Question about log map in turbo decoder

[imen]

Hello,
Is there any one who has an idea about how to compute the LAPPR (log a posteriori probability ratio) of parity bit, no relevant LAPPRs are directly provided by my turbo decoder. Only the LAPPR of systematic bit are computed because the log-map computes only the LAPPR of these bit.

Thanks

[trunutsa]

i am using chase decoder for TPC. but i may be using LogMAP also in near future. i will reply at that time. my email id is
[e-mail]
if you can forward me a mail, we can discuss.

trunutsa