Forward Error Correction (FEC)
Forward error correction is a technique that adds redundant data to a transmission so that the receiver can find and fix errors without asking for the data to be sent again.
What is Forward Error Correction (FEC)?
Radio and optical links suffer from noise and interference. FEC encodes data with extra check bits, using codes such as LDPC and polar codes in 5G, so that a certain number of corrupted bits can be corrected on arrival. More redundancy makes the link more robust but leaves less room for user data.