tailieunhanh - Báo cáo hóa học: " Research Article Cognitive Cooperation for the Downlink of Frequency Reuse Small Cells"

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 Cognitive Cooperation for the Downlink of Frequency Reuse Small Cells | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 525271 11 pages doi 2011 525271 Research Article Cognitive Cooperation for the Downlink of Frequency Reuse Small Cells Salam Akoum 1 Marie Zwingelstein-Colin 2 Robert W. Heath Jr. 1 and Merouane Debbah3 1 Wireless Networking and Communications Group Department of Electrical and Computer Engineering The University of Texas at Austin 1 University Station C0803 Austin TX 78712-0240 USA 2IEMN DOAE UMR8520 University Lille Nord de France 59000 Lille France 3Ecole Superieure d Electrecite SUPELEC Alcatel-Lucent Chair on Flexible Radios 3 rue Joliot-Curie 91192 Gifsur Yvette Cedex France Correspondence should be addressed to Marie Zwingelstein-Colin Received 1 June 2010 Revised 28 September 2010 Accepted 16 November 2010 Academic Editor Robert Schober Copyright 2011 Salam Akoum 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. We develop a cooperative diversity protocol coded over space time and frequency to achieve improved quality of service for mobile users in the downlink of small-cell frequency reuse networks. The proposed protocol called cooperative frequency reuse CFR leverages the cellular frequency reuse concept to create space and frequency diversity among pairs of adjacent base stations. The CFR protocol is compatible with the half-duplex mode and is distributed in the sense that each base station acts in autonomy without the need of a centralized entity. It is implemented in two phases. During the first phase each base station independently serves its own users on its dedicated frequency band. It simultaneously listens to the symbols transmitted by neighboring base stations. Cognitive cooperation is introduced in the second phase where each