Spectrum access strategy for cognitive wireless networks sensing part of channels

To effectively balance contradiction between sensing time of access channel and total throughput of channel in secondary user system of cognitive wireless network, a kind of spectrum access strategy sensing part of channels is proposed. The Thesis, based on algorithm proposed through single secondary user carrying out transmission on multiple channels of master user at the same time, takes total throughout of channel as objective function; on one hand, it is related to transmission rate, on the other hand, it is related to selection of sensing time and sensing channel. The algorithm assumes secondary user detects channel through perception in order and chooses certain suitable channel by using optimum stopping theory to perceive. It avoids sensing all channels, meanwhile, the throughput is greater. Through comparison with simulation analysis of HC-MAC (Hardware-constrained Cognitive MAC) algorithm, the algorithm avoids sensing all channels and lowers expenditure, meanwhile, the throughput is greater, which make it obtain obvious advantage on performance.