Optimal switching thresholds for space-time block coded rate-adaptive M-QAM

Youngwook Ko, Cihan Tepedelenlioglu

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

6 Scopus citations

Abstract

Channel state information (CSI) at the transmitter can be used to adapt transmission rate or antenna gains to time-varying fading channels in multi-antenna systems. However, the CSI that is fed back will get outdated if the channel is changing rapidly. We have developed a rate-adaptive M-QAM technique equipped with space-time block coding for multi-input multi-output (MIMO) systems and imperfect signal to noise ratio (SNR) feedback as opposed to the more complex full channel feedback in [6]. Based on the closed-form expressions for the average BER and average throughput derived in [6], we derive herein an optimal switching thresholds which maximize the average throughput under average BER constraint for MIMO fading channels. Our numerical results illustrate the immunity of our optimal thresholds to error due to time-delayed feedback.

Original languageEnglish (US)
Title of host publicationICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Volume4
StatePublished - 2004
EventProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada
Duration: May 17 2004May 21 2004

Other

OtherProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing
CountryCanada
CityMontreal, Que
Period5/17/045/21/04

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Signal Processing
  • Acoustics and Ultrasonics

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