Analysis of higher-order N-tone sigma-delta modulators for ultra wideband communications

Author

Chang, Kai-Chuan ; Sobelman, Gerald E. ; Saberinia, Ebrahim ; Tewfik, Ahmed H.

Author_Institution

Dept. of Electr. & Comput. Eng., Minnesota Univ., Minneapolis, MN, USA

Volume

4

fYear

2004

fDate

23-26 May 2004

Abstract

We consider the properties of a class of non-oversampling N-tone sigma-delta modulators which have applications in the design of UWB-OFDM communications systems. The spectrum gaps that exist in such systems are well-matched to the noise shaping properties of these modulators and their non-oversampling nature makes them practical for use with these ultra wideband signals. Performance results for first-order, second-order and L^th-order modulators are presented, and a general expression for the excess resolution that can be gained in such systems is obtained.

Keywords

OFDM modulation; broadband networks; quantisation (signal); sigma-delta modulation; signal sampling; Lth-order modulators; UWB-OFDM communications system; first order modulators; higher order N-tone sigma-delta modulator; noise shaping properties; nonoversampling; orthogonal frequency division multiplexing; second order modulators; spectrum gaps; ultrawideband communication; Application software; Delta-sigma modulation; Frequency; Noise figure; Noise reduction; Noise shaping; Pulse modulation; Quantization; Signal resolution; Ultra wideband technology;

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.2004.1328953

Filename

1328953