2.7 GHz vs 6 GHz... Differences of EVM

Guys HW RF NOR expensive,

I have a 2.7 GHz DAMA, but also a 6 GHz DAMA...

I see a huge difference in my readings of EVM with the

even a Labview VI and had TO send a pre-defined package.

I'm decoding my frames in the 2.4 GHz band.

I get favorable results in the DAMA 2.7 GHz.

Can someone explain why is this huge difference in EVM

When I have not changed my Labview VI and transmission conditions HAD

Kind regards

Diakité

"Shouldn't EVM will be same without regard to differences in HW?

Not necessarily. Precision amplitude and phase noise impact on EVM and although I do not at this point these are the explanations, HW makes a big impact on the performance of EVM in general. Digitizer differentiates 5660 5661 probably won't make a big difference in performance and, indeed, you'll notice the EVM specs for 5660 and 5661 are the same.

"Andy, just in case you were worried about the signal saturation / clipping... '. »

I'm worried because of saturation. You generate a signal of 0 dBm in a parser which the maximum input level has been set to-10 dBm. How things change when you use the appropriate reference level of 0 dBm? You say that you capture a clean RF signal and I am curious to know how you determine this? Visually by looking at the spectrum? Distortion of the signal leads to amplitude errors and amplitude errors are one of the components of what measures of EVM. Do you see a difference between reference level of 0 and -10 dBm EVM?

Our EVM of QAM specifications are listed in the 5663 Plug and can be compared to 5660/5661 EVM specs. These data clearly show that the EVM platform 6.6 GHZ performance is better than the 2.7 GHz platform.

A difference between the 2.7 GHz platform and the platform of 6.6 GHz is the amount of "margin" between the baseline of the SMU-5663 and level of clipping of the instrument. A reference level of dBm-10 place the level of clipping/overload to 0 dBm on the platform of 2.7 GHz. The same reference level would put the level of clipping to dBm - 4 I think (I could be shifted by 1 or 2 dB but not much more) on platform 6 GHz. In all cases, it is smaller on the platform of 6 GHz since the 6 GHz platform has 1 dB attenuation resolution (as opposed to the resolution of 10 dB on the platform of 2.7 GHz) and requires not a greater margin amount. This could very well be your problem.

As a test, you must run the sample generator and Analyzer for the QPSK Modulation Toolkit and see what happens. Also, perhaps we can provide more help if you provide your code and capacity toreproduce behavior that you see. If we can reproduce it we can understand why you see the differences. At least I recommend using a correct value for the reference level.

Kind regards

Andy Hinde

National Instruments

Tags: NI Products

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