Steven W. Ellingson

241 ElectroScience Laboratory
1320 Kinnear Road
Columbus, OH 43212

phone:    +1 (614) 292-5935
fax:    +1 (614) 292-7297
e-mail:   ellingson.1@osu.edu
WWW:    http://esl.eng.ohio-state.edu/people/researchers/ellingson.html

Curriculum Vitae (resume) available here (PDF format).

Quick Links

• My Work. Research Interests.
• My Past. Education, Past Employment, Other Items.
• My Students.
• Journal Papers. Papers and preprints in peer-reviewed journals.
• Papers in Review. Journal papers currently in the review process.
• Patents.
• Book Chapters.
• Conference Papers (Reviewed). Papers/presentations given.
• Workshops/Other Presentations. Papers/presentations given.
• ESL Technical Reports that I have (co)authored.
• Short Courses that I have prepared and taught.
• Informal Publications. Informal reports, memos, notes, etc.

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My Work

• Research Projects Currently Funded:
  • Matrix Channel Measurement System (MCMS), an NSF Major Research Instrumentation (MRI) project.
  • Mitigation of radio frequency interference (RFI) in radio astronomy through an NSF Advanced Technologies and Instrumentation (ATI) project.
  • Digital Receiver with Interference Suppression for Microwave Radiometry, a NASA Instrument Incubator Program (IIP) project.
  • LISA (574K PDF), L-Band Interference Surveyor/Analyzer.
  • Argus, an experimental omnidirectional radio telescope
  
  
• Some Past Projects:
  • SAX, Vector/matrix channel measurements using an 8-element array at 2.4 GHz
  • UAX, Direction finding using an 8-element array at 460 MHz.
  • Open loop forward link beamforming with diversity switching: A paper (PDF), Invention Disclosure (HTML)
  • Ultrawideband channel sounding
  • Ultra-High Field Magnetic Resonance Imaging (MRI)
  • AOA estimation using very small aperture arrays
  • Interference mitigation techniques for GPS receivers
  • Flexible, inexpensive array receiver technology, with Grant Hampson
  • PC-based, software-defined receivers
  • From the sublime to the ridiculous (invention disclosures): Efficient Estimation of Per-User Spatial Statistics in DS-CDMA Systems (HTML), A Method for In Situ Measurement of Linear Systems (HTML).

I supervise graduate and undergraduate students in EE, who serve as laboratory assistants on these projects. Also, I spend a frightning amount of time looking for new projects to keep us all gainfully employed. So much for the laid-back academic lifestyle!

Private consulting: I do some private consulting, usually on problems involving receiver design, wireless communications systems, and related issues.

Reviewing papers: I will consider reviewing papers in my areas of expertise. Please note that as a research scientist I usually do not have discretionary support available to do this on "company time". Therefore, I tend to be pretty choosy about what papers I will review. So, please do not send me papers without contacting me first.

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My Past

Ph.D., Electrical Engineering, The Ohio State University, 2000
M.S., Electrical Engineering, The Ohio State University, 1989
B.S., Electrical and Computer Engineering, Clarkson University, 1987

Employment

1997-Present:	Research Scientist	The Ohio State University
1995-1997:	Senior Systems Engineer	Raytheon E-Systems, Inc.
1993-1995:	Senior Consultant	Booz-Allen & Hamilton, Inc.
1989-1993:	Captain (final rank)	U.S. Army, Signal Corps (Active Duty)
1987-1989:	Graduate Research Associate	The Ohio State University

Other Items

• Senior Member, IEEE
• IEEE Society Memberships: Ant & Prop, Comm., Sig. Proc., and Geoscience & Remote Sensing.
• Appointed to the LOFAR Technical Advisory Committee (TAC), July 2002 - June 2004. I currently serve as chairman of this committee.
• I received a "Research Accomplishment" award from the OSU College of Engineering for research efforts in 1999.
• During September-October 1999, I was a visiting researcher at Astron / Netherlands Foundation for Research in Astronomy (NFRA) in Dwingeloo, the Netherlands during September and October to collaborate on SKA.
• I co-chaired (with Dennie Burnside) a "Special Session on Wireless Antenna Systems and Applications" at the 1999 IEEE Antennas & Propagation Society International Symposium in Orlando, FL, July 1999.

