Journal of Communications
Spectrum sensing is a key enabling functionality in a Cognitive Radio (CR) network. The fusion problem of cooperative spectrum sensing, for a cognitive radio network equipped with multi-antennas at its base-station, is considered in this paper. The base-station equipped with multi-antennas act as a fusion center which can attain not only the soft information (average power) by its multi-antennas but also the soft or hard information from other Cognitive Radio users (CR users). The authors first discuss the soft fusion scheme in which soft information from CR users is sent to the base-station, and exhibit the necessity of deeper cooperation.