GPS-enabled collaborative sensing in cognitive radio networks for efficient spectrum assignment
Kanduri Annapurna, B. Seetha Ramanjaneyulu · 2016
Accurate sensing of the spectrum is one of the prime requirements for efficient functioning of cognitive Radio systems. But accurate sensing is a complex process, as signals of different modulations, coding methods and power levels along with fading and noise are present in the given radio environment. Collaborative sensing techniques can help to improve the sensing accuracy. One such collaborative sensing mechanism is proposed in this work where several cognitive radios having GPS capability contribute to the database of `spectrum occupancy', corresponding to the sensing information at various Geographic locations. The secondary users that want to avail the spectrum obtain this information from the server and analyze the environment by combining this information with the locally sensed information. This method can help to implement efficient spectrum assignment strategies to cognitive radios. A scenario where such information from the database is used to optimize the bandwidth utilization at a given geographical location, is explored in this work. The simulation results of the system show that the proposed mechanism can help to improve the throughput of secondary network.