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Uplink Performance Analysis of Cell-Free mMIMO Systems under Channel Aging

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Uplink Performance Analysis of Cell-Free mMIMO Systems under Channel Aging. / Chopra, Ribhu; Murthy, Chandra R.; Papazafeiropoulos, Anastasios K.

In: IEEE Communications Letters, 2021.

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@article{77ab665cdeba482daa53e8c2c32d18f6,
title = "Uplink Performance Analysis of Cell-Free mMIMO Systems under Channel Aging",
abstract = "In this paper, we investigate the impact of channel aging on the uplink performance of a cell-free (CF) massive multiple-input multiple-output (mMIMO) system with a minimum mean squared error (MMSE) receiver. To this end, we present a new model for the temporal evolution of the channel, which allows the channel to age at different rates at different access points (APs). Under this setting, we derive the deterministic equivalent of the per-user achievable signal-to-interference-plus-noise ratio (SINR). In addition to validating the theoretical expressions, our simulation results reveal that, at low user mobilities, the SINR of CF-mMIMO is nearly 5 dB higher than its cellular counterpart with the same number of antennas, and about 8 dB higher than that of an equivalent small-cell network with the same number of APs. On the other hand, at very high user velocities, and when the channel between the UEs the different APs age at same rate, the relative impact of aging is higher for CF-mMIMO compared to cellular mMIMO. However, when the channel ages at the different APs with different rates, the effect of aging on CF-mMIMO is marginally mitigated, especially for larger frame durations.",
keywords = "Cell Free mMIMO, channel aging, performance analysis",
author = "Ribhu Chopra and Murthy, {Chandra R.} and Papazafeiropoulos, {Anastasios K.}",
note = "Publisher Copyright: IEEE Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",
year = "2021",
doi = "10.1109/LCOMM.2021.3073778",
language = "English",
journal = "IEEE Communications Letters",
issn = "1089-7798",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

RIS

TY - JOUR

T1 - Uplink Performance Analysis of Cell-Free mMIMO Systems under Channel Aging

AU - Chopra, Ribhu

AU - Murthy, Chandra R.

AU - Papazafeiropoulos, Anastasios K.

N1 - Publisher Copyright: IEEE Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021

Y1 - 2021

N2 - In this paper, we investigate the impact of channel aging on the uplink performance of a cell-free (CF) massive multiple-input multiple-output (mMIMO) system with a minimum mean squared error (MMSE) receiver. To this end, we present a new model for the temporal evolution of the channel, which allows the channel to age at different rates at different access points (APs). Under this setting, we derive the deterministic equivalent of the per-user achievable signal-to-interference-plus-noise ratio (SINR). In addition to validating the theoretical expressions, our simulation results reveal that, at low user mobilities, the SINR of CF-mMIMO is nearly 5 dB higher than its cellular counterpart with the same number of antennas, and about 8 dB higher than that of an equivalent small-cell network with the same number of APs. On the other hand, at very high user velocities, and when the channel between the UEs the different APs age at same rate, the relative impact of aging is higher for CF-mMIMO compared to cellular mMIMO. However, when the channel ages at the different APs with different rates, the effect of aging on CF-mMIMO is marginally mitigated, especially for larger frame durations.

AB - In this paper, we investigate the impact of channel aging on the uplink performance of a cell-free (CF) massive multiple-input multiple-output (mMIMO) system with a minimum mean squared error (MMSE) receiver. To this end, we present a new model for the temporal evolution of the channel, which allows the channel to age at different rates at different access points (APs). Under this setting, we derive the deterministic equivalent of the per-user achievable signal-to-interference-plus-noise ratio (SINR). In addition to validating the theoretical expressions, our simulation results reveal that, at low user mobilities, the SINR of CF-mMIMO is nearly 5 dB higher than its cellular counterpart with the same number of antennas, and about 8 dB higher than that of an equivalent small-cell network with the same number of APs. On the other hand, at very high user velocities, and when the channel between the UEs the different APs age at same rate, the relative impact of aging is higher for CF-mMIMO compared to cellular mMIMO. However, when the channel ages at the different APs with different rates, the effect of aging on CF-mMIMO is marginally mitigated, especially for larger frame durations.

KW - Cell Free mMIMO

KW - channel aging

KW - performance analysis

UR - http://www.scopus.com/inward/record.url?scp=85104679621&partnerID=8YFLogxK

U2 - 10.1109/LCOMM.2021.3073778

DO - 10.1109/LCOMM.2021.3073778

M3 - Article

AN - SCOPUS:85104679621

JO - IEEE Communications Letters

JF - IEEE Communications Letters

SN - 1089-7798

ER -