modulation - convolutional channel encoding

[Girly_girl]

Dear all.

I have a question regarding the different modulation type and their relationship with the convolutional channel encoding..

why does the lower order modulation formats (BPSK ...) have their BER graph more towards the lower Eb/No (dB) compared to higher order modulation formats e.g. (64 QAM..)?

thanks

 

[ckshivaram]

check this
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[Girly_girl]

Thanks , just went through these and none of them answered my question..