Multi-carrier code-division multiple access: Difference between revisions

Revision as of 14:41, 18 October 2014

Revision as of 10:16, 8 December 2014

Line 1:

'''Multi-Carrier Code Division Multiple Access''' ('''MC-CDMA''') is a [[multiple access]] scheme used in [[OFDM]]-based telecommunication systems, allowing the system to support multiple users at the same time over same frequency band.

MC-CDMA spreads each user symbol in the frequency ___domain. That is, each user symbol is carried over multiple parallel subcarriers, but it is phase shifted (typically 0 or 180 degrees) according to a code value. The code values differ per subcarrier and per user. The receiver combines all subcarrier signals, by weighing these to compensate varying signal strengths and undo the code shift. The receiver can separate signals of different users, because these have different (e.g. orthogonal) code values.