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A Real Time Cognitive Radio Testbed for Physical and Network level Experiments

Cognitive Radios have been advanced as a technology for the opportunistic use of under-utilized spectrum. However, Primary users of the spectrum have raised concerns with regards to interference from Cognitive Radios. On the other hand, a variety of techniques have been proposed for reliable sensing and non-interfering use of the spectrum which have yet to be validated in an actual system. In this paper we present a testbed that will allow us to experiment with sensing algorithms and to demonstrate a working prototype of an indoor cognitive radio network. The testbed is based on the BEE2, a multi-FPGA emulation engine which is capable of connecting to 18 radio front-ends. The testbed will be used to experiment with various baseband sensing algorithms and cooperative sensing schemes.