L06_I-Q_modulation

L06_I-Q_modulation - I/Q Modulation Issues with coherent...

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1 6.02 Spring 2008 Lecture 6 I/Q Modulation, Slide 1 I/Q Modulation Issues with coherent modulation Analog I/Q modulation principles All rights reserved. 6.02 Spring 2008 Lecture 6 I/Q Modulation, Slide 2 AM Modulation and Demodulation Multiplication (i.e., mixing ) operation shifts in frequency Also creates undesired high frequency components at receiver Lowpass filtering passes only the desired baseband signal at receiver What can go wrong here?
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2 6.02 Spring 2008 Lecture 6 I/Q Modulation, Slide 3 Impact of 90 Degree Phase Shift If receiver cosine wave turns into a sine wave, we suddenly receive no baseband signal! We apparently need to synchronize the phase of the transmitter and receiver local oscillators This is called coherent demodulation Some key questions: How do we analyze this issue? What would be the impact of a small frequency offset? 6.02 Spring 2008 Lecture 6
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This note was uploaded on 08/23/2009 for the course EECS 6.02 taught by Professor Terman during the Spring '08 term at MIT.

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L06_I-Q_modulation - I/Q Modulation Issues with coherent...

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