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Smart Antenna via Wavefront Multiplexing

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  • Seminar Series
When Oct 01, 2012
from 01:00 PM to 02:30 PM
Where ENGR. IV Bldg., Shannon Room 54-134
Contact Name
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Donald Chang

Spatial Digital



Wavefront multiplexing (WF muxing) will enable multiple distributed low EIRP space assets to perform space communications applications with high EIRP requirements, by coherently combining radiated powers from these low EIRP space assets in receivers.  The enabled systems will feature dynamically configurable, graceful degradation, soft upgrade/transition, and better communications security. There are no requirements on altering existing space asset. The enabling technologies are implemented on up-link stations and user terminals. Propagation effects are calibrated and compensated in real time through “adaptive equalization” in wavefront  (WF) multiplexing techniques on advanced smart user terminals.

WF mux techniques are not FDM, TDM, or CDM. WF muxing is not OFDM. Antennas featuring WF muxing and demuxing taking advantages of multiple available spatial communications paths are not MIMO.



Dr. Chang is the CEO for Spatial Digital Systems (SDS) to develop smart antenna technologies that enhancing today’s wireless communications. He retired from Hughes Electronics Company in 2002 as a Chief Technologist after more than twenty years of service. He participated in many commercial and military spacecraft designs, and was responsible for a multitude of advanced communications satellite systems and spacecraft antenna initiatives. His latest focus at Hughes Electronics as the chief architect was on telecommunications for broad-band fixed IP wireless and the 3G mobile communications systems utilizing stratospheric platforms. Dr. Chang holds over 90 U.S. patents with more than 70 additional patents pending on smart antennas, digital/optical beam formers for imaging and communications. He has won multiple awards for his work related to synthesized aperture techniques and digital beam forming. He earned his Ph.D. & MSEE from Stanford University in 1978, completed his MSEE & BSEE at National Cheng-Kung University, Taiwan, in 1972 and 1969, respectively, and did his post-MS studies at Johns Hopkins University in 1973. He also graduated from Strategic Leadership Institution, Anderson School, UCLA in the summer of 2000.

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