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Topic: Differential Encoding/Decoding vs Differential detection for QPSK
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Posts: 10
Registered: 5/24/12
Differential Encoding/Decoding vs Differential detection for QPSK
Posted: Mar 5, 2013 8:22 AM
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What is the difference between Differential encoded/decoded transmission QPSK and differential detected QPSK ?

I have simulated the 2 cases and found that differential encoded/decoded QPSK system has performance loss of 2dB at low SNR (around 0 dB) and low performance loss at high SNR region compared to normal QPSK curves.

When I simulate differential detected QPSK I experience about 3 dB loss compared to normal QPSK.

Can someone explain the reason for this behavior ?

Thanks in advance !

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