A Direct-Sequence-Code Division Multiple Access/Differential Phase-Shift Keying (DS-CDMA/DPSK) Modem Design

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1997
Accession Number
ADA331718

Entities

People

  • Onder Kara

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Analyzers
  • Cancellation
  • Code Division Multiple Access
  • Detectors
  • Digital Communications
  • Digital Signal Processing
  • Electrical Engineering
  • Frequency
  • Frequency Bands
  • Frequency Division Multiple Access
  • Measurement
  • Multiple Access
  • Phase Shift
  • Signal Generators
  • Spread Spectrum
  • Test Equipment
  • Waveforms

Fields of Study

  • Engineering

Readers

  • Aerospace Test and Evaluation
  • Radio communications and signal processing.