Thanks for your help. I expect the error is less than 0.01 (i.e. when 20 nodes, 0.71-0.70=0.01) , Is that reasonable or achievable? I found the ns-2 results in some paper matches very well with Bianchi's model (less than 0.01). I wonder how to achieve this accuracy. Is there any amendment needed to conform the ns2 implementation to the model?
Moreover, I found the results are closer when I changed the scenario from 200x200m to 100x100m. Is it because that the default transmission range is 250m in ns2, so that some stations may not be able to send packets to its destination in 200x200m scenario, so it overestimated the throughput? Here are the results, could the model and ns2 match any closer? nodes 10 20 30 40 Model 0.76 0.70 0.66 0.64 Sim(200x200) 0.77 0.72 0.69 0.68 Sim(100x100) 0.76 0.71 0.68 0.65 >From: "Joshua Robinson" <[EMAIL PROTECTED]> >To: "? ?" <[EMAIL PROTECTED]> >Subject: Re: [ns] validation of saturation throughput in 802.11 >Date: Thu, 21 Dec 2006 16:19:00 -0600 > >do not forget that both model and simulation are not perfect and so it >is not reasonable to expect an exact match. I suggest also figuring >out what error you expect/find reasonable. > >On 12/21/06, ? ? <[EMAIL PROTECTED]> wrote: >> >>Hi all, >> >>I am validating the saturation throughput of bianchi's model , however , I >>found my results do not match the model well. Both model and simulations >>are with DSSS parameters and the packet size is 8000 bits. Stations are >>identical , locate in 200mx200m square. CBR traffic is adopted and the >>date >>rate is high enough to assure saturation. The results are as belows. >> >>nodes 10 20 30 40 >> >>Model 0.76 0.70 0.66 0.64 >> >>Sim 0.77 0.72 0.69 0.68 >> >>The ns-2 version is 2.28. Simulation time is 600 seconds. >>Could anyone helps me? Thanks in advance. >> >>Sincerely, >>joshua >> >>_________________________________________________________________ >>Don't just search. Find. Check out the new MSN Search! >>http://search.msn.click-url.com/go/onm00200636ave/direct/01/ >> >> _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
