Calculation of the Transmission Range In ieee 802.11g

[Faranak Moayeri]

Hello Everyone,

I want to calculate transmission range of wireless node in order to
find the best position for them.

based on previous posts :

http://groups.google.com/group/omnetpp/browse_thread/thread/c38f3bb37793f153/09959a2845bd2469?lnk=gst&q=how+to+calvulate+wireless+range#09959a2845bd2469

I found out its the related formula for calculating the received
power :


double SnrEval::calcRcvdPower(double pSend, double distance)
{
double speedOfLight = 300000000.0;
double waveLength = speedOfLight / carrierFrequency;
return (pSend * waveLength * waveLength / (16 * M_PI * M_PI *
pow(distance, pathLossAlpha)));
}

My question is what is pSend and M_PI and can we calculate the
distance ?

How can we calculate the transmission range?

Thank you in advance

[Faranak Moayeri]

double pSend; // Power with which this packet is transmitted


#ifndef M_PI

#define M_PI 3.14

#endif

Still i am confused, how can i calculate the transmission range
formula !!

[Alfonso Ariza Quintana]

M_Pi is 3.1415926535897932384626433832
and pSend is the power in watts

-----Mensaje original-----
From: Faranak Moayeri
Sent: Wednesday, October 12, 2011 7:32 PM
To: omnetpp
Subject: [Omnetpp-l] Calculation of the Transmission Range In ieee 802.11g

Hello Everyone,

based on previous posts :

http://groups.google.com/group/omnetpp/browse_thread/thread/c38f3bb37793f153/09959a2845bd2469?lnk=gst&q=how+to+calvulate+wireless+range#09959a2845bd2469

Thank you in advance

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[Alfonso Ariza Quintana]

You can find information about this in
http://en.wikipedia.org/wiki/Free-space_path_loss

-----Mensaje original-----
From: Faranak Moayeri

Sent: Thursday, October 13, 2011 11:03 AM
To: omnetpp
Subject: [Omnetpp-l] Re: Calculation of the Transmission Range In ieee
802.11g

double pSend; // Power with which this packet is transmitted

#ifndef M_PI

#define M_PI 3.14

#endif

--

[Faranak Moayeri]

Dear Alfonoso, THank you for your replay

Sorry i got confused.

you said in the previous post that


Atenuation(dB) = 20 log( d ) + 20 log ( f ) + 32.45

and The packet is received if

(Transmission power in dBm) - (Attenuation in dB) > (sensibility in
dBm)

you mean that first i have to find the Attenuation from the above
formula and then by putting it into the following formula , i can find
the distance


Atenuation(dB) = 20 log( d ) + 20 log ( f ) + 32.45

Am i right ? sorry for asking silly question :(

Best Regards,
Faranak

[lalit kumar]

hey plz tell me where i have to code to broadcast a message in mixim
example analog model

[Faranak Moayeri]

And another question is, can i calculate the distance by using this
formula from PathLossReceptionModel::calculateReceivedPower

REceived power = pSend * waveLength * waveLength / (16 * M_PI * M_PI *
pow(distance, pathLossAlpha));

I mean, instead of received power, i put sensitivity and them
calculate distance ?
Am i right ?

i know i can calculate wavelength like this

double waveLength = speedOfLight / carrierFrequency;

What is the unit of carrierFrequency and pSend and received power and
distance in the above formula ,

Thank you in advance

regards,

Faranak

[Alfonso Ariza Quintana]

Yes, distance limit is when the received power is the same that the
sensibility.

