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Direct synthesis of WiMedia UWB signals
Sep 1, 2007 12:00 PM  By Iqbal Bawa, K. A. Muralidharan and Joan Mercade

Although UWB promises high data rates, creating these signals in the lab and preserving their signal integrity is a highly complex process. One unique method of creating UWB-WiMedia signals uses an arbitrary waveform generator (AWG), yet retains the simplicity of using a dedicated UWB chipset. RF design engineers who use this unique method of AWG-based WiMedia signal generation will have several options, including IQ-baseband, IF and direct-RF-synthesis signal-generation techniques.

The setup is easy to control and configure. A good frequency-response flatness is achieved without any predistortion in band group 1 using the Tektronix AWG 7102. Figure 4 provides the frequency spectrum of the signal captured on the Tektronix oscilloscope. This direct- synthesis implementation method provides a unique yet simple setup to generate clean, high-quality UWB-WiMedia frequency-hopping band group 1 waveforms. This implementation also provides the flexibility to add controlled interference and distortions to the UWB-WiMedia waveforms. Therefore, it has the sophistication of other AWG-based methodologies, yet retains the simplicity of using a dedicated UWB chipset to feed the device under test.

References

  1. Standard ECMA -368, 1st edition, December 2005.

  2. Multiband OFDM Physical Layer specifications release 1.1.

  3. Tektronix case study — Getting Ultra Wide Band Radio Signals to Hop: TZero Technologies Takes Advantage of Powerful Tektronix Instruments, November 2005.

ABOUT THE AUTHORS

Iqbal Bawa is an engineer in electronics and communications, currently a technical lead in Tektronix' signal sources product line. He has more than eight years of experience in the fields of digital signal processing, embedded systems and communication.

K. A. Muralidharan is an electronics & communication engineer with a post graduate diploma in marketing. He works as a marketing manager for SW applications in Tektronix' signal source product line. He has 12 years of experience in sales and marketing and has been in the T&M industry for more than five years.

Joan Mercadé is a telecommunication engineer trained by the Polytechnic University of Catalonia (UPC), Barcelona, Spain. He has worked in different areas of the T&M industry for more than 20 years in companies including Philips and Tektronix. Currently, he runs his own R&D and consulting company, Arbitrary Resources.

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