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Merged
zhengnanli merged 1 commit into from
May 22, 2025
Merged

Update replay.py #3

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6 changes: 3 additions & 3 deletions src/uwa_replay/replay.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,12 +6,12 @@

def replay(input, fs, array_index, channel, start=None):
"""
Simulate the replay of a baseband signal through an underwater acoustic channel.
Simulate the replay of a passband signal through an underwater acoustic channel.

Parameters:
-----------
input : ndarray
Complex baseband input signal.
Real passband input signal.

fs : float
Sampling frequency of the input signal in Hz.
Expand Down Expand Up @@ -69,7 +69,7 @@ def replay(input, fs, array_index, channel, start=None):
if "theta_hat" in channel.keys():
theta_hat = np.array(channel["theta_hat"])[:, array_index]

# Convert baseband and resample the signal to fs_delay
# Convert to baseband and resample the signal to fs_delay
frac = Fraction(fs_delay / fs).limit_denominator()
baseband = input * np.exp(-2j * np.pi * fc * np.arange(input.shape[0]) / fs)
baseband = sg.resample_poly(baseband, frac.numerator, frac.denominator)
Expand Down