chap5_lec3 - Principle of Communication Eeng 360 1 Chapter...

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Unformatted text preview: Principle of Communication Eeng 360 1 Chapter 5 AM, FM, and Digital Modulated Systems Binary Bandpass Signalling Techniques OOK BPSK FSK Huseyin Bilgekul Eeng360 Communication Systems I Department of Electrical and Electronic Engineering Eastern Mediterranean University Principle of Communication Eeng 360 2 On–Off keying (OOK) [ amplitude shift keying ( ASK )] - Consists of keying (switching) a carrier sinusoid on and off with a unipolar binary signal.- Morse code radio transmission is an example of this technique.- OOK was one of the first modulation techniques to be used and precedes analog communication systems. Binary Phase-Shift Keying (BPSK)- Consists of shifting the phase of a sinusoidal carrier o or 180 o with a unipolar binary signal. - BPSK is equivalent to PM signaling with a digital waveform. Frequency-Shift Keying (FSK)- Consists of shifting the frequency of a sinusoidal carrier from a mark frequency (binary 1) to a space frequency (binary 0), according to the baseband digital signal. - FSK is identical to modulating an FM carrier with a binary digital signal. Binary Bandpass Signaling techniques Principle of Communication Eeng 360 3 Binary Bandpass Signaling techniques Principle of Communication Eeng 360 4 ( 29 ( 29 t m A t g c = The complex envelope is Carrier Cos(2 π f t) Message m(t) OOK output A m(t)Cos(2 π f t) The OOK signal is represented by...
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This note was uploaded on 05/24/2011 for the course EE 324 taught by Professor Emreaktaş during the Spring '11 term at Hacettepe Üniversitesi.

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chap5_lec3 - Principle of Communication Eeng 360 1 Chapter...

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