**6. Summary**

0 5 10 15 20 25 30 35 40

0 5 10 15 20 25 30 35

Eb / N0 [dB]

Without Peak reduction With Proposed Method

Without companding With companding

SNR [dB]

10-5

**Figure 21.** BER Performances over SUI 5 and AWGN.

10-5

**Figure 22.** BER Performance over AWGN only.

10-4

10-3

BER

10-2

10-1

100

10-4

10-3

BER

10-2

10-1

100

56 Selected Topics in WiMAX

We have investigated the PAPR in the WiMAX system. We investigates the simulation performance of WiMAX OFDM PHY Layer in the Presence of Nonlinear Power Amplifier and the new method is suggested to reduce PAPR where the simulation results show that, the peak power reduces by about 4 dB and SNR also decreases more than 5 dB at BER =10-4. The Stanford University Interim (SUI) channel models are selected for the wireless channel in the simulation. Moreover the equalizer performance with SUI multipaths channel is explained.
