Virtual Labs

Study of effect of channel on system with various modulation

1. How does Rayleigh fading affect the amplitude of the received message signal?

a: It causes the amplitude to remain constant. Explanation

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b: It introduces variations and fluctuations in amplitude. Explanation

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c: It amplifies the message signal. Explanation

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d: It reduces the frequency of the message signal. Explanation

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2. What is one major consequence of AWGN on the received message signal?

a: It enhances the clarity of the message. Explanation

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b: It introduces additional randomness to the signal. Explanation

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c: It eliminates all forms of distortion. Explanation

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d: It increases the signal-to-noise ratio. Explanation

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3. Which of the following best describes the impact of Rayleigh fading on communication channels?

a: It stabilizes the signal during transmission. Explanation

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b: It leads to constructive and destructive interference. Explanation

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c: It improves the signal quality. Explanation

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d: It guarantees a constant received signal strength. Explanation

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4. How does the presence of AWGN influence the recovery of the original message signal?

a: It facilitates the recovery process. Explanation

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b: It has no impact on the recovery process. Explanation

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c: It complicates the recovery due to added noise. Explanation

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d: It guarantees accurate recovery of the signal. Explanation

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5. What effect does Rayleigh fading have on the signal-to-noise ratio (SNR)?

a: It increases the SNR. Explanation

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b: It decreases the SNR. Explanation

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c: It has no effect on SNR. Explanation

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d: It stabilizes the SNR. Explanation

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6. Which type of modulation is most affected by AWGN in terms of signal recovery?

a: Amplitude Modulation (AM) Explanation

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b: Frequency Modulation (FM) Explanation

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c: Phase Modulation (PM) Explanation

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d: All types of modulation are equally affected. Explanation

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7. What is a common method used to mitigate the effects of Rayleigh fading?

a: Use of higher frequencies. Explanation

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b: Implementation of equalization techniques. Explanation

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c: Increase the transmission power. Explanation

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d: Switching to digital modulation only. Explanation

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8. What role does channel coding play in relation to AWGN?

a: It reduces the power of the noise. Explanation

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b: It helps in error correction during signal recovery. Explanation

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c: It eliminates the noise completely. Explanation

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d: It guarantees high signal clarity. Explanation

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9. How does AWGN impact the Bit Error Rate (BER) of the received message signal?

a: It reduces the BER significantly. Explanation

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b: It has no impact on BER. Explanation

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c: It increases the BER as the noise increases. Explanation

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d: It guarantees zero BER. Explanation

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10. What is the primary challenge posed by Rayleigh fading in mobile communication?

a: It ensures constant signal strength. Explanation

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b: It causes signal fluctuations that affect quality. Explanation

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c: It has no effect on the quality of signals. Explanation

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d: It improves overall communication reliability. Explanation

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