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

Abstract

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.)