Compared with a sinc() shaped Nyquist pulse, the Raised Cosine, or RC, pulse (with non-zero rolloff factor) has the following advantage:Question 4AnswerThe time-domain ripples have a smaller amplitudeThe time delay is shorterThe bandwidth is smallerThe OOB emissions are reduced
Question
Compared with a sinc() shaped Nyquist pulse, the Raised Cosine, or RC, pulse (with non-zero rolloff factor) has the following advantage:Question 4AnswerThe time-domain ripples have a smaller amplitudeThe time delay is shorterThe bandwidth is smallerThe OOB emissions are reduced
Solution
The advantage of the Raised Cosine (RC) pulse with a non-zero rolloff factor compared to a sinc() shaped Nyquist pulse is that the Out Of Band (OOB) emissions are reduced.
Here's why:
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The sinc() function is an ideal Nyquist pulse, meaning it has zero Inter Symbol Interference (ISI). However, it has infinite bandwidth, which is not practical for real-world applications.
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The Raised Cosine (RC) pulse is a modification of the sinc() function that allows us to control the bandwidth. The rolloff factor is a parameter that determines the extent of this bandwidth control.
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A non-zero rolloff factor means that some bandwidth expansion is allowed. This results in a pulse shape that still has zero ISI, but now with a finite, controllable bandwidth.
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The trade-off for this bandwidth control is that energy is spread into adjacent frequency bands, causing Out Of Band (OOB) emissions. However, these OOB emissions are still less than what would be observed with a sinc() function.
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Therefore, the advantage of the RC pulse with a non-zero rolloff factor is that it reduces OOB emissions compared to a sinc() shaped Nyquist pulse.
Similar Questions
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