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EEEE2044 Coursework 2, Digital Modulation

Report format

Task 1: Change the parameter “Stop time” until you see that convergence of the BER value is achieved. Do this for at least 3 digital modulation techniques, namely QPSK, 16PSK and 64PSK. Once you have shown convergence you will need to use the appropriate value for the “Stop Time” for the rest of the coursework.

In Fig.1 plot the BER w.r.t. stop time for QPSK, 16PSK and 64PSK and comment on the results.

Fig.1. Convergence of BER results for QPSK, 16PSK and 64PSK modulations

Comment:

Task 2: In Fig.2 plot the BER for QPSK, 8PSK, 16PSK, 64PSK, 4QAM, 8QAM, 16QAM and 64QAM. The graph for each modulation is obtained by changing Eb/N ratio in AWGN block. The BER axis should be on a log scale.

Fig.2. Comparison of BER for QPSK, 8PSK, 16PSK, 64PSK, 4QAM, 8QAM, 16QAM and 64QAM

Comment on the results: (are the results logical and expected from what you have learned and how do they compare with other results (theoretical or other sources). Comments not to exceed this page.

Task 3 Tasks 1-2 have explored ideal coms channel with additive white noise. In reality communication channels are more damaging to the signal and can cause frequency shift of the carrier and time delay of received signals. These effects are incorporated in this Simulink example. Please familiarise with the example and then conduct BER analysis for the case of QPSK modulated signal.

In Fig.3 compare obtained result with the BER results for the QPSK signal from the Task 2.

Fig.3. Comparison of BER results for QPSK signal

Comment on the results: