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Communication SystemsChannel Coding

In polynomial representation of cyclic codes, multiplication by x followed by reduction modulo x^n-1 corresponds to?

  • AA cyclic shift
  • BAmplitude clipping
  • CSampling
  • DFrequency translation only
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Correct Answer: A. A cyclic shift
Explanation: Multiplication by x shifts polynomial coefficients; modulo x^n-1 wraps the end coefficient around, implementing a cyclic shift.
Reference: Standard communication systems: cyclic-code polynomial representation
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