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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# @file
# @author Piotr Krysik <ptrkrysik@gmail.com>
# @section LICENSE
#
# Gr-gsm is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# Gr-gsm is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with gr-gsm; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
##################################################
# GNU Radio 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: Sun Jul 17 17:36:46 2016
##################################################
from gnuradio import filter
from gnuradio import gr
from gnuradio.filter import firdes
import grgsm
class gsm_input(grgsm.hier_block):
def __init__(self, fc=940e6, osr=4, ppm=0, samp_rate_in=1e6):
gr.hier_block2.__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),
)
self.message_port_register_hier_in("ctrl_in")
##################################################
# Parameters
##################################################
self.fc = fc
self.osr = osr
self.ppm = ppm
self.samp_rate_in = samp_rate_in
##################################################
# Variables
##################################################
self.gsm_symb_rate = gsm_symb_rate = 1625000.0/6.0
self.samp_rate_out = samp_rate_out = gsm_symb_rate*osr
##################################################
# Blocks
##################################################
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,
samp_rate_in=samp_rate_in,
ppm=ppm,
osr=osr,
)
##################################################
# Connections
##################################################
self.msg_connect((self, 'ctrl_in'), (self.gsm_clock_offset_corrector_tagged_0, 'ctrl'))
self.connect((self.gsm_clock_offset_corrector_tagged_0, 0), (self.low_pass_filter_0_0, 0))
self.connect((self.low_pass_filter_0_0, 0), (self, 0))
self.connect((self, 0), (self.gsm_clock_offset_corrector_tagged_0, 0))
def get_fc(self):
return self.fc
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(self.gsm_symb_rate*self.osr)
self.gsm_clock_offset_corrector_tagged_0.set_osr(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)
def get_gsm_symb_rate(self):
return self.gsm_symb_rate
def set_gsm_symb_rate(self, gsm_symb_rate):
self.gsm_symb_rate = gsm_symb_rate
self.set_samp_rate_out(self.gsm_symb_rate*self.osr)
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.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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