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how to reduce the BER in simulink model for a tx rx chain?

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shumail

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hi,
can anyone tell me how to reduce the BER in a simulink model. it starts with rand signal gen, then BFSK, then upconversion and finally to speaker from where mic recieves signal via air or a simple wire, down converts filters and demodulate the signal. But when i calculate the BER of this model, it comes out to be 0.5. how to make it zero??
 

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