Title :
Impact of channel estimation error on performance of adaptive MIMO systems
Author :
Huang, Jinliang ; Signell, Svante
Author_Institution :
KTH, R. Inst. of Technol., 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 the spectral efficiency while maintaining the bit-error-rate (BER) under a target level. In this work, we investigate the performance of adaptive modulation in the presence of imperfect channel estimation and the impact of estimation noise on the spectral efficiency. The closed-form expressions for the average spectral efficiency are derived. Two MIMO schemes are considered, i.e., orthogonal space-time block codes (OSTBC) and spatial multiplexing with zero-forcing receiver (SM-ZF), and a low complexity method to enable the transmitter to switch between OSTBC and SM-ZF is utilized to achieve higher spectral efficiency than adaptive OSTBC and adaptive SM-ZF.
Keywords :
MIMO communication; adaptive modulation; block codes; channel estimation; error statistics; space-time codes; adaptive MIMO systems; adaptive modulation scheme; bit-error-rate; channel estimation error; communication system management; communication system operations; communication system performance; estimation noise; imperfect channel estimation; multiple-input multiple-output systems; orthogonal space-time block codes; spatial multiplexing; spectral efficiency; zero-forcing receiver; Adaptive systems; Bit error rate; Channel estimation; Closed-form solution; Feedback; MIMO; 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.2008.4518247
