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Engineers at Southwest Research Institute (SwRI) developed a receiver and mobile transmitter to measure propagation of radiowaves in the UMTS (Universal Mobile Telecommunications System) band. Most of the equipment was (commercial off-the-shelf) COTS, including arbitrary waveform generators, power amplifiers, GPS (global positioning system) timing standards, and digital receivers. The equipment was delivered in standard 19″ racks with Sun™ workstations for control and monitoring.
Custom software was developed to graphically display the received power level (over time, using a strip-chart), the power spectral density, and/or the delay spread. The transmitted signal had a chip rate of approximately 3.5 Mcps, and an adaptive Wiener filter was used to calibrate out the hardware distortion.
Four separate antennas were used on both the transmitter and the receiver. Each receiver antenna had a completely independent RF down-converter and digitizer. This configuration enabled the analysts to study the benefits of spatial diversity.
For more information about radiowave propagation measurement suite capabilities at SwRI or how you can contract with SwRI, please contact Mike Pilcher at mpilcher@swri.org or (210) 522-2083. We can offer you the best approach for solving your communications engineering problem. |
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| Communications and Embedded Systems Department | Automation and Data Systems Division | SwRI Home | |
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Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions. |
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June 10, 2008 |
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