Continuous transmit in cognitive radio systems: outage performance of selection decode-and-forward relay networks over Nakagami- m fading channels
EURASIP Journal on Wireless Communications and Networking(2015)
摘要
Cognitive radio is a promising technology that uses radio spectrum opportunistically and efficiently. In this paper, we present the performance of ‘Always transmit’ strategy, which consists of allowing the cognitive source to transmit over all time slots and in any time slot. Thus, the cognitive source will be able to operate continuously whenever either the primary user is active or absent. The proposed strategy is projected into dual-hop communication systems with decode-and-forward and relay selection over independent but not necessarily identically distributed Nakagami- m fading channels. We derive the closed-form expressions of the outage probability, and we analyze the performance. Simulation results show that the strategy ‘Always transmit + Relay’ outperforms other conventional cognitive radio strategies and the use of relays enhances the performance in deep fading channel.
更多查看译文
关键词
Continuous transmit in cognitive radio,Decode-and-forward relay,Spectrum sensing,Interference constraints,Interweave approach,Underlay approach,Nakagami-m fading,Outage probability
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络