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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING  CONCEPT:

       Using cognitive radios (CRs), the secondary users (SUs) are allowed to use the spectrum originally allocated to primary users (PUs) as long as the primary users are not using it temporarily.

       To avoid interference to the primary users, the SUs have to perform spectrum sensing before their attempts to transmit over the spectrum. Upon detecting that the PU is idle, the SUs can make use of the spectrum for transmission, and the overall utilization efficiency of the spectrum is enhanced.

PROPOSED CONCEPT:

     We investigate a Locally Optimum (LO) detection of random signals under a weakly correlated noise model over fading channels.

        Therefore, we try to come up with an LO detection technique with comparable complexity to energy detection for correlated noise environments. The performance of LO detection is measured using false alarm and detection probabilities.

EXISTING TECHNIQUE :

      Covariance based detector, Matched filter based detector with PSK.

PROPOSED TECHNIQUE:

       Locally Optimum (LO) detection

TECHNIQUE DEFINITION:

      The matched filter is the optimal linear filter for maximizing the signal to noise ratio (SNR) in the presence of additive stochastic noise

TECHNIQUE DEFINITION:

       LO detection is measured using false alarm and detection probabilities. In fading channel, these two probabilities depend on the channel gain

DRAWBACKS:

         Spectrum utilization is not efficient.

        Noise is high.

ADVANTAGES:

         Spectrum utilization is high.

    Noise is low compare to the existing system.