SMC Networks D3USG Manual De Usuario
ANSI C63.17-2006
Methods of Measurement of the Electromagnetic and Operational Compatibility of UPCS Devices
Annex C
C.1
C.2
(informative)
Options for implementing the tests of Clause 7 and Clause 8
This annex discusses recommendations for the multicarrier interference generator that may be used to block
use of particular carriers and timeslots as required by tests of Clause 7 and Clause 8. An example
implementation is provided of one such multicarrier interference generator.
While the tests described in this standard are based on general-purpose instrumentation, tests using
alternative, more specialized instrumentation can, in some cases, be performed more quickly with equally
valid results. For some EUTs (e.g., those operating in conformance with an industry standard air interface),
instruments may be available that are specifically designed to test equipment using a particular type of
modulation, frequency channelization, frame structure, etc. Those instruments may be capable of
automatically performing some of the tests specified in Clause 6 (e.g., emission bandwidth, PSD). Such
instruments can be used instead of general purpose instruments (spectrum analyzers, signal analyzers, etc.).
use of particular carriers and timeslots as required by tests of Clause 7 and Clause 8. An example
implementation is provided of one such multicarrier interference generator.
While the tests described in this standard are based on general-purpose instrumentation, tests using
alternative, more specialized instrumentation can, in some cases, be performed more quickly with equally
valid results. For some EUTs (e.g., those operating in conformance with an industry standard air interface),
instruments may be available that are specifically designed to test equipment using a particular type of
modulation, frequency channelization, frame structure, etc. Those instruments may be capable of
automatically performing some of the tests specified in Clause 6 (e.g., emission bandwidth, PSD). Such
instruments can be used instead of general purpose instruments (spectrum analyzers, signal analyzers, etc.).
Multicarrier interference generator
A multicarrier interference generator capable of generating continuous wave (CW) signals on any selected
combination of EUT carrier frequencies. Its exact specifications depend on the EUT, but may meet or
exceed the following:
⎯ Independently switchable (on/off) EUT carriers combined in a single 50 Ω RF output
⎯ Power output per carrier
combination of EUT carrier frequencies. Its exact specifications depend on the EUT, but may meet or
exceed the following:
⎯ Independently switchable (on/off) EUT carriers combined in a single 50 Ω RF output
⎯ Power output per carrier
≥ −35 dBm
⎯ Frequency tolerance
≤ 10% of EUT center frequency separation
⎯ Adjacent channel interference
≤ −30 dBc in EUT receiver noise bandwidth
The multicarrier interference generator may offer provisions for synchronizing with the slot timing of the
EUT in order to provide timeslot-specific blocking.
General
The tests of Clause 7 and Clause 8 often require means by which specialized interference is applied to the
EUT. For some tests, this interference must be synchronized with the frame and slot timing of the EUT. For
example, 7.5 requires interference bursts of a particular length appearing at a particular location within the
EUT’s timeslots. Subclause 7.3.4 adds the requirement that the interference profile (the interference level
on each carrier and timeslot) must be able to be changed in the frame prior to the initial transmit burst.
These requirements create challenges for the test engineer.
These challenges can be addressed by means of a multi-triggerable multicarrier signal generator.
EUT. For some tests, this interference must be synchronized with the frame and slot timing of the EUT. For
example, 7.5 requires interference bursts of a particular length appearing at a particular location within the
EUT’s timeslots. Subclause 7.3.4 adds the requirement that the interference profile (the interference level
on each carrier and timeslot) must be able to be changed in the frame prior to the initial transmit burst.
These requirements create challenges for the test engineer.
These challenges can be addressed by means of a multi-triggerable multicarrier signal generator.
generator is programmed to make carriers at a settable level on each of the RF carrriers possible for the
system. The carriers each are subdivided into timeslots whose level can be individually programmed. The
generation of each frame by the vector signal generator is synchronized to the EUT timing by means of a
frame-sync signal coming from either the EUT or the companion device, as appropriate, and applied to a
trigger input for the vector signal generator. The switching from one interference profile to another is
implemented by means of a second trigger to the vector signal generator whose source is a digital hardware
flag generated by the controller in the EUT or companion device as appropriate, depending on the presence
system. The carriers each are subdivided into timeslots whose level can be individually programmed. The
generation of each frame by the vector signal generator is synchronized to the EUT timing by means of a
frame-sync signal coming from either the EUT or the companion device, as appropriate, and applied to a
trigger input for the vector signal generator. The switching from one interference profile to another is
implemented by means of a second trigger to the vector signal generator whose source is a digital hardware
flag generated by the controller in the EUT or companion device as appropriate, depending on the presence
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The example described here was implemented using a National Instruments PXI™-5670 RF vector signal generator.
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