channel noise

[adib rastegarnia]

Dear All
Is there any parameter which I can change the noise of channel ?
Thanks

[Thanassis Boulis]

I am not certain what you mean by noise of the channel.

Probably you mean the thermal noise, that establishes the noise floor of the channel.

If so, then the parameter noiseFloor inside the Radio parameters file is your parameter to change. 

 Yes it depends on the Radio and the mode the radio operates in (not the wireless channel) 

Note this is not a omnet parameter (defined in an .ini file). It is parsed from the specially formatted RadioParameterFile.

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[adib rastegarnia]

Thanks Dr Boulis
I want to calculate BER or FER vs SNR for BAN channel which is used in Castalia simulator. So I need to change a parameter which has effects on number of errors.
What is your suggestion ? How can I simulate BER in Castalia without use of closed form formula. 

[Thanassis Boulis]

Adib, please do not send me email to my personal address. I do not reply to those.

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Thanks Dr Boulis
I want to calculate frame error rate vs avg SNR. So I need to change a parameter which affect on the number of errors ( Channel Errors ). What is your suggestion for calculating frame error rate or bit error rate for BAN channel by Castalia ( without use of closed form formula). 

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The BER vs SNR curve/function is dependent on the modulation scheme and other parameters of the radio, not the channel. The user manual explains this and there is a lot of general online material. Also studying the Castalia Radio code  (that gives you BER from SNR) gives you an idea on how this is done, and what parameters affect it. You can even define your own custom BER SNR function in Castalia.

[adib rastegarnia]

BER-SNR curves for different channels are not same. I mean that for BAN channel BER-SNR curve should be different when we compared for example AWGN channel.

On Wednesday, May 15, 2013 6:09:30 PM UTC+4:30, adib rastegarnia wrote:

[Thanassis Boulis]

Can you explain this more?

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[adib rastegarnia]

I mean that formula which are used for BER calculation is valid for an AWGN channel not for the BAN channel. I need to calculate the BER vs avg SNR for BAN  channel. BER vs avg SNR curves for different channel are not similar to each other. As I understood an algorithm is used to calculate the number of bit errors based on BER formulas. I don't know my description is enough or not.

On Wednesday, May 15, 2013 6:09:30 PM UTC+4:30, adib rastegarnia wrote:

[Thanassis Boulis]

I do not know much about the lower level physical stuff, but we have been using the standard BER-SNR curves for BAN channels as well, focusing more on the temporal variations that these channels exhibit. The research of my colleagues that do know much more about physical layer than me, shows that this is the important aspect.

If you have a different model for a BAN channel (I am curious to find out what you mean exactly) then you'll have to implement it yourself.

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