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
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE