Error correction

Error correction To ensure adequate transmission, there are three
error connection methods used to ensure data is accurate:
1. One-third rate forward error correction (FEC) code
2. Two-thirds rate forward error correction (FEC) code
3. Automatic repeat request (ARQ)
The FEC mechanisms were created to reduce the number of repeat
transmissions. Throughput is curtailed by slower transmissions when
numerous repeats are requested. In a transmission environment not
prone to errors (short-range WLAN) this method is not usually
employed, but still has packet headers. ARQ mechanism must receive the header error code (HEC) as well as
the cyclic redundancy checks (CRC) so that when an acknowledgment is
sent, everything proceeds normally; however when it is not sent then
the data packet is transmitted over again.