CORAL: A WiFi based cognitive radio development platform

CORAL is a WiFi based wireless terminal building block that can be used to implement cognitive radio networks (CRN). Its cognitive capabilities are created by providing a PHY and MAC control framework around a standard off-the-shelf WiFi router containing multiple radios. In doing this we implement a CRN that has sensing capabilities and is able to control radio emissions in space, time, and by channel in a manner that facilitates interference mitigation and control. Cognitive algorithms within CORAL can support learning, giving the CRN adaptive capabilities such as dynamic spectrum assessment and autonomous channel selection. The modular nature of CORAL allows implementation of radio topologies such as relay and mesh networks, as well as multipoint distribution networks. This simple but highly flexible radio system can implement many features identified by the ITU as important to Cognitive Radio and is intended to give researchers a viable platform on which to implement cognitive radio in an operational environment.