Adaptive CRN spectrum sensing scheme with excellence in topology and scan scheduling

Abstract

Spectrum sensing has been identified as one of the greatly important functionalities, which avoids interference to primary users, by reliably detecting primary user signals in Cognitive Radio /Opportunistic Spectrum Access Networks. In this paper, an adaptive cooperative spectrum sensing scheme with a dual-topology configuration and feasible function framework is proposed for optimal sensing adaptability and practice feasibility. The centralized MAC Sensing Network aims at an efficient optimized parameter feedback while the coequal intercommunion PHY Sensing Network would get secure and facile spectrum sensing capability. The simplified function architecture of the network organized spectrum sensing model is given out. Based on the holistic assumption, a parallel processing channelized cooperation scheme is introduced and an agile holistic scanning strategy which could provide a list of idle holes at any moment is discussed. To reduce the system overhead, certain numbers sub-bands are considered as the periodically scanning target for locating the idle hole when the initial sensing stage is over. Two kinds of agile holistic scanning Scheme are considered to solve the proactive and reactive scanning problem. The simulation result indicates that the presented method performs well in improving the sensing efficiency and stability.