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The bandwidth efficiency of an M-ary FSK signal ________ with ________ in M.

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The bandwidth efficiency of an M-ary FSK signal ________ with ________ in M.

(a) Constant, increase

(b) Increases, increase

(c) Decreases, increase

(d) Decreases, decrease

The question was posed to me in unit test.

The above asked question is from Combined Linear and Constant Envelope Modulation Techniques topic in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right option is (c) Decreases, increase

The best explanation: The bandwidth efficiency of an M-ary FSK signal decreases with increase in M. Therefore, unlike M-PSK signals, M-FSK signals are bandwidth inefficient.

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