Mike,

there are roughly 3 ways you can parallelize these algorithms:
1) packet-level: run a lot of codewords at the same time
2) subblock level: divide each codeword into pieces (overlapping) and run
SISOs on each one of them in parallel
3) trellis level: do ACS operations in parallel

take a look at the following link and references to get some ideas (not
claiming it is a seminal paper though :-))

http://web.eecs.umich.edu/~anastas/docs/turbogpu.pdf

best,
Achilleas
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