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In this paper, we consider a cognitive radio (CR) system in non-ideal fading wireless channels and propose a cooperative spectrum sensing scheme based on coherent multiple access channel (MAC) serving as an alternative way to improve the cooperative spectrum sensing performance. We assume that the gains of the observations and transmission channels are all known which is available since we use standard...
Cognitive radio is thought to be a flexible way to improve the spectrum efficiency. The major challenge is that the communications in the cognitive radio network would be affected by the behaviors of licensed incumbents. The cognitive system must vacate the channel within moving time whenever the licensed incumbents re-occupy that channel, in order to reduce the interference to the licensed system...
To take advantage of time-varying spectrum opportunities, a cognitive radio (CR) user continuously monitors the dynamic usage of the licensed frequency band and is allowed to utilize the spectrum resource when it does not cause unacceptable interference with licensed users. In this paper, the transmit power control scheme for each data transmission between periodic spectrum sensing activities is proposed...
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