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# -*- coding: utf-8 -*-
##################################################
# GNU Radio Python Flow Graph
# Title: GMSK Modulator for GSM
# Author: Piotr Krysik
# Description: GMSK Modulator for GSM
# Generated: Wed Sep 20 21:12:04 2017
##################################################
from gnuradio import blocks
from gnuradio import digital
from gnuradio import gr
from gnuradio.analog import cpm
from gnuradio.filter import firdes
import grgsm
class gsm_gmsk_mod(grgsm.hier_block):
def __init__(self, BT=4, pulse_duration=4, sps=4):
gr.hier_block2.__init__(
self, "GMSK Modulator for GSM",
gr.io_signature(1, 1, gr.sizeof_char*1),
gr.io_signature(1, 1, gr.sizeof_gr_complex*1),
)
##################################################
# Parameters
##################################################
self.BT = BT
self.pulse_duration = pulse_duration
self.sps = sps
##################################################
# Blocks
##################################################
self.digital_gmskmod_bc_0 = digital.gmskmod_bc(sps, pulse_duration, BT)
self.digital_diff_decoder_bb_0 = digital.diff_decoder_bb(2)
self.digital_chunks_to_symbols_xx_0 = digital.chunks_to_symbols_bf(([1,-1]), 1)
self.blocks_tagged_stream_multiply_length_0 = blocks.tagged_stream_multiply_length(gr.sizeof_gr_complex*1, "packet_len", sps)
self.blocks_float_to_char_0 = blocks.float_to_char(1, 1)
##################################################
# Connections
##################################################
self.connect((self.blocks_float_to_char_0, 0), (self.digital_gmskmod_bc_0, 0))
self.connect((self.blocks_tagged_stream_multiply_length_0, 0), (self, 0))
self.connect((self.digital_chunks_to_symbols_xx_0, 0), (self.blocks_float_to_char_0, 0))
self.connect((self.digital_diff_decoder_bb_0, 0), (self.digital_chunks_to_symbols_xx_0, 0))
self.connect((self.digital_gmskmod_bc_0, 0), (self.blocks_tagged_stream_multiply_length_0, 0))
self.connect((self, 0), (self.digital_diff_decoder_bb_0, 0))
def get_BT(self):
return self.BT
def set_BT(self, BT):
self.BT = BT
def get_pulse_duration(self):
return self.pulse_duration
def set_pulse_duration(self, pulse_duration):
self.pulse_duration = pulse_duration
def get_sps(self):
return self.sps
def set_sps(self, sps):
self.sps = sps
self.blocks_tagged_stream_multiply_length_0.set_scalar(self.sps)
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