Virtual Labs

Study of Frequency division multiplexed schemes

1. What does OFDM stand for?

a: Orthogonal Frequency Division Multiplexing Explanation

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b: Orthogonal Frequency Division Modulation Explanation

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c: Orthogonal Frequency Division Management Explanation

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d: Orthogonal Frequency Data Modulation Explanation

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2. Which of the following is a key advantage of OFDM?

a: Increased latency Explanation

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b: Resistance to multipath fading Explanation

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c: Reduced spectral efficiency Explanation

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d: Simplified receiver design Explanation

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3. What technique does OFDM use to separate data streams?

a: Time Division Multiplexing Explanation

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b: Frequency Division Multiplexing Explanation

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c: Code Division Multiplexing Explanation

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d: Orthogonal subcarriers Explanation

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4. In OFDM, what does the term 'cyclic prefix' refer to?

a: A method of frequency reuse Explanation

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b: A guard interval added to prevent inter-symbol interference Explanation

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c: The number of subcarriers used Explanation

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d: A modulation technique Explanation

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5. Which modulation technique is commonly used in OFDM systems?

a: QAM (Quadrature Amplitude Modulation) Explanation

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b: BPSK (Binary Phase Shift Keying) Explanation

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c: FSK (Frequency Shift Keying) Explanation

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d: ASK (Amplitude Shift Keying) Explanation

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6. What is the primary function of the inverse Fast Fourier Transform (IFFT) in OFDM?

a: To convert time-domain signals to frequency-domain signals Explanation

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b: To modulate the signal onto a carrier frequency Explanation

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c: To create orthogonal subcarriers from frequency-domain signals Explanation

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d: To demodulate received signals Explanation

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7. What is a common application of OFDM?

a: Digital broadcasting Explanation

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b: Satellite communications Explanation

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c: Wi-Fi networks Explanation

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d: All of the above Explanation

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8. What role does the Fast Fourier Transform (FFT) play in OFDM?

a: It generates the input signal Explanation

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b: It converts the time-domain signal to frequency-domain Explanation

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c: It modulates the signal onto a carrier Explanation

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d: It demodulates the received signal Explanation

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9. How does OFDM improve spectral efficiency?

a: By using a single carrier frequency Explanation

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b: By utilizing orthogonality among subcarriers Explanation

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c: By reducing the number of bits transmitted Explanation

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d: By using a higher baud rate Explanation

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10. What is the purpose of the guard interval in OFDM?

a: To allow for frequency drift Explanation

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b: To prevent inter-symbol interference Explanation

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c: To enhance signal strength Explanation

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d: To improve data rates Explanation

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