Piotr Krysik
commit
1afe0c2985
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@ -19,6 +19,7 @@
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<block>gsm_fcch_detector</block>
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<block>gsm_clock_offset_control</block>
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<block>gsm_input</block>
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<block>gsm_wideband_input</block>
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</cat>
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<cat>
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<name>Logical channels demapping</name>
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@ -19,6 +19,7 @@
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install(FILES
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gsm_input.xml
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gsm_wideband_input.xml
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gsm_receiver.xml
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gsm_fcch_burst_tagger.xml
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gsm_sch_detector.xml
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@ -0,0 +1,78 @@
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<block>
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<name>GSM wideband input adaptor</name>
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<key>gsm_wideband_input</key>
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<category></category>
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<import>import grgsm</import>
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<make>grgsm.gsm_wideband_input(
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ppm=$ppm,
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osr=$osr,
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fc=$fc,
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samp_rate_in=$samp_rate_in,
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ca=$cell_allocation,
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)</make>
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<callback>set_ppm($ppm)</callback>
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<callback>set_osr($osr)</callback>
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<callback>set_fc($fc)</callback>
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<callback>set_samp_rate_in($samp_rate_in)</callback>
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<param>
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<name>ppm</name>
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<key>ppm</key>
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<value>ppm</value>
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<type>float</type>
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<hide>part</hide>
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</param>
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<param>
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<name>OSR</name>
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<key>osr</key>
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<value>osr</value>
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<type>int</type>
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<hide>part</hide>
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</param>
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<param>
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<name>fc</name>
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<key>fc</key>
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<value>fc</value>
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<type>float</type>
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<hide>part</hide>
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</param>
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<param>
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<name>Cell allocation</name>
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<key>cell_allocation</key>
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<value>[]</value>
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<type>float_vector</type>
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<hide>part</hide>
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</param>
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<param>
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<name>samp_rate_in</name>
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<key>samp_rate_in</key>
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<value>samp_rate_in</value>
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<type>float</type>
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<hide>part</hide>
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</param>
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<param>
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<name>Num Streams</name>
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<key>num_streams</key>
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<value>1</value>
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<type>int</type>
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<hide>part</hide>
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</param>
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<check>$num_streams >= 0</check>
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<sink>
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<name>in</name>
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<type>complex</type>
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<vlen>1</vlen>
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</sink>
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<sink>
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<name>ppm_in</name>
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<type>message</type>
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<optional>True</optional>
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</sink>
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<source>
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<name>out</name>
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<type>complex</type>
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<vlen>1</vlen>
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<nports>$num_streams</nports>
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</source>
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<doc>Piotr Krysik
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Adaptor of input stream for the GSM receiver. Contains frequency offset corrector and resampler to correct carrier frequency and sampling frequency offsets. At the end it has LP filter for filtering of a GSM channel.</doc>
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</block>
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@ -32,9 +32,10 @@ GR_PYTHON_INSTALL(
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FILES
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__init__.py
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receiver/gsm_input.py
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receiver/gsm_wideband_input.py
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receiver/fcch_burst_tagger.py
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receiver/sch_detector.py
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receiver/fcch_detector.py
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receiver/fcch_detector.py
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receiver/chirpz.py
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misc_utils/arfcn.py
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misc_utils/clock_offset_corrector.py DESTINATION ${GR_PYTHON_DIR}/grgsm
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@ -57,4 +58,3 @@ GR_ADD_TEST(qa_burst_sdcch_subslot_filter ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_S
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GR_ADD_TEST(qa_burst_fnr_filter ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_burst_fnr_filter.py)
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GR_ADD_TEST(qa_dummy_burst_filter ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_dummy_burst_filter.py)
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GR_ADD_TEST(qa_arfcn ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_arfcn.py)
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@ -51,6 +51,7 @@ from sch_detector import sch_detector
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from fcch_detector import fcch_detector
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from clock_offset_corrector import clock_offset_corrector
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from gsm_input import gsm_input
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from gsm_wideband_input import gsm_wideband_input
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import arfcn
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@ -0,0 +1,119 @@
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#!/usr/bin/env python
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##################################################
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# Gnuradio Python Flow Graph
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# Title: GSM wideband input adaptor
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# Author: Piotr Krysik
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# Co-author: Pieter Robyns
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# Description: Adaptor of input stream for the GSM receiver. Contains frequency ofset corrector doing also resampling to integer multiplies of GSM sample rate and LP filter filtering GSM channel.
