Two independent scalar radio links

[WolframStrauss]

Hi,
I would like to simulate two (scalar) radio links, each with its own frequency, bandwidth, modulation ...
I started with the Coexistence of IEEE 802.11 and 802.15.4 showcase. But switching to the scalar version, I run into an error in IsotropicScalarBackgroundNoise (<!> Background noise bandwidth doesn't match listening bandwidth -- in module (inet::physicallayer::RadioMedium) CoexistenceShowcase.radioMedium (id=3), during network initialization).
I have no problem to set all bandwidths to one value and compenstate the SNIR error in my error model. Did I miss a parameter?

Thank you. Best regards. Wolfram

My configuration/network of the coexistence show case:

[General]
network = CoexistenceShowcase
sim-time-limit = 5s
repeat = 8
# arp type
*.*Host*.ipv4.arp.typename = "GlobalArp"

[Config Dimensional]
# radio medium settings
*.radioMedium.analogModel.typename = "DimensionalAnalogModel"
*.radioMedium.backgroundNoise.typename = "IsotropicDimensionalBackgroundNoise"
*.radioMedium.backgroundNoise.powerSpectralDensity = -113dBmWpMHz

# radio settings
# 2452MHz/20MHz bw
*.wifiHost*.wlan[*].radio.channelNumber = 8
*.wifiHost*.wlan[*].radio.typename = "Ieee80211DimensionalRadio"

*.wifiHost*.wlan[*].radio.transmitter.frequencyGains = "left c-b*1.5 -40dB linear c-b -28dB linear c-b*0.5-1MHz -20dB linear c-b*0.5+1MHz 0dB linear c+b*0.5-1MHz 0dB linear c+b*0.5+1MHz -20dB linear c+b -28dB linear c+b*1.5 -40dB right"
*.wpanHost*.wlan[*].radio.transmitter.frequencyGains = "left c-5MHz -40dB linear c-2MHz -20dB linear c-1MHz 0dB either c+1MHz 0dB linear c+2MHz -20dB linear c+5MHz -40dB right"

*.*Host*.wlan[*].radio.receiver.snirThresholdMode = "mean"
*.*Host*.wlan[*].radio.receiver.errorModel.snirMode = "mean"

# default 2450MHz/2.8MHz bw
*.wpanHost*.wlan[*].typename = "Ieee802154NarrowbandInterface"
*.wpanHost*.wlan[*].radio.typename = "Ieee802154NarrowbandDimensionalRadio"

[Config Scalar]
# radio medium settings
*.radioMedium.analogModel.typename = "ScalarAnalogModel"
*.radioMedium.backgroundNoise.typename = "IsotropicScalarBackgroundNoise"
*.radioMedium.backgroundNoise.power = -143dBm
*.radioMedium.backgroundNoise.bandwidth = 20MHz

# radio settings
# 2452MHz/20MHz bw
*.wifiHost*.wlan[*].radio.channelNumber = 8
*.wifiHost*.wlan[*].radio.typename = "Ieee80211ScalarRadio"
*.wifiHost*.wlan[*].radio.bandwidth = 20MHz

# default 2450MHz/2.8MHz bw
*.wpanHost*.wlan[*].typename = "Ieee802154NarrowbandInterface"
*.wpanHost*.wlan[*].radio.typename = "Ieee802154NarrowbandScalarRadio"

[Config WifiHosts]
# wifi hosts app settings
*.wifiHost1.numApps = 1
*.wifiHost1.app[*].typename = "UdpBasicApp"
*.wifiHost1.app[*].destAddresses = "wifiHost2"
*.wifiHost1.app[*].destPort = 5000
*.wifiHost1.app[*].messageLength = 1000byte
*.wifiHost1.app[*].packetName = "UDPData-wifi"
*.wifiHost1.app[*].startTime = uniform(0.1us, 0.1s)
*.wifiHost1.app[*].sendInterval = 0.4ms

*.wifiHost2.numApps = 1
*.wifiHost2.app[*].typename = "UdpSink"
*.wifiHost2.app[*].localPort = 5000

[Config WpanHosts]
# wpan hosts app settings
*.wpanHost1.numApps = 1
*.wpanHost1.app[0].typename = "UdpBasicApp"
*.wpanHost1.app[0].destAddresses = "wpanHost2"
*.wpanHost1.app[0].destPort = 5000
*.wpanHost1.app[0].messageLength = 8byte
*.wpanHost1.app[0].packetName = "UDPData-wpan-"
*.wpanHost1.app[0].startTime = uniform(0.1us, 0.1s)
*.wpanHost1.app[0].sendInterval = 0.1s

*.wpanHost2.numApps = 1
*.wpanHost2.app[0].typename = "UdpSink"
*.wpanHost2.app[0].localPort = 5000

*.wpanHost*.wlan[*].radio.centerFrequency = 868MHz
*.wpanHost*.wlan[*].radio.bandwidth = 200kHz

[Config Coexistence]
extends = Dimensional, WifiHosts, WpanHosts

# Tried with scalar models (not yet working)
[Config CoexistenceScalar]
extends = Scalar, WifiHosts, WpanHosts
```
```terminal
package inet.showcases.wireless.coexistence;

import inet.networklayer.configurator.ipv4.Ipv4NetworkConfigurator;
import inet.node.inet.AdhocHost;
import inet.physicallayer.wireless.common.medium.RadioMedium;

network CoexistenceShowcase
{
    submodules:
        configurator: Ipv4NetworkConfigurator {
            @display("p=5,10");
        }
        radioMedium: RadioMedium {
            @display("p=5,15");
        }
        wifiHost1: AdhocHost {
            @display("p=40.791748,11.9189995;i=device/laptop");
        }
        wifiHost2: AdhocHost {
            @display("p=40.791748,31.4415;i=device/laptop");
        }
        wpanHost1: AdhocHost {
            @display("p=23.426999,21.5775;i=misc/sensor2");
        }
        wpanHost2: AdhocHost {
            @display("p=51.1695,21.5775;i=misc/sensor2");
        }
}
```

[aarizaq]

Please, include the version of inet-framework that you are using.

You will have this error with In any case, this error with IsotropicScalarBackgroundNoise if both radios don't have the same bandwidth.

I think that it is possible to use IsotropicDimensionalBackgroundNoise to avoid this problem,

For example

*.radioMedium.analogModel.typename = "ScalarMediumAnalogModel"
*.radioMedium.backgroundNoise.typename = "IsotropicDimensionalBackgroundNoise"
*.radioMedium.backgroundNoise.powerSpectralDensity = -113dBmWpMHz

But I think that in this case you need to use Dimensional radio. You are using two interfaces with different characteristics that Dimensional radio is tailored for this.

[WolframStrauss]

I am using INET-4.5.4 and omnetpp-6.2.0.

Thank you.

[levy]

If the two mediums are completely independent, you can use the scalar versions with 2 medium modules.

[WolframStrauss]

Interesting option. Thank you.

[adamgeorge309]

This might be helpful as well:
https://inet.omnetpp.org/docs/showcases/wireless/crosstalk/doc/index.html

[WolframStrauss]

Thank you. Exactly what I was looking for.