tailieunhanh - Báo cáo hóa học: " Paraunitary Oversampled Filter Bank Design for Channel Coding"

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: Paraunitary Oversampled Filter Bank Design for Channel Coding | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 31346 Pages 1-10 DOI ASP 2006 31346 Paraunitary Oversampled Filter Bank Design for Channel Coding Stephan Weiss 1 Soydan Redif 1 Tom Cooper 2 Chunguang Liu 1 Paul D. Baxter 2 and John G. McWhirter2 1 Communications Research Group School of Electronics and Computer Science University of Southampton Southampton SO171BJ UK 2 Advanced Signal and Information Processing Group QinetiQ Ltd Malvern Worcestershire WR14 3PS UK Received 20 September 2004 Revised 25 July 2005 Accepted 26 July 2005 Oversampled filter banks OSFBs have been considered for channel coding since their redundancy can be utilised to permit the detection and correction of channel errors. In this paper we propose an OSFB-based channel coder for a correlated additive Gaussian noise channel of which the noise covariance matrix is assumed to be known. Based on a suitable factorisation of this matrix we develop a design for the decoder s synthesis filter bank in order to minimise the noise power in the decoded signal subject to admitting perfect reconstruction through paraunitarity of the filter bank. We demonstrate that this approach can lead to a significant reduction of the noise interference by exploiting both the correlation of the channel and the redundancy of the filter banks. Simulation results providing some insight into these mechanisms are provided. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION The redundancy and design freedom afforded by oversampled filter banks OSFBs has in the past been exploited for robustness towards quantisation of subband signals 1-3 reconstruction of erased or erroneously received subband samples 4 5 or for the design of error correction coders 6 7 . More recently in 8 a systematic parallelism between block codes and oversampled filter bank systems for channel coding has been drawn whereby the system design is based on .