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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 66 / 107

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Figure 5.13: BER vs. SNR plot for 16­QAM 1/2 on different SUI channel

5.2.3 BLER Plots

BLER results play a very important role in the study of PHY layer performance analysis. Fig. 5.14, 5.15 and 5.16 show the BLER performance of all the modulation and coding profiles on SUI­1, 2 and 3 channel models respectively. The results are consistent with the BER performance which we have observed in the previous section. In case of SUI­1 channel condition, QPSK modulation requires 3dB more SNR for 1/4 code improvement at BLER level 10­2. The same amount of SNR is required for 1/4 code rate improvement for 16­QAM modulation while 1.7 dB more SNR is required for 1/12 code r a t e i m p r o v e m e n t f o r 6 4 Q A M . S N R l e v e l r e q u i r e d t o a t t a i n 1 0 ­ 2 B L E R l e v e l f o r a l l t h e

rate

modulation Figure 5.17

and coding pro ile on different SUI channels are shows the performance of 64­QAM 2/3 on SUI­1, 2

tabulated in

Table 5.2.

and 3 channel

models.

The severity of corruption is also consistent with the BER improvement is observed in SUI­1 channel condition compared to dB improvement compared to SUI­3 channel at BLER level of 10 ­2.

performance. 4 dB SUI­2 channel and 9

SNR

55

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