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# -*- coding: utf-8 -*-
#
# DPD Computation Engine module
#
# Copyright (c) 2017 Andreas Steger
# Copyright (c) 2018 Matthias P. Braendli
#
# http://www.opendigitalradio.org
#
# This file is part of ODR-DabMod.
#
# ODR-DabMod 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 of the
# License, or (at your option) any later version.
#
# ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
from . import Capture
class DPD:
def __init__(self, samplerate=8192000):
self.samplerate = samplerate
oversample = int(self.samplerate / 2048000)
self.T_F = oversample * 196608 # Transmission frame duration
self.T_NULL = oversample * 2656 # Null symbol duration
self.T_S = oversample * 2552 # Duration of OFDM symbols of indices l = 1, 2, 3,... L;
self.T_U = oversample * 2048 # Inverse of carrier spacing
self.T_C = oversample * 504 # Duration of cyclic prefix
self.last_capture_info = {}
port = 50055
samples_to_capture = 81920
self.capture = Capture.Capture(self.samplerate, port, samples_to_capture)
def status(self):
r = {}
r['histogram'] = self.capture.bin_histogram()
r['capture'] = self.last_capture_info
return r
def capture_samples(self):
"""Captures samples and store them in the accumulated samples,
returns a string with some info"""
try:
txframe_aligned, tx_ts, tx_median, rxframe_aligned, rx_ts, rx_median = self.capture.get_samples()
self.last_capture_info['length'] = len(txframe_aligned)
self.last_capture_info['tx_median'] = tx_median
self.last_capture_info['rx_median'] = rx_median
self.last_capture_info['tx_ts'] = tx_ts
self.last_capture_info['rx_ts'] = rx_ts
return "Captured {} samples, tx median {}, rx median {}".format(len(txframe_aligned, tx_median, rx_median))
except ValueError as e:
return "Error: {}".format(e)
# tx, rx, phase_diff, n_per_bin = extStat.extract(txframe_aligned, rxframe_aligned)
# off = SA.calc_offset(txframe_aligned)
# print("off {}".format(off))
# tx_mer = MER.calc_mer(txframe_aligned[off:off + c.T_U], debug_name='TX')
# print("tx_mer {}".format(tx_mer))
# rx_mer = MER.calc_mer(rxframe_aligned[off:off + c.T_U], debug_name='RX')
# print("rx_mer {}".format(rx_mer))
# mse = np.mean(np.abs((txframe_aligned - rxframe_aligned) ** 2))
# print("mse {}".format(mse))
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