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Soft pilot reuse and multicell block diagonalization precoding for massive MIMO systems

Soft pilot reuse and multicell block diagonalization precoding for massive MIMO systems
Soft pilot reuse and multicell block diagonalization precoding for massive MIMO systems
The users at cell edge of a massive multiple-input multiple-output (MIMO) system suffer from severe pilot contamination, which leads to poor quality of service (QoS). In order to enhance the QoS for these edge users, soft pilot reuse (SPR) combined with multi-cell block diagonalization (MBD) precoding are proposed. Specifically, the users are divided into two groups according to their large-scale fading coefficients, referred to as the center users, who only suffer from modest pilot contamination and the edge users, who suffer from severe pilot contamination. Based on this distinction, the SPR scheme is proposed for improving the QoS for the edge users, whereby a cell-center pilot group is reused for all cell-center users in all cells, while a cell-edge pilot group is applied for the edge users in the adjacent cells. By extending the classical block diagonalization precoding to a multi-cell scenario, the MBD precoding scheme projects the downlink transmit signal onto the null space of the subspace spanned by the inter-cell channels of the edge users in adjacent cells. Thus, the inter-cell interference contaminating the edge users’ signals in the adjacent cells can be efficiently mitigated and hence the QoS of these edge users can be further enhanced. Our theoretical analysis and simulation results demonstrate that both the uplink and downlink rates of the edge users are significantly improved, albeit at the cost of the slightly decreased rate of center users.
massive multiple-input multiple-output system, inter-cell interference, multi-cell block diagonalization precoding, pilot contamination quality of service soft pilot reuse
0018-9545
1-30
Zhu, Xudong
3b49d319-11ee-4755-bb65-c5de5276021c
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Qian, Chen
2b85263f-c5ae-413e-a0d3-4c3abd84ff61
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Chen, Jinhui
ba3e7e76-75cb-4ce3-8f75-de0e9b4b5e02
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Zhu, Xudong
3b49d319-11ee-4755-bb65-c5de5276021c
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Qian, Chen
2b85263f-c5ae-413e-a0d3-4c3abd84ff61
Dai, Linglong
a3b9a8e1-777f-4196-a388-969444c7239d
Chen, Jinhui
ba3e7e76-75cb-4ce3-8f75-de0e9b4b5e02
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Zhu, Xudong, Wang, Zhaocheng, Qian, Chen, Dai, Linglong, Chen, Jinhui, Chen, Sheng and Hanzo, Lajos (2016) Soft pilot reuse and multicell block diagonalization precoding for massive MIMO systems. IEEE Transactions on Vehicular Technology, 65 (5), 1-30. (doi:10.1109/TVT.2015.2445795).

Record type: Article

Abstract

The users at cell edge of a massive multiple-input multiple-output (MIMO) system suffer from severe pilot contamination, which leads to poor quality of service (QoS). In order to enhance the QoS for these edge users, soft pilot reuse (SPR) combined with multi-cell block diagonalization (MBD) precoding are proposed. Specifically, the users are divided into two groups according to their large-scale fading coefficients, referred to as the center users, who only suffer from modest pilot contamination and the edge users, who suffer from severe pilot contamination. Based on this distinction, the SPR scheme is proposed for improving the QoS for the edge users, whereby a cell-center pilot group is reused for all cell-center users in all cells, while a cell-edge pilot group is applied for the edge users in the adjacent cells. By extending the classical block diagonalization precoding to a multi-cell scenario, the MBD precoding scheme projects the downlink transmit signal onto the null space of the subspace spanned by the inter-cell channels of the edge users in adjacent cells. Thus, the inter-cell interference contaminating the edge users’ signals in the adjacent cells can be efficiently mitigated and hence the QoS of these edge users can be further enhanced. Our theoretical analysis and simulation results demonstrate that both the uplink and downlink rates of the edge users are significantly improved, albeit at the cost of the slightly decreased rate of center users.

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More information

Accepted/In Press date: 17 June 2015
Published date: May 2016
Keywords: massive multiple-input multiple-output system, inter-cell interference, multi-cell block diagonalization precoding, pilot contamination quality of service soft pilot reuse
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 378622
URI: http://eprints.soton.ac.uk/id/eprint/378622
ISSN: 0018-9545
PURE UUID: d652f5aa-0eca-4da3-90b7-c03e3756d837
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 10 Jul 2015 13:26
Last modified: 17 Dec 2019 02:03

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Contributors

Author: Xudong Zhu
Author: Zhaocheng Wang
Author: Chen Qian
Author: Linglong Dai
Author: Jinhui Chen
Author: Sheng Chen
Author: Lajos Hanzo ORCID iD

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