Broadband Spatio-Temporal Channel Sounder for the 2.4 GHz ISM BandReport as inadecuate

Broadband Spatio-Temporal Channel Sounder for the 2.4 GHz ISM Band

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This report documents the continuing research efforts of the Propagation Group at Georgia Techtowards the construction of a broadband spatio-temporal channel sounder for the Aerospace Corp.The channel sounder, a valuable research tool in radio frequency RF channel and direction findingDF measurement, was constructed from the 8-element antenna array receiver setup on loan fromAerospace Corporation to support this collaborative project. Upon completion of the 2006 portion of this on-going collaboration, the following contributionswere made to the system: The broadband pseudo-random noise generator was modified for improved operation and widerbandwidth.The vector RF signal generator was improved to be cleaner, more stable, and include onboardprogramming firmware, obviating the need for an external computer and allowing better transmitterportability.An autonomous self-powered transmitter platform was constructed. Extensive improvements were made to the RF receiver signal chain in order to compensate fornear out-of-band interference and amplifier noise.Software improvements included an SQL database interface for captured data and associatedmetadata in order to facilitate storage and retrieval. In addition to these improvements, field measurements were taken to demonstrate channel soundingoperation and direction finding in environments with copious noise and interference. Collectively,these outputs fulfill the research deliverables for the year 2006 collaborative project betweenAerospace Corporation and Georgia Tech. Future work for this ongoing collaboration will likely involve more measurements and furtherminiaturization of the array channel sounder. The ultimate goal of the research should be a singlecompact receiver box containing all RF components and analog-to-digital conversion hardware. This box could then be plugged into a network or laptop computer and an arbitrary array manifoldfor portable direction-finding and channel measurement. When coupled with the array processingsoftware developed during the 2004 and 2005 phase of this collaborative project, the end resultwill be a dynamic, portable unit capable of both spatio-temporal channel sounding and-or accurateDF location of 2.4 GHz radios in a complicated radioscape. Temporal and spatial analysis of themeasurements should be able to yield detailed data to assist in detailed channel characterization.

Propagation Group Publications -

Author: Durkin, Christopher J. - Pirkl, Ryan J. - Trzecieski, Alexander J. - Durgin, Gregory D. - -



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