Optimized CSI feedback for robust THP design

Paula M. Castro, Michael Joham, Luis Castedo, Wolfgang Utschick

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

17 Scopus citations

Abstract

In the broadcast channel (BC), the signals of the multiple users can be separated by means of preceding. For the design of preceding, channel state information (CSI) is necessary at the transmitter side. In many cases (e.g., for frequency division duplex (FDD) systems), the transmitter cannot estimate this information and the CSI has to be communicated from the receivers to the transmitter via a feedback channel that is assumed to be error-free but introduces a delay. Every user estimates the channel and reduces it to a low-dimensional representation for data compression that is possible due to the channel correlations. Before the feedback, the CSI is quantized and only the index of the codebook entry is sent to the transmitter, since the data rate of the feedback channel is limited. We propose a joint MSE optimization of the channel estimation and the rank reduction basis, where the quantizer is modeled as a data independent additive noise source. Based on the fed back codebook index, robust multi-user preceding schemes, viz., linear precoding and Tomlinson Harashima precoding (THP), are designed that clearly outperform non-robust schemes.

Original languageEnglish
Title of host publicationConference Record of the 41st Asilomar Conference on Signals, Systems and Computers, ACSSC
Pages1956-1960
Number of pages5
DOIs
StatePublished - 2007
Event41st Asilomar Conference on Signals, Systems and Computers, ACSSC - Pacific Grove, CA, United States
Duration: 4 Nov 20077 Nov 2007

Publication series

NameConference Record - Asilomar Conference on Signals, Systems and Computers
ISSN (Print)1058-6393

Conference

Conference41st Asilomar Conference on Signals, Systems and Computers, ACSSC
Country/TerritoryUnited States
CityPacific Grove, CA
Period4/11/077/11/07

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