POMDP Based Dynamic Spectrum Access Algorithm in Cognitive Radio
Yutao Liu · Science Technology and Engineering · 2009
A POMDP(Partially Observable Markov Decision Process) based DSA(Dynamic Spectrum Access) algorithm is suggested under hardware constrains,after study the faults of two kinds of DSA algorithm:cooperation style and non-cooperation style.The algorithm uses the senses to get the estimate of spectrum environment then use the result to decide access action.Tthe POMDP optimal solution and greedy method are used to solve the model,it can get about 25% more bandwidth opportunities than random sense-access policy;the greedy method solution is a suboptimal one,but it gets similar performance with the optimal solution when the number of horizons is small.