CDMA systems work well in conjunction with frequency division duplexing. This arrangement decouples the power control problem on the up-link and down-link, respectively.
Signal quality enhancing methods like time diversity through coding and interleaving can be applied just like with the other access methods. In spread spectrum systems, however, coding can be ``built'' in to the spreading process avoiding the loss of bandwidth associated with error protection. Additionally, CDMA lends itself naturally to the exploitation of speech pauses which make up more than half the time of a connection. If no signals are transmitted during such pauses then the instantaneous interference level is reduced and the total number of users supportable by the system can be approximately doubled.
