. As As a first step, I simulated the performances of various digital modulation schemes like Binary Phase Shift Keying, Quadrature Phase Shift Keying, Differential Phase Shift Keying in AWGN channel and compared the same in a Rayleigh fading channel. My next step was to simulate the results of ergodic chaotic on-off keying.As a part of the same work, I simulated the results of the papers on Quadrature Chaos shift keying and Differential Chaos Shift Keying. Presently, I have completed my work on 'Digital communication in ergodic Quadratic chaos shift keying' and have submitted the paper to the IEEE transactions on consumer electronics.