Hi Weigang, You are right. You cant change the transmission range from the TCL file because it is set to a default value in the underwaterpropagation.cc. You will find the following command in the beginning of underwaterchannel.cc. double UnderwaterChannel::distCST_ =1150.0; It need not be 1150 in your version of Aqua-Sim, still the value given here is the transmission range used. So, if you want to change the transmission range, change it in underwaterchannel.cc. Please dont forget to compile it once you have modified the .cc file (make clean, make, make install). Hope your problem is solved. Regarding the noise parameters in underwaterpropagation.cc, this module just implements the Thorp's propagation model, noise does not come into picture in it. Regards, Jalaja M J Research Scholar, NIT Calicut, India On Mon, May 16, 2016 at 8:31 PM, Weigang Bai <[log in to unmask]> wrote: > hi, > I have some questions about aqua-sim,can anyone help me ? > 1. In file underwaterpropagation.cc, there are no ambient nosie > parameters? > 2. If i want to change the communication range, I can just change the > Pt_ and RXThresh? > 3. In the paper 'An NS-2 Based Simulator for Underwater Sensor > Netwotks', the author say that 'Aqua-Sim provides users two ways to > determine the transmission range: > one way is to set the transmission power and the threshold of received > power level; and the other way is to set the transmission range directly.' > but I have not found the second way. > Although the parameter opt(range) is used in vbf_example_5.tcl, the parameter > opt(range) have not been called though the whole program. > 4. In the file of vbf_example_5.tcl, the parameter control_packet_size > is not belong to vectorbasedforward.cc , it should be in > vectorbasedvoidavoidance.cc? > 5. I can not understand the grammar set rt [$node_(0) set ragent_ ] in > vbf_example_5.tcl? > > Thanks for everyone! > Best wishes! > -- ************************ *CAUTION - Disclaimer* *************************************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. RIT has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. *Please do not print this email unless it is absolutely necessary. Lets' go GREEN.* *Rajiv Gandhi Institute of Technology* ******** End of Disclaimer **********************