Distributed spectrum sensing and access in cognitive radio networks with energy constraint
IEEE Transactions on Signal Processing
Adaptive spectrum assessment for opportunistic access in cognitive radio networks
IEEE Transactions on Wireless Communications
Primary-prioritized Markov approach for dynamic spectrum allocation
IEEE Transactions on Wireless Communications
Opportunistic spectrum access for energy-constrained cognitive radios
IEEE Transactions on Wireless Communications
Cognitive Radio: A Communications Engineering View
IEEE Wireless Communications
Sensing-Throughput Tradeoff for Cognitive Radio Networks
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
How much spectrum sharing is optimal in cognitive radio networks?
IEEE Transactions on Wireless Communications
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
A simple Cooperative diversity method based on network path selection
IEEE Journal on Selected Areas in Communications
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We consider a cognitive radio network where many secondary users compete with each other for a primary spectrum. The design objective is to determine, in each frame, which secondary user (SU) transmits data when primary user (PU) is idle. We propose a sensing and access scheme which is adopted in a fully distributed manner. First we assume that there is no sensing error and compare the average throughput of the proposed scheme with that of optimum. The performance of the proposed scheme if there is no sensing error has a feature similar to optimal case. And the performance is improved in a large network with much more secondary users. Next we analyze the performance of the proposed scheme if there is sensing error. Under imperfect sensing, the average throughput of the proposed scheme shows a different feature. The numerical examples show that there exists the optimal number of SUs and sensing duration to maximize the average throughput for a given target detection probability.