| dc.description.abstract | In cognitive radio networks (CRNs), channel hopping communications are widely used to improve the utilization of licensed spectrum and solve unlicensed spectrum shortage problem. Besides, since the price of wireless transceivers becomes lower, devices in CRNs can be equipped with more radios to reduce the time to rendezvous (TTR). However, if SUs are equipped with many radios, all signals add together which brings a risk of destructive interference. It implies the devices should spend more computational resource and power to reduce interference. We consider that the devices in CRNs may be low power and low computing capability. Hence, the users (SUs) in CRNs are proper to be equipped with two radios. However, some existing multi-radios channel hopping schemes for CRNs, which have obvious patterns (i.e., a user utilizes a fixed channel for a long while), are vulnerable to jamming attacks in CRNs. Many existing anti-jamming channel hopping scheme in CRNs rely on pre-shared information (e.g., pre-shared channel hopping sequences) to build communication link between senders and receivers. However, pre-shared information among communication pairs is impractical in CRNs. Hence, anti-jamming channel hopping schemes without pre-sharing information have gained more research interests.
In this paper, we propose an anti-jamming channel hopping scheme with two radios, DR-CH, and it has bounded time to rendezvous. | en_US |