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50 lines
1.6 KiB
Text
50 lines
1.6 KiB
Text
TETRA MAC/PHY layer experimentation code
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(C) 2010 by Harald Welte <laforge@gnumonks.org>
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======================================================================
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This code aims to implement the (so far) sending and (in the future)
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receiving part of the TETRA MAC/PHY layer.
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If you read the ETSI EN 300 392-2 (TETRA V+D Air Interface), you will
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find this code implementing the parts between the MAC-blocks (called
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type-1 bits) and the bits that go to the DQPSK-modulator (type-5 bits).
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It is most useful to look at Figure 8.5, 8.6, 9.3 and 19.12 in conjunction
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with this program.
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Specifically, it implements:
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lib_crc.[ch]
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* CRC16-CCITT (currently defunct/broken as we need it for
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non-octet-aligned bitfields)
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tetra_rm3014.[ch]
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* (30, 14) Reed-Muller code for the ACCH (broadcast block of
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each downlink burst)
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tetra_conv_enc.[ch]
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* 16-state Rate-Compatible Punctured Convolutional (RCPC) coder
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tetra_interleave.[ch]
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* Block interleaving (over a single block only)
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tetra_scramb.[ch]
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* Scrambling
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tetra_burst.[ch]
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* Routines to encode continuous normal and sync bursts
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testpdu.[ch]
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* Routines to build some example SYNC-PDU and SYSINFO-PDU
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The main program conv_enc_test.c generates a single continuous downlinc sync
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burst (SB), contining:
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* a SYNC-PDU as block 1
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* a ACCESS-ASSIGN PDU as broadcast block
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* a SYSINFO-PDU as block 2
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Scrambling is set to 0 (no scrambling) for all elements of the burst.
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You will need libosmocore (http://bb.osmocom.org/trac/wiki/libosmocore) to link.
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USAGE:
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src/float_to_bits data/dqpsk-float.dat data/out.bits
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src/burst_test data/out.bits
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