Es/No problem?
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Posted by Davy on March 12, 2006, 11:03 am
Please log in for more thread options Hi all, In Error correcting code, code_bits=. I am confused with Es/No definition: Es/No = Eb/No*data_bits_per_frame/symbols_per_frame; Why not: Es/No = Eb/No*code_bits_per_frame/symbols_per_frame; Best regards, Davy | ||||||||||||||||
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Posted by Oli Filth on March 12, 2006, 11:41 am
Please log in for more thread options Davy said the following on 12/03/2006 16:03: Because Eb/No is (usually) defined in terms of the energy per *data* bit. So for an (n,k) code: Ebc = Ebi * (k / n) where Ebi is the energy per data bit, and Ebc is the energy per code bit. And for an M-ary symbol constellation: Es = Ebc * log2(M) Therefore: Es = Ebi * (k / n) * log2(M) But (k / n) * log2(M) is the number of data bits per symbol. Therefore: Es/No = Ebi/No * data bits per symbol -- Oli | ||||||||||||||||
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>
> In Error correcting code, code_bits=.
>
> I am confused with Es/No definition:
> Es/No = Eb/No*data_bits_per_frame/symbols_per_frame;
>
> Why not:
> Es/No = Eb/No*code_bits_per_frame/symbols_per_frame;
>