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 Bit Rate Maximising Per-Tone Equalisation with Adaptive Implementation for DMT-Based Systems | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 380560 13 pages doi 2009 380560 Research Article Bit Rate Maximising Per-Tone Equalisation with Adaptive Implementation for DMT-Based Systems Suchada Sitjongsataporn and Peerapol Yuvapoositanon Centre of Electronic Systems Design and Signal Processing CESdSP Department of Electronic Engineering Mahanakorn University of Technology 140 Cheumsamphan Road Nong-chok Bangkok 10530 Thailand Correspondence should be addressed to Suchada Sitjongsataporn ssuchada@ Received 3 December 2008 Revised 9 July 2009 Accepted 19 September 2009 Recommended by Azzedine Zerguine We present a bit rate maximising per-tone equalisation BM-PTEQ cost function that is based on an exact subchannel SNR as a function of per-tone equaliser in discrete multitone DMT systems. We then introduce the proposed BM-PTEQ criterion whose derivation for solution is shown to inherit from the methodology of the existing bit rate maximising time-domain equalisation BM-TEQ . By solving a nonlinear BM-PTEQ cost function an adaptive BM-PTEQ approach based on a recursive Levenberg-Marquardt RLM algorithm is presented with the adaptive inverse square-root iQR algorithm for DMT-based systems. Simulation results confirm that the performance of the proposed adaptive iQR RLM-based BM-PTEQ converges close to the performance of the proposed BM-PTEQ. Moreover the performance of both these proposed BM-PTEQ algorithms is improved as compared with the BM-TEQ. Copyright 2009 S. Sitjongsataporn and P. Yuvapoositanon. 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 Discrete multitone DMT is a digital implementation technique widely used for high speed wired multicarrier transmission such as asymmetric digital subscriber lines ADSLs 1
