I have bacground in EMC testing but not familiar with MIMO wireless type radios. How much does this type of testing differ from normal EMC testing of a typical radio from the 1970 technologies?
@Fanny: In one of your earlier comments, you say "important in the radio design to filter the power supply well" However, 60HZ is expected to go through the shielded boxes due to its massive "skin effect" on the walls. How do you threat that?
you can find a paper on channel emulation, including the doppler fading on our website at http://octoscope.com/English/Collaterals/Whitepapers/octoScope_WP_MIMOChannelEmulator_20101202.pdf
yes - enclosure make up the controlled RF environment. The communications medium is the air inside coupling the DUT and the test antennas and any attenuators that may be connected.
would you be able to conduct a simulation ( usiung software simulator) instead of using actual channel emulation. When do use OTA vs controlled enviroment. would you able to duplicate drive test results in a controlled enviroment?
sometimes you can see the harmonics of the 60 Hz on the signal and sometimes it will appear on the baseband signal as wobble - important in the radio design to filter the power supply well
@Fanny: I know the two enclosures are supposed to be an isolation, but isn't it also supposed to be a controlled communication medium? That's why Ireferred to it as "wall". Please, clarify.
yes - wiring will act like antenna and couple signals bidirectionally - from the outside into the test set up and from the test setup out to any other receivers
the filters have to be low pass, passing through Ethernet and USB signals and filtering out the carrier frequency (e.g. 700 MHz up to 6 GHz) where the DUTs operate
@octoscope: Since wiring can bring RF into the controlled test environment, it would seem it can also leak it out which would seem to have security implications. Care to comment?
Thank you Fanny and Ann. I really don't mind stepping off the path for questions or side comments. These sessions are more of a journey than a point-to-point goal. I also like the interaction during the session.
A reminder, if you've got additional questions for Fanny, she will answer them in the second part of the show on the comments page, starting in just a few minutes.
@BurghEE - I am refering to Ann's questions (or other in depth pertitent questions). it is understood that questions from the audience are queued for the Q&A questions at end of sessions.
jl, you're questions are basic - i.e."what is conducted testing?" - there are plenty of fundamental reviews available rather than sidetracking a technical presentation.
If you haven't told us yet, please let us know 1) if you've used conducted testing, 2) if you've used controlled over-the-air testing, 3) whether you're involved with licensed radio technology that requires carrier certification, and if so, what technology: GSM, CDMA, 3G, or LTE?, and 4) if you are familiar with channel emulation.
If you haven't told us yet, please let us know 1) if you've used conducted testing, 2) if you've used controlled over-the-air testing, 3) whether you're involved with licensed radio technology that requires carrier certification, and if so, what technology: GSM, CDMA, 3G, or LTE?
@Ann - your voice is not projecting over the radio, it is weak and hard to hear. Could you please post your questions so that we have a reference to what is being answered. Thanks
I used to do it a long time ago, today I am working in ideveloment Mobile Network in my Country, Install RBS equipment 2G, 3G , feeder and Antennas also,
@Ann - your voice is not projecting over the radio, it is weak and hard to hear. Could you please post your questions so that we have a reference to what is being answered. Thanks
@octoscope: Since wiring can bring RF into the controlled test environment, it would seem it can also leak it out which would seem to have security implications. Care to comment?
Iuse ready made modules for my RF (LFN sensor nets) -- but it helps to know how to read the specs -- so that the physical layout of the net can be made easier.
Sr. Consultant I'm currently working on government computer network systems, but I used to work on networking software defined radios. I have a lot of "bits and pieces" of technical information stored and I find it useful to have such overviews as these webinars contain. It kind of ties things together for me.
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