Direct Sequence Code Division Multiple Access (DS-CDMA) is a multiple access technique that differentiates between different users by assigning unique spreading codes to them. It is widely used in communication systems because of its great bandwidth efficiency and its multiple access capabilities. DS-CDMA signals are resistant to multipath fading. Since
the spread spectrum signal occupies a large bandwidth, only a small portion of this signal will undergo fading due to multipath at any given time. Moreover, DS-CDMA can also effectively reject narrowband interference, since narrowband interference affects only a small portion of the spread spectrum signal. In this paper, the performance of a DS-CDMA system is investigated in presence of multiple-access interference (MAI) and an additive white Gaussian noise (AWGN) under the presence of partial band jamming. Two types of receivers are proposed, single user matched filter receiver (SUMF) and decorrelator receiver.