Abstract

Abstract — A cognitive radio must detect the presence of primary users to avoid interfering with them. However, it has been assumed that many devices in primary networks such as televisions and cellular phones are passive, i.e. the cognitive radio cannot find their locations. In this paper we show how we can take advantage of the Local Oscillator (LO) leakage power that all RF receivers emit to allow cognitive radios to locate these receivers. We show that our detection approach can detect the LO leakage with very high probability and takes on the order of milliseconds to make a decision. We then propose a new architecture consisting of sensor node detector devices that detect the LO leakage and communicate the channel usage to the cognitive radios. We also compare the performance of our proposed solution to that of architectures assuming passive primary receivers. Keywords-cognitive radio;software defined radio;sensor networks;local oscillator leakage I.

Citations

91	Cognitive radio: Making software radios more personal - Mitola, Maguire - 1999
65	Some fundamental limits on cognitive radio - Sahai, Hoven, et al.
20	White paper: CORVUS: A Cognitive Radio Approach for Usage of Virtual Unlicensed Spectrum - Broderson, Wolisz, et al.