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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: Thu Nov 6 14:41:06 2014
##################################################
from gnuradio import filter
from gnuradio import gr
from gnuradio.filter import firdes
import gsm
class gsm_input(gr.hier_block2):
def __init__(self, ppm=0, osr=4, fc=940e6, 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),
)
##################################################
# Parameters
##################################################
self.ppm = ppm
self.osr = osr
self.fc = fc
self.samp_rate_in = samp_rate_in
##################################################
# Blocks
##################################################
self.ppm_in = None;self.message_port_register_hier_out("ppm_in")
self.low_pass_filter_0_0 = filter.fir_filter_ccf(1, firdes.low_pass(
1, 1625000.0/6.0*osr, 125e3, 5e3, firdes.WIN_HAMMING, 6.76))
self.gsm_clock_offset_corrector_0 = gsm.clock_offset_corrector(
fc=fc,
ppm=0,
samp_rate_in=samp_rate_in,
samp_rate_out=1625000.0/6.0*4.0,
)
##################################################
# Connections
##################################################
self.connect((self.low_pass_filter_0_0, 0), (self, 0))
self.connect((self.gsm_clock_offset_corrector_0, 0), (self.low_pass_filter_0_0, 0))
self.connect((self, 0), (self.gsm_clock_offset_corrector_0, 0))
##################################################
# Asynch Message Connections
##################################################
self.msg_connect(self, "ppm_in", self.gsm_clock_offset_corrector_0, "ppm_in")
def get_ppm(self):
return self.ppm
def set_ppm(self, ppm):
self.ppm = ppm
def get_osr(self):
return self.osr
def set_osr(self, osr):
self.osr = osr
self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, 1625000.0/6.0*self.osr, 125e3, 5e3, firdes.WIN_HAMMING, 6.76))
def get_fc(self):
return self.fc
def set_fc(self, fc):
self.fc = fc
self.gsm_clock_offset_corrector_0.set_fc(self.fc)
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_0.set_samp_rate_in(self.samp_rate_in)
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