Spectrum Occupancy Analysis for Cognitive Radio
Zhe Wang · 2005
Abstract: Observations provide evidence that the licensed spectrum is by far not fully used neither in time nor in space. Cognitive radio, which can sense its environment and location and then alter its frequency, modulation and other parameters so as to dynamically reuse the available spectrum, could break the current spectrum availability bottleneck. The fundamental aspect to the success of such technology is the statistical properties of the spectrum occupancy, which forms the basis of the current project. Compared with the traditional spectrum analyser a chirp sounder using digital generation can scan 250-MHz bandwidth, on the order of 4 ms repetition rate. This paper presents the basic working principle of the sounder system and some measurement results from both measurement techniques. Preliminary analysis of 2.4 GHz ISM band is presented to give some insight into the average occupancy rate, the distribution of signal levels and the availability of communication bandwidths. 1.