tailieunhanh - Báo cáo hóa học: " Research Article Localized Mode DFT-S-OFDMA Implementation Using Frequency and Time Domain Interpolation"

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 Localized Mode DFT-S-OFDMA Implementation Using Frequency and Time Domain Interpolation | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 750534 9 pages doi 2009 750534 Research Article Localized Mode DFT-S-OFDMA Implementation Using Frequency and Time Domain Interpolation Ari Viholainen 1 Tero Ihalainen 1 Mika Rinne 2 and Markku Renfors EURASIP Member 1 1 Department of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland 2Nokia Research Center . Box 407 00045 Helsinki Finland Correspondence should be addressed to Ari Viholainen Received 3 September 2008 Revised 19 December 2008 Accepted 12 March 2009 Recommended by Ana Perez-Neira This paper presents a novel method to generate a localized mode single-carrier frequency division multiple access SC-FDMA waveform. Instead of using DFT-spread OFDMA DFT-S-OFDMA processing the new structure called SCiFI-FDMA relies on frequency and time domain interpolation followed by a user-specific frequency shift. SCiFI-FDMA can provide signal waveforms that are compatible to DFT-S-OFDMA. In addition it provides any resolution of user bandwidth allocation for the uplink multiple access with comparable computational complexity because the DFT is avoided. Therefore SCiFI-FDMA allows a flexible choice of parameters appreciated in broadband mobile communications in the future. Copyright 2009 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 OFDMA is a multiple access technique that inherits many attractive features of the orthogonal frequency division multiplexing OFDM transmission 1 2 . However as a multicarrier signal waveform it suffers from a high peak-to-average power ratio PAPR and hence leads to power inefficiency which has serious consequences for an uplink transmission 3 . Recently .