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: On the capacity of Rayleigh-fading correlated spectrum sharing networks | Makki and Eriksson EURASIP Journal on Wireless Communications and Networking 2011 2011 83 EURASIP Journal on . http content 20ii i 83 Wireless Communications and Networking a Springeropen Journal RESEARCH Open Access On the capacity of Rayleigh-fading correlated spectrum sharing networks Behrooz Makki and Thomas Eriksson Abstract Recently substantial attention has been paid to improve the spectral efficiency of communication setups using different spectrum sharing techniques. This paper aims to study the capacity of Rayleigh-fading spectrum sharing channels in the case where there is correlation between the fading channels. Assuming perfect channel state information the channel capacity is obtained under both adaptive and nonadaptive unlicensed user power allocation capabilities and the licensed user outage probability and received interference power constraints. Theoretical and simulation results show that 1 there is considerable potential for data transmission of unlicensed users with limited degradation of the licensed users data transmission efficiency 2 while the effect of fading channels dependencies is ignorable at low correlation values the channel capacity is significantly affected as the channels correlation increases and 3 depending on the fading distributions the unlicensed user channel capacity is not essentially a decreasing function of the licensed user transmission power in the licensed user outage-limited scenario. 1 Introduction Spectrum sharing networks are initiated by the apparent lack of spectrum under the current spectrum management policies. Currently most of frequency bands useful to wireless communication are under control of primary license holders that have exclusive right to transmit over their spectral bands. This is the point that has created the perception of spectrum shortage leading to evergrowing complaints about available spectral resources. On the other hand recent studies . 1 2 show that at any given
