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Software helps peer into UWB, WiMedia

Posted: 22 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:TDS6000C? oscilloscope? Tektronix?

Offering a product that uses software down-conversion on its TDS6000C series of 15GHz realtime oscilloscopes, Tektronix extended the scope line's debug and analysis capabilities to include analysis of UWB (Ultra Wideband) RF and electrical signals. The new oscilloscope software application is for validating all types of UWB devices, from new generations of secure communications to consumer electronics. Dubbed TDSUWB, the software utility is available for a limited time at no cost.

Due to its infancy, performance and interoperability debugging and regulatory compliance measurements for UWB transmissions are often difficult, expensive and time-consuming.

Single-button tests
Tek's TDSUWB helps users design and debug UWB signals. Extensions for the WiMedia Alliance UWB Common Radio Platform offer single-button tests, such as automatic bandgroup detection (which is patent pending) and PSD (power spectral density) mask tests.

"UWB challenges test-and-measurement equipment," said Marv LaVoie, a Tektronix Fellow. "The high-frequency bandwidth required to test UWB places it beyond the capabilities of spectrum analyzers and virtually all oscilloscopes."

LaVoie contends, however, that Tektronix was able to leverage its fastest realtime technology, and use single-shot timing resolution, long record length and analysis techniques from its RTSAs (Real-Time Spectrum Analyzers) to create a unique UWB test approach.

"By bringing spectrum analysis through software to the TDS6000C instruments, with sufficient bandwidth to evaluate and debug UWB communication and radar in realtime, TDSUWB provides you with debug and compliance testing capabilities," LaVoie said.

The software is available as TDSUWB as well as a version called TDSUWB+WiMedia. The TDSUWB+WiMedia software provides additional capabilities over TDSUWB, focusing on testing WiMedia radio bandgroups. The TDSUWB+WiMedia software automatically identifies time frequency code (TFC). TFC is the frequency of operation and hopping sequence.

The software selects the correct PSD mask for that TFC, performs the PSD mask test, and measures channel power.

The TDSUWB+WiMedia software is expected to help accelerate the development of products based on Certified Wireless USB, and the WiMedia Alliance Common Radio Platform.

Looking at the spectrogram
The spectrogram shows the transmitting the first symbol in the band centered around 3.4GHz. It then hops and transmits the second symbol in a different 500MHz-wide band centered around 4.5GHz. It then hops to yet another 500MHz-wide band centered around 4GHz and transmits the third symbol. This is hopping sequence is known as TFC2, there are seven different TFC codes with different hopping sequences.

- Alex Mendelsohn

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