Description: Abstruct- We describe novel interleaver and deinterleaver
architectures that support bandwidth efficient memory access for
decoders of turbo-like codes that are used in conjunction with
high order modulations. The presentation focuses on a decoder
for serially concatenated pulse-position modulation (SCPPM),
which is a forward-error-correction code designed by NASA to
support laser communications from Mars at more than 50 megabits-
per-second (Mbps). For 64-ary PPM, the new architectures
effectively triple the fan-in of the interleaver and fan-out of the
deinterleaver, enabling parallelization that doubles the overall
throughput. The techniques described here can be readily modified
for other PPM orders.
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