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For the QPSK modulator shown in the figure below, change the +90° phase-shift network to -90°. Obtain the (a) truth table; (b) sketch the new phasor diagram; and (c) sketch the new constellation diagram. I channel f/2 t sin oet Balanced modulator Logic 1 -+1 V Logic 0 = -1 V Bandpass Binary input data f filter sin mct Reference carrier oscillator (sin w̟t) QPSK |output BPF Bit Linear splitter summer 90° phase shift +2 Bit clock Bandpass filter cos oct Logic 1 = +1 V Logic 0 = -1 V Balanced modulator Q channel fp/2 tcos aet

For the QPSK modulator shown in the figure below, change the +90° phase-shift network to -90°. Obtain the (a) truth table; (b) sketch the new phasor diagram; and (c) sketch the new constellation diagram. I channel f/2 t sin oet Balanced modulator Logic 1 -+1 V Logic 0 = -1 V Bandpass Binary input data f filter sin mct Reference carrier oscillator (sin w̟t) QPSK |output BPF Bit Linear splitter summer 90° phase shift +2 Bit clock Bandpass filter cos oct Logic 1 = +1 V Logic 0 = -1 V Balanced modulator Q channel fp/2 tcos aet

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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For the QPSK modulator shown in the figure below, change the +90° phase-shift network to -90°. Obtain the (a) truth table; (b) sketch the new phasor diagram; and (c) sketch the new constellation diagram. I channel fp/2 t sin wct Balanced modulator Logic 1 = +1 V Logic 0 = -1 V Binary input data fb Bandpass filter sin wet Reference carrier ocillator (sin wct) QPSK output I Bit Linear BPF splitter summer 90° phase shift +2 Bit clock Bandpass filter cos oct Logic 1 = +1 V Logic 0 = -1 V Balanced modulator Q channel fp/2 tcos wet QPSK modulator
Transcribed Image Text:For the QPSK modulator shown in the figure below, change the +90° phase-shift network to -90°. Obtain the (a) truth table; (b) sketch the new phasor diagram; and (c) sketch the new constellation diagram. I channel fp/2 t sin wct Balanced modulator Logic 1 = +1 V Logic 0 = -1 V Binary input data fb Bandpass filter sin wet Reference carrier ocillator (sin wct) QPSK output I Bit Linear BPF splitter summer 90° phase shift +2 Bit clock Bandpass filter cos oct Logic 1 = +1 V Logic 0 = -1 V Balanced modulator Q channel fp/2 tcos wet QPSK modulator
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