Title :
Adaptive MIMO Systems in 2 x 2 Uncorrelated Rayleigh Fading Channel
Author :
Huang, Jinliang ; Signell, Svante
Author_Institution :
Sch. of Inf. & Commun. Technol., R. Inst. of Technol., Stockholm
Abstract :
Adaptive MQAM modulation is used to maximize spectral efficiency while keeping bit error rate (BER) under a target level. The closed-form expressions of the average spectral efficiency of adaptive modulation system are derived for beamforming (BF), singular value decomposition (SVD), space-time block coding (STBC) and spatial multiplexing with zero-forcing (ZF) receiver in uncorrelated flat Rayleigh fading channel. Further, a low-complexity adaptive scheme that switches across BF and SVD in closed loop systems, STBC and ZF in open loop systems is suggested to enhance the spectral efficiency on the basis of the closed form expressions.
Keywords :
MIMO communication; Rayleigh channels; adaptive modulation; array signal processing; block codes; error statistics; quadrature amplitude modulation; singular value decomposition; space-time codes; BER; Rayleigh fading channel; STBC; SVD; adaptive MIMO systems; adaptive MQAM modulation; adaptive modulation system; beamforming; bit error rate; low-complexity adaptive scheme; open loop systems; singular value decomposition; space-time block coding; spatial multiplexing; spectral efficiency; zero-forcing receiver; Adaptive systems; Array signal processing; Bit error rate; Block codes; Closed-form solution; Fading; MIMO; Modulation coding; Optical modulation; Singular value decomposition;
Conference_Titel :
Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE
Conference_Location :
Kowloon
Print_ISBN :
1-4244-0658-7
Electronic_ISBN :
1525-3511
DOI :
10.1109/WCNC.2007.211
