Title :
SPC02-2: Joint Data Detection and Channel Estimation for MIMO-OFDM Systems via EM Algorithm and Sphere Decoding
Author :
Wang, Meng ; Quevedo, Daniel E. ; Goodwin, Graham C.
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Univ. of Newcastle, Callaghan, NSW
fDate :
Nov. 27 2006-Dec. 1 2006
Abstract :
We consider joint data detection and channel estimation for multiple-input multiple-output orthogonal frequency division multiplexing systems. The expectation maximization algorithm is employed to capture the dynamics of a time-varying fading channel and also to recover the channel input. This is done iteratively: channel estimates are updated in the E-step, whilst the sphere decoding algorithm is used in the M-step to realize data recovery. Initial channel estimates are obtained through the use of a small number of pilot symbols. We show by simulation that the performance of the proposed algorithm can approach coherent detection with reasonable computational complexity.
Keywords :
MIMO communication; OFDM modulation; channel coding; channel estimation; expectation-maximisation algorithm; fading channels; iterative decoding; time-varying channels; EM algorithm; MIMO-OFDM systems; channel estimation; channel input recovery; expectation maximization algorithm; joint data detection; multiple-input multiple-output; orthogonal frequency division multiplexing; sphere decoding; time-varying fading channel; Bandwidth; Channel estimation; Fading; Intersymbol interference; Iterative algorithms; Iterative decoding; MIMO; OFDM modulation; Receiving antennas; Transmitting antennas;
Conference_Titel :
Global Telecommunications Conference, 2006. GLOBECOM '06. IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
1-4244-0356-1
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2006.539
