Paths with zero amplitude and zero phase. about sionna

[abrxao]

My scene has two transmitters and four receivers. This error is messing me up, cause when i convert the amplitude to dB scale using np.log10(tf.abs(a).numpy()) compiler throw me a warning. "RuntimeWarning: divide by zero encountered in log10: print( 20*np.log10(tf.abs(ampli_s[i][0,0,1,0].numpy())))"

This only occurs when i have multyple receivers.

[SebastianCa]

Hi @abrxao,

The Path.CIR function uses zero-padding (or cropping) to maintain constant tensor dimensions. This zero-padding can result in zero values within your amplitude tensor, which causes the RuntimeWarning: divide by zero encountered in log10 when you attempt to convert these values to the dB scale using np.log10.

To address this, you can add a small offset to the amplitude values before converting them to dB to avoid taking the log of zero.

[abrxao]

Hi @abrxao,

The Path.CIR function uses zero-padding (or cropping) to maintain constant tensor dimensions. This zero-padding can result in zero values within your amplitude tensor, which causes the RuntimeWarning: divide by zero encountered in log10 when you attempt to convert these values to the dB scale using np.log10.

To address this, you can add a small offset to the amplitude values before converting them to dB to avoid taking the log of zero.

Thank you!