Apply free space path loss to complex signal
Communications Toolbox / RF Impairments
The Free Space Path Loss block applies a free space path loss to a complex signal. The block simulates the loss of signal power due to the distance between the transmitter and receiver. The Mode parameter indicates whether you specify the loss in decibels or as a computation that is based on distance and the RF signal frequency.
Data Types |
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Multidimensional Signals |
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Variable-Size Signals |
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The free-space path loss, L, in decibels is:
L = 20log10(4πR/λ).
This formula assumes that the target is in the far-field of the transmitting element or array. In the near-field, the free-space path loss formula is not valid and can result in a loss smaller than 0 dB, equivalent to a signal gain. For this reason, the loss is set to 0 dB for range values R ≤ λ/4π.