Hi, I'm transmitting a signal and receiving it using USRPs and want to estimate the frequency offset, but I'm getting something confusing.
I'm using 2.45GHz for the transmitting, and the sampling rate is 1MHz. The signal consists of 5 repeated preambles, and each of them has 100 data points (i.e. 100μs). Totally the signal has 500 data points (500μs), with a period of 100μs. After getting the received data, I can use a pair of data points whose distance is 100μs to calculate the frequency offset. However, if I use different pairs of data points, I will get different results. For example, if the received signal is [y1, y2, y3, ..., y101, y102, y103, ..., y499, y500], the frequency offset calculated by y101 and y1 is different from that calculted by y102 and y2, and that happens for all the pairs of data points. I should have got similar frequency offsets when using different pairs of data, but actually I got different results for each pair of the data. Does anyone know what the case is, or any suggestions on the right way to calculate frequency offset? Thanks a lot! Best, Fengyang
_______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
