6.2.4 BICM Decoder
The decoding metric in (6.129) for the BICM decoder is defined in (3.22), and thus,
6.183 
where
6.184 
6.185 
The PEP in (6.139) is then calculated as
6.186 
6.188 
where 
are the random variables modeling the L-values 
, 
was expressed as 
, and where, because of the linearity of the code, the error codeword 
satisfies .
For any such that (i.e., when ), the L-values do ...
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