Title :
Discrete Rate Spectral Efficiency Improvement by Scheme Switching for MIMO Systems
Author :
Huang, Jinliang ; Signell, Svante
Author_Institution :
R. Inst. of Technol., Stockholm
Abstract :
Adaptive modulation scheme has been widely used in multiple-input multiple-output (MIMO) systems to enhance spectral efficiency while maintaining the bit error rate (BER) under a target level. We consider two MIMO schemes, orthogonal space-time block codes (OSTBC) and spatial multiplexing with zero-forcing receiver (SM-ZF), that apply adaptive modulation scheme and derive closed-form expressions of the average spectral efficiency and BER. Based on the closed-form expression of spectral efficiency, a low complexity switching method is utilized to obtain high spectral efficiency gain over an adaptive system using a single scheme.
Keywords :
MIMO communication; block codes; error statistics; orthogonal codes; space-time codes; MIMO system; adaptive modulation scheme; bit error rate; orthogonal space-time block codes; spatial multiplexing; zero-forcing receiver; Adaptive systems; Bit error rate; Block codes; Closed-form solution; MIMO; OFDM; Rayleigh channels; Receiving antennas; Switches; Transmitters;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.751
