if i change convolution encoder to 3/4 or 7/8 code rate can u tell BER shd improve wid comp to1/2 ?

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i have implemented MODEM which has Convolution encoder. when i change 1/2 to 3/4 or 7/8 . My BER for 3/4 or 7/8 comes out to be zero .....with AWGN as 1 db for Eb/No .is it right ?plese give ur suggestion

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