John, you need to convert the receive power to SINR and look at the default PCR curve files for the data rate you are using. Assuming you are using default parameters, the receiver sensitivity will be about -97. Based on the plots, it looks like the lowest SINR value is about 17. This means only the 48Mbps and 54Mbps rates would experience loss while all other rates will have no loss.
kb Kaushik B. Patel Adjacent Link LLC On 05/20/2015 02:00 PM, John Powell wrote: > Greetings, > > Using EMANE 0.9.1 I have a two NEMs configured to use raw transport on > two machines, one NEM per machine. One NEM is stationary and one is mobile, > both have one ieee80211abg interface. Traffic flows properly between two > external machines, that are my traffic generator and sink, through the NEMs > with the exception of the packet loss rate. > > The scenario.eel file I'm using contains the following pair of lines: > > 2.6 nem:2 location gps 36.2419,-116.8258,120.0 > 2.6 nem:1 pathloss nem:2,50.3,50.3 > > Similar pairs of lines are included to modify location and pathloss every > 200 milliseconds. These emit events that I am recording on the traffic > generator along with the congestion window of a single TCP stream to the > traffic sink. I compared this to the results of the live test that I used > to generate the scenario.eel file and discovered that EMANE is not changing > the rate of packet loss based on the changes to pathloss. > > Example results: http://imgur.com/a/Liu5g > Notes: Although packet loss was not recorded the TCP congestion window > can stand in as a reasonably reliable proxy for packet loss. > The graphs both display RSSI rather than pathloss. The RSSI > value for the live graph was obtained directly from the WiFi card. > The RSSI value for the EMANE graph is calculated from the > pathloss and TX power. > > Even manual changes to the TX power of the NEMs to excessively high > values (200dBm instead of 20dBm) had no effect on the packet loss rate. I > would appreciate any help debugging this. > > John > > > > _______________________________________________ > emane-users mailing list > [email protected] > http://pf.itd.nrl.navy.mil/mailman/listinfo/emane-users > _______________________________________________ emane-users mailing list [email protected] http://pf.itd.nrl.navy.mil/mailman/listinfo/emane-users
