qampy.core.impairments

Functions for the simulation of transmission and transceiver impairments.

Functions

H_PMD(theta, t_dgd, omega)	Calculate the response for PMD applied to the signal (see e.g.
add_awgn(sig, strgth)	Add additive white Gaussian noise to a signal.
add_carrier_offset(sig, fo, fs)	Add frequency offset to signal
add_dispersion(sig, fs, D, L[, wl0])	Add dispersion to signal.
add_modal_delay(sig, delay)	Add a modal delay of n-symbols to modes of signal, e.g.
apply_DAC_filter(sig, fs[, cutoff, fn, ch])	Apply the frequency response filter of the DAC.
apply_PMD_to_field(field, theta, t_dgd, fs)	Apply PMD to a given input field
apply_enob_as_awgn(sig, enob[, verbose])	Add noise from limited ENOB as modelled as AWGN to signal.
apply_phase_noise(signal, df, fs)	Add phase noise from local oscillators, based on a Wiener noise process.
change_snr(sig, snr, fb, fs)	Change the SNR of a signal assuming that the input signal is noiseless
clipper(sig, clipping_level)	Clip signal to the range (-clipping_level, clipping_level).
er_to_g(ext_rat)	param ext_rat:
filter_signal(signal, fs, cutoff[, ftype, ...])	Apply an analog filter to a signal for simulating e.g.
ideal_amplifier_response(sig, out_volt)	Simulate a ideal amplifier, which just scale RF signal to out_volt.
load_dac_response(fn, fs, N[, ch])	Load the measured dac response and adjust it to target sampling frequency.
modulator_response(rfsig[, dcbias, gfactr, ...])	Function so simulate IQ modulator response.
normalise_and_center(E)	Normalise and center the input field, by calculating the mean power for each polarisation separate and dividing by its square-root
phase_noise(sz, df, fs)	Calculate phase noise from local oscillators, based on a Wiener noise process with a variance given by \(\sigma^2=2\pi df/fs\)
quantize_signal(sig[, nbits, rescale, ...])	Function so simulate limited resultion using DACs and ADCs
quantize_signal_New(sig_in[, nbits, ...])	Function so simulate limited resultion using DACs and ADCs, limit quantization error to (-delta/2,delta/2) and set
rescale_signal(E[, swing])	Rescale the (1-pol) signal to (-swing, swing).
rotate_field(field, theta)	Rotate a dual polarisation field by the given angle
sim_DAC_response(sig, fs[, enob, clip_rat, ...])	Function to simulate DAC response, including quantization noise (ENOB) and frequency response.
sim_tx_response(sig, fs[, enob, tgt_v, ...])	Simulate a realistic transmitter possibly including quantization, noise due to limited ENOB, and DAC frequency response
simulate_transmission(sig, fb, fs[, snr, ...])	Convenience function to simulate impairments on signal at once