Quick question: wireless transmission

[Alex Berger]

Hi there,

I have a quick question that drives me crazy. Any hint would be greatly appreciated.

I want to simulate some wireless propagation. but it seems the signal degradation does not work properly.
For the propagation loss, I have a alpha value of 2 (see below). If I change it to any other value, e.g. 10, it does not change anything.
The transmission range stays the same and the data rate as well. The only value that affects it is if I change the transmitterPower.
What am I missing? Do I need to define a special "channel" to make the pathloss work?

I have a wireless node and want to model the wireless transmission. My network has the following modules:
*********************************************
hosts[numHosts]:  WirelessHost (from inet.nodes.inet.WirelessHost.ned).
channelControl: ChannelControl
configurator: IPv4NetworkConfigurator
*********************************************

in my omnetpp.ini file, I have the following:
*********************************************
*.channelControl.carrierFrequency = 2.4GHz
*.channelControl.pMax = 2.0mW
*.channelControl.sat = -110dBm
*.channelControl.alpha = 2
*.channelControl.numChannels = 1

**.radio.transmitterPower = 2.0mW
**.radio.carrierFrequency = 2.4GHz
**.radio.thermalNoise = -110dBm
**.radio.sensitivity = -85dBm
**.radio.pathLossAlpha = 2
**.radio.snirThreshold = 4dB
*********************************************

Could anybody give me a hint? Any help would be appreciated.

Thanks,
Alex

[Alfonso Ariza Quintana]

Are you speaking about the radio that is draw in the IDE?

 

The propagation model uses the pathLossalpha parameter but the parameter alpha is used to computed the radio of the circles.

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[Alex Berger]

Thanks for clarifying the difference... I was actually changing it always for both of them yesterday.

However, after restarting my computer and the IDE today, it works as expected. Strange!
So, I guess this is solved. Thanks!