Title page for ETD etd-74181839751071


Type of Document Master's Thesis
Author Lian, Keng Jin
URN etd-74181839751071
Title Adaptive Antenna Arrays for Satellite Personal Communication Systems
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Bostian, Charles W.
Woerner, Brain D.
Pratt, Timothy J. Committee Chair
Keywords
  • none
Date of Defense 1997-01-27
Availability unrestricted
Abstract
Since about the turn of the

decade, several proposals have come forth for

personal communication services implemented

by means of multiple satellite systems. These

satellite systems are similar to current

terrestrial cellular technologies, which are still

relatively new and have numerous technical

problems associated with them. As a result,

these satellite systems will also experience

some of the similar problems. Two of such

problems are the issue of multipath and

interference. These problems may result in

significant link degradation and affect overall

capacity. To overcome this problem, adaptive

antenna arrays on handheld terminals are

proposed. This technique is believed to be

better than omni-directional antennas which

radiate in all directions. Adaptive antenna

arrays have the ability to adapt to the changing

environment and null out the interference. The

LMS algorithm was investigated and used in

the simulation of the adaptive array. The

performance of the LMS array was discussed

in detail. In the case of a multipath, an alternate

approach was proposed where a diversity

combiner is used to phase shift the multipath

and combine the Signal of Interest and

multipaths constructively.

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