Accession Number:

ADA415141

Title:

Smart Antenna in DS-CDMA Mobile Communication System Using Circular Array Technique

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

2003-03-01

Pagination or Media Count:

101.0

Abstract:

This thesis examines a circular adaptive antenna array used at the mobile station for a typical Direct Sequence Code Division Multiple Access DS-CDMA cellular mobile communications system. The primary objective is to reduce co-channel interference of a wideband CDMA cellular network under a multi-path fading environment. The authors analyzed the performance of a randomly positioned mobile terminal with a randomly orientated adaptive antenna array in the forward channel base-station to mobile of a multi-cell DS-CDMA system and established four performance boundaries. A single complex circular adaptive weight in each element channel of a circular adaptive array sufficiently processes narrowband signals. However, in order to process broadband signals, a tapped-delay line transveral filter is required. This tapped-delay line is employed because it can adjust the frequency dependent amplitude and phase. The performance of a DS-CDMA cellular system with a mobile terminal equipped with a circular array and a tapped-delay line is analyzed. It was demonstrated that the optimization process is computationally expensive and, therefore, minimum taps should be used. The results illustrate that, for a four-element circular array system, a two tapped-delay line would be sufficient to equalize the broadband signal while providing a similar performance level to that of a narrowband adaptive array system. 1 table, 49 figures, 12 refs.

Subject Categories:

  • Electrical and Electronic Equipment
  • Radiofrequency Wave Propagation
  • Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE