ASK PSK and FSK Signal Transmission through AWGN Channel

Abstract

In this paper basic digital modulation techniques amplitude shift keying (ASK), phase shift keying (PSK) and frequency shift keying (FSK) modulation and demodulation are achieved using MATLAB. As name implies digital modulation techniques, transmitted signal should be in digital configuration. Unipolar data bit stream [1 1 0 0 1] as digital input signal for ASK and FSK, and bipolar data bit stream [1 1 0 0 1] as input signal for execution of PSK are used. The characteristics of carrier wave are modified on the basis of modulating or transmitting signal. For instance in ASK amplitude of the carrier wave is changed according to the message signal, and in PSK phase of the carrier wave is changed with message, similarly in FSK frequency of carrier is varied with message signal.