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LAB REPORT 3 - Wichita State University, Lab Reports of Electrical and Electronics Engineering

Wichita State University (WSU)Electrical and Electronics Engineering
Prof. Yanwu Ding

LAB REPORT 3 - Wichita State University

Typology: Lab Reports

2022/2023

Uploaded on 04/24/2023

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Ton 1
Nguyen Huu Tam Ton
Z368Q723
Feb 6th, 2023
Lab3 – DSBSC modulation
I. Introduction:
- Double-sideband suppressed-carrier transmission (DSB-SC) is a kind of transmission in which
the amplitude modulation (AM) frequencies are symmetrically spaced above and below the
carrier frequency and the carrier level is decreased to the lowest practicable level, preferably
fully suppressed.
DSBSC = the message × the carrier
- The DSBSC signal, crucially, lacks a sinewave at the carrier frequency. As a result, the presence
of both sidebands but the lack of the carrier gives rise to the name of this modulation method -
double-sideband, suppressed carrier modulation (DSBSC).
II. Lab report:
Part A: Generating a DSBSC signal using a simple sine message.
a. Message signal
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Nguyen Huu Tam Ton Z368Q Feb 6th, 2023 Lab3 – DSBSC modulation I. Introduction:

  • Double-sideband suppressed-carrier transmission (DSB-SC) is a kind of transmission in which the amplitude modulation (AM) frequencies are symmetrically spaced above and below the carrier frequency and the carrier level is decreased to the lowest practicable level, preferably fully suppressed. DSBSC = the message × the carrier
  • The DSBSC signal, crucially, lacks a sinewave at the carrier frequency. As a result, the presence of both sidebands but the lack of the carrier gives rise to the name of this modulation method - double-sideband, suppressed carrier modulation (DSBSC). II. Lab report: Part A: Generating a DSBSC signal using a simple sine message. a. Message signal

Time domain plot m(t) = 2sin(2𝝅2kt) and Frequency domain plot M(f) b. Carrier signal

  1. Time domain plot c(t) = 2cos(2𝝅100kt)
  1. Frequency domain plot U(f) Part B: DSBSC modulation with sin +DC signal.

a. Message signal

  1. Time domain plot m(t) = 2sin(2𝝅2k t) + 1.5 and Frequency domain plot M(f) b. DSB - SC modulated signal u(t) = m (t).c(t) = [2sin(2𝝅2kt ) + 1.5].cos( 2𝝅 100 kt )
  2. Frequency domain plot U(f)
  1. Frequency domain plot M(f)
    • We were unable to record the frequency domain plot result due to certain issues with the NI ELVIS II. b. DSB-SC modulated signal u(t) = m(t).c(t)
    1. Time domain plot u(t)
  1. Frequency domain plot C(f)
    • We were unable to record the frequency domain plot result due to technical issues with the NI ELVIS II.