Novel Spectrum Handoff in Cognitive Radio Networks Using Fuzzy Logic
Nisar A. Lala, Moin Uddin, Nagma Sheikh · International Journal of Information Technology and Computer Science · 2013
Cognitive rad io is a technology initiated by many research organizations and academic institutions to raise the spectrum utilization of underutilized channels in order to alleviate spectrum scarcity problem to a larger extent.Spectru m handoff is in itiated due to appearance of primary user (PU) on the channels occupied by the secondary user (SU) at that time and location or interference to the PU exceeds the certain threshold.In this paper, we propose a novel spectrum handoff algorith m using fuzzy logic based approach that does two important functions: 1) adjusts transmission power of SU intelligently in order to avoid handoff by reducing harmful interference to PUs and 2) takes handoff decisions intelligently in the light of new parameter such as expected holding t ime (HT) of the channel as one of its antecedent.Simu lated results show impact analysis of selection of the channel in the light of HT information and the co mparison with random selection algorith m demonstrates that there is considerable reduction in handoff rate of SU.