On the Performance of Distributed Antenna Array Systems With Quasi-Orthogonal Pilots

Chowdhury, Anubhab and Sasmal, Pradip and Murthy, Chandra R. and et al, . (2022) On the Performance of Distributed Antenna Array Systems With Quasi-Orthogonal Pilots. IEEE Transactions on Vehicular Technology, 71 (3). pp. 3326-3331. ISSN 0018-9545

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In this paper, we address the problem of channel estimation in a single cell massive multiple-input multiple-output (mMIMO) system with distributed antenna arrays (DAA) under the availability of limited pilots. Specifically, we propose to use pilots that are not only orthogonal within a cluster but also minimally correlated across clusters. We show that pilot sets that form mutually unbiased orthonormal bases (MUOB) minimize both inter- and intra-cluster pilot contamination. This also allows us to optimally choose the number of pilots needed to serve a given number of user equipments (UEs) within a DAA-mMIMO system. Following this, we develop an access point (AP) centered UE clustering algorithm to optimally cluster UEs for MUOB pilot allocation. Our experiments reveal that in a DAA-mMIMO system, MUOB not only offers better fairness compared to the traditional orthogonal pilot reuse scheme in terms of channel estimation error and per-UE throughput, but also delivers a higher sum system throughput. © 1967-2012 IEEE.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Additional Information: This work was financially supported in part by the research Grants from Intel India and in part by the Young Faculty Research Fellowship from the Ministry of Electronics and Information Technology, Govt. of India.
Uncontrolled Keywords: Correlation; Distributed antenna arrays; Index; Massive MIMO; Multiple-Input Multiple- Output systems; Orthonormal basis; Performance; Pilot contaminations; Resource management; User equipments
Subjects: Electrical Engineering
Electrical Engineering > Wireless Communication
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 20 Jul 2022 11:37
Last Modified: 20 Jul 2022 11:37
URI: http://raiith.iith.ac.in/id/eprint/9606
Publisher URL: http://doi.org/10.1109/TVT.2022.3141597
OA policy: https://v2.sherpa.ac.uk/id/publication/3582
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