tailieunhanh - Báo cáo hóa học: " Research Article Nyquist Filters with Alternative Balance between Time- and Frequency-Domain Parameters"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Nyquist Filters with Alternative Balance between Time- and Frequency-Domain Parameters | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 903980 11 pages doi 2010 903980 Research Article Nyquist Filters with Alternative Balance between Time- and Frequency-Domain Parameters Marek Bobula 1 Ales Prokes 1 and Karel Danek2 1 Department of Radio Electronics Brno University of Technology Purkynova 118 612 00 Brno Czech Republic 2Research and Development Department Racom Ltd. Mirova 1283 592 31 Nove Mesto na Morave Czech Republic Correspondence should be addressed to Marek Bobula xbobul00@ Received 20 March 2010 Revised 14 September 2010 Accepted 28 October 2010 Academic Editor George Tombras Copyright 2010 Marek Bobula et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Designing matched pulse shaping filters with their cascade satisfying the Nyquist condition for minimum intersymbol interference constitutes an important task for almost all digital data radio transceivers processing an incoming data signal on the sample-by-sample basis. Despite their practical importance there are only few sets of Nyquist filter definitions and design techniques to devise digital filter coefficients available for a designer. In this paper we propose a set of Nyquist filters that balance the time- and frequency-domain parameters in favor of a filter stop-band attenuation and residual intersymbol interference compared with the already existing Nyquist filter sets. Using a number of filter examples this paper shows that the proposed Nyquist filters can be a good option for applications that need to fulfill strict limits of adjacent and alternate channel power attenuation while providing a low level of residual intersymbol interference and group delay of the digital filter. 1. Introduction If the digital receiver processes a data signal .