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question in coding techniques

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egstar

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in many coding techniques, when we use a certain technique to minimize probability of error,
and plot the coded curve with the uncoded curve such that in this figure,
the uncoded performance is better in the start of analysis at small SNR,
but the performance of the coded one appears at high SNR !!!!!!

i search for an explanation for this problem :)
ber_plot_bcc_soft_viterbi_decoder.png
 

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