tailieunhanh - Báo cáo hóa học: " Efficient Implementation of Complex Modulated Filter Banks Using Cosine and Sine Modulated Filter Banks"

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: Efficient Implementation of Complex Modulated Filter Banks Using Cosine and Sine Modulated Filter Banks | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 58564 Pages 1-10 DOI ASP 2006 58564 Efficient Implementation of Complex Modulated Filter Banks Using Cosine and Sine Modulated Filter Banks Ari Viholainen Juuso Alhava and Markku Renfors Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Received 12 April 2005 Revised 6 October 2005 Accepted 17 October 2005 Recommended for Publication by Ulrich Heute The recently introduced exponentially modulated filter bank EMFB is a 2M-channel uniform orthogonal critically sampled and frequency-selective complex modulated filter bank that satisfies the perfect reconstruction PR property if the prototype filter of an M-channel PR cosine modulated filter bank CMFB is used. The purpose of this paper is to present various implementation structures for the EMFBs in a unified framework. The key idea is to use cosine and sine modulated filter banks as building blocks and therefore polyphase lattice and extended lapped transform ELT type of implementation solutions are studied. The ELT-based EMFBs are observed to be very competitive with the existing modified discrete Fourier transform filter banks MDFT-FBs when comparing the number of multiplications additions and the structural simplicity. In addition EMFB provides an alternative channel stacking arrangement that could be more natural in certain subband processing applications and data transmission systems. Copyright 2006 Ari Viholainen 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. 1. INTRODUCTION In many practical applications the signals under consideration are real-valued. However in communications signal processing complex-valued in-phase quadrature I Q signals are commonly used. I Q signals are .