Simulation of MC-DS-CDMA-system based on : multi- wavelets transform over wireless Channel

الملخص EN

CDMA is a multiplexing technique where a number of users simultaneously and asynchronously access a channel by modulating and spread their information-bearing signals with reassigned signature sequences [1].

The enormous growth of wireless services (cellular telephones, wireless LAN’s ...) during the last decade gives rise to the need for a bandwidth efficient modulation technique that can reliably transmit high data rates.

As multicarrier (MC) techniques combine good bandwidth efficiency with an immunity to channel dispersion, these techniques have received considerable attention.

To be able to support multiple users, the Multicarrier transmission technique can be combined with CDMA scheme.

Different combinations of the multicarrier transmission technique and CDMA are investigated in the context of high-rate communication over dispersive channels.

Two techniques that make use of carriers satisfying the orthogonally condition with minimum frequency separation are multicarrier CDMA.