Accession Number : ADA331718
Title : A Direct-Sequence-Code Division Multiple Access/Differential Phase-Shift Keying (DS-CDMA/DPSK) Modem Design
Descriptive Note : Master thesis
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : Kara, Onder
PDF Url : ADA331718
Report Date : MAR 1997
Pagination or Media Count : 71
Abstract : The development of a differential phase-shift keying (DPSK), direct sequence, spread spectrum modem is conducted for the purpose of creating a prototype design to be implemented in a multi-user environment. In this design, a maximal length sequence of 31 chips is used to spread the information data. The multi-user performance analysis is performed by using Bit Error Rate (BER) test equipment (1645 Hewlett Packard data error analyzer). A multi-user interference cancellation circuit for two users is introduced, and measurements are performed to show its effectiveness. The design itself encompasses the selection of components and demonstrates that the preliminary operational characteristics of a spread spectrum DPSK modem scheme for CDMA application can be achieved.
Descriptors : *SATELLITE COMMUNICATIONS, *MODEMS, *PHASE SHIFT KEYERS, *MULTIPLE ACCESS, SIGNAL PROCESSING, DATA MANAGEMENT, THESES, CHIPS(ELECTRONICS), DATA RATE, DESIGN CRITERIA, LOW PASS FILTERS, SPREAD SPECTRUM, CELLULAR COMMUNICATIONS.
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE