[ns] Values to be set in the TCL file to make the transmission range 100m
Hi friends, What are the values to be set in the TCL file to make the transmission range 100m. In some mail i got some pointer for this but i am not getting them clearly. There i have to set Pt_ variable to a fixed value. Is it the only value I have to change? or it need some more changes. Then what is the use of values written below other than Pt_. CPThresh_ 10.0 CSThresh_ 1.559e-11 RXThresh_ 3.652e-10 Rb_ 2.0e6 Pt_ 0.2818 freq_ 914e+6 L_ 1.0 Please help me. Thanks a lot. jeevesh kumar - Jiyo cricket on Yahoo! India cricket Yahoo! Messenger Mobile Stay in touch with your buddies all the time.
Re: [ns] Values to be set in the TCL file to make the transmission range 100m
Hi Jeevash There are two method to do it. Method a) You calculate the RxThreshold using a small program written in C called threshold.cc locayed in the folder ns-2.29/indep-utils/propogation/ compile the file as g++ threshold.cc then run the program /a.out with the required distance you want to transmit. In this case the transmit power remains the same as 0.2818 (default 250m) and also the Carrier Sense Threshold (CSThresh) will remain 550+ but the nodes that are 100+ meter away will drop the packages that they receive considering it an error. Method b) You only change the Pt_ value to 7.214e-3 , This will set the maximum transmission range of the node to 100m. so you can choose which option you want to go for I hope this helps regards Hi friends, What are the values to be set in the TCL file to make the transmission range 100m. In some mail i got some pointer for this but i am not getting them clearly. There i have to set Pt_ variable to a fixed value. Is it the only value I have to change? or it need some more changes. Then what is the use of values written below other than Pt_. CPThresh_ 10.0 CSThresh_ 1.559e-11 RXThresh_ 3.652e-10 Rb_ 2.0e6 Pt_ 0.2818 freq_ 914e+6 L_ 1.0 Please help me. Thanks a lot. jeevesh kumar - Jiyo cricket on Yahoo! India cricket Yahoo! Messenger Mobile Stay in touch with your buddies all the time. Kind regards Qasim Raza Iqbal PhD Candidate, ACNRG Lab N504, Office N505 Adaptive Communications Networks Research Group, School of Engineering And Applied Science Aston University Birmingham B4 7ET United Kingdom http://www.ee.aston.ac.uk/research/acrg/index.html
Re: [ns] Values to be set in the TCL file to make the transmission range 100m
transmission range defined internally by distCST_ the transmission range is suppose to be calculated using the parameted below (as you mentioned) and propagation model however by looking at the Wireless Physical code, the propagation model is not implemented yet and thus the result is as -1 which is wrong. so in 2.29 I had no choice to define it as a fix variable myself - still not sure if this is an accurate simualtion. but to explain it, I am setting energy levels and rx/tx power values to make the simulation more accurate. if you look at it from real life view point, devices (based on an initial energy and type of MAC layer pawer consumption) do have a initial fix transmission range am I correct? Sasan Hi friends, What are the values to be set in the TCL file to make the transmission range 100m. In some mail i got some pointer for this but i am not getting them clearly. There i have to set Pt_ variable to a fixed value. Is it the only value I have to change? or it need some more changes. Then what is the use of values written below other than Pt_. CPThresh_ 10.0 CSThresh_ 1.559e-11 RXThresh_ 3.652e-10 Rb_ 2.0e6 Pt_ 0.2818 freq_ 914e+6 L_ 1.0 Please help me. Thanks a lot. jeevesh kumar - Jiyo cricket on Yahoo! India cricket Yahoo! Messenger Mobile Stay in touch with your buddies all the time.
Re: [ns] Values to be set in the TCL file to make the transmission range 100m
Sasan Sahraei schrieb: transmission range defined internally by distCST_ This is only the maximum assumed interference range for a propagation model and will be used to speed up the calculation of packet receivers. the transmission range is suppose to be calculated using the parameted below (as you mentioned) and propagation model however by looking at the Wireless Physical code, the propagation model is not implemented yet and thus the result is as -1 which is wrong. You have various implemented propagation models (e.g. FreeSpace, TwoRayGround, Shadowing). Maybe you just look at the base class for all propagation models. The transmission range is defined by the antennas of the transmitter AND the receiver, the transmission power, signal attenuation, modulation scheme (which results in different receiver sensitivities / RX treshhold) and so on. It is nothing you can compute solely by looking on the transmitter. Just as a little example: two laptops equiped with usual WLAN interface adapters may have a transmission range of 300m in an open area. But with good external antennas you can boost this whithout amplification up to 150km (http://www.wifi-shootout.com/). As a personal advice for every WLAN simulation - use the Shadowing (or better) propagation model if possible. I can provide ready to use parameter sets for different environments if necessary. Daniel.
