Title :
EM-based channel estimation for OFDM
Author :
Ma, Xiaoqiang ; Kobayashi, Hisashi ; Schwartz, Stuart C.
Author_Institution :
Dept. of Electr. Eng., Princeton Univ., NJ, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
Estimating a channel that is subject to frequency selective Rayleigh fading is a challenging problem in an orthogonal frequency division multiplexing (OFDM) system. We propose an EM-based iterative algorithm to efficiently estimate the channel impulse response (CIR) of an OFDM system. This algorithm is capable of improving the channel estimate by making use of pilot tones to obtain the initial estimate for iterative steps. Simulation results show that the bit error rate (BER) can be significantly reduced by this algorithm
Keywords :
AWGN; OFDM modulation; Rayleigh channels; error statistics; iterative methods; multipath channels; optimisation; parameter estimation; AWGN; BER; EM-based channel estimation; EM-based iterative algorithm; OFDM; additive white Gaussian noise; bit error rate; channel impulse response; expectation-maximization algorithm; frequency selective Rayleigh fading; multipath fading channels; orthogonal frequency division multiplexing; pilot tones; simulation results; Baseband; Bit error rate; Channel estimation; Frequency estimation; Frequency response; Iterative algorithms; Lattices; OFDM; Rayleigh channels; Signal to noise ratio;
Conference_Titel :
Communications, Computers and signal Processing, 2001. PACRIM. 2001 IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
0-7803-7080-5
DOI :
10.1109/PACRIM.2001.953666
