DocumentCode :
418127
Title :
Time-domain constraints for the design of FRM-based cosine-modulated and modified DFT filter banks with a large number of bands and zero intersymbol interference
Author :
Furtado, Miguel B., Jr. ; Diniz, Paulo S R ; Netto, Sergio L. ; Saramaki, Tapio
Author_Institution :
Electr. Eng. Program, COPPE/Fed. Univ. of Rio de Janeiro, Brazil
Volume :
3
fYear :
2004
fDate :
23-26 May 2004
Abstract :
Orthogonal frequency division multiplexing (OFDM) is a transmultiplex (TMUX) technique characterized by a low computational complexity and reduced inter-symbol/inter-carrier interference (ISI/ICI). Recently, new TMUX structures based on multicarrier modulation have been proposed aiming at even better performances. Such new structures include a cosine-modulated filter bank (CMFB) and a modified DFT filter bank (MDFTB). This work introduces design techniques for the CMFB and MDFTB structures with a large number of subbands (several hundreds or more), zero ISI, and small levels of ICI for most practical applications. The design is based on the concept of an Mth-band Nyquist filter, which inherently yields zero ISI and a highly selective filter bank, and in the FRM structure enabling one to synthesize FIR filters with a significantly reduced number of coefficients. The prototype example filter is optimized to minimize the resulting ICI. A design example is included to illustrate the benefits of the proposed technique in filter bank applications demanding a very large number of channels.
Keywords :
FIR filters; OFDM modulation; channel bank filters; discrete Fourier transforms; intersymbol interference; transmultiplexing; FIR filters; Mth-band Nyquist filter; computational complexity; cosine-modulated filter bank; intercarrier interference; modified DFT filter bank; multicarrier modulation; orthogonal frequency division multiplexing; time-domain constraints; transmultiplex technique; zero intersymbol interference; Channel bank filters; Computational complexity; Digital communication; Filter bank; Finite impulse response filter; Interference constraints; Intersymbol interference; OFDM modulation; Prototypes; Time domain analysis;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
Type :
conf
DOI :
10.1109/ISCAS.2004.1328715
Filename :
1328715
Link To Document :
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