ECE 314B Week 10: SSB Concepts

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Questions and Answers

What occurs to the direction of the electric field when a radio wave reflects off a conducting surface?

  • It is scattered.
  • It remains unchanged.
  • It is reversed. (correct)
  • It is amplified.

Which of the following describes the behavior of radio-wave reflection?

  • Radio waves do not reflect off conducting surfaces.
  • The angle of reflection is not related to the angle of incidence.
  • It is covered by the principles of light-wave reflection. (correct)
  • It differs from light-wave reflection.

In the context of refraction, how is the index of refraction calculated?

  • By multiplying the speed of light in a medium by the speed of light in vacuum.
  • By dividing the speed of light in a medium by the speed of light in vacuum.
  • By dividing the speed of light in vacuum by the speed of light in a medium. (correct)
  • By adding the speeds of light in both contexts.

What does Snell's law describe in relation to refraction?

<p>The relationship between angles and indices of refraction. (D)</p> Signup and view all the answers

What is diffraction in the context of wave behavior?

<p>The bending of waves around obstacles. (C)</p> Signup and view all the answers

According to Huygen’s principle, how are individual points on a wave front treated?

<p>As point sources for additional spherical waves. (B)</p> Signup and view all the answers

When waves encounter an obstacle during diffraction, what happens to the wave front?

<p>It creates new wave fronts in the shadow zone. (A)</p> Signup and view all the answers

What principle states that electromagnetic waves can radiate as spherical waveforms from a source?

<p>Huygen’s Principle (B)</p> Signup and view all the answers

What is a key feature of a baseband signal in the context of SSB modulation?

<p>It must be bandpass. (D)</p> Signup and view all the answers

What is a consequence of not transmitting the carrier in SSB modulation?

<p>Decrease in transmitted power. (D)</p> Signup and view all the answers

What characterizes vestigial sideband (VSB) modulation?

<p>One sideband is transmitted along with a part of the other sideband. (A)</p> Signup and view all the answers

Which of the following methods can be used to demodulate SSB signals?

<p>Envelope detection. (A)</p> Signup and view all the answers

When comparing SSB to amplitude modulation (AM), which statement is true?

<p>SSB reduces the required bandwidth for transmission. (D)</p> Signup and view all the answers

In the phase shift method using the Hilbert transformer, which type of filter is emphasized?

<p>Non-causal filter. (A)</p> Signup and view all the answers

What is the result of using an envelope detector on the SSB+C signal?

<p>The extraction of the modulating signal. (D)</p> Signup and view all the answers

Which of the following is not a challenge in filter design for signal modulation?

<p>Handling low frequency components. (C)</p> Signup and view all the answers

What is the effect of relaxing the filter and baseband requirements in VSB modulation?

<p>It results in a modest increase in bandwidth. (A)</p> Signup and view all the answers

Which modulation technique involves using a carrier frequency to encode a message with a varying phase?

<p>Phase Modulation (PM) (B)</p> Signup and view all the answers

In the provided signal, what is the purpose of envelope detection in VSB transmission?

<p>To recover the modulating signal from the carrier wave. (D)</p> Signup and view all the answers

What is a primary drawback of using Double Sideband Amplitude Modulation (DSB)?

<p>Increased bandwidth requirements. (C)</p> Signup and view all the answers

Given a modulating signal $m(t) = cos(200 ext{ } imes ext{ } rac{ ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ }{t}) + 8{cos}(600 ext{ } imes ext{ } rac{ ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ } ext{ }{t})$, what type of amplitude modulation is being utilized?

<p>Vestigial Sideband Amplitude Modulation (VSB) (C)</p> Signup and view all the answers

What is the main characteristic that differentiates Frequency Modulation (FM) from Phase Modulation (PM)?

<p>FM varies the frequency of the carrier according to the message signal. (B)</p> Signup and view all the answers

When a message signal is transmitted via Single Sideband (SSB) modulation, what is a significant advantage compared to Double Sideband (DSB)?

<p>Lower bandwidth requirements. (B)</p> Signup and view all the answers

Flashcards

Radio Wave Reflection

Radio waves bounce off conducting surfaces, similar to light reflecting off a mirror.

Angle of Reflection

The angle at which a wave bounces off a surface is equal to the angle at which it hits the surface.

Phase Shift (Reflection)

When a wave reflects off a surface, the direction of its electric field reverses, which is a 180-degree phase shift.

Refraction

Bending of a wave as it passes through a medium with a different speed and density.

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Index of Refraction

Ratio of the speed of a wave in a vacuum to its speed in a medium.

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Snell's Law

Formula relating the angles and indices of refraction of a wave passing from one medium to another.

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Diffraction

Bending of waves around an obstacle.

