Cooperative Spectrum Sensing with energy-efficient Sequential Decision Fusion rule

Energy efficiency is an important issue in Cooperative Spectrum Sensing (CSS). In this paper, an energy-efficient Sequential Decision Fusion (SDF) scheme based on K-out-of-N rule is proposed. By fusing the received decisions sequentially, Fusion Center (FC) may achieve a global decision before receiving all individual decisions. We verify that the performance of CSS using the proposed scheme is completely equal to the conventional CSS where FC adopts all decisions. Average number of decisions required at FC is also investigated. Numerical results show that SDF reduces the average number of decisions required dramatically without any loss in sensing performance.