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In multichannel system, user could keep transmitting over an instantaneous “on peak” channel by opportunistically accessing and switching among channels. Previous studies rely on constant transmission duration, which would fail to leverage more opportunities in time and frequency domain. In this paper, we consider opportunistic channel accessing/releasing scheme in multichannel...
A critical challenge in Cognitive Radio Networks (CRN) is to make decision in real-time on accessing and releasing available channels that maximize the spectrum utilization and the overall system throughput. In this work, we make investigations on optimal action point to explore and exploit the frequency-temporal diversity in addition to spectrum availability. By modeling the Rayleigh fading channel...
This article considers the issue of dynamic spectrum access in time domain, in which the secondary user seeks spectrum vacancy between bursty transmissions of the primary user to communicate. Since spectrum sensing and data transmission can not be done simultaneously in the same band, the secondary user should employ the sense-then-transmit strategy to detect the presence of primary user before accessing...
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