  Radio Spectrum is most precious and scarce resource and must be utilized
efficiently and effectively. Cognitive radio is the promising solutions for the
optimum utilization of the scared natural resource. The spectrum owned by the
primary user should be shared among the secondary user, but primary user should
not be interfered by the secondary user. In order to utilize the primary user
spectrum, secondary user must detect accurately, the existence of primary in
the band of interest. In cooperative spectrum sensing, the channel between the
secondary users and the cognitive radio base station is non stationary and
causes interference in the decision in decision fusion and in information in
information due to multipath fading. In this paper neural network based
cooperative spectrum sensing method is proposed, the performance of proposed
method is evaluated and observed that, the neural network based scheme
performance improve significantly over the AND,OR and Majority rule
