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 Impact of Carrier Frequency Offsets on Block-IFDMA Systems | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 483128 7 pages doi 2009 483128 Research Article Impact of Carrier Frequency Offsets on Block-IFDMA Systems E. P. Simon V. Degardin and M. Lienard Telecommunications Interferences and Electromagnetic Compatibility TELICE Institute of Electronics Microelectronics and Nanotechnology IEMN Laboratory University of Lille IEMN UMR 8520 59655 Villeneuve dAscq France Correspondence should be addressed to E. P. Simon Received 25 June 2008 Accepted 15 December 2008 Recommended by Heidi Steendam Recently a new multiple access MA scheme called block-interleaved frequency division multiple access B-IFDMA is under consideration as an MA scheme candidate for 4G wireless applications. In this paper the two variants of B-IFDMA are considered the joint- DFT B-IFDMA and the added-signal B-IFDMA and compared in terms of sensitivity to carrier frequency offsets CFOs for both uplink and downlink. CFO gives rise to multiuser interference and self-user interference. We derive analytical expressions for the power of these interferences and we quantify their detrimental effect through the evaluation of the signal-to-interference-plus-noise ratio SINR degradation. We point out that both variants of B-IFDMA are not similarly affected by CFO. Hence joint-DFT B-IFDMA provides a better robustness to multiuser interference than added-signal B-IFDMA and so is better suited for the uplink. Then we show by means of numerical results that added-signal B-IFDMA is less sensitive to CFO in the downlink. Copyright 2009 E. P. Simon 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 In the context of the research on beyond 3rd and 4th generation B3G 4G mobile radio systems a novel .
