TETRA MAC/PHY layer experimentation code
(C) 2010 by Harald Welte <laforge@gnumonks.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:
	lib_crc.[ch]
		* CRC16-CCITT (currently defunct/broken as we need it for
		  non-octet-aligned bitfields)
	tetra_rm3014.[ch]
		* (30, 14) Reed-Muller code for the ACCH (broadcast block of
		  each downlink burst)
	tetra_conv_enc.[ch]
		* 16-state Rate-Compatible Punctured Convolutional (RCPC) coder
	tetra_interleave.[ch]
		* Block interleaving (over a single block only)
	tetra_scramb.[ch]
		* Scrambling
	tetra_burst.[ch]
		* Routines to encode continuous normal and sync bursts
	testpdu.[ch]
		* 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.



USAGE:

	src/float_to_bits data/dqpsk-float.dat data/out.bits

	src/burst_test data/out.bits