Orthogonal space-time block coded rate-adaptive modulation with outdated feedback

Authors:
Y. Ko;C. Tepedelenlioglu
Affiliations:
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA;-
Venue:
IEEE Transactions on Wireless Communications
Year:
2006

Citing 0
Cited 2

Adaptive modulation for MIMO spatial multiplexing systems with zero-forcing receivers in semi-correlated Rayleigh fading channels

Proceedings of the 2006 international conference on Wireless communications and mobile computing
Superposition-based adaptive modulated space time block coding for MIMO-OFDM systems

IEEE Communications Letters

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Abstract

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 We propose a rate-adaptive M-QAM scheme equipped with orthogonal space-time block coding with simple outdated, finite-rate feedback over independent flat fading channels.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We derive optimal switching thresholds maximizing the average throughput under average and outage BER constraints with outdated feedback.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.