AWR2944: Question about interference mitigation scale value in SDK 4.2.0.3

Allen35065

Part Number: AWR2944

Hi expert,

In current SDK for AWR2944, we saw it use below function to decide the threshold of inteference mitigation module.

Could you please clarify the meaning of (256*2) for scale_curr calculation? I don't understand what is this ratio stand for.

uint32_t rangeProcHWADDMA_findIntfStatsStaticParams(uint32_t numSamples, uint32_t SNRdB, uint32_t * scaleVal, uint32_t * shiftVal){

uint32_t scale_best = 0;

uint32_t shift_best = 6;

uint32_t shift, scale_curr;

for(shift = 0; shift <= 6; shift++){

scale_curr = MATHUTILS_ROUND_FLOAT((float)((pow(10, ((double)SNRdB/20.0))/numSamples*(256*2)*(1 << shift))));

if((scale_curr > scale_best) && (scale_curr < (1 << 8) - 1)){

scale_best = scale_curr;

shift_best = shift;

}

*scaleVal = scale_best;

*shiftVal = shift_best;

return 0;

}

Regards,

Allen

over 3 years ago

0 Jitendra Gupta over 3 years ago

TI__Guru 69960 points

Hi Allen,

HWA is being used in the demo for interference calculation, I'll let expert to provide clarification on this calculation.

Re-assigning this thread to an expert.

Regards,

Jitendra

0 Akshay Kumar Chandrasekaran over 3 years ago in reply to Jitendra Gupta

TI__Expert 8275 points

Hi,

Thanks for your patience. The 256*2 is to compensate for the right shift operation that we are doing during the interference stats calculation. You can maybe consider it as a constant to make the hardarwe work properly.

Let me please know if you have any questions.

Thanks and Regards,

Akshay

0 Edward Fangc over 3 years ago in reply to Akshay Kumar Chandrasekaran

Intellectual 330 points

HI AKshay,

Please help to cheak the number 256*2 is related with ADC number? I dont' konw the relationshiip between scale,shift register and 512*2,.

0 Akshay Kumar Chandrasekaran over 3 years ago in reply to Edward Fangc

TI__Expert 8275 points

Hi Edward,

This is not related to ADC number, but if you check the interference stats block in the AWR2944 TRM, you should be able to figure this out.

Let me please know if you have any queries.

Thanks and Regards,

Akshay

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AWR2944: Question about interference mitigation scale value in SDK 4.2.0.3