251 lines
6.7 KiB
Python
251 lines
6.7 KiB
Python
#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# GR-GSM based transceiver
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# Follow graph implementation
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#
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# (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com>
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#
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# All Rights Reserved
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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import pmt
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import time
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import grgsm
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import osmosdr
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from math import pi
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from gnuradio.filter import firdes
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from gnuradio import digital
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from gnuradio import blocks
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from gnuradio import uhd
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from gnuradio import gr
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# HACK: should be implemented in C++!
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import numpy as np
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class burst_type_filter(gr.sync_block):
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def __init__(self, burst_types=[]):
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gr.sync_block.__init__(
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self,
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name='Burst type filter',
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in_sig=[],
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out_sig=[]
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)
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self.burst_types = burst_types
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self.message_port_register_in(pmt.intern("bursts_in"))
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self.message_port_register_out(pmt.intern("bursts_out"))
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self.set_msg_handler(pmt.intern("bursts_in"), self.filter)
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def filter(self, msg):
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burst_with_header = pmt.to_python(pmt.cdr(msg))
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burst = burst_with_header[-148:]
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header = np.ndarray.tolist(burst_with_header[0:-148])
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burst_type = header[12]
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if burst_type in self.burst_types:
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self.message_port_pub(pmt.intern("bursts_out"), msg)
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class burst_to_fn_time(gr.basic_block):
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def __init__(self): # only default arguments here
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gr.basic_block.__init__(
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self,
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name='Burst to fn_time',
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in_sig=[],
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out_sig=[]
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)
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self.message_port_register_in(pmt.intern("bursts_in"))
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self.message_port_register_out(pmt.intern("fn_time_out"))
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self.set_msg_handler(pmt.intern("bursts_in"), self.convert)
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def convert(self, msg):
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fn_time = pmt.dict_ref(pmt.car(msg),pmt.intern("fn_time"),pmt.PMT_NIL)
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fn_time_msg = pmt.dict_add(pmt.make_dict(), pmt.intern("fn_time"), fn_time)
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if pmt.to_python(fn_time) is not None:
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self.message_port_pub(pmt.intern("fn_time_out"), fn_time_msg)
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class radio_if(gr.top_block):
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# PHY specific variables
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rx_freq = 935e6
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tx_freq = 890e6
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# Application state flags
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trx_started = False
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# GSM timings
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delay_correction = 285.616e-6
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ul_dl_shift = -(6.0/1625000*(156.25)*3)
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def __init__(self, phy_args, phy_sample_rate,
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phy_rx_gain, phy_tx_gain, phy_ppm,
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phy_rx_antenna, phy_tx_antenna,
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trx_remote_addr, trx_base_port):
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print("[i] Init Radio interface")
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# PHY specific variables
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self.rx_gain = phy_rx_gain
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self.tx_gain = phy_tx_gain
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gr.top_block.__init__(self, "GR-GSM TRX")
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# TRX Burst Interface
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self.trx_burst_if = grgsm.trx_burst_if(
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trx_remote_addr, str(trx_base_port))
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# RX path definition
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self.phy_src = uhd.usrp_source(phy_args,
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uhd.stream_args(cpu_format="fc32",
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channels=range(1)))
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self.phy_src.set_center_freq(self.rx_freq, 0)
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self.phy_src.set_antenna(phy_rx_antenna, 0)
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self.phy_src.set_samp_rate(phy_sample_rate)
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self.phy_src.set_bandwidth(650e3, 0)
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self.phy_src.set_gain(phy_rx_gain)
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self.gsm_input = grgsm.gsm_input(
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ppm = phy_ppm - int(phy_ppm), osr = 4,
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fc = self.rx_freq, samp_rate_in = phy_sample_rate)
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self.gsm_receiver = grgsm.receiver(4, ([0]), ([]))
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self.gsm_clck_ctrl = grgsm.clock_offset_control(
