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Multi-Antenna Enhancements for Air-to-Ground Wireless Communication Systems

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What
  • PhD Defenses
When Apr 23, 2014
from 11:30 AM to 02:00 PM
Where Engr. IV Bldg., Faraday Room 67-124
Contact Name
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Jesse Chen

 Advisor: Professor Babak Daneshrad


Abstract

The increasing demand for ubiquitous broadband connectivity in recent years has given rise to the need to provide high speed, long range communications systems on mobile airborne platforms. In order to introduce the benefits of Multiple-Input Multiple-Output (MIMO) wireless solutions into the airborne environment for maximal effect, the airborne channel must be fully understood. While there have been theoretical models proposed for the airborne channel, to date there has been very little work toward providing a practical MIMO model which has been derived from or validated by actual measurement on an airborne platform.

The work presented characterizes the practical performance gains of a MIMO system over a SISO system, in a mobile air-to-ground environment, based on data throughput and channel measurements of an airborne 4x4 MIMO-OFDM system. Experimental field trials were executed at altitudes, speeds and flight patterns approximating those of medium-altitude airborne vehicles flying over various types of terrain.  Multiple ground stations were placed in various locations in order to measure channel responses in addition to actual data throughput statistics in various local scattering scenarios. Analysis of the results indicated that significant MIMO gains in throughput and range are achievable. We also show that depending on application requirements, these MIMO-enabled gains could be converted into considerable power savings.

We also present a study of the effects of introducing MIMO-enabled signaling techniques (such as eigen beamforming, eigen beamnulling and spatial multiplexing) on the aggregate link-capacity of a system of uncoordinated point-to-point links occupying the same geographic region of operation. Captured channel realizations from the earlier channel measurement campaign were inserted into our multi-link simulation environment. Simulations were run under several representative aerial-deployment scenarios and revealed significant gains in total link capacity over a SISO-only system.

Biography

Jesse Chen received a B.S in Electrical Engineering and a B.S. in Computer Engineering from the University of California, Irvine (UCI) in 2005.  He received his M.S. in Electrical Engineering in 2008 at the University of California, Los Angeles (UCLA) where he is currently working toward his Ph.D. in Electrical Engineering with Professor Babak Daneshrad and the Wireless Integrated Systems Research (WiSR) laboratory. He has been a member of the technical staff at Silvus Technologies, Inc. since 2007 where he currently holds the title of Director of Hardware Engineering.

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