Simulation parameters for each snr point in the

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Simulation Parameters For each SNR point in the vector snr a number of packets are generated, passed through a channel and demodulated to determine the packet error rate. The number of packets tested at each SNR point is controlled by two parameters: 1. maxNumPEs is the maximum number of packet errors simulated at each SNR point. When the number of packet errors reaches this limit, the simulation at this SNR point is complete. 2. maxNumPackets is the maximum number of packets simulated at each SNR point and limits the length of the simulation if the packet error limit is not reached. Processing SNR Points For each SNR point a number of packets are tested and the packet error rate calculated. For each packet the following processing steps occur: A PSDU is created and encoded to create a single packet waveform. The waveform is passed through a different realization of the TGn channel model. AWGN is added to the received waveform to create the desired average SNR per subcarrier after OFDM demodulation and comm.AWGNChannel is configured to provide the correct SNR. The configuration accounts for normalization within the channel by the
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P a g e | 8 number of receive antennas, and the noise energy in unused subcarriers which are removed during OFDM demodulation. The packet is detected. Coarse carrier frequency offset is estimated and corrected. Fine timing synchronization is established. The L-STF, L-LTF and L-SIG samples are provided for fine timing to allow for packet detection at the start or end of the L-STF. Fine carrier frequency offset is estimated and corrected. The HT-LTF is extracted from the synchronized received waveform. The HT-LTF is OFDM demodulated and channel estimation is performed. The HT Data field is extracted from the synchronized received waveform. The PSDU is recovered using the extracted field and the channel estimate. Further Exploration The number of packets tested at each SNR point is controlled by two parameters; maxNumPEs and maxNumPackets. For meaningful results it is recommended that these values should be larger than those presented in this example. Increasing the number of packets simulated allows the PER under different scenarios to be compared.
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