ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 1 | #!/usr/bin/env python |
| 2 | ################################################## |
| 3 | # Gnuradio Python Flow Graph |
| 4 | # Title: GSM input adaptor |
| 5 | # Author: Piotr Krysik |
| 6 | # 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. |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 7 | # Generated: Wed Nov 19 08:23:52 2014 |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 8 | ################################################## |
| 9 | |
| 10 | from gnuradio import filter |
| 11 | from gnuradio import gr |
| 12 | from gnuradio.filter import firdes |
ptrkrysik | 3be74a7 | 2014-12-13 10:11:00 +0100 | [diff] [blame] | 13 | import grgsm |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 14 | |
| 15 | class gsm_input(gr.hier_block2): |
| 16 | |
| 17 | def __init__(self, ppm=0, osr=4, fc=940e6, samp_rate_in=1e6): |
| 18 | gr.hier_block2.__init__( |
| 19 | self, "GSM input adaptor", |
| 20 | gr.io_signature(1, 1, gr.sizeof_gr_complex*1), |
| 21 | gr.io_signature(1, 1, gr.sizeof_gr_complex*1), |
| 22 | ) |
| 23 | |
| 24 | ################################################## |
| 25 | # Parameters |
| 26 | ################################################## |
| 27 | self.ppm = ppm |
| 28 | self.osr = osr |
| 29 | self.fc = fc |
| 30 | self.samp_rate_in = samp_rate_in |
| 31 | |
| 32 | ################################################## |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 33 | # Variables |
| 34 | ################################################## |
| 35 | self.samp_rate_out = samp_rate_out = 1625000.0/6.0*osr |
| 36 | |
| 37 | ################################################## |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 38 | # Blocks |
| 39 | ################################################## |
| 40 | self.ppm_in = None;self.message_port_register_hier_out("ppm_in") |
| 41 | self.low_pass_filter_0_0 = filter.fir_filter_ccf(1, firdes.low_pass( |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 42 | 1, samp_rate_out, 125e3, 5e3, firdes.WIN_HAMMING, 6.76)) |
ptrkrysik | 3be74a7 | 2014-12-13 10:11:00 +0100 | [diff] [blame] | 43 | self.gsm_clock_offset_corrector_0 = grgsm.clock_offset_corrector( |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 44 | fc=936.6e6, |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 45 | ppm=0, |
| 46 | samp_rate_in=samp_rate_in, |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 47 | ) |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 48 | self.fractional_resampler_xx_0 = filter.fractional_resampler_cc(0, samp_rate_in/samp_rate_out) |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 49 | |
| 50 | ################################################## |
| 51 | # Connections |
| 52 | ################################################## |
| 53 | self.connect((self.low_pass_filter_0_0, 0), (self, 0)) |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 54 | self.connect((self.fractional_resampler_xx_0, 0), (self.low_pass_filter_0_0, 0)) |
| 55 | self.connect((self.gsm_clock_offset_corrector_0, 0), (self.fractional_resampler_xx_0, 0)) |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 56 | self.connect((self, 0), (self.gsm_clock_offset_corrector_0, 0)) |
| 57 | |
| 58 | ################################################## |
| 59 | # Asynch Message Connections |
| 60 | ################################################## |
| 61 | self.msg_connect(self, "ppm_in", self.gsm_clock_offset_corrector_0, "ppm_in") |
| 62 | |
| 63 | |
| 64 | def get_ppm(self): |
| 65 | return self.ppm |
| 66 | |
| 67 | def set_ppm(self, ppm): |
| 68 | self.ppm = ppm |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 69 | self.gsm_clock_offset_corrector_0.set_ppm(self.ppm) |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 70 | |
| 71 | def get_osr(self): |
| 72 | return self.osr |
| 73 | |
| 74 | def set_osr(self, osr): |
| 75 | self.osr = osr |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 76 | self.set_samp_rate_out(1625000.0/6.0*self.osr) |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 77 | |
| 78 | def get_fc(self): |
| 79 | return self.fc |
| 80 | |
| 81 | def set_fc(self, fc): |
| 82 | self.fc = fc |
| 83 | self.gsm_clock_offset_corrector_0.set_fc(self.fc) |
| 84 | |
| 85 | def get_samp_rate_in(self): |
| 86 | return self.samp_rate_in |
| 87 | |
| 88 | def set_samp_rate_in(self, samp_rate_in): |
| 89 | self.samp_rate_in = samp_rate_in |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 90 | self.fractional_resampler_xx_0.set_resamp_ratio(self.samp_rate_in/self.samp_rate_out) |
ptrkrysik | dac3b2a | 2014-11-06 14:47:33 +0100 | [diff] [blame] | 91 | self.gsm_clock_offset_corrector_0.set_samp_rate_in(self.samp_rate_in) |
| 92 | |
ptrkrysik | 381253a | 2014-11-19 11:30:53 +0100 | [diff] [blame] | 93 | def get_samp_rate_out(self): |
| 94 | return self.samp_rate_out |
| 95 | |
| 96 | def set_samp_rate_out(self, samp_rate_out): |
| 97 | self.samp_rate_out = samp_rate_out |
| 98 | self.low_pass_filter_0_0.set_taps(firdes.low_pass(1, self.samp_rate_out, 125e3, 5e3, firdes.WIN_HAMMING, 6.76)) |
| 99 | self.fractional_resampler_xx_0.set_resamp_ratio(self.samp_rate_in/self.samp_rate_out) |
| 100 | |