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?

The relationship between angles and indices of refraction. Signup and view all the answers

What is diffraction in the context of wave behavior?

The bending of waves around obstacles. Signup and view all the answers

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

As point sources for additional spherical waves. Signup and view all the answers

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

It creates new wave fronts in the shadow zone. Signup and view all the answers

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

Huygen’s Principle Signup and view all the answers

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

It must be bandpass. Signup and view all the answers

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

Decrease in transmitted power. Signup and view all the answers

What characterizes vestigial sideband (VSB) modulation?

One sideband is transmitted along with a part of the other sideband. Signup and view all the answers

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

Envelope detection. Signup and view all the answers

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

SSB reduces the required bandwidth for transmission. Signup and view all the answers

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

Non-causal filter. Signup and view all the answers

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

The extraction of the modulating signal. Signup and view all the answers

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

Handling low frequency components. Signup and view all the answers

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

It results in a modest increase in bandwidth. Signup and view all the answers

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

Phase Modulation (PM) Signup and view all the answers

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

To recover the modulating signal from the carrier wave. Signup and view all the answers

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

Increased bandwidth requirements. 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?

Vestigial Sideband Amplitude Modulation (VSB) Signup and view all the answers

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

FM varies the frequency of the carrier according to the message signal. 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)?

Lower bandwidth requirements. Signup and view all the answers

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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Description

This quiz focuses on Week 10 of ECE 314B, covering the principles of Single Sideband (SSB) modulation and demodulation. You'll explore the purpose of electronic communication systems and the types of sidebands used in transmission. Test your understanding of the key concepts and mathematical formulations related to SSB.