Hi everyone, I’m hoping for some advice on using RFNoC for a spectrum analysis application (I have another hardware clocking question that I’m going to ask separately).
Context: we need to continuously stream channel power in a bank of 8 contiguous 10 MHz bands on short (a few microseconds) time scales. To manage the initial deluge of IQ, I’d like to use an FPGA to perform a 512-point FFT and then reduce the volume of data by summing up mag2 across frequency to give channel power. The resulting stream of 8 channel power readings every few microseconds is then pretty manageable for transport and processing on the host. After looking at the RFNoC block list, the (wishful thinking? :-)) implementation in my head looks like this: (Radio) → Window → FFT (mag2 output) → Vector IIR to sum across frequency bins → Keep 1 in N → (Stream to host) Some questions have come up on this: 1. Does the Vector IIR at the output of an FFT operate across time or frequency? For “Keep 1 in N,” there’s a clear flag to determine whether the operation is applied by sample or by packet, but I don’t see anything about which of these “Moving Average” “Vector IIR” operate on. 2. Are there any obvious fixed-point traps in doing this? 3. Are there any other pitfalls that I’m missing here? Thanks in advance for any ideas! Dan Kuester (he/him) Project Lead, Spectrum Sensing and Noise Communications Technology Laboratory National Institute of Standards and Technology 325 Broadway St., Boulder, CO 80305, USA
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