Implementation of an Energy Detection Based Cooperative Spectrum Sensing on USRP Platforms for a Cognitive Radio Networks

摘要

The paper describes a centralized cooperative spectrum sensing system, implemented on Universal Software Radio Peripheral (USRP) hardware platforms driven by the Genuinely Not Unix (GNU) Radio software. Spectrum sensing is realized by energy detection and a new block of energy detector with uncertainty is developed using GNU Radio out-of-tree implementation. A centralized scheme for cooperative spectrum sensing is applied and a hard global decision is taken in a fusion center which collects the local decisions from secondary users, selects those of them which will be taken for global decision estimation and performs classical decision fusion logic, such as AND, OR, MAJORITY rules. Based on measured data, the probabilities of detection for different Signal-to-noise ratios (SNRs) are built for each secondary user and for different scenarios of cooperative sensing.