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Why is pulse shaping technique used?

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Why is pulse shaping technique used?

(a) To increase ISI

(b) To increase spectral width of modulated signal

(c) To reduce ISI

(d) To reduce power spectral density

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I'd like to ask this question from Pulse Shaping Techniques in portion Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct choice is (c) To reduce ISI

Explanation: Pulse shaping techniques reduces the intersymbol interference. They are also used to reduce the spectral width of the modulated digital signal.

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