I am using two USRP to find the average PER at a certain distance, but
the average PER at a certain distance seems to be varying every day.
Yesterday, the PER was around 5%Â when two usprsÂ were 10 feet apart, but
today the PER was around 2.5%Â which has been diminished by 50%! How
does this come? I am really shocked? My wireless environment is
In door environment; the temperature are the same in these two
experiments; center frequency is 2479MHz because on one hand, I want to
avoid the 2400MHz to 2483MHz band which is the working band of 802.11,
on the other hand the bandpass filter on the 2400MHz daugterboard (2400M
to 2483M)Â and the bandwidth ofÂ USB port which is 8MHzÂ togetherÂ forced me
to chose the center frequency to beÂ at most 2479MHz; all other
conditions in these two experiments are the same: chairs and desks are
fastened, not being moved, etc.
I am very confused about the different results USRP gave me in these two
days. Could some one tell me the reason? Any hint will be highly
Thanks a lot!