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My Students

Student	Went to ...	Degree, Year, Thesis
Jim Hetrick	TRW	MS, 2001, Vector Channel Measurements at 2.4 GHz
Dan Lyons	Cisco Aeronet	MS, 2001, A Novel Hybrid Smart Antenna Technique Using Subspace Beamforming and Switched Diversity for Forward Link Transmission. Received 2001 ESL Best Thesis Award.
Matt Collins	Harris	MS, 2000, A Software-Defined Radio Modem for 915 MHz: RF and Digital Transmitter Subsystems
Scott Yano	Time Domain	MS, 2000, A Novel UHF Ultrawideband Channel Sounding System
Tom Alferink	John Deere	MS, 2000, A Digital Signal Processing Engine for a Large Antenna Array
Emarit Ranu	(A T&M Firm)	MS, 2000, A Wideband UHF Downconverter with 5:1 Tuning Range
Hyung Joon Kim	OSU/PhD	MS, 1999, An Experimental System for Low-SNR Direction Finding at L-Band
Dave Schuchmann	Motorola	MS, 1999, Intelligent Data Buffer for Wideband Software Radio Applications

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Published/Accepted Journal Papers

S.W. Ellingson and G.A. Hampson, "Mitigation of Radar Interference in L-Band Radio Astronomy" (PDF), Astrophysical Journal Supplement Series, Submitted Dec 26, 2002; Accepted Feb 28, 2003; Scheduled to appear in 147(1) (July 2003).

S.W. Ellingson, "Beamforming and Interference Canceling with Very Large Wideband Arrays", IEEE Trans. Antennas and Propagation, submitted Feb 2001, revised Sep 2001, accepted Apr 2002, scheduled to appear in the April 2003 issue.

S.W. Ellingson and W. Cazemier, "Efficient Multibeam Synthesis with Interference Nulling for Large Arrays", IEEE Trans. Antennas and Propagation, submitted Jun 2000, revised Jul 2001, accepted Mar 2002, scheduled to appear in the Mar 2003 issue.

I.J. Gupta, J.R. Baxter, S.W. Ellingson, H.-G. Park, H.S. Oh, and M.G. Kyeong, "An Experimental Study of Antenna Array Calibration", IEEE Trans. Antennas and Propagation, submitted June 2001, revised (date?), accepted Feb 2002.

E. Ranu and S.W. Ellingson, "A Low-Cost Wideband UHF Downconverter with 5:1 Tuning Range", IEEE Trans. Instrumentation and Measurement, Vol. 51, No. 5, Oct 2002, pp. 1080-1084.

S.W. Ellingson and G.A. Hampson, "A Subspace-Tracking Approach to Interference Nulling for Phased Array-Based Radio Telescopes", IEEE Trans. Antennas and Propagation, Vol. 50, No. 1, Jan 2002, pp. 25-30.

S.W. Ellingson, J. Bunton, and J.F. Bell, "Removal of the GLONASS C/A Signal from OH Spectral Line Observations Using a Parametric Modelling Technique", Astrophysical Journal Supplement, Vol. 135, No. 1, pp. 87-93 (July 2001).

S.W. Ellingson, "Design and Evaluation of a Novel Antenna Array for Azimuthal Angle-of-Arrival Measurement", IEEE Trans. Antennas and Propagation, Vol. 49, No. 6, June 2001, pp. 971-979.

S.W. Ellingson, I.J. Gupta, and W.D. Burnside, "Analysis of Blended Rolled Edge Reflectors Using Numerical UTD", IEEE Trans. Antennas and Propagation, Vol. 38, No. 12, December 1990.

