Frequency diversity: Because the tr

Frequency diversity: Because the transmission is spread out over a larger
bandwidth, frequency-dependent transmission impairments, such as noise bursts and selective fading, have less effect on the signal.
Multipath resistance: In addition to the ability of DSSS to overcome multipath fading by frequency diversity, the chipping codes used for CDMA not only exhibit low cross correlation but also low autocorrelation.3 Therefore, a version of the signal that is delayed by more than one chip interval does not interfere with the dominant signal as much as in other multipath environments.
Privacy: Because spread spectrum is obtained by the use of noiselike signals, where each user has a unique code, privacy is inherent.
Graceful degradation: With FDMA or TDMA, a fixed number of users can access the system simultaneously. However, with CDMA, as more users access the system simultaneously, the noise level and hence the error rate increases; only gradually does the system degrade to the point of an unacceptable error rate.
Two drawbacks of CDMA cellular should also be mentioned:

Self-jamming: Unless all of the mobile users are perfectly synchronized, the arriving transmissions from multiple users will not be perfectly aligned on chip boundaries. Thus the spreading sequences of the different users are not orthogonal and there is some level of cross correlation. This is distinct from either TDMA or FDMA, in which for reasonable time or frequency guardbands, respectively, the received signals are orthogonal or nearly so.
Near-far problem: Signals closer to the receiver are received with less attenuation than signals farther away. Given the lack of complete orthogonality, the transmissions from the more remote mobile units may be more difficult to recover.