Biologically-inspired spectrum sharing for cognitive radio
Li, Guang Fu. · DR-NTU (Nanyang Technological University) · 2010
Nowadays, spectrum access of the wireless networks is generally regulated by governments via a fixed spectrum assignment policy. However, the tremendous increase in the spectrum access of the wireless technologies challenges the limited spectrum bands. Since cognitive radio enables users to detect and transmit over the temporarily unused spectrum bands, it is seen as one of the revolutionary techniques for better spectrum utilization in the future. However, one of the most challenging tasks for cognitive radio is spectrum sharing. The biological task allocation model has been adopted to resolve the problem of spectrum sharing in cognitive radio networks. This algorithm is named BIOlogically-inspired spectrum sharing (BIOSS) in cognitive radio networks (CRN). BIOSS enables the unlicensed users to self-manage the most suitable channels for communication without any coordination among the secondary users. In this project, the performance evaluation is done by simulating the BIOSS protocol using MATLAB. Furthermore, the BIOSS algorithm is modified to achieve higher spectrum utilization. The new algorithm enables a cognitive radio to select the appropriate channels to transmit, thus optimizing the use of spectral resource. The comparison between the modified BIOSS and its original version clearly indicates that a significant improvement in performance can be achieved with the modified algorithm.