Bandwidth Efficiency in Digital Modulation

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What is the primary advantage of Differential Binary Phase-Shift Keying (DBPSK)?

Simplicity of its implementation without needing a carrier recovery circuit (correct)

Ability to transmit data over longer distances without signal degradation

Lower signal-to-noise ratio (S/N) requirement for error-free transmission

Higher data transfer rate compared to other modulation techniques

What is the purpose of the squaring loop in carrier recovery?

To remove the modulation and generate the second harmonic of the carrier frequency (correct)

To decrease the carrier frequency for better reception

To increase the spectral width of the received noise

To eliminate the need for phase-locked loop (PLL) tracking

What are the basic elements of a Phase-Locked Loop (PLL) used in carrier recovery?

Amplifier, attenuator, modulator

Demodulator, mixer, oscillator

Phase comparator/detector, loop filter, voltage-controlled oscillator (VCO) (correct)

Filter, buffer, inverter

What does Differential Phase Shift Keying (DBPSK) use to contain the binary input information?

Difference between two successive signaling elements Signup and view all the answers

What is the purpose of a clock recovery circuit?

To recover clocking information from the receive data Signup and view all the answers

What is the formula for bandwidth efficiency?

Bη = transmission rate (bps) / minimum BW (Hz) Signup and view all the answers

Which modulation scheme has a bandwidth efficiency of 2 bps/Hz?

QPSK Signup and view all the answers

What is the bandwidth efficiency of 8-PSK modulation?

3 bps/Hz Signup and view all the answers

What does carrier recovery involve in a receiver signal?

Extracting phase-coherent reference Signup and view all the answers

Which modulation scheme uses the least amount of bandwidth for a single bit transmission?

BPSK Signup and view all the answers

Which modulation scheme has the highest bandwidth efficiency?

16-QAM Signup and view all the answers

What is the bandwidth efficiency of QPSK modulation?

2 bps/Hz Signup and view all the answers

What is the process of extracting a phase-coherent reference from a receiver signal called?

Carrier recovery Signup and view all the answers

Which modulation technique uses the least amount of bandwidth for a single bit transmission?

BPSK Signup and view all the answers

What is the purpose of a clock recovery circuit in digital communication?

To maintain synchronization between the transmitter and receiver clocks Signup and view all the answers

What is the primary advantage of using Differential Binary Phase-Shift Keying (DBPSK)?

It does not need a carrier recovery circuit for demodulation Signup and view all the answers

What is the purpose of the squaring loop in carrier recovery?

To remove the modulation and generate the second harmonic of the carrier frequency Signup and view all the answers

What is the function of a clock recovery circuit?

To recover clocking information from the received data Signup and view all the answers

Which modulation scheme requires the least amount of bandwidth for a single bit transmission?

Binary Phase Shift Keying (BPSK) Signup and view all the answers

What is the purpose of the phase-locked loop (PLL) in carrier recovery?

To track and synchronize with the second harmonic of the carrier frequency Signup and view all the answers

Bandwidth Efficiency in Digital Modulation

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Questions and Answers

What is the primary advantage of Differential Binary Phase-Shift Keying (DBPSK)?

What is the purpose of the squaring loop in carrier recovery?

What are the basic elements of a Phase-Locked Loop (PLL) used in carrier recovery?

What does Differential Phase Shift Keying (DBPSK) use to contain the binary input information?

What is the purpose of a clock recovery circuit?

What is the formula for bandwidth efficiency?

Which modulation scheme has a bandwidth efficiency of 2 bps/Hz?

What is the bandwidth efficiency of 8-PSK modulation?

What does carrier recovery involve in a receiver signal?

Which modulation scheme uses the least amount of bandwidth for a single bit transmission?

Which modulation scheme has the highest bandwidth efficiency?

What is the bandwidth efficiency of QPSK modulation?

What is the process of extracting a phase-coherent reference from a receiver signal called?

Which modulation technique uses the least amount of bandwidth for a single bit transmission?

What is the purpose of a clock recovery circuit in digital communication?

What is the primary advantage of using Differential Binary Phase-Shift Keying (DBPSK)?

What is the purpose of the squaring loop in carrier recovery?

What is the function of a clock recovery circuit?

Which modulation scheme requires the least amount of bandwidth for a single bit transmission?

What is the purpose of the phase-locked loop (PLL) in carrier recovery?

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