Figure 5.17: BLER vs. SNR plot for 64QAM 2/3 modulation and coding profile on different SUI channel
5.2.4 Effect of Forward Error Correction
An interesting simulation of FEC is that without the concatenated ReedSolomon and Convolutional coder, how much performance degradation will appear in this design. To figure out how much improvement of the concatenated code, the QPSK ½ modulation and coding profile is chosen on SUI3 channel model. Figure 5.18 shows the performance of RSCC compared to no FEC. FEC improves the BER performance by almost 6dB at BER level of 103. Figure 5.19 shows the BLER performance for the same scenario. 10 dB SNR improvement is observed at BLER level of 10 2 .
The observations made in Figure 5.18 and Figure 5.19 is repeated for 16QAM 1/2 and 64QAM 2/3 modulation and coding pro iles also. It can be seen from the Figure 5.20
and 5.21 that FEC gains 7 dB improvement at BER level 3owhile 11.8 dB
at BLER level
o f 1 0 2 . I n c a s e o f
64QAM 2/3, Figure
o f 3
shows 4.5 dB
improvement is observed at BLER level of 10 2.