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# -*- coding: utf-8 -*-
#
# DPD Computation Engine, constants and global configuration
#
# Source for DAB standard: etsi_EN_300_401_v010401p p145
#
# http://www.opendigitalradio.org
# Licence: The MIT License, see notice at the end of this file
import numpy as np
class GlobalConfig:
def __init__(self, samplerate: int, plot_location: str):
self.sample_rate = samplerate
assert self.sample_rate == 8192000, "We only support constants for 8192000 sample rate: {}".format(self.sample_rate)
self.plot_location = plot_location
plot = len(plot_location) > 0
# DAB frame
# Time domain
oversample = int(self.sample_rate / 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.median_to_peak = 12 # Estimated value for a DAB OFDM signal
# Frequency Domain
# example: np.delete(fft[3328:4865], 768)
self.FFT_delta = 1536 # Number of carrier frequencies
self.FFT_delete = 768
self.FFT_start = 3328
self.FFT_end = 4865
# Calculate sample offset from phase rotation
# time per sample = 1 / sample_rate
# frequency per bin = 1kHz
# phase difference per sample offset = delta_t * 2 * pi * delta_freq
self.phase_offset_per_sample = 1. / self.sample_rate * 2 * np.pi * 1000
# Constants for ExtractStatistic
self.ES_end = 1.0
self.ES_n_bins = 64
self.ES_n_per_bin = 128 # Number of measurements pre bin
# Constants for Measure_Shoulder
self.MS_enable = False
self.MS_plot = plot
meas_offset = 976 # Offset from center frequency to measure shoulder [kHz]
meas_width = 100 # Size of frequency delta to measure shoulder [kHz]
shoulder_offset_edge = np.abs(meas_offset - self.FFT_delta)
self.MS_shoulder_left_start = self.FFT_start - shoulder_offset_edge - meas_width / 2
self.MS_shoulder_left_end = self.FFT_start - shoulder_offset_edge + meas_width / 2
self.MS_shoulder_right_start = self.FFT_end + shoulder_offset_edge - meas_width / 2
self.MS_shoulder_right_end = self.FFT_end + shoulder_offset_edge + meas_width / 2
self.MS_peak_start = self.FFT_start + 100 # Ignore region near edges
self.MS_peak_end = self.FFT_end - 100
self.MS_FFT_size = 8192
self.MS_averaging_size = 4 * self.MS_FFT_size
self.MS_n_averaging = 40
self.MS_n_proc = 4
# Constants for MER
self.MER_plot = plot
# Constants for Model_PM
# Set all phase offsets to zero for TX amplitude < MPM_tx_min
self.MPM_tx_min = 0.1
# Constants for RX_AGC
self.RAGC_min_rxgain = 25 # USRP B200 specific
self.RAGC_max_rxgain = 65 # USRP B200 specific
self.RAGC_rx_median_target = 0.05
# The MIT License (MIT)
#
# Copyright (c) 2017 Andreas Steger
# Copyright (c) 2018 Matthias P. Braendli
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
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