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Optimal pilot design for pilot contamination elimination/reduction in large-scale multiple-antenna aided OFDM systems

Optimal pilot design for pilot contamination elimination/reduction in large-scale multiple-antenna aided OFDM systems
Optimal pilot design for pilot contamination elimination/reduction in large-scale multiple-antenna aided OFDM systems
This paper considers the problem of pilot contamination (PC) in large-scale multi-cell multiple-input multiple-output-aided orthogonal frequency division multiplexing systems. We propose an efficient scheme relying on an optimal pilot design conceived for time-domain channel estimation, which can either completely eliminate PC or significantly reduce it, depending on the channel’s coherence time. This is achieved by designing an optimal pilot set allowing us to beneficially group the users in all the cells and to assign a time-shifted pilot transmission to the different groups. Unlike the existing PC elimination schemes, which require an excessively long channel coherence time, our proposed scheme is capable of completely eliminating PC under a much shorter coherence time. Moreover, the existing PC elimination schemes can no longer be used if the channel coherent time is insufficiently large. By contrast, even for extremely short channel coherent time, our scheme can still be implemented to significantly reduce PC. This is particularly beneficial for high velocity scenarios. Our simulation results demonstrate the efficiency of the proposed scheme.
7229-7243
Guo, Xinying
941af9ec-ae51-4dd1-a3eb-85a2dc4058be
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Mu, Xiaomin
3d578909-36ba-4b16-b703-2ef63532116c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Guo, Xinying
941af9ec-ae51-4dd1-a3eb-85a2dc4058be
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Mu, Xiaomin
3d578909-36ba-4b16-b703-2ef63532116c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Guo, Xinying, Chen, Sheng, Zhang, Jiankang, Mu, Xiaomin and Hanzo, Lajos (2016) Optimal pilot design for pilot contamination elimination/reduction in large-scale multiple-antenna aided OFDM systems. IEEE Transactions on Wireless Communications, 15 (11), 7229-7243. (doi:10.1109/TWC.2016.2599171).

Record type: Article

Abstract

This paper considers the problem of pilot contamination (PC) in large-scale multi-cell multiple-input multiple-output-aided orthogonal frequency division multiplexing systems. We propose an efficient scheme relying on an optimal pilot design conceived for time-domain channel estimation, which can either completely eliminate PC or significantly reduce it, depending on the channel’s coherence time. This is achieved by designing an optimal pilot set allowing us to beneficially group the users in all the cells and to assign a time-shifted pilot transmission to the different groups. Unlike the existing PC elimination schemes, which require an excessively long channel coherence time, our proposed scheme is capable of completely eliminating PC under a much shorter coherence time. Moreover, the existing PC elimination schemes can no longer be used if the channel coherent time is insufficiently large. By contrast, even for extremely short channel coherent time, our scheme can still be implemented to significantly reduce PC. This is particularly beneficial for high velocity scenarios. Our simulation results demonstrate the efficiency of the proposed scheme.

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Accepted/In Press date: 24 July 2016
e-pub ahead of print date: 10 August 2016
Published date: November 2016
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 402664
URI: http://eprints.soton.ac.uk/id/eprint/402664
PURE UUID: 07dc7ee5-e448-4219-9cbe-9f84d47682d4
ORCID for Jiankang Zhang: ORCID iD orcid.org/0000-0001-5316-1711
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 14 Nov 2016 12:39
Last modified: 18 Feb 2021 17:13

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Contributors

Author: Xinying Guo
Author: Sheng Chen
Author: Jiankang Zhang ORCID iD
Author: Xiaomin Mu
Author: Lajos Hanzo ORCID iD

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