A Maximum Likelihood Combined Cognitive Radio Analysis for Amplitude-Locked Loop

The transmission system of wireless communication is induced the channel noise. The potential sources of any noise type, which make and diturb the transmission system in external or internal to the communication system for message delivering. The carrier signal mixed interference signal using the amplitude-locked loop (ALL) can be adopted to separat the co-channel system by operating at same frequency for the demodulation system. The co-channel interference (CCI) is the major impact quality factor of communication system. In this paper, we develop the ALL system for additive white Gaussian noise (AWGN) wireless environment. In the ALL demodulation system, it is included the detection method by signal spectrum using cognitive radio (CR) system. The maximum likelihood estimation (MLE) algorithm is also estimated for probability density distribution statistical parameters. The result is shown the mean-square error (MSE) for different carrier signal-to-noise (SNRc) for dominant and subdominant signals.