Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Performance analysis of fixed-gain AF dual-hop relaying systems over Nakagami-m fading channels in the presence of interference | AI-Qahtani et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 190 EURASIP Journal on . http content 2011 1 190 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Performance analysis of fixed-gain AF dual-hop relaying systems over Nakagami-m fading channels in the presence of interference Fawaz S AI-Qahtani 1 Caijun Zhong2 Khalid A Qaraqe1 Hussein Alnuweiri1 and Tharm Ratnarajah3 Abstract This article presents an analytical investigation on the performance of interference-limited fixed-gain amplify-and-forward dual-hop relaying systems over Nakagami-m fading channels. Assuming the fading parameter m of the two hop channels being integer we derive a closed-form expression of the cumulative distribution function of a new type of random variables involving a number of independent gamma random variables based on which the outage performance and symbol error rate of the system are examined and two important performance metrics at the high signal-to-noise ratio regime namely diversity order and coding gain are characterized. Moreover expressions of the general moments of the end-to-end signal-to-interference-and-noise ratio are derived and then applied in the analysis of the ergodic capacity of the system. In addition the impact of interference power distribution on the ergodic capacity of the system is studied with the aid of a majorization result. Our findings suggest that the diversity of the system is limited by the hop experiencing severer fading and co-channel interferences do not reduce the diversity order of the system instead they degrade the outage performance by affecting the coding gain of the system. Keywords amplify-and-forward relaying co-channel interference cooperative communications Nakagami-m fading performance analysis 1 Introduction Dual-hop relaying transmission as a means to improve the throughput and extend the coverage of the wireless communication system has .
