi-Antenna Users",

abstract = "In this paper, we investigate the impact of multiple-antenna deployment at access points (APs) and users on the performance of cell-free massive multiple-input multiple-output (MIMO). The transmission is done via time-division duplex (TDD) protocol. With this protocol, the channels are first estimated at each AP based on the received pilot signals in the training phase. Then these channel information will be used to decode the symbols before sending to all users. The simple and distributed conjugate beamforming technique is deployed. We derive a closed-form expression for the downlink spectral efficiency taking into account the imperfect channel state information (CSI), non-orthogonal pilots, and power control. This spectral efficiency can be achieved without the knowledge of instantaneous CSI at the users. In addition, the effects of the number antennas per APs and per users are analyzed in the case of using mutual orthogonal pilot sequences and data power control.",

author = "Quang Duong and Trang Mai and Ngo, {Hien Quoc}",

year = "2019",

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doi = "10.1109/GlobalSIP.2018.8646330",

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T1 - Cell-Free Massive MIMO Systems With Multi-Antenna Users

AU - Duong, Quang

AU - Mai, Trang

AU - Ngo, Hien Quoc

PY - 2019/2/21

Y1 - 2019/2/21

N2 - In this paper, we investigate the impact of multiple-antenna deployment at access points (APs) and users on the performance of cell-free massive multiple-input multiple-output (MIMO). The transmission is done via time-division duplex (TDD) protocol. With this protocol, the channels are first estimated at each AP based on the received pilot signals in the training phase. Then these channel information will be used to decode the symbols before sending to all users. The simple and distributed conjugate beamforming technique is deployed. We derive a closed-form expression for the downlink spectral efficiency taking into account the imperfect channel state information (CSI), non-orthogonal pilots, and power control. This spectral efficiency can be achieved without the knowledge of instantaneous CSI at the users. In addition, the effects of the number antennas per APs and per users are analyzed in the case of using mutual orthogonal pilot sequences and data power control.

AB - In this paper, we investigate the impact of multiple-antenna deployment at access points (APs) and users on the performance of cell-free massive multiple-input multiple-output (MIMO). The transmission is done via time-division duplex (TDD) protocol. With this protocol, the channels are first estimated at each AP based on the received pilot signals in the training phase. Then these channel information will be used to decode the symbols before sending to all users. The simple and distributed conjugate beamforming technique is deployed. We derive a closed-form expression for the downlink spectral efficiency taking into account the imperfect channel state information (CSI), non-orthogonal pilots, and power control. This spectral efficiency can be achieved without the knowledge of instantaneous CSI at the users. In addition, the effects of the number antennas per APs and per users are analyzed in the case of using mutual orthogonal pilot sequences and data power control.

U2 - 10.1109/GlobalSIP.2018.8646330

DO - 10.1109/GlobalSIP.2018.8646330

M3 - Conference contribution

BT - 6th IEEE Global Conference on Signal and Information Processing (GlobalSIP 2018): Proceedings

PB - Institute of Electrical and Electronics Engineers Inc.

CY - Anahem, CA

ER -

Cell-Free Massive MIMO Systems With Multi-Antenna Users

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