| #!/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) |
| |