Non-linear Transceiver Design for Broadcast Channels with Statistical Channel State Information

We consider the design of Tomlinson-Harashima (TH) transceivers for the downlink of a multiuser communication system in the presence of uncertain channel state information (CSI) at the base station. We consider systems in which the base station has multiple antennas and each user has a single antenn...

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Vydáno v:2007 IEEE International Symposium on Signal Processing and Information Technology s. 307 - 312
Hlavní autoři: Shenouda, M.B., Davidson, T.N.
Médium: Konferenční příspěvek
Jazyk:angličtina
Vydáno: IEEE 01.12.2007
Témata:
Base stations
Broadcasting
Channel state information
Decision feedback equalizers
Downlink
Measurement
Robustness
Stochastic systems
Transceivers
Uncertainty
ISBN:9781424418343, 1424418348
ISSN:2162-7843
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Abstract We consider the design of Tomlinson-Harashima (TH) transceivers for the downlink of a multiuser communication system in the presence of uncertain channel state information (CSI) at the base station. We consider systems in which the base station has multiple antennas and each user has a single antenna, and we consider a stochastic model for the uncertainty in the CSI. We study the joint design of a Tomlinson-Harashima precoder at the base station and the equalizing gains at the receivers so as to minimize the average, over channel uncertainty, of the total mean-square-error (MSE). By generalizing the MSE duality between the broadcast channel (BC) with TH preceding and the multiple access channel (MAC) with decision feedback equalization (DFE) to scenarios with uncertain CSI, we obtain a relation between the desired robust broadcast transceivers and the corresponding transceivers that optimize the same performance metric for the dual multiple access channel. Our simulations indicate that the proposed approach can significantly reduce the sensitivity of the downlink to uncertainty in the CSI, and can provide improved performance over that of existing robust designs.
AbstractList We consider the design of Tomlinson-Harashima (TH) transceivers for the downlink of a multiuser communication system in the presence of uncertain channel state information (CSI) at the base station. We consider systems in which the base station has multiple antennas and each user has a single antenna, and we consider a stochastic model for the uncertainty in the CSI. We study the joint design of a Tomlinson-Harashima precoder at the base station and the equalizing gains at the receivers so as to minimize the average, over channel uncertainty, of the total mean-square-error (MSE). By generalizing the MSE duality between the broadcast channel (BC) with TH preceding and the multiple access channel (MAC) with decision feedback equalization (DFE) to scenarios with uncertain CSI, we obtain a relation between the desired robust broadcast transceivers and the corresponding transceivers that optimize the same performance metric for the dual multiple access channel. Our simulations indicate that the proposed approach can significantly reduce the sensitivity of the downlink to uncertainty in the CSI, and can provide improved performance over that of existing robust designs.
Author Shenouda, M.B.
Davidson, T.N.
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  surname: Davidson
  fullname: Davidson, T.N.
  organization: McMaster Univ., Hamilton
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Snippet We consider the design of Tomlinson-Harashima (TH) transceivers for the downlink of a multiuser communication system in the presence of uncertain channel state...
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StartPage 307
SubjectTerms Base stations
Broadcasting
Channel state information
Decision feedback equalizers
Downlink
Measurement
Robustness
Stochastic systems
Transceivers
Uncertainty
Title Non-linear Transceiver Design for Broadcast Channels with Statistical Channel State Information
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