Location Based Spectrum Sensing For Rayleigh Fading

Spectrum sensing is one of the main research issues under wireless communication for dynamic spectrum sharing .there are many spectrum sensing algorithm proposed in literature each of them has its own advantages and disadvantages. Among the algorithms emery detector based spectrum sensing is less complex and adapted in wireless standard. The issues in the energy detector is the poor performance in fading environment and correct threshold selection for the given environment. Here in this paper a location based threshold selection in the Rayleigh fading environment is used for the analysis and the probability of detection, probability of false alarms are calculated for the performance evolution. Here a cooperative spectrum sensing is carried out by taking various like indoor environment and relay network of the case amplify and forward .the energy of received signal is usually function of distant from the transmitter, so under location based threshold selection more threshold value is used if the sensing node is near to primary transmitter or less value is used if it is far away from the transmitter .under this work it is assumed that all the node in the network is assumed that they are all known the location of them and the primary user