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Papers in Review

S.W. Ellingson, "Outdoor Measurements of Spatial Covariance at 2.4 GHz", IEEE Trans. Antennas and Propagation, Submitted December 2001.

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Patents

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Book Chapters

J. Tarter, J. Dreher, S.W. Ellingson, and W.J. Welch, "Recent Progress and Activities in the Search for Extraterrestrial Intelligence (SETI)", Chapter 36 of Review of Radio Science, 1999-2002, W. Ross Stone (Ed.), IEEE Press/John Wiley, 2002.

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Conference Papers (Reviewed)

S.W. Ellingson, G.A. Hampson, and J.T. Johnson, "Characterization of L-Band RFI and Implications for Mitigation Techniques", IEEE 2003 Intn'l Geoscience and Remote Sensing Symposium (IGARSS 2003), Toulouse, July 2003. (accepted)

S.W. Ellingson, G.A. Hampson, and J.T. Johnson, "Design of an L-Band Microwave Radiometer with Active Mitigation of Interference", IEEE 2003 Intn'l Geoscience and Remote Sensing Symposium (IGARSS 2003), Toulouse, July 2003. (accepted)

S.W. Ellingson, "Detection of Tones and Pulses using a Large, Uncalibrated Array", 2003 IEEE Antennas & Propagation Soc. Int'l Symposium, Columbus, OH, June 2003. (accepted)

S.W. Ellingson, "Effects of Angle Spread in a Complex Outdoor Environment At 2.4 GHz", 2003 IEEE Antennas & Propagation Soc. Int'l Symposium, Columbus, OH, June 2003. (accepted)

S.W. Ellingson, "Vector Channel Coherence in a Complex Outdoor Environment At 2.4 GHz", 2003 IEEE Antennas & Propagation Soc. Int'l Symposium, Columbus, OH, June 2003. (accepted)

S.W. Ellingson and G.A. Hampson, "Argus: an L-Band Array for Detection of Astronomical Transients", 2003 IEEE Antennas & Propagation Soc. Int'l Symposium, Columbus, OH, June 2003. (accepted)

I.J. Gupta and S.W. Ellingson, "Adaptive Antenna Research At the ElectroScience Laboratory," 2003 IEEE Antennas & Propagation Soc. Int'l Symposium, Columbus, OH, June 2003. (accepted)

S.W. Ellingson, "Capabilities and Limitations of Adaptive Canceling for Microwave Radiometry", IEEE 2002 Intn'l Geoscience and Remote Sensing Symposium (IGARSS 2002), Toronto, June 2002. For the paper (includes corrections to typos appearing in conference version), click here (PDF). For the presentation slides, click here (PDF).

S. Yano and S.W. Ellingson, "Design and Evaluation of a Self-Referencing UHF Ultrawideband Channel Sounder", IEEE 2001 Antennas and Propagation Society International Symposium, Boston, July 2001.

S.W. Ellingson, H.J. Kim, and K.S. Ayotte, "Low-Cost Adaptive Arrays for Analysis of Wireless Systems", 1999 IEEE Antennas & Propagation Soc. Int'l Symposium, Orlando, FL, July 1999.

S.W. Ellingson and M.P. Fitz, "A Software Radio Based System for Experimentation in Wireless Communications", 1998 IEEE Vehicular Technology Conference, Ottawa, ON, May 1998.

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Workshops / Other Presentations

S.W. Ellingson and G.A. Hampson, "Characterization & Mitigation of L-Band Ground-Based Aviation Radars", 2003 URSI National Radio Science Meeting, Columbus, OH, June 2003. (accepted)

G.A. Hampson and S.W. Ellingson, "Design of an L-Band Microwave Radiometer with Active Mitigation of Interference ", 2003 URSI National Radio Science Meeting, Columbus, OH, June 2003. (accepted)

G.R. Harp and S.W. Ellingson, "Wideband Nulling with a Single-Tap Beamformer", 2003 URSI National Radio Science Meeting, Columbus, OH, June 2003. (accepted)

G. Hampson and S. Ellingson, "Modular Digital Backends for Microwave Radiometry" (PDF), ALFA Consortium Meeting, NAIC/Arecibo Observatory, November 1, 2002.

