[op25-dev] LCWs: hamming, rs, serialization

Matt D md123 at nycap.rr.com
Fri Jul 12 20:04:14 UTC 2013


I am trying to get a handle on the data in the Link Control Word.  The
LCW is 72 bits right?  On transmission the 72 bit LCW is serialized into
12 hex bits. And then it is encoded with a (24,12,13) RS code to yield
24 hex bits. The 24 hex bits are then encoded with a (10,6,3) shortened
Hamming code to yield 240 bits total.

Is it known how the bits are serialized?  Or better yet is there an
existing function for unserializing/serializing that will work here?

And the Hamming and RS codes: does anyone have functions for decoding
(10,6,3) Hamming and (24,12,13) RS code?

If these decoders do not exist already, where should I start?

Matt D
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