Question
How does forward error correction (FEC) allow the receiver to correct data errors?
Answer Options
- A) By controlling transmitter output power for optimum signal strength
- B) By using the Varicode character set
- C) By transmitting redundant information with the data
- D) By using a parity bit with each character
Correct Answer: C
Explanation
Forward Error Correction (FEC) is a technique used in many digital modes (like FT8 and Winlink Robust mode) to improve reliability, particularly under poor signal conditions. Instead of requiring the entire packet to be re-sent when an error occurs, FEC embeds the correction data with the original data.
FEC works by transmitting redundant information with the data. This redundant information (mathematically calculated parity or check bits) allows the receiving station’s decoder to use the extra bits to identify and correct a certain number of bit errors in the corrupted packet without having to request a retransmission.
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