Uplink-downlink bidirectional training of multiuser MIMO filters and precoders

Mingguang Xu; Dongning Guo; Michael L Honig

doi:10.1109/Allerton.2011.6120258

Uplink-downlink bidirectional training of multiuser MIMO filters and precoders

Mingguang Xu^*, Dongning Guo, Michael L Honig

^*Corresponding author for this work

Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

Joint optimization of linear and nonlinear precoders and receive filters is considered for both the uplink/downlink in a single cell. The users and base station have multiple antennas and channel state information is initially unknown and not explicitly estimated. In the nonlinear case, for the uplink we assume successive interference cancellation at the base station, and for the downlink we assume that the base station pre-compensates for the interference with Tomlinson-Harashima precoding (THP). We assume time-division duplex with channel reciprocity, and estimate the filters directly with bidirectional training: the uplink feedforward/feedback filters at the base station are estimated via uplink training and are used as interference pre-compensation filters for downlink training of the mobile receivers. The filters are updated using a sum least squares criterion. We prove convergence of related iterative schemes in which the filters are updated according to a minimum mean squared error (MMSE) criterion, subject to different power constraints. Numerical results show that nonlinear filters can provide substantial gains relative to linear filters when the forward-backward iterations are limited.

Original language	English (US)
Title of host publication	2011 49th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2011
Pages	871-878
Number of pages	8
DOIs	https://doi.org/10.1109/Allerton.2011.6120258
State	Published - Dec 1 2011
Event	2011 49th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2011 - Monticello, IL, United States Duration: Sep 28 2011 → Sep 30 2011

Other

Other	2011 49th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2011
Country	United States
City	Monticello, IL
Period	9/28/11 → 9/30/11

ASJC Scopus subject areas

Computer Networks and Communications
Control and Systems Engineering

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10.1109/Allerton.2011.6120258

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title = "Uplink-downlink bidirectional training of multiuser MIMO filters and precoders",

abstract = "Joint optimization of linear and nonlinear precoders and receive filters is considered for both the uplink/downlink in a single cell. The users and base station have multiple antennas and channel state information is initially unknown and not explicitly estimated. In the nonlinear case, for the uplink we assume successive interference cancellation at the base station, and for the downlink we assume that the base station pre-compensates for the interference with Tomlinson-Harashima precoding (THP). We assume time-division duplex with channel reciprocity, and estimate the filters directly with bidirectional training: the uplink feedforward/feedback filters at the base station are estimated via uplink training and are used as interference pre-compensation filters for downlink training of the mobile receivers. The filters are updated using a sum least squares criterion. We prove convergence of related iterative schemes in which the filters are updated according to a minimum mean squared error (MMSE) criterion, subject to different power constraints. Numerical results show that nonlinear filters can provide substantial gains relative to linear filters when the forward-backward iterations are limited.",

author = "Mingguang Xu and Dongning Guo and Honig, {Michael L}",

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doi = "10.1109/Allerton.2011.6120258",

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note = "2011 49th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2011 ; Conference date: 28-09-2011 Through 30-09-2011",

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Xu, M, Guo, D & Honig, ML 2011, Uplink-downlink bidirectional training of multiuser MIMO filters and precoders. in 2011 49th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2011., 6120258, pp. 871-878, 2011 49th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2011, Monticello, IL, United States, 9/28/11. https://doi.org/10.1109/Allerton.2011.6120258

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N2 - Joint optimization of linear and nonlinear precoders and receive filters is considered for both the uplink/downlink in a single cell. The users and base station have multiple antennas and channel state information is initially unknown and not explicitly estimated. In the nonlinear case, for the uplink we assume successive interference cancellation at the base station, and for the downlink we assume that the base station pre-compensates for the interference with Tomlinson-Harashima precoding (THP). We assume time-division duplex with channel reciprocity, and estimate the filters directly with bidirectional training: the uplink feedforward/feedback filters at the base station are estimated via uplink training and are used as interference pre-compensation filters for downlink training of the mobile receivers. The filters are updated using a sum least squares criterion. We prove convergence of related iterative schemes in which the filters are updated according to a minimum mean squared error (MMSE) criterion, subject to different power constraints. Numerical results show that nonlinear filters can provide substantial gains relative to linear filters when the forward-backward iterations are limited.

AB - Joint optimization of linear and nonlinear precoders and receive filters is considered for both the uplink/downlink in a single cell. The users and base station have multiple antennas and channel state information is initially unknown and not explicitly estimated. In the nonlinear case, for the uplink we assume successive interference cancellation at the base station, and for the downlink we assume that the base station pre-compensates for the interference with Tomlinson-Harashima precoding (THP). We assume time-division duplex with channel reciprocity, and estimate the filters directly with bidirectional training: the uplink feedforward/feedback filters at the base station are estimated via uplink training and are used as interference pre-compensation filters for downlink training of the mobile receivers. The filters are updated using a sum least squares criterion. We prove convergence of related iterative schemes in which the filters are updated according to a minimum mean squared error (MMSE) criterion, subject to different power constraints. Numerical results show that nonlinear filters can provide substantial gains relative to linear filters when the forward-backward iterations are limited.

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