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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 63 / 107

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5.2.2 BER Plots

In this section we have presented various BER vs. SNR plots for all the mandatory modulation and coding profiles as speci ied in the standard on same channel models. Figure 5.10, 5.11 and 5.12 show the performance on SUI­1, 2 and 3 channel models

respectively. It can be seen from this igures that the scheme provides better performance with less SNR. This can look at their constellation mapping; larger distance between larger noise (which makes the point shift from the original

lower modulation and coding be easily visualized if we adjacent points can tolerate place) at the cost of coding

rate. By setting threshold SNR, adaptive modulation schemes can be highest transmission speed with a target BER. SNR required to attain BER are tabulated in Table 5.1.

used to l e v e l a t 1 0 ­ 3

attain

Figure 5.10: BER vs. SNR plot for different coding profiles on SUI­1 channel

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