Implementation / simulation of a universal modulation identifier and de modulator for communication intelligent (Commint) system

Abstract

We, in our project, has developed and implemented a new algorithm for modulation identification in ideal channel conditions. This algorithm may be classified in the statistical method category. It has been totally our thinking and work that has led us to develop such an algorithm that is based truly on the modulating parameters. Hence, it could be said that any modulation technique can be identified as long as the modulating parameters can be extracted from the received signal. Our algorithm ha been termed as ’Histogram-Count Modulation Identification’ (HCMI) method. In the algorithm, we have derived the modulating parameters as the identification parameters. First we plot the histograms of the respective modulating parameters, which give us the number of these parameters. Basing upon which, we identify the modulation technique. The implementation of the project has been divided into three stages. These stages are mentioned as follows: - 1. Implementation of the Digital Modulators. 2. Implementation of Digital Modulation Identifier. 3. Implementation of Digital Demodulators. Our project is Matlab based. Basically the algorithm has been simulated in Matlab. The version used as the platform is Matlab 7. Our secondary goal is the implementation of the project on a DSP TMS320C6000. But the secondary goal is in view to the time line available for the project. Certainly due to non-availability of the card and the time we have not been able to achieve our secondary goal but we do not regret our achievement.