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# -*- coding: utf-8 -*-
#
# DPD Calculation Engine, constants
#
# 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 Const:
def __init__(self, sample_rate, target_median, plot):
assert sample_rate == 8192000 # By now only constants for 8192000
self.sample_rate = sample_rate
# DAB frame
# Time domain
self.T_F = sample_rate / 2048000 * 196608 # Transmission frame duration
self.T_NULL = sample_rate / 2048000 * 2656 # Null symbol duration
self.T_S = sample_rate / 2048000 * 2552 # Duration of OFDM symbols of indices l = 1, 2, 3,... L;
self.T_U = sample_rate / 2048000 * 2048 # Inverse of carrier spacing
self.T_C = sample_rate / 2048000 * 504 # Duration of cyclic prefix
# 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. / sample_rate * 2 * np.pi * 1000
# Constants for ExtractStatistic
self.ES_plot = plot
self.ES_start = 0.0
self.ES_end = 1.0
self.ES_n_bins = 64 # Number of bins between ES_start and ES_end
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
self.MDL_plot = True or plot # Override default
# Constants for Model_PM
# Set all phase offsets to zero for TX amplitude < MPM_tx_min
self.MPM_tx_min = 0.1
# Constants for TX_Agc
self.TAGC_max_txgain = 89 # USRP specific
self.TAGC_tx_median_target = target_median
self.TAGC_tx_median_max = self.TAGC_tx_median_target * 1.4
self.TAGC_tx_median_min = self.TAGC_tx_median_target / 1.4
# Constants for RX_AGC
self.RAGC_min_rxgain = 25 # USRP specific
self.RAGC_rx_median_target = self.TAGC_tx_median_target
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