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#
# Copyright 2008 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
##################################################
# Imports
##################################################
import const_window
import common
from gnuradio import gr, blks2
from pubsub import pubsub
from constants import *
import sys
try:
from gnuradio import digital
except ImportError:
sys.stderr.write("Error: could not import gnuradio.digital, please install gr-digitial.\n")
sys.exit(1)
##################################################
# Constellation sink block (wrapper for old wxgui)
##################################################
class const_sink_c(gr.hier_block2, common.wxgui_hb):
"""
A constellation block with a gui window.
"""
def __init__(
self,
parent,
title='',
sample_rate=1,
size=const_window.DEFAULT_WIN_SIZE,
frame_rate=const_window.DEFAULT_FRAME_RATE,
const_size=const_window.DEFAULT_CONST_SIZE,
#mpsk recv params
M=4,
theta=0,
loop_bw=6.28/100.0,
fmax=0.06,
mu=0.5,
gain_mu=0.005,
symbol_rate=1,
omega_limit=0.005,
):
#init
gr.hier_block2.__init__(
self,
"const_sink",
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(0, 0, 0),
)
#blocks
sd = blks2.stream_to_vector_decimator(
item_size=gr.sizeof_gr_complex,
sample_rate=sample_rate,
vec_rate=frame_rate,
vec_len=const_size,
)
fmin = -fmax
gain_omega = .25*gain_mu**2 #redundant, will be updated
omega = 1 #set_sample_rate will update this
# Costas frequency/phase recovery loop
# Critically damped 2nd order PLL
self._costas = digital.costas_loop_cc(loop_bw, M)
# Timing recovery loop
# Critically damped 2nd order DLL
self._retime = digital.clock_recovery_mm_cc(omega,
gain_omega,
mu, gain_mu,
omega_limit)
#sync = gr.mpsk_receiver_cc(
# M, #psk order
# theta,
# alpha,
# beta,
# fmin,
# fmax,
# mu,
# gain_mu,
# omega,
# gain_omega,
# omega_limit,
#)
agc = gr.feedforward_agc_cc(16, 1)
msgq = gr.msg_queue(2)
sink = gr.message_sink(gr.sizeof_gr_complex*const_size, msgq, True)
#controller
def setter(p, k, x): p[k] = x
self.controller = pubsub()
self.controller.subscribe(LOOP_BW_KEY, self._costas.set_loop_bandwidth)
self.controller.publish(LOOP_BW_KEY, self._costas.get_loop_bandwidth)
self.controller.subscribe(GAIN_MU_KEY, self._retime.set_gain_mu)
self.controller.publish(GAIN_MU_KEY, self._retime.gain_mu)
self.controller.subscribe(OMEGA_KEY, self._retime.set_omega)
self.controller.publish(OMEGA_KEY, self._retime.omega)
self.controller.subscribe(GAIN_OMEGA_KEY, self._retime.set_gain_omega)
self.controller.publish(GAIN_OMEGA_KEY, self._retime.gain_omega)
self.controller.subscribe(SAMPLE_RATE_KEY, sd.set_sample_rate)
self.controller.subscribe(SAMPLE_RATE_KEY, lambda x: setter(self.controller, OMEGA_KEY, float(x)/symbol_rate))
self.controller.publish(SAMPLE_RATE_KEY, sd.sample_rate)
#initial update
self.controller[SAMPLE_RATE_KEY] = sample_rate
#start input watcher
common.input_watcher(msgq, self.controller, MSG_KEY)
#create window
self.win = const_window.const_window(
parent=parent,
controller=self.controller,
size=size,
title=title,
msg_key=MSG_KEY,
loop_bw_key=LOOP_BW_KEY,
gain_mu_key=GAIN_MU_KEY,
gain_omega_key=GAIN_OMEGA_KEY,
omega_key=OMEGA_KEY,
sample_rate_key=SAMPLE_RATE_KEY,
)
common.register_access_methods(self, self.win)
#connect
self.wxgui_connect(self, self._costas, self._retime, agc, sd, sink)
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