Digital CommunicationHardQuestion 20288
Question
Error correction coding in digital communication adds:
- AExtra bits (redundancy) to detect and correct errors caused by channel noiseCorrect
- BCompression to reduce bit rate
- CEncryption for security
- DModulation index control
Correct answer
Extra bits (redundancy) to detect and correct errors caused by channel noise
Explanation
Channel coding (Hamming, Reed-Solomon, Turbo, LDPC, Polar codes) adds structured redundancy. The receiver uses this redundancy to identify and correct bit errors. Rate = k/n (k info bits in n total bits). Used in CDs, DVDs, deep-space communication, 4G/5G.