Models Rician fading in wireless channels, which occurs when a signal reaches the receiver through both direct line-of-sight and multipath propagation. The k parameter (in dB) controls the ratio between the direct and scattered signal components, with higher values indicating stronger line-of-sight conditions. This model extends free space path loss with stochastic variations based on the Rician distribution, making it suitable for indoor and urban environments where a dominant signal path exists alongside weaker multipath components.

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends

Name	Type	Description
FreeSpacePathLoss	compound module	Implements the free space path loss model, which models signal attenuation over distance according to the Friis transmission equation. Calculates signal power loss as a function of distance, wavelength, and configurable parameters. The alpha parameter controls the path loss exponent (default 2), while the systemLoss parameter accounts for hardware inefficiencies. Provides an ideal baseline model for wireless propagation in environments with line-of-sight and no obstacles.

Parameters

Name	Type	Default value	Description
displayStringTextFormat	string	""	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
alpha	double	2
systemLoss	double	0dB
k	double	8dB

Properties

Name	Value	Description
class	RicianFading
display	i=block/control

Source code

//
// Models Rician fading in wireless channels, which occurs when a signal reaches
// the receiver through both direct line-of-sight and multipath propagation. The
// k parameter (in dB) controls the ratio between the direct and scattered signal
// components, with higher values indicating stronger line-of-sight conditions.
// This model extends free space path loss with stochastic variations based on
// the Rician distribution, making it suitable for indoor and urban environments
// where a dominant signal path exists alongside weaker multipath components.
//
module RicianFading extends FreeSpacePathLoss
{
    parameters:
        double k @unit(dB) = default(8dB);
        @class(RicianFading);
}

File: src/inet/physicallayer/wireless/common/pathloss/RicianFading.ned

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