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 Maximising the System Spectral | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2008 Article ID 867959 13 pages doi 2008 867959 Research Article Maximising the System Spectral Efficiency in a Decentralised 2-Link Wireless Network Sinan Sinanovic 1 Nikola Serafimovski 2 Harald Haas 1 and Gunther Auer3 1 Institute for Digital Communications School of Engineering and Electronics The University of Edinburgh Edinburgh EH9 3JL UK 2 School of Engineering and Science Jacobs University Bremen 28759 Bremen Germany 3 DoCoMo Euro-Labs 80687 Munchen Germany Correspondence should be addressed to Sinan Sinanovic Received 1 June 2007 Revised 19 November 2007 Accepted 13 February 2008 Recommended by Ivan Cosovic This paper analyses the system spectral efficiency of a 2-link wireless network. The analysis reveals that there exist three operating points that possibly maximise the system spectral efficiency either both links transmit with maximum power simultaneously or one single link transmits with maximum power while the other is silent. The impact of the chosen multiple access scheme on the system spectral efficiency is also studied simultaneous transmission or sequential access where the two links share the medium by dedicated time frequency slots without causing interference. An exhaustive numerical search over a wide range of channel realisations quantifies the gains in system spectral efficiency when choosing either the optimal single simultaneous or sequential medium access. Furthermore issues regarding the power efficiency are addressed. Finally the restriction to a 2-link network is relaxed by introducing background interferers reflecting a multiple link scenario with one dominant interferer. Simulation results indicate that increasing background interference reduces the advantage of sequential over simultaneous transmission. Copyright 2008 Sinan Sinanovic et al. This is an open access article distributed under the .
