Hello, everybody!
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% when two usprs were 10 feet apart, but today the PER was around 2.5% which has been diminished by 50%! How does this come? I am really shocked? My wireless environment is described below:
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) and the bandwidth of USB port which is 8MHz together forced me to chose the center frequency to be 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 appreciated!!!
Thanks a lot!
Bill