How to calculate SNR and BER using USRP 2920 with LFTX and LFRX daugher boards.
I have few questions regarding SNR and BER measurement:
I am using two USRP 2920 with daughter boards LFTX and LFRX. One is completely Tx and anothe one is completely Rx. I have following few questions:
Q1: How to control/change Energy per bit (Eb) in LabView? Since for calculating BER you have to increase SNR, and for increasing SNR you have to increase Eb. So can anybody guide me how to increase Eb in LabView?
Q2: Can any body tell me about the noise floor of the above mentioned daughter boards?
Q3: How to set the transmit power of the USRP in LabView? What is the maximum power the above mentioned daughter boards can provide and How should I adjust the "Gain" parameter to transmit the signal with the maximun power?
Thanks
JK
Hi JK,
The energy per bit calculation, as I understand it, is the ratio of the signal power to the bit rate. This means that to increase it, you have to either increase the overall power you are transmitting or decrease the user bit rate. In LabVIEW, you would do this by increasing the gain or by decreasing the IQ rate.
I'm not sure of the noise floor on those boards, but I did have a question. The USRP 2920 is sold in a particular configuration. Did you take it apart and put in the LFTX and LFRX boards? Or is it an Ettus board with these daughterboards attached?
-Jim B
Applications Engineer, National Instruments
CLD, CTD
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