Space-time block coded rate-adaptive modulation with uncertain SNR feedback

Author

Ko, Youngwook ; Tepedelenlioglu, Cihan

Author_Institution

Dept. of Electr. Eng., Arizona State Univ., AZ, USA

Volume

1

fYear

2003

fDate

9-12 Nov. 2003

Firstpage

1032

Abstract

Channel state information (CSI) at the transmitter can be used to adapt transmission rate or antenna gains in multi-antenna systems. However, the CSI that is fed back will get outdated if the channel is changing rapidly. We propose a rate-adaptive M-QAM technique equipped with space-time block coding with signal to noise ratio (SNR) feedback as opposed to full channel feedback. We obtain closed-form expressions for the average BER and average throughput for our scheme. We illustrate the performance gains achievable through the rate adaptation and possibly delayed SNR feedback. Our numerical results illustrate the immunity of our proposed technique to error caused by time-delayed feedback.

Keywords

Rayleigh channels; adaptive modulation; antenna arrays; block codes; error statistics; feedback; modulation coding; quadrature amplitude modulation; radio transmitters; space-time codes; SNR feedback; antenna gains; bit error rate; channel state information; multi-antenna systems; quadrature amplitude modulation; rate-adaptive M-QAM technique; rate-adaptive modulation; signal to noise ratio; space-time block code; time-delayed feedback; transmission rate; Adaptive arrays; Bit error rate; Block codes; Channel state information; Closed-form solution; Feedback; Modulation coding; Signal to noise ratio; Transmitters; Transmitting antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2004. Conference Record of the Thirty-Seventh Asilomar Conference on

Print_ISBN

0-7803-8104-1

Type

conf

DOI

10.1109/ACSSC.2003.1292082

Filename

1292082