MMWCAS-RF-EVM: Calculating the magnitude in dB

Dayalan Nair

Part Number: MMWCAS-RF-EVM

Hi, I found that in the cascade_MIMO_signalProcessing.m script on line 155, 10*log is used. Should this not be 20*log? Here is the line, which I believe integrates all virtual antenna (NTX * NRX) frames into a single range-Doppler frame and converts to dB

sig_integrate = 10*log10(sum((abs(DopplerFFTOut)).^2,3) + 1);

over 1 year ago

0 Cesar over 1 year ago

TI__Guru*** 148594 points

Hi,

I Please give more more time to look into this

Will get back second half of this week

thank you

Cesar

0 Cesar over 1 year ago in reply to Cesar

TI__Guru*** 148594 points

Hi,

I still have not received feedback on this.

I will get back to you next week

thank you

Cesar

0 Cesar over 1 year ago in reply to Cesar

TI__Guru*** 148594 points

Hi,

Sorry for the delay

The reason why it is 10Log is that we have squared in log()

thank you

Cesar

0 Dayalan Nair over 1 year ago in reply to Cesar

Prodigy 220 points

Hi,

Is the square used as a square law detector? I understand that removing the square and doing 20*log will produce the magnitude in dB. Not sure why it was not written this way initially.

Thanks

+1 Cesar over 1 year ago in reply to Dayalan Nair

TI__Guru*** 148594 points

When implementing the code on the chip it is easier to implement the square than square root. This is the reason why square is used

thank you

Cesar

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MMWCAS-RF-EVM: Calculating the magnitude in dB