Virtual Labs

Study of effect of channel on system with various modulation

Question 1: In a Rayleigh fading channel, what is the primary reason for the variation in the received signal's amplitude?

a: The transmitter's power is inconsistent. Explanation

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b: Multipath propagation leading to constructive and destructive interference. Explanation

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c: The receiver's antenna is malfunctioning. Explanation

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d: The message signal is inherently unstable. Explanation

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Question 2: Which parameter is most crucial when analyzing the performance of a communication system under AWGN?

a: The bandwidth of the communication channel. Explanation

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b: The modulation scheme used. Explanation

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c: The signal-to-noise ratio (SNR). Explanation

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d: The type of coding applied. Explanation

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Question 3: What is the effect of increasing the transmission power in a Rayleigh fading environment?

a: It has no effect on the received signal. Explanation

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b: It reduces the effects of fading but does not eliminate them. Explanation

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c: It guarantees perfect signal reception. Explanation

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d: It increases the likelihood of interference. Explanation

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Question 4: How does the presence of multipath components in a Rayleigh fading channel influence the modulation scheme selection?

a: It favors modulation schemes that are more resilient to phase shifts. Explanation

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b: It necessitates the use of higher frequency modulation schemes. Explanation

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c: It has no impact on the choice of modulation schemes. Explanation

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d: It requires simpler modulation techniques only. Explanation

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Question 5: Which technique is often used to combat the effects of AWGN in digital communication systems?

a: Increased bandwidth. Explanation

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b: Adaptive equalization. Explanation

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c: Higher modulation orders. Explanation

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d: Error correction coding. Explanation

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Question 6: What statistical model is often used to describe the behavior of signals in a Rayleigh fading channel?

a: Normal distribution. Explanation

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b: Uniform distribution. Explanation

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c: Rayleigh distribution. Explanation

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d: Exponential distribution. Explanation

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Question 7: In the context of AWGN, which factor directly influences the Bit Error Rate (BER)?

a: The distance between transmitter and receiver. Explanation

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b: The modulation technique employed. Explanation

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c: The encoding scheme used. Explanation

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d: All of the above. Explanation

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Question 8: What is the significance of the Doppler shift in a Rayleigh fading environment?

a: It stabilizes the received signal. Explanation

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b: It introduces frequency variations due to relative motion. Explanation

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c: It guarantees error-free communication. Explanation

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d: It simplifies the channel equalization process. Explanation

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Question 9: In practical systems, what is the typical approach to enhance performance in the presence of Rayleigh fading?

a: Using single-input single-output (SISO) systems. Explanation

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b: Implementing diversity techniques. Explanation

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c: Opting for lower bandwidth channels. Explanation

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d: Exclusively using analog signals. Explanation

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Question 10: Which of the following statements about the effects of AWGN and Rayleigh fading is true?

a: AWGN only affects the amplitude of the signal. Explanation

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b: Rayleigh fading can be completely mitigated with appropriate modulation. Explanation

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c: AWGN is predictable, while Rayleigh fading is inherently random. Explanation

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d: Both AWGN and Rayleigh fading have no impact on communication system design. Explanation

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