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mapping: allow demapping infinite/high SNR symbols #327

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Apr 23, 2024
Merged

mapping: allow demapping infinite/high SNR symbols #327

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4 changes: 4 additions & 0 deletions sionna/mapping.py
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Original file line number Diff line number Diff line change
Expand Up @@ -980,6 +980,8 @@ def __init__(self,
dtype.real_dtype,
**kwargs)

self._no_threshold = tf.cast(np.finfo(dtype.as_numpy_dtype).tiny, dtype.real_dtype)

@property
def constellation(self):
return self._constellation
Expand All @@ -1001,6 +1003,8 @@ def call(self, inputs):
# Add a dummy dimension for broadcasting. This is not needed when no
# is a scalar, but also does not do any harm.
no = tf.expand_dims(no, axis=-1)
# Deal with zero or very small values.
no = tf.math.maximum(no, self._no_threshold)

# Compute exponents
exponents = -squared_dist/no
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