tailieunhanh - Báo cáo hóa học: " A Multicarrier Multiplexing Method for Very Wide Bandwidth Transmission"

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: A Multicarrier Multiplexing Method for Very Wide Bandwidth Transmission | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 64253 Pages 1-11 DOI WCN 2006 64253 A Multicarrier Multiplexing Method for Very Wide Bandwidth Transmission Diakoumis Gerakoulis1 and George Efthymoglou2 1 General Dynamics Advanced Information Systems Bloomington MN 55431 USA 2 Department of Technology Education and Digital Systems University of Piraeus Piraeus 18534 Greece Received 28 February 2005 Revised 17 January 2006 Accepted 19 January 2006 Recommended for Publication by Lee Swindlehurst The multicarrier orthogonal code division multiplexing MC-OCDM introduced here has been designed for very wide bandwidth VWB point-to-point and point-to-multipoint transmission. In order to meet VWB transmission requirements the MC-OCDM design has two components the basic and the composite. The basic MC-OCDM is a generalized form of the standard orthogonal frequency division multiplexing OFDM . It has the property of distributing the power of each transmitted symbol into all subcarrier frequencies. Each subcarrier will then carry all transmitted symbols which are distinguished by orthogonal Hadamard sequences. The resulting system is shown to improve the performance of OFDM by introducing frequency and time diversity. As shown by both analysis and simulation the basic MC-OCDM combats the effects of narrowband interference NBI . In particular the simulation results show that the BER performance of the basic MC-OCDM in the presence of NBI is better than OFDM for both coded and uncoded systems. Furthermore the composite MC-OCDM is a method of orthogonal frequency division multiplexing OFDM basic MC-OCDM channels. This allows us to multiplex more than one basic MC-OCDM channel into a VWB transmission system which can have the performance and spectral efficiency required in fixed wireless transmission environments. Copyright 2006 D. Gerakoulis and G. Efthymoglou. This is an open access article distributed under