Comparison of multiuser diversity using STBC and transmit beamforming with outdated feedback

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

For multiuser diversity systems employing adaptive modulation, we compare the spectral efficiency for space-time block coding (STBC) and transmit beamforming (BF) with outdated channel feedback. Taking into account the channel feedback delay, we derive the optimal thresholds to maximize spectral efficiency subject to an average BER constraint, and illustrate the impact of feedback delay on the achievable multiuser diversity gain with either STBC or BF. We observe that more transmit antennas bring higher spectral efficiency for BF. But this becomes inverted using STBC, due to the effect of channel-hardening [1]. With a small feedback delay, the BF scheme outperforms the STBC scheme. However, when feedback delay becomes large enough, the STBC scheme achieves higher spectral efficiency due to the reduced diversity order of BF.

Original languageEnglish (US)
Title of host publication2005 IEEE International Conference on Acoustics, Speech, and Signal Processing,ICASSP '05 - Proceedings - Audio and ElectroacousticsSignal Processing for Communication
PublisherInstitute of Electrical and Electronics Engineers Inc.
PagesIII1125-III1128
ISBN (Print)0780388747, 9780780388741
DOIs
StatePublished - Jan 1 2005
Event2005 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '05 - Philadelphia, PA, United States
Duration: Mar 18 2005Mar 23 2005

Publication series

NameICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
VolumeIII
ISSN (Print)1520-6149

Other

Other2005 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '05
CountryUnited States
CityPhiladelphia, PA
Period3/18/053/23/05

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ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

Cite this

Ma, Q., & Tepedelenlioglu, C. (2005). Comparison of multiuser diversity using STBC and transmit beamforming with outdated feedback. In 2005 IEEE International Conference on Acoustics, Speech, and Signal Processing,ICASSP '05 - Proceedings - Audio and ElectroacousticsSignal Processing for Communication (pp. III1125-III1128). [1415912] (ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings; Vol. III). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICASSP.2005.1415912