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What is the advantage of spectrum widening in RZ encodings?

What is the advantage of spectrum widening in RZ encodings?
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Answer #1

. Majority of signal energy lies in frequencies less than 0.5 of the symbol rate
R = 1/Tb.
2. Small spectrum at dc facilitates carrier tracking, and important in tape
recording with poor dc response.
3. Small spectrum at dc, lower magnetic-tape recording speed can be used
(higher packing density is possible).
4. Insensitive to 180o phase ambiguity common to NRZ-L and Manchester
coding.
5. Bandwidth requirements are approximately half those needed by Manchester
coding.

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