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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 69 / 107

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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

improvement

at BLER level

improvement

is observed

o f 1 0 ­ 2 . I n c a s e o f

at

BER

level

64­QAM 2/3, Figure

o f ­ 3

1and

Figure

5.22 5.23

shows 4.5 dB

shows

10

dB

improvement is observed at BLER level of 10 ­2.

58

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