Title :
EM Based Semi-Blind Beamforming Algorithm in MIMO-OFDM Systems
Author :
Zamiri-Jafarian, H. ; Bokharaiec-Najafee, S. ; Pasupathy, S.
Author_Institution :
Ferdowsi Univ., Mashhad
Abstract :
A new EM based semi-blind beamforming algorithm is proposed in this paper for multiple input multiple output (MIMO) systems in which orthogonal frequency division multiplexing (OFDM) technique is used. Employing singular value decomposition (SVD) technique, the semi-blind beam-forming algorithm eliminates space interference in an iterative manner by shaping antenna patterns in transmitter and receiver sides in frequency domain. A 16-QAM MIMO-OFDM system is considered for computer simulations in order to evaluate the performance of the new algorithm under different scenarios. The results show that the proposed algorithm outperforms subspace based semi-blind beamforming method.
Keywords :
MIMO communication; OFDM modulation; expectation-maximisation algorithm; quadrature amplitude modulation; singular value decomposition; antenna patterns shaping; computer simulations; expectation maximization; frequency domain; multiple input multiple output systems; orthogonal frequency division multiplexing; quadrature amplitude modulation; receiver; semiblind beamforming algorithm; singular value decomposition; space interference; transmitter; Array signal processing; Frequency domain analysis; Interference elimination; Iterative algorithms; MIMO; OFDM; Receiving antennas; Singular value decomposition; Transmitters; Transmitting antennas; Beamforming; Expectation Maximization Algorithm; MIMO; OFDM; SVD; Semi-blind;
Conference_Titel :
Communications, Computers and Signal Processing, 2007. PacRim 2007. IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
978-1-4244-1189-4
DOI :
10.1109/PACRIM.2007.4313209
