Title :
A study on noise canceling system based on adaptive filter for OFDM system
Author :
Kinoshita, M. ; Sasaoka, N. ; Danno, S. ; Itoh, Y. ; Sai, B.
Author_Institution :
Fac. of Eng., Tottori Univ., Japan
Abstract :
The orthogonal frequency division multiplexing (OFDM) system is widely studied for realizing high-speed wireless communications in recent years. In OFDM system, the frequency domain equalizer is used in order to compensate the signal degradation by a multipath. However, the estimation accuracy of channel response is deteriorated by the additive white Gaussian noise (AWGN). In order to solve the problem, we propose the noise canceling system based on an adaptive filter. An OFDM signal is periodic with a period of fast Fourier transform (FFT). Therefore, the current OFDM signal has high correlation with the signal shifted by the period of FFT. On the other hand, the current AWGN is not correlated with the AWGN shifted by the period of FFT. In the proposed system, the AWGN is canceled by taking advantage of the difference between the autocorrelation of the OFDM signal and the autocorrelation of the AWGN.
Keywords :
AWGN channels; OFDM modulation; adaptive filters; equalisers; fast Fourier transforms; interference suppression; multipath channels; OFDM system; adaptive filter; additive white Gaussian noise; channel response; fast Fourier transform; frequency domain equalizer; noise canceling system; orthogonal frequency division multiplexing; wireless communications; AWGN; Adaptive filters; Additive white noise; Autocorrelation; Equalizers; Frequency domain analysis; Gaussian noise; Noise cancellation; OFDM; Wireless communication;
Conference_Titel :
Intelligent Signal Processing and Communication Systems, 2005. ISPACS 2005. Proceedings of 2005 International Symposium on
Print_ISBN :
0-7803-9266-3
DOI :
10.1109/ISPACS.2005.1595505
