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#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: GSM input adaptor
# Author: Piotr Krysik
# 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.
# Generated: Wed Nov 19 08:23:52 2014
##################################################
from gnuradio import filter
from gnuradio import gr
from gnuradio.filter import firdes
from distutils.version import LooseVersion as version
import grgsm
class gsm_input(grgsm.hier_block):
def __init__(self, ppm=0, osr=4, fc=940e6, samp_rate_in=1e6):
grgsm.hier_block.__init__(
self, "GSM input adaptor",
gr.io_signature(1, 1, gr.sizeof_gr_complex*1),
gr.io_signature(1, 1, gr.sizeof_gr_complex*1),
)
##################################################
# Parameters
##################################################
self.ppm = ppm
self.osr = osr
self.fc = fc
self.samp_rate_in = samp_rate_in
##################################################
# Variables
##################################################
self.samp_rate_out = samp_rate_out = 1625000.0/6.0*osr
##################################################
# Blocks
##################################################
self.message_port_register_hier_in("ctrl_in")
self.low_pass_filter_0_0 = filter.fir_filter_ccf(1, firdes.low_pass(
1, samp_rate_out, 125e3, 5e3, firdes.WIN_HAMMING, 6.76))
self.gsm_clock_offset_corrector_tagged_0 = grgsm.clock_offset_corrector_tagged(
fc=fc,
ppm=ppm,
samp_rate_in=samp_rate_in,
)
self.fractional_resampler_xx_0 = filter.fractional_resampler_cc(0, samp_rate_in/samp_rate_out)
##################################################
# Connections
##################################################
self.connect((self.low_pass_filter_0_0, 0), (self, 0))
self.connect((self.fractional_resampler_xx_0, 0), (self.low_pass_filter_0_0, 0))
self.connect((self.gsm_clock_offset_corrector_tagged_0, 0), (self.fractional_resampler_xx_0, 0))
self.connect((self, 0), (self.gsm_clock_offset_corrector_tagged_0, 0))
##################################################
# Asynch Message Connections
##################################################
self.msg_connect((self, 'ctrl_in'), (self.gsm_clock_offset_corrector_tagged_0, 'ctrl'))
def set_fc(self, fc):
self.fc = fc
self.gsm_clock_offset_corrector_tagged_0.set_fc(self.fc)
def get_osr(self):
return self.osr
def set_osr(self, osr):
self.osr = osr
self.set_samp_rate_out(1625000.0/6.0*self.osr)
def get_ppm(self):
return self.ppm
def set_ppm(self, ppm):
self.ppm = ppm
self.gsm_clock_offset_corrector_tagged_0.set_ppm(self.ppm)
def get_samp_rate_in(self):
return self.samp_rate_in
def set_samp_rate_in(self, samp_rate_in):
self.samp_rate_in = samp_rate_in
self.gsm_clock_offset_corrector_tagged_0.set_samp_rate_in(self.samp_rate_in)
self.fractional_resampler_xx_0.set_resamp_ratio(self.samp_rate_in/self.samp_rate_out)
def get_samp_rate_out(self):
return self.samp_rate_out
def set_samp_rate_out(self, samp_rate_out):
self.samp_rate_out = samp_rate_out
self.fractional_resampler_xx_0.set_resamp_ratio(self.samp_rate_in/self.samp_rate_out)
self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.samp_rate_out, 125e3, 5e3, firdes.WIN_HAMMING, 6.76))
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