Title :
Discrete rate spectral efficiency for adaptive MIMO systems
Author :
Huang, Jinliang ; Signell, Svante
Author_Institution :
KTH - R. Inst. of Technol. Stockholm, Stockholm
fDate :
March 31 2008-April 4 2008
Abstract :
Adaptive modulation scheme has been widely used in multiple-input multiple-output (MIMO) systems to enhance spectral efficiency while maintaining 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 and derive closed-form expressions of the average spectral efficiency. Based on the closed-form expression of the average spectral efficiency, a low complexity switching method is utilized to gain significant improvement in spectral efficiency over an adaptive modulation system using a single MIMO scheme.
Keywords :
MIMO communication; block codes; computational complexity; error statistics; modulation coding; multiplexing; space-time codes; BER; adaptive MIMO systems; adaptive modulation system; average spectral efficiency; bit-error rate; closed-form expressions; complexity switching method; discrete rate spectral efficiency; multiple-input multiple-output; orthogonal space-time block codes; spatial multiplexing with zero-forcing receiver; spectral efficiency; Adaptive systems; Bit error rate; Block codes; Closed-form solution; MIMO; OFDM; Rayleigh channels; Receiving antennas; Switches; Transmitters; Communication system operations and management; Communication system performance; MIMO systems;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-1483-3
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2008.4518303
