An alternative to frequency division and time division multiple access schemes is provided by code division multiple access (CDMA), which permits multiple users to transmit simultaneously over a channel while occupying the same frequency band. This is effected by assigning a unique code or signature to each user. As we will see, CDMA offers several advantages. Various schemes have been devised to generate the codes; this chapter will introduce the fundamentals of direct-sequence spread spectrum CDMA (DS-CDMA).
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