AWR1642: The detectable SNR of the RX for AWR1642

Michael Su

Part Number: AWR1642

Hi,

We are calculating the link buget to design the antenna gain, but we need to know what is the detectable SNR of the AWR1642 RX? could you provide it for us?

Thanks

Michael Su

over 5 years ago

0 Vivek Dham over 5 years ago

TI__Guru 58035 points

Hello Michael,
The detectable SNR is configured by detection algorithms you would implement on the AWR1642 and the detection thresholds you set in the algorithm. This is not something restricted by the device but by your algorithm.

Regards,
Vivek

0 Michael Su over 5 years ago in reply to Vivek Dham

Intellectual 570 points

Hi ViVek,

We are designing the antenna and calculating the antenna gain that the radar system needs based on max. detectable range, if no RX sensitivity or detectable SNR of AWR1642 is provided, how we should decide the antenna gain? or how we should decide the reasonable SNR for the RX of AWR1642?

Thanks
Michael Su

0 Vivek Dham over 5 years ago in reply to Michael Su

TI__Guru 58035 points

Hello Michael,
The AWR1642 device does not have a fixed "detectable SNR" value, this is something that is derived based on system requirements of your application. It depends on the kind of false alarm rates you can tolerate etc. An SNR of 14 to 18dB is commonly used (18 being on a conservative side to reduce false alarms). I would suggest for antenna design you use a conservative SNR value and then you can optimize it further after some field tests.

Regards,
Vivek

0 Michael Su over 5 years ago in reply to Vivek Dham

Intellectual 570 points

Hi Vivek,

Thanks for your reply,

one more qyestion,

Where is this SNR measured ? at input of the RX LNA? output of RX LNA? or at input of ADC ?

Thanks

Michael Su

0 Michael Su over 5 years ago in reply to Michael Su

Intellectual 570 points

Hi Vivek,

Any comment ?

Thanks

Michael Su

0 Vivek Dham over 5 years ago in reply to Michael Su

TI__Guru 58035 points

Hello Michael,
The SNR is measured on the ADC data after the FFTs, this is also part of the algorithm.

Regards,
Vivek

0 Michael Su over 5 years ago in reply to Vivek Dham

Intellectual 570 points

Hi Vivek,

The SNR is measured on ADC, so it undergoes the LNA gain and IF gain, right?

but for antenna design, the path the antenna engineer should consider is from TX output to RX input ( before LNA), right?

so I wonder that the RX SNR, 14 ~ 18dB, you siad before can be provided for antenna design?

Thanks

Michael Su

0 Vivek Dham over 5 years ago in reply to Michael Su

TI__Guru 58035 points

Hello Michael,

The detection always happens on the SNR as seen from the ADC data of the RX channel. The SNR would depend on multiple factors like the TX o/p, antenna gain, distance of the object, RCS of the object. All these factors need to be considered while arriving at the antenna gain needed.

You can use the sensing estimator tool we provide to help you do some of these analyses (https://dev.ti.com/gallery/view/1792614/mmWaveSensingEstimator/ver/1.3.0/ )

Regards,

Vivek

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AWR1642: The detectable SNR of the RX for AWR1642