Spectrum occupancy in realistic scenarios and duty cycle model for cognitive radio

摘要: Most of the spectrum occupancy measurement campaigns performed to date in context cognitive radio are based on measurements outdoor high points such as building roofs, balconies and towers. Although these measurement scenarios enable a more accurate estimation primary transmitters’ spectral activity, they may not be representative of perceived by radio user in many other interesting practical situations where users are not placed static point. In this context, work presents the results obtained campaign performed over rich diversity scenarios of practical interest. The considered include only high points but also indoor environments well locations at ground level open areas between buildings. The variety provides broader view understanding dynamic under different impact considering various locations activity cognitive radio user is determined, analyzed quantified. Moreover, a theoretical model for levels observed at different locations developed verified with results.