Title :
The Spectral Efficiency of 2 × 2 Adaptive MIMO Systems in Spatially Correlated Rayleigh Fading Channel
Author :
Huang, Jinliang ; Signell, Svante
Author_Institution :
R. Inst. of Technol. (KTH), Stockholm
Abstract :
In need for high-speed data transmission over wireless channels, multiple-input multiple-output (MIMO) technology has been suggested as it exhibits significant improvement in channel capacity. In practice, adaptive modulation scheme can be applied in different MIMO algorithms to further improve the system efficiency. In this paper, we derive closed-form expressions for the spectral efficiency of MIMO system utilizing two algorithms: Orthogonal Space-Time Block Coding (OSTBC) and spatial multiplexing with zero-forcing (ZF) receiver. Furthermore, a low-complexity adaptive scheme that switches between OSTBC and ZF to achieve even a higher spectral efficiency is suggested based on the closed form expressions.
Keywords :
MIMO communication; Rayleigh channels; adaptive modulation; block codes; channel capacity; space-time codes; wireless channels; MIMO algorithms; adaptive MIMO systems; adaptive modulation scheme; channel capacity; high-speed data transmission; multiple-input multiple-output technology; orthogonal space-time block coding; spatial multiplexing; spatially correlated Rayleigh fading channel; spectral efficiency; wireless channels; zero-forcing receiver; Adaptive systems; Block codes; Channel capacity; Closed-form solution; Data communication; Fading; MIMO; OFDM; Space technology; Switches;
Conference_Titel :
Future Generation Communication and Networking (FGCN 2007)
Conference_Location :
Jeju
Print_ISBN :
0-7695-3048-6
DOI :
10.1109/FGCN.2007.218
