Hello, Daniel, I have a same question. You said after you changed "set opt(prop) Propagation/TwoRayGround" to "set opt(prop) Propagation/FreeSpace" the console could output the information correctly. So, I am wondering how can you do that, I mean could you please be kindly to give me an example to show how it works. THanks very much Regards. Liceven
Daniel Rother wrote: > > > Hi, > I've got the same problem. In tcl I haven't found a solution. I > thougth there is something easy like "set strength [$node set > signalstrength]" but it seems there isn't such a think... :( > Because of that I go to the C++-Source-Code. After a little bit of > searching I found the file "wireless-phy.cc" and there the function > "sendUp". I think there the variable "Pr" is the signal strength > (because later in the function "Pr" is compared with "CSTresh_" and > "RXTresh_" wich a used to simulated if a paket is recieved correct or > not). > But now I had the problem that "Pr" alway had got the same value and I > don't know why. I went back to my tcl file and play a little bit with > my settings. As I changed "set opt(prop) Propagation/TwoRayGround" to > "set opt(prop) Propagation/FreeSpace" and start a simulation, I've got > an output on my console like "time: 0.008566: d: 31.622777, Pr: > 2.949347e-09" (and there the Pr is chaniging!). First I was wondered > about that, but then I looked into the file "propagation.cc" and there > I found in the function Pr() "printf("%lf: d: %lf, Pr: %e\n", > Scheduler::instance().clock(), d, Pr);". So I copy that and put it > into the file "tworayground.cc" at the same position (the function Pr) > and now it seems to work. > But I always have a question: Why is Pr in "tworayground" changing and > in "wireless-phy" not? And is it the correct position to read out the > signal strength? > I've alway looked into the file "mac-802_11.cc" and the function > "send" but there "Pr" also seems not to work correct (there it is > alwas "1.600278e-02" or "-1"...) What do I have to change? > And a last thing: I want to have the signal strength in dBm. Because > of that I made "10*log10(Pr)" but I'm not sure if I have to use > "10*log10(Pr/0.001)" instead (because 1mW is the referece value for > dBm and I don't know if it is include in Pr or not...) > I hope anybody can help me with my problem(s). Thanks! > Greets Daniel Rother > > > Zitat von angelina socratous <[EMAIL PROTECTED]>: > >> >> >> I have a topology with some access points and some wireless nodes >> attached to them. If a new node wants to join the network how can i >> get the signal strength which the new node receives from each access >> point? >> Should i use c++? If someone has a tutorial for this task it would >> be very helpful. >> >> Thanks, Angelina >> _________________________________________________________________ >> Explore the seven wonders of the world >> http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE >> > > > > > > -- View this message in context: http://www.nabble.com/Calculate-Signal-strength-in-ns2-tp18536913p19248032.html Sent from the ns-users mailing list archive at Nabble.com.