Hi all,
I am trying to create OFDM transmission on USRP 2. I am using two URSP's (XVCR 2450) which are close to each other. To do that I am using Gnu radio 3.7.2 with slightly modify OFDM_benchmark_receiver (see img 1) and transmitter.
But the problem is that I am still receiving packet lost around 1.73 - 2.2 %. Even when I am using direct cable between USRP's the packet lost is the same (around 1.73 - 2.0 % newer below). I don't think it can be frequency offset (I checked exactly what offset i have and corrected it manually).
1) So my first question is how to improve packet lost (my guess is the timing synchronization) and is this packet lost a normal thing in this scenario (without FEC) ?
2) Second question is what methods of timing synchronization (auto correlation function, ?) are used in this OFDM example and where to find them ?
ofdmimg