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self.rx_freq, phy_sample_rate, osr = 4)
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self.ts_filter = grgsm.burst_timeslot_filter(0)
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self.ts_filter.set_policy(grgsm.FILTER_POLICY_DROP_ALL)
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# Connections
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self.connect(
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(self.phy_src, 0),
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(self.gsm_input, 0))
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self.connect(
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(self.gsm_input, 0),
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(self.gsm_receiver, 0))
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self.msg_connect(
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(self.gsm_receiver, 'C0'),
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(self.ts_filter, 'in'))
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self.msg_connect(
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(self.ts_filter, 'out'),
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(self.trx_burst_if, 'bursts'))
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self.msg_connect(
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(self.gsm_receiver, 'measurements'),
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(self.gsm_clck_ctrl, 'measurements'))
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self.msg_connect(
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(self.gsm_clck_ctrl, 'ctrl'),
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(self.gsm_input, 'ctrl_in'))
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# TX Path Definition
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self.phy_sink = uhd.usrp_sink(phy_args,
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uhd.stream_args(cpu_format="fc32",
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channels=range(1)), "packet_len")
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self.phy_sink.set_antenna(phy_tx_antenna, 0)
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self.phy_sink.set_samp_rate(phy_sample_rate)
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self.phy_sink.set_center_freq(self.tx_freq, 0)
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self.phy_sink.set_gain(self.tx_gain)
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self.tx_time_setter = grgsm.txtime_setter(
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0xffffffff, 0, 0, 0, 0, 0,
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self.delay_correction + self.ul_dl_shift)
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self.tx_burst_proc = grgsm.preprocess_tx_burst()
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self.pdu_to_tagged_stream = blocks.pdu_to_tagged_stream(
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blocks.byte_t, 'packet_len')
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self.gmsk_mod = grgsm.gsm_gmsk_mod(
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BT = 4, pulse_duration = 4, sps = 4)
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self.burst_shaper = digital.burst_shaper_cc(
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(firdes.window(firdes.WIN_HANN, 16, 0)),
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0, 20, False, "packet_len")
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# Connections
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self.msg_connect(
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(self.trx_burst_if, 'bursts'),
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(self.tx_time_setter, 'bursts_in'))
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self.msg_connect(
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(self.tx_time_setter, 'bursts_out'),
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(self.tx_burst_proc, 'bursts_in'))
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self.msg_connect(
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(self.tx_burst_proc, 'bursts_out'),
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(self.pdu_to_tagged_stream, 'pdus'))
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self.connect(
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(self.pdu_to_tagged_stream, 0),
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(self.gmsk_mod, 0))
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self.connect(
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(self.gmsk_mod, 0),
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(self.burst_shaper, 0))
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self.connect(
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(self.burst_shaper, 0),
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(self.phy_sink, 0))
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# RX & TX synchronization
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self.bt_filter = burst_type_filter([3])
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self.burst_to_fn_time = burst_to_fn_time()
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# Connections
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self.msg_connect(
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(self.gsm_receiver, 'C0'),
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(self.bt_filter, 'bursts_in'))
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self.msg_connect(
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(self.bt_filter, 'bursts_out'),
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(self.burst_to_fn_time, 'bursts_in'))
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self.msg_connect(
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(self.burst_to_fn_time, 'fn_time_out'),
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(self.tx_time_setter, 'fn_time'))
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def shutdown(self):
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print("[i] Shutdown Radio interface")
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self.stop()
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self.wait()
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def set_rx_freq(self, fc):
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self.phy_src.set_center_freq(fc, 0)
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self.gsm_clck_ctrl.set_fc(fc)
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self.gsm_input.set_fc(fc)
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self.rx_freq = fc
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def set_tx_freq(self, fc):
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self.phy_sink.set_center_freq(fc, 0)
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self.tx_freq = fc
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def set_rx_gain(self, gain):
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self.phy_src.set_gain(gain, 0)
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self.rx_gain = gain
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def set_tx_gain(self, gain):
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self.phy_sink.set_gain(gain, 0)
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self.tx_gain = gain
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