S. Ellingson, "Antenna Arrays, Capacity, and Coherence at 2.4 GHz" (PDF presentation), April 2002.

S.W. Ellingson, "Efficient Multibeam Synthesis with Interference Nulling for Large Arrays", URSI National Radio Science Meeting, Boulder, CO, January 2002.

S.W. Ellingson and G.A. Hampson, VHF-Band RFI Measurements and Mitigation, LOFAR Workshop, MIT Haystack Observatory, October 2001.

S.W. Ellingson, RFI Detection Using an Array" (Select format and then search for my last name), International SKA Meeting, Berkeley, CA, July 2001.

S. Ellingson and J. Hetrick, "An 8-Element Dual-Frequency Array Receiver for Propagation Measurements Near 2.4 GHz", Electromagnetic Range Consortium Meeting, Columbus, OH, July 31, 2001.

S.W. Ellingson, "Limitations of Interference Beam Subtraction for Very Large Wideband Arrays", RFI Mitigation Workshop, Max Plank Institute for Radio Astronomy (MPIfR), Bonn, Germany, March 2001.

S.W. Ellingson, "Removal of the GLONASS C/A Signal from OH Spectral Line Observations using a Parametric Modeling Technique", RFI Mitigation Workshop, Max Plank Institute for Radio Astronomy (MPIfR), Bonn, Germany, March 2001. (NOTE: Superceded by ApJS paper; see above.)

S.W. Ellingson, "Smart Antenna Technologies", 2001 IEEE Workshop on New & Emerging Technologies, Rutgers University, January 18, 2001.

S.W. Ellingson, J. Bunton, and J.F. Bell, "Cancellation of the GLONASS Coarse/Acquisition Code by Parametric Modelling", Technological Pathways to the Square Kilometer Array, Jodrell Bank (UK), August 2000. (Note: Superceded by ApJS paper; see above.)

S.W. Ellingson, J. Bunton, and J.F. Bell, "Suppression of GLONASS Signals Using Parametric Signal Modelling", Workshop on Applications of Radio Science 2000, La Trobe University (Australia), 2000. (Note: Superceded by ApJS paper; see above.)

S.W. Ellingson, J. Bunton, and J.F. Bell, "Cancellation of GLONASS Signals from Radio Astronomy Data", Astronomical Telescopes and Instrumentation 2000 - Radio Telescopes, SPIE Conference 4015, Munich, March 2000, pp. 400-407. (Note: Superceded by ApJS paper; see above.)

S.W. Ellingson, "Joint Multibeaming and RFI Suppression for SKA-Class Systems", US SKA Consortium Meeting at Arecibo, Puerto Rico, February 2000.

S.W. Ellingson,  "A Parametric Approach to RFI Suppression", URSI National Radio Science Meeting, Boulder, CO, January 2000.

S.W. Ellingson, (Multiple Talks), E&F White Conference on RFI Mitigation Strategies at CSIRO/ATNF, Sydney, Australia, December 1999.

S.W. Ellingson, "RFI Suppression for Radio Astronomy: Frequency-, Time-, Space-, and Multidomain Approaches", (JCEF introduction talk) XXVI General Assembly of the Int'l URSI, Toronto, ON, August 1999.

S.W. Ellingson, "A DSP Engine for a 64-Element Array", Technologies for Large Antenna Arrays, Dwingeloo, The Netherlands, April 1999.

S.W. Ellingson and R.S. Dixon, "RFI Direction Finding and Suppression Using an Adaptive Array: Field Results", URSI National Science Meeting, Boulder, CO, January 1999.