Implementation of FSK and PSK Using On-Off Keying with MATLAB

Frequency shift keying (FSK) and Phase shift keying (PSK) are executed and investigated in this paper. FSK and PSK modulated signals are produced using On-Off Keying (OOK) which is a special case of Amplitude Shift Keying (ASK).This paper describes the relation between digital modulation technique ASK, FSK and PSK in the simplest manner.These are digital modulation techniques so the input signal should be in binary form means either 0 or 1. For ASK amplitude of carrier signal is varied to represent binary 1 and 0 respectively, FSK frequency of carrier signal is varied according to the message signal and for PSK phase of the carrier signal is varied according to the message signal. In this paper square wave as message signal data and a high frequency carrier signal have been used. First ASK signal is executed by simple multiplication process of data stream with carrier and then FSK through invert data stream with changing frequency of the carrier also. PSK is implemented by change data stream in bi-polar NRZ (Non return to Zero) form and then multiplication process. To execute the coding system generator version 8.5 are used under MATLAB version (R2015a.