transmission range and Interference Range in INETMANET:

[Tahir]

Hi Omnet users,
I have a question regarding transmission
range and interference range in INETMANET.
In Channel Control, the interference distance is calculated as mentioned below,

interference distance = pow(waveLength * waveLength * pMax /
(16.0 * M_PI * M_PI * minReceivePower), 1.0 /
alpha)

My question is that how can I calculate the transmission range.....I
mean I want to understand the difference between transmission range
and interference range.

regards,

Tahir

[Greg81]

Dear Tahir,

the transmission range is determined by the sensitivity of your
receiver, the received power and the signal-to-noise ratio threshold
(snirThreshold) as well as the bit-error-ratio of the channel and the
transmission speed (11Mbps, 54Mbps) of your radio.

I have estimated the "transmission" range experimentally using 2 nodes
for my particular scenario. With an 802.11g MAC (54Mbps), 2mW
transmission power and -85dBm receiver sensitivity and 4dB SNIR-
Threshold, my nodes are able to transmit close to 100% of the packets
at a distance of 65 meters. Distances greater than 120 meters lead to
a loss of all packets.

Does this help you get started? I am sure that there is a close-form
solution to calculate the theoretical distance, but I do not know
this.

Cheers,

Greg

[Tahir]

Many thanks Greg for the reply,
In fact, I am simulating a cellular network, where I am using the
concept of frequency reuse. someone told me that Interference
distances are much much larger than transmission ranges(may be factor
of 10), so my frequency reuse distances were really smaller, because
small interferences can accumulate and can corrupt the complete
signal. So, now I am trying to model these two different concepts in
the simulation, so that frequency reuse distances could be properly
designed.

regards,

Tahir

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[Greg81]

Dear Tahir,

from what I know, Omnet/ inetmanet models the interference and
transmission range correctly. I guess you are looking for a way to
predict the spacing that you will need between two (or more)
transmitters in order to reuse the spectrum most efficiently?

From my limited knowledge in this area, I guess I would:
1. figure out whether signals at different frequencies contribute to
the noise floor (i.e. do you have to worry about interference from
stations that transmit using a different frequency)
2. select a "worst case" point, i.e. where most signals will overlap
3. compute the noise-floor based on the "unwanted" transmissions
received
4. generate a level chart/ gradient/ vector field that will help you
figure out the expected transmission distance (since this depends on
the power of other singals as well as on the power of the desired
signal).

I hope this helps you get started...

Greg

[Sh Asaadi]

Hi Greg,

Can you please explain how you computed this value?

In my case, the sensitivity is -90dBm and other parameters are the same, and I need to get the transmission range in meters

Thanks,

Shima

[Alfonso Ariza Quintana]

http://www.wirelesscommunication.nl/reference/chaptr03/fsl.htm

 

You can compute the sensitivity for a distance if you know the transmission power

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