Osmocom TETRA PHY/MAC implementation https://osmocom.org/projects/tetra
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TETRA MAC/PHY layer experimentation code
(C) 2010 by Harald Welte <firstname.lastname@example.org>
This code aims to implement the (so far) sending and (in the future)
receiving part of the TETRA MAC/PHY layer.
If you read the ETSI EN 300 392-2 (TETRA V+D Air Interface), you will
find this code implementing the parts between the MAC-blocks (called
type-1 bits) and the bits that go to the DQPSK-modulator (type-5 bits).
It is most useful to look at Figure 8.5, 8.6, 9.3 and 19.12 in conjunction
with this program.
Specifically, it implements:
* CRC16-CCITT (currently defunct/broken as we need it for
* (30, 14) Reed-Muller code for the ACCH (broadcast block of
each downlink burst)
* 16-state Rate-Compatible Punctured Convolutional (RCPC) coder
* Block interleaving (over a single block only)
* Routines to encode continuous normal and sync bursts
* Routines to build some example SYNC-PDU and SYSINFO-PDU
The main program conv_enc_test.c generates a single continuous downlinc sync
burst (SB), contining:
* a SYNC-PDU as block 1
* a ACCESS-ASSIGN PDU as broadcast block
* a SYSINFO-PDU as block 2
Scrambling is set to 0 (no scrambling) for all elements of the burst.
You will need libosmocore (http://bb.osmocom.org/trac/wiki/libosmocore) to link.
src/float_to_bits data/dqpsk-float.dat data/out.bits