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AWR2944: High end corner radar demo: SUM RX via HWA FFT

Part Number: AWR2944
Other Parts Discussed in Thread: TIDEP-01027

Hi experts

In lab0015 High end corner radar demo (TIDEP-01027), 

When we configure  PING SUM RX HWA PARAMSET (line 963  dopplerprochwaDDMA.c ),   we perform 4 point FFT for 768 iterations and then get the sum of 4 RX antenna.

Is my understanding right? Could you pls help explain why we can get the sum by performing FFT?

Thanks