1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: Clock offset corrector
# Author: Piotr Krysik
# Generated: Wed Aug 6 15:49:59 2014
##################################################
from gnuradio import blocks
from gnuradio import filter
from gnuradio import gr
from gnuradio.filter import firdes
import gsm
import math
class clock_offset_corrector(gr.hier_block2):
def __init__(self, ppm=0, samp_rate=1625000.0/6.0*4.0, fc=936.6e6):
gr.hier_block2.__init__(
self, "Clock offset corrector",
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.samp_rate = samp_rate
self.fc = fc
##################################################
# Blocks
##################################################
self.ppm_msg = None;self.message_port_register_hier_out("ppm")
self.gsm_controlled_rotator_cc_0 = gsm.controlled_rotator_cc(0,samp_rate)
self.gsm_controlled_const_source_f_0 = gsm.controlled_const_source_f(ppm)
self.fractional_resampler_xx_0 = filter.fractional_resampler_cc(0, 1)
self.blocks_multiply_const_vxx_0_0 = blocks.multiply_const_vff((1.0/1.0e6, ))
self.blocks_multiply_const_vxx_0 = blocks.multiply_const_vff((fc/samp_rate*(2*math.pi), ))
self.blocks_add_const_vxx_0 = blocks.add_const_vff((1, ))
##################################################
# Connections
##################################################
self.connect((self.gsm_controlled_const_source_f_0, 0), (self.blocks_multiply_const_vxx_0_0, 0))
self.connect((self, 0), (self.gsm_controlled_rotator_cc_0, 0))
self.connect((self.blocks_multiply_const_vxx_0_0, 0), (self.blocks_multiply_const_vxx_0, 0))
self.connect((self.blocks_add_const_vxx_0, 0), (self.fractional_resampler_xx_0, 1))
self.connect((self.gsm_controlled_rotator_cc_0, 0), (self.fractional_resampler_xx_0, 0))
self.connect((self.blocks_multiply_const_vxx_0, 0), (self.gsm_controlled_rotator_cc_0, 1))
self.connect((self.blocks_multiply_const_vxx_0_0, 0), (self.blocks_add_const_vxx_0, 0))
self.connect((self.fractional_resampler_xx_0, 0), (self, 0))
##################################################
# Asynch Message Connections
##################################################
self.msg_connect(self, "ppm", self.gsm_controlled_const_source_f_0, "constant_msg")
def get_ppm(self):
return self.ppm
def set_ppm(self, ppm):
self.ppm = ppm
self.gsm_controlled_const_source_f_0.set_constant(self.ppm)
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.blocks_multiply_const_vxx_0.set_k((self.fc/self.samp_rate*(2*math.pi), ))
self.gsm_controlled_rotator_cc_0.set_samp_rate(self.samp_rate)
def get_fc(self):
return self.fc
def set_fc(self, fc):
self.fc = fc
self.blocks_multiply_const_vxx_0.set_k((self.fc/self.samp_rate*(2*math.pi), ))
|
