Hi, I am interested in implementing a relatively simple repeater application on the X310 and E310. I ran the Ettus rfnoc_radio_loopback example and this is nearly a perfect fit for the functionality I want. However, I am wondering how my application can intelligently set the Rx Gain & Tx Gain. Actually, the Tx gain is easy: I can leave it fixed or I can change it inversely with the Rx gain to maintain constant loop gain. But, the Rx Gain I would like to set based on input signal power.
I'm not thinking of a fast AGC or even logic residing on the FPGA at all. I'm thinking more along the lines of the host PC occasionally querying an "rssi" or other digital power estimate and then changing the Rx gain in response. I don't care about actual power levels - I just want to maximize the digital dynamic range. I know that I can implement a custom RFNoC block that simply passes samples through while computing this estimate such that it can be queried with a register read. But, before doing so, I'm wondering if something already exists such that I wouldn't have to do so. Rob
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