Power allocation strategy for Cognitive Radio terminals

Traditional communications systems imply an a priori association of the frequency band, the service assigned to it and the used technology. Breaking this static association can provide much more flexible, efficient and easy-to-use dynamic systems able to cope with the requirements and constraints of the environment and the users. Cognitive radio and software defined radio modify this current communication paradigm. They provide the enabling technologies to perceive, learn, reason and interact accordingly in open-ended changing environments for the coexistence of different services and systems technologies on the same radio bands. They benefit from the recent advances in digital signal processing, fast computing and advanced reception techniques. This paper evaluates the performances of a cognitive radio approach to the coexistence problem for two application scenarios: a meshed OFDM-based secondary wireless service in coexistence with a primary terrestrial and satellite DVB-SH system.