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.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    etd.pdf 1.96 Mb 00:09:04 00:04:40 00:04:05 00:02:02 00:00:10   kjlian.pdf 1.96 Mb 00:09:04 00:04:40 00:04:05 00:02:02 00:00:10

If you have questions or technical problems, please Contact DLA.