FEC
Shannon Δf→∞
-10dB -5dB 0dB 5dB 10dB
1
0.1
0.01
0.001
10-4
10-5
10-6
0.5
Bit-Error Rate
BER
MESSAGE
MESSAGE
PARITY
MESSAGE
FEC
CODER
FEC
DECODER
NOISY
COMMUNICATION
CHANNEL
CORRUPTED!
CORRECTED!
10log10(S/N)
4dB
-1.6dB
0.5dB
Turbo 3Δf
25 – Forward Error Correction (FEC)