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Digital communication schemes + AWGN channel
Engineering and Construction
Pages 6 (1506 words)
DIGITAL COMMUNICATION SCHEMES + AWGN CHANNEL CONTENTS Number Topic Pages 1 Introduction to digital modulation schemes 1 2 Quadrature Phase Shift Key Modulation (QPSK) 2-3 3 Quadrature Amplitude Modulation (QAM) 3-4 4 Orthogonal frequency-division multiplexing (OFDM) 4-6 5 AWGN channel 6-7 Bibliography 8 Introduction The purpose of digital modulation schemes is collaborated with digital communication which is to convey digital information between two or more destinations.
In digital modulation, an analog transporter signal is adjusted with a digital information flow. Digital modulation techniques can be enumerated as digital-to-analog conversion, and the corresponding demodulation or detection as analog-to-digital conversion. The most essential digital modulation schemes are found on keying, that are PSK, FSK, ASK and QAM. In the subject of PSK; acronym of phase-shift keying, a finite number of phases are used. In the matter of FSK; short form of frequency-shift keying; a finite number of frequencies are used. In the topic of ASK; abbreviation of amplitude-shift keying, a finite number of amplitudes are used. In the area of QAM; meaning Quadrature amplitude modulation; a finite number of at least two phases and at least two amplitudes are used. An instrument that executes modulation is recognized as a modulator and an appliance that executes the converse process of modulation is identified as a demodulator, at times it is also called as detector. ...
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