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Which reduces the effective distance between signals in signal space?

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Which reduces the effective distance between signals in signal space?

(a) Time error

(b) Frequency offset

(c) Time error & Frequency offset

(d) None of the mentioned

The question was posed to me during an interview.

My question comes from Synchronization and Network Synchronization in section Synchronization of Digital Communications

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Correct option is (c) Time error & Frequency offset

To elaborate: Time error or frequency offset or combination of both will reduce the effective distance between signals in signal space and degrade error performance.

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