Lect14_Digital Modulation (II)

Lect14_Digital Modulation (II) - ECE 620 Introduction to RF...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Digital Modulation (II) 14 1
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Outline Constellation Diagrams Digital Modulation Types ASK BFSK BPSK M-ary 2
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Constellations A constellation diagram is a graphical representation of the complex envelope of m unique symbol states The bandwidth efficiency is proportional to the number of constellation points (i.e. m states) Densely packed implies BW efficient 3 I Q d min
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Polar Representation The signal is expressed in polar form as a magnitude and phase relative to a reference signal The carrier becomes a frequency and phase reference and the signal is interpreted relative to the carrier 4 Mag Mag Change MSK Phase Change PSK Mag & Phase Change, QAM Freq. Change FSK
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Cartesian (IQ) Representation Rectangular representation of the polar diagram The I axis lies on the zero degree phase reference, and the Q axis is rotated by 90 degrees
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Lect14_Digital Modulation (II) - ECE 620 Introduction to RF...

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