My name is Randy Becker I'm with Keysight Technologies and I'm the director for 5G testbed
program.
What I'd like to do is give you a quick overview of some of the things we're showing here at
European Microwave in October 2017.
What we're showing is some of our latest signal generators and signal analyzers based on our
modular PXI form factor.
This has a couple of unique advantages and benefits.
So inside the inside the platform you can see there are a number of different modules
here we have PXI modules that perform different functions like up converters, basement generators,
local oscillators.
These taking together can form a signal generator and conversely on this side we formed a signal
analyzer.
We could actually combine both of these into a single chassis as well.
So this offers a number of important benefits, first of all it's very scalable we offer these
modules with a wide range of options and performance.
It's also very flexible as I mentioned you can have multiple instruments in a single
chassis that can do different things maybe you want multiple signal generators or even
an analyzer and a generator or multiple analyzers.
Additionally, as you can see it'd be very easy to replace one of these modules this
makes it all so very upgradable.
Keysight will continue to invest in the latest technologies it will introduce new modules
with the latest performance.
So what we're specifically showing here is the signal generator this is the soft front
panel for the signal generator.
We've tuned the frequency to 28 Gigahertz which is an area that is very important for
5G at the moment.
We've set the amplitude to -3 dBm, and we've picked a waveform it's actually the Verizon
pre 5G waveform which is composed of eight component carriers, each component carriers
100 Megahertz wide for a total bandwidth of about 800 Megahertz.
This configuration can generate signals up to 44 Gigahertz, with the Gigahertz bandwidth
and 1% EVM.
For the demo our device under test is a four by four phased array antenna that we've mounted
on a platform that can be mechanically steered, we can also make an electronically steer the
beam pattern from the phased array.
We can control both the amplitude and phase to the individual elements to form the beam.
On this side we have the analyzer we're receiving the signal with this horn antenna, and that
is then connected directly to the input of the analyzer; and there we're able to make
a number of different important measurements.
So on the screen you can see here first of all in the middle we have the eight different
component carriers, we have a pair of band power markers showing the total power, and
on top of that I've superimposed this curve, which is the CCDF curve.
So that'll give us an indication of the peak to average ratio for the signal.
Above that we can see the constellation diagram so you can see that this is in fact a 64 quantum
signal.
Down below here I'm showing the EVM as a function of subcarrier, but we could also look at that
as a function of symbol where each line here represents each individual symbol; each symbol
we're plotting all of the different subcarriers.
Over here we see the EVM Metrics, so right now we're reading about 2.4 over this live
over-the-air link; and here we have EVM broken down by the individual channels, like the
control channel, and the physical shared downlink channel.
These two plots are showing the antenna characteristics, and I'll give you a quick demonstration of
that we actually have a small control program here that we're using to control this board
which controls the servo motors and the beam pattern.
So what I'm going to do is do a very fast sweep I'm going to do sweep from minus 45
degrees to plus 45 degrees in azimuth in five degree steps we can set the step size but
I'm going to use five so that this will run fairly quickly.
So I press run sweep you'll see that the servo moves and now we're gonna make measurements
every five degrees, and you'll see the display is updating so you can see that is reported
off axis that the constellation gets a bit fuzzier because we're receiving little of
that signal at that moment in time and then it should become more in focus and then become
fuzzier again as we move away from the receive antenna.
So after the sweep is complete we have a picture here of the antenna power or the antenna pattern
rather and it looks fairly coarse because I did coarse steps in azimuth.
Below that we're plotting the EVM as a function of the azimuth angle.
So obviously we want to know what the antenna characteristics are, but the question that
comes to mind now is how did the RF parametrics change as a function of the antenna position
or as a function of the beam angle.
And so here we can see that roughly we have areas of low EVM where the power was higher.
Here we see a spike in the EVM where we had nulls in the antenna pattern.
these two traces here I'll just rescale these, these are three-dimensional plots here I just
did a scan at one elevation angle but we can also scan elevation and azimuth together to
form a three-dimensional plot.
These are measurements that I made previously and here you can see clearly the main lobe
with the different side lobes and you have an idea of what the antenna characteristics
look like.
Below that we're also plotting the EVM so the cooler temperatures represent areas of
lower EVM.
And then this trace on top I've plotted three different things simultaneously: we have the
equalizer response both in amplitude and phase so I'll to give us an idea what's happening
the air over the channel rather, and then this middle trace is showing the equalizer
impulse response and that can also give us an idea of how many reflections may be occurring
at any given time.
So in conclusion what we're looking at here is a Keysight's latest test bed for 5G, and
a number of the different measurements that we can make.
This is just a sampling of some of the measurements these screens are completely configurable
in fact here if I want to get a close-up of the constellation diagram I can do that.
And if I put my hand here over the antenna you can see that the signal will go away so
in fact this is in real time over-the-air.
So please visit Keysight.com for more questions or contact one of your local representatives.
Thanks for watching.