IV. Adaptive FEC (Forward Error Correction)
FEC (Forward Error Correction) is another loss recovery technology using parity data. The
sender generates parity packets from original data packets and the receiver recovers the
lost packets with the original packets and parity packets that have already been received.
In general, the recovery performance of FEC is not affected by the RTT. Therefore, FEC is
more effective and suitable than ARQ in long RTT networks. However, FEC needs a larger
amount of packets for recovery than ARQ.
The Adaptive FEC function of the Network RX Station and Wireless Adapter improves
recovery performance for sudden packet loss, by enlarging the size of the FEC block and
optimizing blocks. Moreover, Adaptive FEC can adjust the ratio of parity packets in the FEC
block according to network conditions such as the RTT. It reduces parity packets and yet
can satisfy the expected recovery performance, and this improves image quality.