How Lumenci proved a phone was running interference cancellation it never disclosed
No datasheet says a handset cancels its own interference, and no teardown will show it. Lumenci proved it by building a test where the feature's absence would have been visible.
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Case at a Glance
Domain
Service
Client
plaintiff side
Result
Measured evidence that the device was cancelling its own interference, without ever opening it.
You cannot photograph a phone cancelling interference. You can only measure the difference it makes.
What most teams do.
What Lumenci did instead.
Built a test where the feature's absence would have shown, comparing the device against interference from its own transmission and against an uncorrelated interferer under matched RF conditions.
Why it mattered.
How It Was Done
Lumenci ran the testing in a controlled RF chamber, staffed with RF engineers who work in carrier aggregation and receiver design and who know what a measurement has to look like before an opposing expert will accept it.
The question was not whether the device performed well, but whether it performed differently against two kinds of interference. The whole test was built around isolating that difference.
The device under test sat in a freespace positioner over an ETS Lindgren broadband horn antenna, with a Rohde & Schwarz FSU spectrum analyser for measurement and a CMW500 generating the uncorrelated interferer on LTE band 66. The chamber's main antenna supplied downlink on LTE bands 12 and 66.
Four conditions were run: baseline operation, non-conflicting carrier aggregation, interference-sensitive carrier aggregation, and an uncorrelated interference condition.
Each scenario was repeated across multiple transmit-power and receive-signal levels, so the result could not be an artefact of one operating point.
Throughput, block error rate, and receiver sensitivity were captured throughout, and the separation between the self-generated and uncorrelated interference cases was consistent across the range.
What Changed for the Client
Where they stood.
Measured evidence that the handset mitigates non-linear interference, captured from outside the device
What Lumenci established.
That the performance separation held across transmit power and receive signal conditions, so the finding does not rest on a single operating point
Where it stands.
The test data and analysis are available to support the client's technical position
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What This Would Look Like for Your Matter
A scoping conversation covers the device, the behaviour you need to establish, whether it can be isolated under controlled conditions, and your deadline. You get a view of whether the behaviour is measurable before committing to a full test programme.
Frequently Asked Questions
Can you prove a device has a feature the manufacturer never documented?
Often, yes. Where a feature changes how the device performs, it can be established by designing a test in which its absence would produce a measurably different result. The evidence is the performance difference rather than a direct observation of the feature.
Why is product testing used instead of reverse engineering?
They answer different questions. Reverse engineering shows what is physically inside a device. Testing shows how it behaves. For signal processing and receiver behaviour there is often nothing to see in the silicon, and the behaviour only appears under specific RF conditions.
What is non-linear interference cancellation?
In carrier aggregation, a device's own transmission can generate non-linear interference that degrades its receiver. NLIC refers to techniques that identify and suppress that self-generated interference, preserving throughput and sensitivity during simultaneous multi-band operation.
How do you know a performance difference is caused by the feature and not something else?
By controlling everything except the variable in question. Here the device was exposed to self-generated and uncorrelated interference under matched conditions and swept across multiple RF levels, so the separation could not be explained by signal strength or a single operating point.
Does Lumenci have its own test facilities?
Yes. Testing runs in a controlled RF chamber with calibrated instrumentation, which matters because a measurement made in an uncontrolled environment is difficult to defend when the other side's expert examines it.
Can test results support an expert report?
They can, provided the methodology is documented well enough for an opposing expert to reproduce it. That is why the setup, the instrumentation, and the conditions are recorded alongside the measurements rather than only the results. Lumenci also provides expert witness testimony.