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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 77 / 107

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5.2.6 Effect of Bit interleaver

The effect of bit interleaving on the performance of different modulation and coding schemes has been observed here. It can be seen from the Figure 5.30 and 5.31 that bit interleaver gains 2.2 dB SNR improvement at BER level of 10­3 and 1 dB improvement at B L E R l e v e l o f 1 0 ­ 2 f o r B P S K . F i g u r e 5 . 3 2 t o F i g u r e 5 . 3 7 s h o w t h e p e r f o r m a n improvement due to bit interleaver for QPSK ½, 16­QAM ½ and 64­QAM 2/3. The SNR improvement observed from the figures are tabulated in Table 5.4. In this case, we have conducted all the simulation on SUI­2 channel model. c e

BPSK 1/2

QPSK 1 /2

16­QAM 1/2

64­QAM 2 /3

2.2

0.8

1.4

2.2

1

1.2

1.7

2.5

Table 5.4: Performance improvement due to bit interleaving

Modulation Code Rate SNR(dB) at BER 10­3 SNR(dB) at BLER 10­2

66

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