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Cognitive radio (CR) technology is a new communication paradigm that can be a solution to the spectrum scarcity problem. The new spectrum usage pattern necessitates corresponding routing protocols to exploit the available spectrum opportunistically. In this paper, we propose a novel Spectrum-Aware Routing Protocol (SARP) for multi-hop cognitive radio ad hoc networks. SARP integrates channel choice...
Cooperative spectrum sensing can improve the detection reliability in cognitive radio network. How to report the local sensing results to the fusion center has not aroused much interest. Since OFDM has been widely recognized as a promising candidate for cognitive radio in opportunistic spectrum access scenarios, a OFDMA-based sensing reporting scheme is designed. Correspondingly, several fusion rules...
The users in a cognitive radio system should employ an efficient power allocation algorithm to share the spectrum with the primary user and avoid interference to them. This paper proposes a power allocation algorithm for distributed cognitive radio systems, which can guarantee transmitting opportunities for more cognitive users while not impairing the QoS of primary users. The simulation results show...
In this paper, the problem of joint subchannels and power allocation for a OFDM based downlink cognitive radio system is studied. The joint allocation problem is formulated as an optimization problem under multiple constraints. Different from recent researches, we consider a more practical scenario and choose the outage probability as the constraint guaranteeing QoS of primary users. Then the constraint...
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