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Performance improvement of an optimal family of exponentially accurate sigma delta modulator
, Article International Conference on Signal Processing Proceedings, ICSP, 24 October 2010 through 28 October 2010, Beijing ; 2010 , Pages 1-4 ; 9781424458981 (ISBN) ; Beygiharchegani, S ; Marvasti, F ; Sharif University of Technology
2010
Abstract
In this paper a new iterative method is used to convert analog signals to digital (A/D) using sigma delta modulator (SDM). If intelligent reconstruction technique is used for decoding, either signals with higher bandwidth can be digitized or simpler circuitry can be utilized. An optimal family of SDM has recently been devised in order to improve performance of A/D converters. In this work, we improve performance of A/D converters even more, by combining this optimal family of SDM with iterative methods
An analog optimal waveform design for UWB communications
, Article Proceedings of the 2nd Asia Symposium on Quality Electronic Design, ASQED 2010, 3 August 2010 through 4 August 2010 ; August , 2010 , Pages 289-293 ; 9781424478088 (ISBN) ; Abrishamifar, A ; Medi, A ; Akbarzadeh, A ; Sharif University of Technology
2010
Abstract
A new optimal waveform for Ultra-wideband (UWB) radios is proposed in this paper. This new waveform extracted through mathematical analysis for achieving high spectral utilization under the restrictions imposed by the U.S. Federal Communications Commission (FCC) spectral masks. Exploiting Inverse Fourier Transform (IFT) of FCC mask, the required analog signals are extracted through robust calculation and the optimum realizable analog signal for FCC mask is constructed while the simulations confirmed the analytical approach. Normalized effective signal power (NESP) of the proposed method is 95.27% which shows better efficiency compared to the other methods in the literature