Re: [ns] RXThresh values!!
It works with me. Thanks, Quoting Saravanan Kandasamy svana...@gmail.com: Dear Wben, I presume you like to know the relationship between distance vs RXthresh ? It might not be that straight forward as it depends on which multipath propagation you like to use. Assume this topology -Two nodes (T and R), node T would be transmitting to node R placed x meter away. You need to know, 1. Frequency you like to operate 2. Which multipath propagation you like to use. 3. Transmit power 4. Gain of antenna 5. Height of the transmitter and receiver Assume Two-Ray Ground Reflection Model Method 1. Using the frequency, calculate the cut off distance (m) using (4*PI*ht*hr)/lambda where lambda is c/freq, ht and hr is the height of T and R. 2. If the T-R separation is below the cut off distance, use Friis Equation, if it is above the cut off distance use two-ray reflection model. 3. The Pr is the RXThresh you need to set in your simulation varying the distance from the Friis/Two-ray ground reflection equation which you can easily get from the internet. So when you get 300m using 1.76149e-10W RxThresh most likely you used two-ray ground reflection model operating at 2.4GHz frequency. Good luck. rgds Saravanan K On Sat, Aug 4, 2012 at 2:18 PM, wben-...@labri.fr wrote: Dear all, Has anyone an idea about the different corresponding values of the parameter RXThresh, when varying the distances. Or when I could find these values? set RXThresh 1.76149e-10 ;#compute with threshold.cc for distance 300m Thanks.
[ns] RXThresh values!!
Dear all, Has anyone an idea about the different corresponding values of the parameter RXThresh, when varying the distances. Or when I could find these values? set RXThresh 1.76149e-10 ;#compute with threshold.cc for distance 300m Thanks.
Re: [ns] RXThresh values!!
Dear Wben, I presume you like to know the relationship between distance vs RXthresh ? It might not be that straight forward as it depends on which multipath propagation you like to use. Assume this topology -Two nodes (T and R), node T would be transmitting to node R placed x meter away. You need to know, 1. Frequency you like to operate 2. Which multipath propagation you like to use. 3. Transmit power 4. Gain of antenna 5. Height of the transmitter and receiver Assume Two-Ray Ground Reflection Model Method 1. Using the frequency, calculate the cut off distance (m) using (4*PI*ht*hr)/lambda where lambda is c/freq, ht and hr is the height of T and R. 2. If the T-R separation is below the cut off distance, use Friis Equation, if it is above the cut off distance use two-ray reflection model. 3. The Pr is the RXThresh you need to set in your simulation varying the distance from the Friis/Two-ray ground reflection equation which you can easily get from the internet. So when you get 300m using 1.76149e-10W RxThresh most likely you used two-ray ground reflection model operating at 2.4GHz frequency. Good luck. rgds Saravanan K On Sat, Aug 4, 2012 at 2:18 PM, wben-...@labri.fr wrote: Dear all, Has anyone an idea about the different corresponding values of the parameter RXThresh, when varying the distances. Or when I could find these values? set RXThresh 1.76149e-10 ;#compute with threshold.cc for distance 300m Thanks.
