Dear all,
I'm transmitting some data between two usrps (N210) and using OFDM blocks in GRC in the two computers. My experiment is getting BER in a range of SNRs, like 0~20dB. So I need to set the usrps to get a range of SNRs. However, fixing one usrp and moving the other along a line from 0m to 3m doesn't change SNR much. I also tried tuning antenna gain of UHD source in GRC and found that higher the receiving gain, lower the SNR, why? Also, the highest SNR I ever got is around 9dB using 16qam.
However, could anyone tell me how to set or locate usrps to get a series of gradually increasing SNRs from 0~20dB? Thank you very munch! Any help is appreciated.
Best,
Jia