Hi Shane, Your data scaling depends on the data type of the vector you’re sending to the USRP transmitter object.
See https://www.mathworks.com/help/supportpkg/usrpradio/ug/comm.sdrutransmitter.step.html for the scaling needed for your data. On that page, find the Input Arguments section, and look for X – Input signal. Best, Mike From: USRP-users [mailto:[email protected]] On Behalf Of Shane Petcavich via USRP-users Sent: Wednesday, April 4, 2018 5:55 PM To: [email protected] Subject: [USRP-users] Matlab USRP Gain question Hi, I'm using the B210 with Matlab's usrp integration. I have an issue which I can't seem to fully understand. I'm preparing ofdm data to send which is between +/- 1. However the data transport type on matlab says int16 (assuming its signed). So should I be scaling my data I'm sending to the USRP with 2^16 or (2^16 -1)/2? Right now with two vert2450 antennas little comes up on my receive side (even at 3 feet away) unless the tx gain (matlab parameter) is 80 and my rx gain is 40 and I've multiplied my ofdm signal to transmit by 4... most of the examples in matlab are using a 20-30 dB gain on the tx and rx side. Not sure how to properly format my data and gain values to maximize SNR. Thanks, Shane
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