Impact of Channel Non-Reciprocity in Cell-Free Massive MIMO

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Impact of Channel Non-Reciprocity in Cell-Free Massive MIMO. / Morte Palacios, Jorge; Raeesi, Orod; Gokceoglu, Ahmet; Valkama, Mikko.

julkaisussa: IEEE Wireless Communications Letters, 22.11.2019.

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Morte Palacios, Jorge ; Raeesi, Orod ; Gokceoglu, Ahmet ; Valkama, Mikko. / Impact of Channel Non-Reciprocity in Cell-Free Massive MIMO. Julkaisussa: IEEE Wireless Communications Letters. 2019.

Bibtex - Lataa

@article{e1a4472a7af94b569421b2f23088895c,

title = "Impact of Channel Non-Reciprocity in Cell-Free Massive MIMO",

abstract = "In cell-free (CF) massive MIMO, a large number of access points (APs) distributed over the coverage area jointly serve a set of users over the same time/frequency resources. In this paper, we study the impact of channel non-reciprocity (NRC) and imperfect channel state information in CF massive MIMO systems. We derive analytical expressions of capacity lower bounds, including a physically inspired non-reciprocal channel model where the NRC variables vary slowly in time. The conclusion is that under conjugate beamforming, the achievable downlink rate is only sensitive to AP side phase non-reciprocity, hence the calibration requirements can be less restrictive since only the phase reciprocity errors have to be corrected. These findings are new compared to the existing literature where the NRC variables are commonly assumed to be of fast-fading nature.",

keywords = "Cell-free massive MIMO, channel reciprocity, conjugate beamforming, frequency response mismatch, maximum-ratio processing, channel hardening.",

author = "{Morte Palacios}, Jorge and Orod Raeesi and Ahmet Gokceoglu and Mikko Valkama",

note = "INT=ELEN, {"}Morte Palacios, Jorge{"} EXT={"}Raeesi, Orod{"}",

year = "2019",

month = "11",

day = "22",

doi = "10.1109/LWC.2019.2954513",

language = "English",

journal = "IEEE Wireless Communications Letters",

issn = "2162-2337",

publisher = "Institute of Electrical and Electronics Engineers",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Impact of Channel Non-Reciprocity in Cell-Free Massive MIMO

AU - Morte Palacios, Jorge

AU - Raeesi, Orod

AU - Gokceoglu, Ahmet

AU - Valkama, Mikko

N1 - INT=ELEN, "Morte Palacios, Jorge" EXT="Raeesi, Orod"

PY - 2019/11/22

Y1 - 2019/11/22

N2 - In cell-free (CF) massive MIMO, a large number of access points (APs) distributed over the coverage area jointly serve a set of users over the same time/frequency resources. In this paper, we study the impact of channel non-reciprocity (NRC) and imperfect channel state information in CF massive MIMO systems. We derive analytical expressions of capacity lower bounds, including a physically inspired non-reciprocal channel model where the NRC variables vary slowly in time. The conclusion is that under conjugate beamforming, the achievable downlink rate is only sensitive to AP side phase non-reciprocity, hence the calibration requirements can be less restrictive since only the phase reciprocity errors have to be corrected. These findings are new compared to the existing literature where the NRC variables are commonly assumed to be of fast-fading nature.

AB - In cell-free (CF) massive MIMO, a large number of access points (APs) distributed over the coverage area jointly serve a set of users over the same time/frequency resources. In this paper, we study the impact of channel non-reciprocity (NRC) and imperfect channel state information in CF massive MIMO systems. We derive analytical expressions of capacity lower bounds, including a physically inspired non-reciprocal channel model where the NRC variables vary slowly in time. The conclusion is that under conjugate beamforming, the achievable downlink rate is only sensitive to AP side phase non-reciprocity, hence the calibration requirements can be less restrictive since only the phase reciprocity errors have to be corrected. These findings are new compared to the existing literature where the NRC variables are commonly assumed to be of fast-fading nature.

KW - Cell-free massive MIMO

KW - channel reciprocity

KW - conjugate beamforming

KW - frequency response mismatch

KW - maximum-ratio processing

KW - channel hardening.

U2 - 10.1109/LWC.2019.2954513

DO - 10.1109/LWC.2019.2954513

M3 - Article

JO - IEEE Wireless Communications Letters

JF - IEEE Wireless Communications Letters

SN - 2162-2337

ER -

TUTCRIS