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TETRA MAC/PHY layer experimentation code
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========================================
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(C) 2010-2016 by Harald Welte <laforge@gnumonks.org> and contributors
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======================================================================
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This code aims to implement the sending and receiving part of the
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TETRA MAC/PHY layer.
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You will need libosmocore (http://bb.osmocom.org/trac/wiki/libosmocore) to link.
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== Demodulator ==
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Demodulator
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===========
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src/demod/python/cpsk.py
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* contains a gnuradio based pi4/DQPSK demodulator, courtesy of KA1RBI
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* contains a gnuradio based pi4/DQPSK demodulator, courtesy of KA1RBI
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src/demod/python/osmosdr-tetra_demod_fft.py
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* call demodulator on any source supported by gr-osmosdr
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(uhd, fcd, hackrf, blaerf, etc.)
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* call demodulator on any source supported by gr-osmosdr
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(uhd, fcd, hackrf, blaerf, etc.)
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src/demod/python/simdemod2.py
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* call demodulator on a 'cfile' containing complex baseband samples
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* call demodulator on a 'cfile' containing complex baseband samples
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src/demod/python/{uhd,fcdp}-tetra_demod.py
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* use demodulator directly with UHd or FCDP hadware (no gr-osmosdr)
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* use demodulator directly with UHd or FCDP hadware (no gr-osmosdr)
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The output of the demodulator is a file containing one float value for each symbol,
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containing the phase shift (in units of pi/4) relative to the previous symbol.
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@ -34,37 +39,41 @@ You can use the "float_to_bits" program to convert the float values to unpacked
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bits, i.e. 1-bit-per-byte
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== PHY/MAC layer ==
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PHY/MAC layer
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=============
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=== library code ===
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library code
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------------
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Specifically, it implements:
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lower_mac/crc_simple.[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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* CRC16-CCITT (currently defunct/broken as we need it for
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non-octet-aligned bitfields)
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lower_mac/tetra_conv_enc.[ch]
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* 16-state Rate-Compatible Punctured Convolutional (RCPC) coder
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* 16-state Rate-Compatible Punctured Convolutional (RCPC) coder
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lower_mac/tetra_interleave.[ch]
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* Block interleaving (over a single block only)
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* Block interleaving (over a single block only)
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lower_mac/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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* (30, 14) Reed-Muller code for the ACCH (broadcast block of
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each downlink burst)
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lower_mac/tetra_scramb.[ch]
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* Scrambling
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* Scrambling
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lower_mac/viterbi*.[ch]
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* Convolutional decoder for signalling and voice channels
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* Convolutional decoder for signalling and voice channels
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phy/tetra_burst.[ch]
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* Routines to encode continuous normal and sync bursts
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* Routines to encode continuous normal and sync bursts
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phy/tetra_burst_sync.[ch]
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=== Receiver Program ===
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Receiver Program
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----------------
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The main receiver program 'tetra-rx' expects an input file containing a
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stream of unpacked bits, i.e. 1-bit-per-byte.
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=== Transmitter Program ===
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Transmitter Program
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-------------------
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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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It does not actually modulate and/or transmit yet.
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== Quick example ==
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Quick example
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=============
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# assuming you have generated a file samples.cfile at a sample rate of
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# 195.312kHz (100MHz/512 == USRP2 at decimation 512)
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