Virtual Labs

What is the primary goal of diversity in wireless communication systems?

a: Increase the number of transmitted data streams Explanation

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b: Improve spectral efficiency Explanation

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c: Combat fading and improve reliability Explanation

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d: Reduce antenna spacing Explanation

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What is the main goal of spatial multiplexing in MIMO systems?

a: Increase time diversity Explanation

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b: Reduce bit error rate Explanation

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c: Increase data rate by transmitting multiple streams Explanation

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d: Minimize transmit power Explanation

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Which of the following sentences correctly describes the difference between multiplexing and diversity?

a: Diversity increases data rate by transmitting multiple data streams simultaneously. Explanation

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b: Multiplexing improves reliability by using multiple antennas to mitigate fading effects. Explanation

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c: Diversity enhances reliability through spatial, temporal, or frequency techniques. Explanation

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d: Multiplexing mitigates fading effects by utilizing independent fading paths between antennas. Explanation

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In a MIMO system, if we prioritize diversity over multiplexing, what is the expected outcome?

a: Higher data rate with higher probability of error Explanation

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b: Lower data rate with lower probability of error Explanation

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c: Higher data rate with lower probability of error Explanation

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d: Lower data rate with higher probability of error Explanation

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In a 2×2 MIMO system, using all antennas for diversity instead of multiplexing will:

a: Increase the number of independent data streams Explanation

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b: Reduce reliability Explanation

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c: Improve robustness to fading Explanation

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d: Increase interference Explanation

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Which of the following techniques provides diversity gain but not multiplexing gain?

a: V-BLAST Explanation

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b: Spatial multiplexing Explanation

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c: Space-Time Block Coding (STBC) Explanation

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d: OFDMA Explanation

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When channel conditions are poor (deep fading, low SNR), which is generally preferable?

a: Spatial multiplexing Explanation

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b: Time multiplexing Explanation

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c: Diversity techniques Explanation

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d: Equal gain combining Explanation

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In which of the following scenarios is spatial multiplexing most beneficial?

a: Low SNR and slow fading Explanation

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b: High SNR and rich scattering Explanation

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c: Flat channels with high correlation Explanation

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d: Static channels with line-of-sight only Explanation

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Multiplexing vs. Diversity