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##################################################
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from gnuradio import filter
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from gnuradio import gr
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from gnuradio import eng_notation
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from gnuradio.filter import firdes
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import grgsm.arfcn as arfcn
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import grgsm
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class gsm_wideband_input(gr.hier_block2):
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def __init__(self, ppm=0, osr=4, fc=925.2e6, samp_rate_in=20e6, ca=[]):
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self.num_streams = len(ca)
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gr.hier_block2.__init__(
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self, "GSM wideband input adaptor",
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gr.io_signature(1, 1, gr.sizeof_gr_complex*1),
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gr.io_signature(self.num_streams, self.num_streams, gr.sizeof_gr_complex*1),
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)
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##################################################
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# Parameters
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##################################################
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self.ppm = ppm
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self.osr = osr
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self.fc = fc
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self.samp_rate_in = samp_rate_in
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self.ca = ca
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self.blocks_fir_filters = {}
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self.blocks_resamplers = {}
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self.blocks_ocs = {}
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self.band = band = 'E-GSM' # TODO make selectable
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##################################################
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# Variables
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##################################################
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self.samp_rate_out = samp_rate_out = 1625000.0/6.0*osr
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##################################################
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# Blocks
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##################################################
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self.ppm_in = None
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self.message_port_register_hier_out("ppm_in")
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#self.lpf = firdes.low_pass(1, samp_rate_out, 125e3, 5e3, firdes.WIN_HAMMING, 6.76)
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self.lpf = firdes.low_pass(1, samp_rate_in, 125e3, 75e3, firdes.WIN_HAMMING, 6.76)
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self.gsm_clock_offset_corrector_0 = grgsm.clock_offset_corrector(
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fc=fc,
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ppm=ppm,
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samp_rate_in=samp_rate_in,
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)
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c0_arfcn = arfcn.downlink2arfcn(fc, band)
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print("Extracting channels %s, given that the center frequency is at ARFCN %d (%s)" % (str(ca), c0_arfcn, eng_notation.num_to_str(fc)))
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self.connect((self, 0), (self.gsm_clock_offset_corrector_0, 0))
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output_port = 0
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for channel in ca:
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channel_freq = arfcn.arfcn2downlink(channel, band)
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if channel_freq is None:
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print("Warning: invalid ARFCN %d for band %s" % (channel, band))
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continue
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freq_diff = channel_freq - fc
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print("ARFCN %d is at C0 %+d KHz" % (channel, int(freq_diff / 1000.0)))
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self.blocks_resamplers[channel] = filter.fractional_resampler_cc(0, samp_rate_in/samp_rate_out)
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self.blocks_fir_filters[channel] = filter.freq_xlating_fir_filter_ccc(1, self.lpf, freq_diff, samp_rate_in)
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self.connect((self.gsm_clock_offset_corrector_0, 0), (self.blocks_fir_filters[channel], 0))
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self.connect((self.blocks_fir_filters[channel], 0), (self.blocks_resamplers[channel], 0))
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self.connect((self.blocks_resamplers[channel], 0), (self, output_port))
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output_port += 1
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##################################################
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# Asynch Message Connections
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##################################################
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self.msg_connect(self, "ppm_in", self.gsm_clock_offset_corrector_0, "ppm_in")
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def get_ppm(self):
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return self.ppm
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def set_ppm(self, ppm):
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self.ppm = ppm
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self.gsm_clock_offset_corrector_0.set_ppm(self.ppm)
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def get_fc(self):
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return self.fc
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def set_fc(self, fc):
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self.fc = fc
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self.gsm_clock_offset_corrector_0.set_fc(self.fc)
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def get_osr(self):
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return self.osr
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def set_osr(self, osr):
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self.osr = osr
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self.set_samp_rate_out(1625000.0/6.0*self.osr)
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def get_samp_rate_in(self):
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return self.samp_rate_in
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def set_samp_rate_in(self, samp_rate_in):
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self.samp_rate_in = samp_rate_in
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for channel in self.blocks_resamplers:
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self.blocks_resamplers[channel].set_resamp_ratio(self.samp_rate_in / self.samp_rate_out)
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self.gsm_clock_offset_corrector_0.set_samp_rate_in(self.samp_rate_in)
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def get_samp_rate_out(self):
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return self.samp_rate_out
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def set_samp_rate_out(self, samp_rate_out):
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self.samp_rate_out = samp_rate_out
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for channel in self.blocks_resamplers:
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self.blocks_resamplers[channel].set_resamp_ratio(self.samp_rate_in / self.samp_rate_out)
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