AWR1243: Plot 1D FFT data from AWR1243 ADC data

Neil29

Part Number: AWR1243
Other Parts Discussed in Thread: AWR1642,

Hello Community,

I am using DCA1000 and AWR1243 to get raw ADC data. I wrote algorithm in C to read ADC data and perform 1D FFT on it using the AWR1642 source files. I mentained the flow of steps as mentioned in Doxygen files and AWR1642. On the Raw ADC data I performed the windowing and then did the FFT calculation using window data and twiddle factor. I get at the out the real and imaginary values. I want to plot the FFT on graph now using those values. But these values are not in dB. What processing I need to do to obtain values in dB so that I could plot the 1DFFT.

Regards,

Neil

over 7 years ago

0 Anil Mani over 7 years ago

TI__Expert 4720 points

Hi Neil,

I am not sure I understand the question.

After the 1D-FFT (with the output denoted by x(n) = rx(n) + i ix(n), rx being the real part of the FFT output, and ix being the imaginary part), you can simply plot 10*log10(|x(n)|) to get the output in dB.

Regards

Anil

0 Neil29 over 7 years ago in reply to Anil Mani

Intellectual 470 points

Hello Anil,

Thank you for the answer. This is exactly what I needed. But while plotting the 1DFFT data in matlab the obtained data is very huge for each antenna. Is it required to downsample the data for plotting?

Regards,
Neil

0 Anil Mani over 7 years ago in reply to Neil29

TI__Expert 4720 points

Hi Neil,

I don't understand the question. What do you mean by 'data is huge for each antenna'?

Regards

Anil

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AWR1243: Plot 1D FFT data from AWR1243 ADC data