Title :
Impact of Outdated Feedback on the Performance of M-QAM Adaptive Modulation in User Selection Diversity Systems with OSTBC over MIMO Rayleigh Fading Channels
Author :
Torabi, Mohammad ; Frigon, Jean-François
Author_Institution :
Dept. of Electr. Eng., Ecole Polytech. de Montreal, Montréal, QC, Canada
Abstract :
This paper presents an evaluation of the impact of channel time variations on performance of multiuser selection diversity systems employing orthogonal space-time block coding (OSTBC) over MIMO Rayleigh fading channels. A rate-adaptive M-QAM modulation along with the maximum signal-to-noise ratio (SNR) based user selection diversity is considered. Analytical expressions are derived for the average spectral efficiency, average bit error rate (BER), and bit error outage (BEO) of the system. Using the results obtained from the analytical expressions as well as from Monte-Carlo simulations, the impact of channel time variations on the system performance is evaluated.
Keywords :
MIMO communication; Monte Carlo methods; Rayleigh channels; adaptive modulation; error statistics; orthogonal codes; quadrature amplitude modulation; space-time block codes; BEO system; BER; MIMO Rayleigh fading channels; Monte-Carlo simulation; OSTBC; SNR; bit error outage; bit error rate; channel time variation; multiuser selection diversity system; orthogonal space-time block coding; rate-adaptive M-QAM modulation; signal-to-noise ratio; spectral efficiency; Bit error rate; Delay; Fading; MIMO; Modulation; Performance analysis; Signal to noise ratio;
Conference_Titel :
Vehicular Technology Conference (VTC Fall), 2012 IEEE
Conference_Location :
Quebec City, QC
Print_ISBN :
978-1-4673-1880-8
Electronic_ISBN :
1090-3038
DOI :
10.1109/VTCFall.2012.6399341
