APP RX FFT

Figure 1 - APP RX FFT Overview

Architecture summary :

• Data Load - Fetch I/Q data from sync fifo, forward to FFT Core
  

• FFT - Compute Fast Fourier Transform
  
  • FFT Core - Programmable number of FFT points e.g. N = 8, 16, 32, 64, 128, 256, 512 or 1024-pt
  • FFT Control - Initiate start of FFT processing, can be used to throttle the FFT packet rate

• Average/Power? - Compute Power average using incoming FFT I/Q data
  
  • AVG Processor - Compute power using previous data (stored in AVG RAM) and current data from FFT Core
  • AVG Prefetch - Fetch previous computed average data and forward to AVG Processor. At the end of average processing, forward payload to Packet Processor for IP/UDP wrapping.
  • AVG Control - Initiate start and number of times the Averaging/Power? calculation is invoked, N_avg = 2, 4, 6, 8, 16, 32, 64, 128, 256.

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