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Anybody be kindfull to find high BER reason? 3x

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Eric.Lee

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The Matlab simulink model is attached below.

After add the AWGN and multipath fading, the constellation is messy. And then i add the MLSE equalizer, the constellation seems ok, but the rx data rate seems half below the tx data rate. Please help to find the reason, 3x.

B. R.
Eric
 

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