-----Mensaje original-----
From: Faranak Moayeri

Sent: Thursday, October 13, 2011 2:26 PM

To: omnetpp
Subject: [Omnetpp-l] Re: Calculation of the Transmission Range In ieee
802.11g

And another question is, can i calculate the distance by using this
formula from PathLossReceptionModel::calculateReceivedPower

Thank you in advance

regards,

Faranak

[Faranak Moayeri]

Thank you dear Alfonoso for your reply,

My other question was What is the unit of carrierFrequency (Mhz or
HZ)and pSend (Mw or W or dBm )and received power and
distance (Km or M )in the following formula

REceived power = pSend * waveLength * waveLength / (16 * M_PI * M_PI
*
pow(distance, pathLossAlpha));

THank you for in advance ,

[Alfonso Ariza Quintana]

In this expresion Hz, Watt, meters.

-----Mensaje original-----
From: Faranak Moayeri

Sent: Thursday, October 13, 2011 9:01 PM

To: omnetpp
Subject: [Omnetpp-l] Re: Calculation of the Transmission Range In ieee
802.11g

Thank you dear Alfonoso for your reply,

--

[Faranak Moayeri]

Thank you very much dear Alfonoso for your prompt reply .

And another question, sorry for bothering you by asking lots of
questions,

which of the aforementioned formulas is better for calculating
transmission distance ?

(Transmission power in dBm) - (Attenuation in dB) > (sensibility in
dBm)

Or

REceived power = pSend * waveLength * waveLength / (16 * M_PI * M_PI *
pow(distance, pathLossAlpha));

Thank you in advance

[Alfonso Ariza Quintana]

for the computer the second, for human analisis, the first, it's easier

-----Mensaje original-----
From: Faranak Moayeri

Sent: Friday, October 14, 2011 10:10 AM

To: omnetpp
Subject: [Omnetpp-l] Re: Calculation of the Transmission Range In ieee
802.11g

Thank you very much dear Alfonoso for your prompt reply .

Or

Thank you in advance

--

[Faranak Moayeri]

Dear Alfonoso,

You said the unit of pSend and received power is Watt,


Why in this command in PathLossReceptionMdel.cc in src/ linklayer /
radio directory we calculate the received power in mW ? if i
misunderstood please someone inform me ?

double mWValue = pSend * waveLength * waveLength / (16 * M_PI * M_PI *
pow(distance, pathLossAlpha));
double dBmValue = mW2dBm(mWValue);

Also, we define the pMax in channelcontrol.ned in mW?

double pMax @unit("mW") = default(20mW); // maximum sending power used
for this network (in mW)

I got confused please someone help me.

THank you in advance.

[Faranak Moayeri]

Thank You Dear Alfonoso,

I am very grateful to you if you answer another question .

Thank you in advacne

[Alfonso Ariza Quintana]

pSend is the transmission power and must be equal or lower that pMax

-----Mensaje original-----
From: Faranak Moayeri

Sent: Monday, October 17, 2011 10:21 AM

To: omnetpp
Subject: [Omnetpp-l] Re: Calculation of the Transmission Range In ieee
802.11g

Dear Alfonoso,

THank you in advance.

--

[Faranak Moayeri]

Dear Alfonoso thank you for reply but,

my question was about its units,

You said that the unit of received power is Watt ? according to this
formula is mW ? am i right ?

double mWValue = pSend * waveLength * waveLength / (16 * M_PI * M_PI
*
pow(distance, pathLossAlpha));
double dBmValue = mW2dBm(mWValue);

THank you

[Alfonso Ariza Quintana]

If you use mWatt the result is in mWatt, the unit is the watt the other are
submultiples.
Usually in communications the transmission power is measured in dBm and for
this reason the values are often offered in submultiples of Watt (in this
case mili Watt).

dBm = 10 log (p(in wat)/1e-3) that is the same that 10 log(p(in miliwat)/1)

-----Mensaje original-----
From: Faranak Moayeri

Sent: Monday, October 17, 2011 11:31 AM

To: omnetpp
Subject: [Omnetpp-l] Re: Calculation of the Transmission Range In ieee
802.11g

Dear Alfonoso thank you for reply but,

THank you

--

[Faranak Moayeri]

Thank you For your prompt replay :)