Title :
Performance Analysis of Adaptive Modulation in Multiuser Selection Diversity Systems With OSTBC Over Time-Varying Channels
Author :
Torabi, Mohammad ; Frigon, Jean-François ; Sansò, Brunilde
Author_Institution :
Dept. of Electr. Eng., Ecole Polytech. de Montreal, Montréal, QC, Canada
fDate :
4/1/2012 12:00:00 AM
Abstract :
This letter analyzes the impact of feedback delay on the performance of multiuser selection diversity systems employing orthogonal space-time block coding (OSTBC) and rate adaptive modulation over time-varying MIMO Rayleigh fading channels. Rate-adaptive M -QAM modulation along with a user selection diversity is considered in this letter. Analytical expressions are derived for the average spectral efficiency, average bit error rate, and bit error outage probability of the system. Using the results obtained from the analytical expressions, as well as validation from Monte-Carlo simulations, the impact of feedback delay on the system performance is evaluated and discussed.
Keywords :
Monte Carlo methods; Rayleigh channels; adaptive modulation; channel coding; diversity reception; error statistics; orthogonal codes; quadrature amplitude modulation; space-time block codes; Monte-Carlo simulations; OSTBC; average bit error rate; bit error outage probability; feedback delay; multiuser selection diversity systems; orthogonal space-time block coding; rate-adaptive M-QAM modulation; time-varying MIMO Rayleigh fading channels; time-varying channels; Bit error rate; Delay; Fading; MIMO; Modulation; Signal to noise ratio; Wireless communication; Adaptive modulation; OSTBC MIMO; feedback delay; time-varying channel; user selection diversity;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2012.2187444
