Title :
Improved Channel Estimation in OFDM Systems with Synchronization Errors and Back-Off
Author :
Mahmoud, Hisham A. ; Arslan, Huseyin
Author_Institution :
Dept. of Electr. Eng., Univ. of South Florida, Tampa, FL
Abstract :
In orthogonal frequency division multiplexing (OFDM) systems, synchronization errors in the receiver cause a linear phase rotation at the output of the discrete Fourier transform (DFT) block. The correlation between the channel coefficients at different subcarriers is weakened due to this phase rotation. As a result, the performance of minimum mean-square error (MMSE) channel estimation degrades significantly. In this paper, we propose two novel algorithms to improve MMSE channel estimation under synchronization errors. Theoretical analysis and simulation results are presented to compare the performance of the proposed algorithms with that of the conventional algorithm.
Keywords :
OFDM modulation; channel estimation; discrete Fourier transforms; least mean squares methods; synchronisation; OFDM systems; back-off; channel coefficients; channel estimation; discrete Fourier transform; linear phase rotation; minimum mean-square error; orthogonal frequency division multiplexing systems; synchronization errors; Additive white noise; Channel estimation; Discrete Fourier transforms; Frequency estimation; Frequency synchronization; Gaussian noise; Noise reduction; OFDM; Performance analysis; Timing;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0062-7
Electronic_ISBN :
1-4244-0063-5
DOI :
10.1109/VTCF.2006.338
