Optimal Cooperative Spectrum Sensing in Cognitive Radio with Taguchi Method
Spectrum sensing is an essential topic in cognitive radio networks to detect primary users. Cooperative spectrum sensing with linear fusion scheme is studied in multiband channel systems. The problem turns out to be a non-convex optimization problem in general with thresholds of the energy detectors and the weights of linear fusion scheme as parameters. In this paper, the authors use the Taguchi method to estimate the gradient of the aggregate throughput function, determine thresholds of the energy detector and linear combination weights of the linear fusion rule. One of the advantages of their approach is to optimize the thresholds and the linear weights simultaneously.