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Cognitive radio technology can significantly improve spectrum utilization efficiency by enabling SUs to access the licensed spectrum dynamically without causing excessive interference to PUs. Currently, most of the existing research on cognitive radio networks has been conducted based on an assumption that SUs can perfectly synchronize with PUs. However, when SUs are working with unknown behaviors...
Cognitive radio has emerged as an efficient approach to implement reuse of the licensed spectrums. How to appropriately deploy and construct the secondary network plays a rather important role. In this paper, a novel deployment scheme, which integrates the radio environment map (REM) and primary exclusive zones (PEZ) together, is proposed. We first illustrate secondary users' achievable region around...
Location distinction, as the ability of a receiver to determine whether a transmitter has changed its position, is important for many wireless applications. In order to improve the performance of location distinction in noisy environment, we propose a novel method based on ordinal pattern measure. The existing methods, such as channel gains of multi-tonal probes, received signals strength and temporal...
Many previous schemes of multi-node cooperation mimic the behavior of the multiple-antenna system, and the imitation usually causes extra overheads. In this paper, we propose a novel multi-node cooperation scheme to avoid the imitation. The basic idea is to take the wireless broadcast advantage in the whole procedure. As a result, each source could maintain a multihop diversity route to the destination...
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