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Performance Evaluation of WiMAX/IEEE 802.16 OFDM Physical Layer - page 52 / 107

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Chapter 5

Simulation Results

In this chapter the simulation results are shown and discussed. In the following sections, first we will present the structure of the implemented simulator and then we will present the simulation results both in terms of validation of implementation and values for various parameters that characterize the performance of the physical layer.

5.1 The Simulator

We have developed the simulator in Matlab™ using modular approach. Each block of the transmitter, receiver and channel is written in separate ´m´ ile. The main procedure call each of the block in the manner a communication system works. The main procedure also contains initialization parameters, input data and delivers results. The parameters that can be set at the time of initialization are the number of simulated OFDM symbols, CP length, modulation and coding rate, range of SNR values and SUI channel model for simulation. The input data stream is randomly generated. Output variables are available in Matlab™ workspace while BER and BLER values for different SNR are stored in text files which facilitate to draw plots. Each single block of the transmitter is tested with its counterpart of the receiver side to confirm that each block works perfectly.

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