A direct sequence - code division multiple access
By: differential phase-shift keying (DS-CDMA/DPSK) modem design
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1997
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 62
Subjects: PHASE SHIFT KEYERS; MULTIPLE ACCESS; SATELLITE COMMUNICATIONS; MODEMS
Description: 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.
Notes: Thesis advisors, Tri T. Ha, R. Clark Robertson.

AD-A331 718.

Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, March 1997.

Includes bibliographical references (p. 59-60).