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QAM Modulator and Demodulator Two real messages, m₁(t) and m2(t). m₁ is modulated on a cosine, and m2(t) mi(t) ✗ 24 H(f) m1,r(t) Cos(2πfet)+ WY B B x(t) Propagation Cos(2π fet) m2(t) 24 H m2,r(t) ✗ -B B sin(2π fet) sin(2π fet) Receiver Transmitter Note that we need a synchronous receiver, or the two channels will interfere. What happens with a 90° phase shift?

QAM Modulator and Demodulator Two real messages, m₁(t) and m2(t). m₁ is modulated on a cosine, and m2(t) mi(t) ✗ 24 H(f) m1,r(t) Cos(2πfet)+ WY B B x(t) Propagation Cos(2π fet) m2(t) 24 H m2,r(t) ✗ -B B sin(2π fet) sin(2π fet) Receiver Transmitter Note that we need a synchronous receiver, or the two channels will interfere. What happens with a 90° phase shift?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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QAM Modulator and Demodulator Two real messages, m₁(t) and m2(t). m₁ is modulated on a cosine, and m2(t) mi(t) ✗ 24 H(f) m1,r(t) Cos(2πfet)+ WY B B x(t) Propagation Cos(2π fet) m2(t) 24 H m2,r(t) ✗ -B B sin(2π fet) sin(2π fet) Receiver Transmitter Note that we need a synchronous receiver, or the two channels will interfere. What happens with a 90° phase shift?
Transcribed Image Text:QAM Modulator and Demodulator Two real messages, m₁(t) and m2(t). m₁ is modulated on a cosine, and m2(t) mi(t) ✗ 24 H(f) m1,r(t) Cos(2πfet)+ WY B B x(t) Propagation Cos(2π fet) m2(t) 24 H m2,r(t) ✗ -B B sin(2π fet) sin(2π fet) Receiver Transmitter Note that we need a synchronous receiver, or the two channels will interfere. What happens with a 90° phase shift?
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