99 p. CDMA was adopted by the Telecommunications Industry Association (TIA) in 1993. In code-division multiple-access (CDMA) systems, due to non-orthogonality of the spreading codes and multipath channels, the desired signal suffers interference from other users. CDMA is a form of Direct Sequence Spread Spectrum communications. A directsequence spread spectrum (DS/SS) receiver for suppressing interference in directsequence code-division multiple-access (DS/CDMA) communication systems is introduced. Spread spectrum was developed for use by the military because it uses wideband signals that are difficult to detect and that resist attempts at jamming. Antijamming systems and their performance analysis, including average probability of error and signal-to-noise ratio, are focused in this dissertation. Performance results indicate that the proposed receiver outperforms the linear correlation receiver. ​Master of Science (Communications Engineering)