Scholarly Communications Project

Adaptive Antenna Arrays for Satellite Personal Communication Systems


Keng Jin Lian

Master's Thesis submitted to the Faculty of the Virginia Tech in partial fulfillment of the requirements for the degree of

Master of Science


Electrical Engineering


Dr. Timothy Pratt, Chair
Dr. Charles Bostian
Dr. Brian Woerner

January 27, 1997
Blacksburg, Virginia


ADAPTIVE ANTENNA ARRAYS FOR SATELLITE PERSONAL COMMUNICATION SYSTEMS by Keng-Jin Lian Committee Chairman: Timothy Pratt Department of Electrical Engineering 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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