Lect13_Digital Modulation (I)

Lect13_Digital Modulation (I) - ECE 620 Introduction to RF...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Digital Modulation (I) 13 1
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Outline Constellation Diagrams 2
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Digital Communication Systems Advancements in VLSI and DSP have made digital transmission more cost efficient and more robust than analog transmission systems Major industry transition has occurred from simple analog AM/FM to new digital modulation techniques Advent of digital modulation created another layer of complexity to add diversity to signals In addition to FDMA , different signals can be separated from one another using TDMA and CDMA. Advantages of digital modulation Greater noise immunity Power efficiency Easier multiplexing of information (voice, data, video) Can accommodate digital transmission errors, coding, and equalization Improved security (e.g. encryption) DSP can implement digital modulators, demodulators completely in software 3
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Channel Parameters Bit rate, R Defines the number of bits transmitted per second Aka. data rate Example: Audio system with 8-bit sampler (8 bit A/D) and signal sampling rate
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This note was uploaded on 11/21/2011 for the course ECE 620 taught by Professor Khalil during the Fall '11 term at Ohio State.

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Lect13_Digital Modulation (I) - ECE 620 Introduction to RF...

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