Title :
EM algorithm with sphere decoding for joint channel estimation and detection in MIMO systems
Author :
Tajalli, H. ; Hajiani, P. ; Shafiee, H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Tehran Univ., Iran
Abstract :
In this paper, we introduce a novel method for joint channel estimation and symbol detection in a MIMO wireless communication system. The algorithm uses the expectation-maximization (EM) algorithm for channel estimation, together with a new complex-domain sphere decoding (SD) algorithm for near-optimal detection of data symbols. The proposed algorithm is tested on a MIMO communication system. Simulation results show that, even with a short training sequence, the algorithm provides a near optimal performance with a reasonable computational complexity. We also compare the computational complexity of the proposed sphere decoding approach with other techniques and show that it has a lower computational complexity without any performance penalty.
Keywords :
MIMO systems; channel estimation; computational complexity; decoding; optimisation; radio networks; MIMO wireless communication system; complex-domain sphere decoding algorithm; computational complexity; expectation-maximization algorithm; joint channel estimation; symbol detection; Channel estimation; Computational complexity; Fading; Iterative algorithms; MIMO; Maximum likelihood decoding; Maximum likelihood detection; Receiving antennas; Transmitters; Transmitting antennas;
Conference_Titel :
Wireless and Optical Communications Networks, 2005. WOCN 2005. Second IFIP International Conference on
Print_ISBN :
0-7803-9019-9
DOI :
10.1109/WOCN.2005.1436081