Orthogonal space-time block coded rate-adaptive modulation with outdated feedbasck

Youngwook Ko, Cihan Tepedelenlioglu

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Abstract-Channel state information (CSI) at the transmitter can be used to adapt transmission rate or antenna gains in multi-antenna systems. We propose a rate-adaptive M-QAM scheme equipped with orthogonal space-time block coding with simple outdated, finite-rate feedback over independent flat fading channels. We obtain closed-form expressions for the average BER and throughput for our scheme, and analyze the effects of possibly delayed feedback on the performance gains. We derive optimal switching thresholds maximizing the average throughput under average and outage BER constraints with outdated feedback. Our numerical results illustrate the immunity of our optimal thresholds to delayed feedback.
Original languageEnglish
Pages (from-to)290
Number of pages295
JournalIEEE Transactions on Wireless Communications
Issue number2
Publication statusPublished - Feb 2006


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