How are SNR, Eb/N0, and BER related in digital communications?

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Multiple Choice

How are SNR, Eb/N0, and BER related in digital communications?

Explanation:
Increasing the energy per bit relative to the noise makes each bit more distinguishable at the receiver, so the chance of a bit being detected incorrectly drops. BER is the probability of a bit error and it is governed by Eb/N0 for a given modulation and coding. As Eb/N0 goes up, the decision thresholds are better protected against noise, leading to fewer errors. The relationship between SNR and Eb/N0 is that Eb/N0 is derived from the symbol energy and the bits per symbol (for binary signaling, Eb/N0 equals Es/N0; for higher-order schemes, Eb/N0 = Es/N0 divided by log2(M)). Regardless of the modulation, increasing Eb/N0 improves reliability, so BER decreases.

Increasing the energy per bit relative to the noise makes each bit more distinguishable at the receiver, so the chance of a bit being detected incorrectly drops. BER is the probability of a bit error and it is governed by Eb/N0 for a given modulation and coding. As Eb/N0 goes up, the decision thresholds are better protected against noise, leading to fewer errors. The relationship between SNR and Eb/N0 is that Eb/N0 is derived from the symbol energy and the bits per symbol (for binary signaling, Eb/N0 equals Es/N0; for higher-order schemes, Eb/N0 = Es/N0 divided by log2(M)). Regardless of the modulation, increasing Eb/N0 improves reliability, so BER decreases.

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