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Which of the following is an important factor in determining spectral efficiency of the system?

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Which of the following is an important factor in determining spectral efficiency of the system?

(a) Multiple access technique

(b) Cell size

(c) Modulation technique

(d) Vocoder

I have been asked this question during an online interview.

This is a very interesting question from Speech Codecs in chapter Speech Coding of Wireless/Mobile

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Best answer
Right option is (a) Multiple access technique

For explanation I would say: The type of multiple access technique used is an important factor in determining the spectral efficiency of the system. It strongly influences the choice of speech codec.

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