tailieunhanh - Báo cáo hóa học: " Cosine-Modulated Multitone for Very-High-Speed Digital Subscriber Lines"

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: Cosine-Modulated Multitone for Very-High-Speed Digital Subscriber Lines | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 19329 Pages 1-16 DOI ASP 2006 19329 Cosine-Modulated Multitone for Very-High-Speed Digital Subscriber Lines Lekun Lin and Behrouz Farhang-Boroujeny Department of Electrical and Computer Engineering University of Utah Salt Lake City UT 84112-9206 USA Received 17 November 2004 Revised 24 June 2005 Accepted 22 July 2005 In this paper the use of cosine-modulated filter banks CMFBs for multicarrier modulation in the application of very-high-speed digital subscriber lines VDSLs is studied. We refer to this modulation technique as cosine-modulated multitone CMT . CMT has the same transmitter structure as discrete wavelet multitone DWMT . However the receiver structure in CMT is different from its DWMT counterpart. DWMT uses linear combiner equalizers which typically have more than 20 taps per subcarrier. CMT on the other hand adopts a receiver structure that uses only two taps per subcarrier for equalization. This paper has the following contributions. i A modification that reduces the computational complexity of the receiver structure of CMT is proposed. ii Although traditionally CMFBs are designed to satisfy perfect-reconstruction PR property in transmultiplexing applications the presence of channel destroys the PR property of the filter bank and thus other criteria of filter design should be adopted. We propose one such method. iii Through extensive computer simulations we compare CMT with zipper discrete multitone z-DMT and filtered multitone FMT the two modulation techniques that have been included in the VDSL draft standard. Comparisons are made in terms of computational complexity transmission latency achievable bit rate and resistance to radio ingress noise. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION In recent years multicarrier modulation MCM has attracted considerable attention as a practical and viable technology .