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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 85 / 107

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on the PHY layer. The overall system performance was also evaluated under different channel conditions. Scatter plots were generated to validate the model in terms of general trends in reception quality as we vary different parameters. A key performance measure of a wireless communication system is the BER and BLER. The BER and BLER curves were used to compare the performance of different modulation and coding scheme used. The effects of the FEC and interleaving were also evaluated in the form of BER and BLER. These provided us with a comprehensive evaluation of the performance of the OFDM physical layer for different states of the wireless channel.

6.2 Future Works

The implemented PHY layer model still needs some improvement. The channel estimator can be implemented to obtain a depiction of the channel state to combat the effects of the channel using an equalizer.

The IEEE 802.16 standard comes with many optional PHY layer features, which can be implemented to further improve the performance. The optional Block Turbo Coding (BTC) can be implemented to enhance the performance of FEC. Space Time Block Code (STBC) can be employed in DL to provide transmit diversity.

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