Title :
An alias-free subband adaptive equalizer for OFDM system
Author :
Miyagi, Tomohide ; Ochi, Hiroshi
Author_Institution :
Fac. of Inf. Eng., Kyushu Inst. of Technol., Fukuoka, Japan
Abstract :
We propose a subband adaptive digital filter (SBADF) for an orthogonal frequency division multiplexing (OFDM) system. The proposed SBADF is able to carry out the exact system identification without the degradation effect of both the aliasing and the cross terms even under critical sub-sampling. The inverse transfer function of the channel can be directly implemented after the system identification. The advantage of the proposed SBADF based equalizer is that it is not necessary to take account of the delay in terms of the transmission path because of the frequency-domain equalization. Some simulation results show the efficiency of the proposed SBADF for an OFDM system
Keywords :
OFDM modulation; adaptive equalisers; adaptive filters; channel bank filters; digital filters; discrete Fourier transforms; frequency-domain analysis; identification; signal sampling; telecommunication channels; transfer functions; DFT filter bank; OFDM system; alias-free subband adaptive equalizer; critical sub-sampling; frequency-domain equalization; inverse transfer function; multicarrier modulation; orthogonal frequency division multiplexing system; subband adaptive digital filter; system identification; transmission path; Adaptive equalizers; Degradation; Delay; Digital filters; Electronic mail; Frequency conversion; OFDM modulation; System identification; Transmitters; Wireless LAN;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.940487
