[ns] rayleigh fading channel

2007-01-05 Thread bhaskar sardar
I want to model wireless channels according to rayleigh fading channel. But I have not find any such support in NS-2. Could any one tell me how can i use rayleigh fading model in ns2.

[ns] Scheduler going backwards

2007-06-07 Thread bhaskar sardar
when i run a simulation i got the following messeges... BEB limit exceeded: dropping packets ns: scheduler going back in time from 7.0005683 to 0.000 Is it necessary to change the BEB limit? How the scheduler can be prevented from going back? thanks in advance.

[ns] verying link capacity dynamically

2007-08-13 Thread bhaskar sardar
Is there any way to dynamically change the bandwidth of a wireless link. I mean, during first 10 sec of the simulation BW is 1 Mb, for next 10 seconds BW is 2 Mb and so on. This is required when a user moves very fast. Thanks in advance. Bhaskar Sardar

[ns] ns-2.31 installation failed

2007-08-22 Thread bhaskar sardar
t. Please see www.Scriptics.com to see if they have a fix for your platform. Please help. Bhaskar Sardar

[ns] Acnowledgement packets are dropped

2007-08-26 Thread bhaskar sardar
Hi everybody I am running a wired-cum-wireless simulation. I am using rayleigh fading model. I observed that most of the TCP ACK packets are dropped. Is there any way to prevent these drops? Thanks in advance. Bhaskar Sardar

[ns] rayleigh fading model

2007-08-26 Thread bhaskar sardar
In a wireless simulation, wireless links are modelled using rayleigh fading model (fdT=.01). Do I need to insert an error module (e.g. drop packets at .1% rate) in the wireless link? How can I control the error process? I want to drop packets at 10%, 1% and .1% rate. Bhaskar Sardar

[ns] URGENT: Problem using Rayleigh/Ricean Model

2007-09-07 Thread bhaskar sardar
Ricean model). I am attaching the code here. Please help. Thanks in advance Regards Bhaskar Sardar set opt(chan) Channel/WirelessChannel ;# channel type set opt(prop) Propagation/Ricean ;# Ricean fading propagation model set opt(netif) Phy/WirelessPhy ;# network interface type set opt(mac) Mac

[ns] TCP ACK packets are dropped

2007-09-25 Thread bhaskar sardar
Dear all Can you tell me how can i prevent ACK packet drops in my simulation. If TCP packets are dropped then i do not have any problem. I have taken special care for that. But as the ACK packets are dropped I am not getting the desired result. Please answer ASAP. Bhaskar Sardar

[ns] delay for wireless link

2006-01-26 Thread bhaskar sardar
how to include delay between two wireless nodes?? please reply quickly