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Huygen's Principle

Principle stating that all points on a wavefront can be considered sources of secondary spherical waves.

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VSB Modulation

A modulation technique used in analog TV transmission that reduces bandwidth compared to double sideband (DSB) modulation while maintaining good signal quality.

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Envelope Detection

A technique used to recover the modulating signal from a VSB+C (Vestigial Sideband plus Carrier) signal.

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DSB Modulation

A modulation technique that transmits both upper and lower sidebands of the modulating signal, resulting in a bandwidth twice that of the message signal.

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SSB Modulation

A modulation technique that transmits only one sideband of the modulating signal, reducing the bandwidth by half.

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Filtering Scheme

A set of filters used to shape and isolate specific frequency components in a signal.

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VSB Filter

A filter specifically designed for VSB modulation, shaping the spectrum of the transmitted signal in the receiver.

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Modulating Signal

The signal that carries information and is used to modify the carrier signal.

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Carrier Frequency

The frequency of the carrier wave, a constant frequency that enables transmission of information.

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Baseband Signal Requirement

Baseband signals need to be bandpass for transmission.

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Filter Design Challenges

Creating filters for signals with no low frequency components presents technical challenges.

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Phase Shift Method

Using a Hilbert transformer to create a phase shift to enable transmission.

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Non-Causal Filter

A non-causal filter processes data based on future values and hence is not physically implementable.

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SSB Demodulation

Signal processing method to recover the modulating signal from an SSB signal.

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SSB-SC Demodulation

Demodulation using synchronous processes for single sideband signals.

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SSB+C Demodulation

An envelope detector can effectively recover information from a SSB+C signal.

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SSB vs. AM Power Reduction

SSB signals use less power than AM signals as only one sideband is transmitted reducing transmitter power requirements.

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VSB Signal

A compromise between DSB and SSB, transmitting one sideband and a portion of the other to reduce bandwidth.

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Vestige of other sideband

A part of the other sideband, in VSB transmission, which reduce bandwidth.

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Study Notes

Learning Module: ECE 314B: Principles of Communications Systems

  • Course: ECE 314B, Principles of Communications Systems
  • Department: Electronics Engineering
  • Compiled by: Engr. Donnie Senomio
  • Year: 2020
  • Institution: Technological University of the Philippines Visayas

Learning Guide - Week 10

  • Topics:
    • Introduction to SSB
    • Modulation and demodulation
    • Types of SB (Sideband)
  • Learning Outcomes:
    • Understand the purpose of electronic communication systems for transferring information.
    • Explain how electronic communication involves transmission, reception, and processing of information.
  • Content/Technical Information - Single Sideband:
    • Purpose: Reduce bandwidth requirement of AM by half. Achieved by transmitting only the upper or lower sideband of a double sideband AM signal.

SSB Frequency

  • Diagrams showing different frequency representations for DSB and SSB.

SSB Math

  • Mathematical formulas and expressions related to SSB

SSB Hilbert

  • Defining SSB signal in terms of its Hilbert transform.

SSB Generator

  • Discuss different methods to generate SSB signals:
    • Selective Filtering: Using filters with sharp cutoff characteristics.
    • Phase shift method: Using Hilbert transformer.

SSB Demodulation

  • Discuss synchronous SSB-SC demodulation and envelope detection to demodulate SSB signals. Include formulas to calculate the efficiency.

SSB vs AM

  • Explain the power efficiency difference between SSB and AM.

VSB

  • Definition of VSB (vestigial sideband)
  • VSB is a compromise between DSB and SSB, with one sideband plus a remnant of the other transmitted.
  • VSB has a wider bandwidth than SSB but narrower than DSB
  • Filtering scheme for generating VSB.

VSB Transceiver

  • Diagram with descriptions of components and operations. Includes mathematical calculations and formulas to establish its operation.

Comparison of Modulation Types

  • Table comparing common modulation types (e.g., AM, DSB, SSB, QAM, VSB).

Progress Check

  • Questions regarding calculation and analysis in the context of AM, DSB, SSB methods.

Frequency Modulation (FM)

  • Topics:
    • Frequency modulation (FM) system description
    • Advantages of FM over AM

Modulation Index

  • Formulas and calculations related to modulation index (mf).

FM Waveform

  • Diagrams of AM and FM waveforms.
  • Describe FM signal representation, instantaneous frequency, relationship to modulating signal, etc.

FM Voltage

  • Discusses FM voltage calculations, modulation index, etc.
  • Includes examples for calculations, formulas for maximum deviation, etc.

Instantaneous Frequency Deviation

  • Definitions of instantaneous frequency and deviation, first-time derivative with formulas.

Deviation Sensitivity

  • Formulas and explanations relating to frequency deviation and deviation sensitivity, including frequency modulator.

List of References

  • Includes a variety of sources.

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