Code-Division Multiple Access

  • Don Torrieri


Multiple access is the ability of many users to communicate with each other while sharing a common transmission medium. Wireless multiple-access communications are facilitated if the transmitted signals are orthogonal or separable in some sense. Signals may be separated in time (time-division multiple access or TDMA), frequency ( frequency-division multiple access or FDMA), or code (code-division multiple access or CDMA).CDMA is realized by using spread-spectrum modulation while transmitting signals from multiple users in the same frequency band at the same time. All signals use the entire allocated spectrum, but the spreading sequences or frequency-hopping patterns differ. Information theory indicates that in an isolated cell, CDMA systems achieve the same spectral efficiency as TDMA or FDMA systems only if optimal multiuser detection is used. However, even with single-user detection, CDMA is advantageous for cellular networks because it eliminates the need for frequency and time-slot coordination among cells, allows carrier-frequency reuse in adjacent cells, and imposes no sharp upper bound on the number of users.


Power Control Multiuser Detector Successive Interference Canceller Spreading Sequence Symbol Error Probability 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Don Torrieri
    • 1
  1. 1.US Army Research LaboratoryAdelphiUSA

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