User Guide: Technical Reference
SECTION 2
ioLink 4
SYSTEM COMPONENTS
PRELIMINARY
Customer Support (202) 333-7031
2-13
Figure 2-7. Forward Error Correction (FEC) Improvement of Bit Error Rate (BER)
for Differential Quadrature Phase Shift Keying (DQPSK)
Note:
This chart does not represent the actual performance of FEC in every situation. It is meant to show
that the addition of FEC circuitry in the
ioLink 4
improves BER as seen by the user equipment.
How FEC improves DQPSK performance
1.00E-07
1.00E-06
1.00E-05
1.00E-04
1.00E-03
1.00E-02
1.00E-01
0
2
4
6
8
10
12
14
16
Signal to Noise Ratio [dB]
Bit
Error Rat
e
BER before FEC
BER after FEC
