I have a project for QPSK Modulation-Demodulation.
I set the below block in simulink
Bernoulli Data Source==>QPSK Modulator==>Multipath Rayleigh Channel(Also with delay vector and ga,n)==>AWGN Channel==>LMS Equalizer(Decision Feedback Equalizer)==>QPSK Demodulator ==> BER Calculator
BER is too high the problem is when I added LMS DFE in the model and the BER is about 0.5,
The SNR(increasing) does not solve the problem.
How can I solve this?
I look for some help
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