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Re-ordering/Interleaving

Re-ordering/Interleaving [Under GSM > Full rate speech coding illustration]

The 456 bits are re-ordered and partitioned in 8 bursts - even bits of first 4 bursts and odd bits of next 4 bursts - 57 bits in a burst (Ref 45.003:3.1.3).


Above bits are encrypted (using CK) and then actual bursts are formed. Normal burst have following format (Ref 45.002:5.2.3):

Tail bits(3) Info bits(57) Steal bit Training sequence(26) Steal bit Info bits(57) Tail bits(3)

Below are actual normal burst data (Ref 45.002:5.2.3,45.003:3.1.3/4):


References: GSM book by Mouly and Pautet.

© Copyright Samir Amberkar 2013

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