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Which of the following is the ratio of the throughput data rate per Hertz?

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Which of the following is the ratio of the throughput data rate per Hertz?

(a) Bandwidth efficiency

(b) Spectral density

(c) Power efficiency

(d) Power density

I have been asked this question in an interview for job.

My question is based upon Digital Modulation topic in portion Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct option is (a) Bandwidth efficiency

The explanation is: Bandwidth efficiency reflects how efficiently the allocated bandwidth is utilized. It is defined as the ratio of throughput data rate per Hertz in a given bandwidth. It describes the ability of a modulation scheme to accommodate data within a limited bandwidth.

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