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44 lines
928 B
Python
44 lines
928 B
Python
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# Authors: Veeresh Taranalli <veeresht@gmail.com>
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# License: BSD 3-Clause
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"""
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============================================
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Impairments (:mod:`commpy.impairments`)
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============================================
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.. autosummary::
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:toctree: generated/
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add_frequency_offset -- Add frequency offset impairment.
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"""
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from numpy import exp, pi, arange
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__all__ = ['add_frequency_offset']
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def add_frequency_offset(waveform, Fs, delta_f):
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"""
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Add frequency offset impairment to input signal.
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Parameters
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----------
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waveform : 1D ndarray of floats
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Input signal.
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Fs : float
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Sampling frequency (in Hz).
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delta_f : float
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Frequency offset (in Hz).
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Returns
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-------
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output_waveform : 1D ndarray of floats
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Output signal with frequency offset.
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"""
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output_waveform = waveform*exp(1j*2*pi*(delta_f/Fs)*arange(len(waveform)))
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return output_waveform
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