Multiuser feedback design with multiple receive antennas

Mario H. Castañeda, Josef A. Nossek

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

Abstract

In a frequency division duplex system with a base station equipped with multiple antennas, the base station relies on feedback of the channel state information of the users in order to perform user selection and transmit beamforming in the downlink. Nonetheless, it is usually assumed that the feedback link is noise-free, i.e. the base station has access to error-free feedback. In practice, however, the feedback link is the uplink of the system and is subject to fading, possible multiuser interference and noise. In this work, with a given amount of resources reserved for the feedback of all the users, we tackle the system feedback design considering feedback errors. We take into account that the base station can detect the feedback of several users simultaneously by employing receive beamforming. In addition, we propose to exploit multiuser diversity in the feedback link in order to minimize the feedback error probability. We also present an orthogonal pilot design which enables the base station to estimate the feedback (uplink) channels of the users.

Original languageEnglish
Title of host publication2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011
Pages436-440
Number of pages5
DOIs
StatePublished - 2011
Event2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011 - San Francisco, CA, United States
Duration: 26 Jun 201129 Jun 2011

Publication series

NameIEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC

Conference

Conference2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011
Country/TerritoryUnited States
CitySan Francisco, CA
Period26/06/1129/06/11

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