Greetings, Many of my questions to this mailing list have gone unanswered in the past, presumably because they were too basic. I hope to have more luck with this one. I am going to develop a flexible OFDM communication system using (at first) 2 devices each connected to a different host computer. I want to use UHD to make a console application which I will use with MATLAB using the system() command. I plan to do the timing and frequency offset estimations and correction in MATLAB after successfully transmitting between the two devices. My idea so far is to transmit by reading IQ samples from a source binary file and then upon reception, to save IQ sample data to a destination binary file. Since the sample data will be OFDM symbols and /or training symbols, it will not be a continuous transmission. I want to make sure that at the UHD end, timing differences as minimum as possible. What I mean is that if (assuming equal sampling rates and samples per packet on both ends) I want to transmit 1e6 samples, I want the receiver to atleast receive all but 1 or 2 packets of the transmitted data. Could someone suggest how I could achieve this ? Will I have to use threads and schedule thread priorities ? So far I am receiving IQ samples but with 10 powers -9 to -14 so I am assuming it's just noise. Using a reference clock to synchronize is not an option for me. I'd appreciate any help. Best Regards, Sanat Gulvadi