Direct Sequence - Code Division Multiple Access/Binary Phase Shift Keying (DS-CDMA/BPSK) Modem Design

摘要

In this thesis, the design of a direct sequence - code division multipleaccess/binary phase-shift keying (DS-CDMA/BPSK) modem is examined. In this prototype modem design, a short maximal length sequence of 31 chips is used to spread the information data. The design can be extended to longer codes which would provide greater capacity and processing gain. The hardware used in the functional realization of a working design is also discussed, the preliminary operational characteristics of a spread spectrum BPSK modem are achieved. The multi-user performance analysis is conducted using Bit Error Rate (BER) test equipment (HP1645A). The development of the final version of the modem operating at radio frequency (RF) is not conducted, but proof of concept is provided.