Multi Carrier Code Division Multiple Access (MC-CDMA) is a well known technique for high speed wireless data transmission .Two advanced technology was included in the MC-CDMA structure, such as orthogonal frequency division multiplex (OFDM) and the code division multiple access (CDMA),so that it benefits from the robustness of OFDM against multipath environment and from the capability of multiu...

CSIM19 is the latest version of the system modeling toolkit from Mesquite Software. CSIM19 offers many features that enable a modeler to develop robust and realistic models of complex systems. These models represent the system as a collection of processes and resources; in most cases the processes mimic the behavior of the entities of the system as they compete for use of the system’s resources...

Code-division multiple-access (CDMA) multiuser detection is a kind of signal recovery problem. The main problem CDMA to estimate the original from degraded information. In detection, first-order phase transition happens. degrades estimation performance. To avoid or mitigate transition, we apply adiabatic reverse annealing (ARA) detection. ARA, introduce initial Hamiltonian, which corresponds pr...

Over the past several years there has been increased interest in wireless mobile communication systems that use code division multiple access (CDMA). The systems such us IS-95 (Direct Sequence CDMA, DS-CDMA) and UMTS (Wideband CDMA, W-CDMA) already use CDMA based techniques. On the other hand, thanks to excellent multi carrier (MC) modulation properties in the frequency selective fading radio c...

This paper reports the implementation and theoretical model for analyzing an optical CDMA/DWDM hybrid system to reduce two major problems, Inter-Symbol Interference (ISI) Four-Wave Mixing (FWM) effects improve performance of subscriber access networks by using Zero Cross-Correlation (ZCC) codes, which helps effect Multiple Access (MAI). A squeezing method is used in proposed completely suppress...

Multi-user communication traditionally uses either code division multiple access (CDMA) or time-division schemes. The chirp signals resilience to multipath and the Doppler effect makes it suitable for underwater acoustic communication. This paper presents a binary phase-coded hyperbolic frequency-modulated (BPC-HFM) multi-user proposed scheme has advantage of both linear signal, which is immune...