PPT Slide

Turbo codes : soft-input soft-output (SISO) decoding

at the end ...

L(u) = Lc.y + Ledec1(u) + Ledec2(u)

L(u) = log p(u=1 | R)

p(u=0 | R)

~ P( U | Dec1 )

~ P( U | Dec2 )

~ P( U )

a priori

~ P( C )

‘intrinsic’

‘extrinsic’

‘intrinsic’

‘extrinsic’

?

?-1

~ P( U )

a priori

~ P( C )

amplitude = confiability

sign = hard-decision

SISO = log-likelihood information amplifier!

log-likelihood

information

MAP or SOVA algorithms

MAP or SOVA algorithms

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