qampy.helpers

Convenient helper functions

Functions

cabssquared(x)	Calculate the absolute squared of a complex number
dB2lin(x)	Convert input from dB(m) units to linear units
dump_edges(E, N)	Remove N samples from the front and end of the input field.
find_pilot_idx([nframe, frame_len, os_rate, ...])	find pilot index for object with both pilot sequence (at the beginning) and phase pilot.
get_center_shift_fac(E)	Obtain shift factor (x_shift, y_shift) that is used to center the signal.
lin2dB(x)	Convert input from linear units to dB(m)
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
normalise_and_center_pil(sig, idx_pil)	Normalise and center the input field only based on pilot symbols, by calculating the mean power for each polarisation separate and dividing by its square-root
rescale_signal(E[, swing])	Rescale the (1-pol) signal to (-swing, swing).
set_mid_and_resale(E[, mid_pos, swing])	Change (1-pol) signal mid-position to given value and rescale the real signal to (-swing, swing).
set_mid_point(E[, mid_pos])	Move the (1-pol) signal's mid-position to given value