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Multistage parallel interference cancellation (MPIC) based detectors allow to mitigate multiple access interference and intersymbol interference in direct-sequence code division multiple access (DS-CDMA) systems. Better performance is obtained when decision feedback (DF) is employed. Although MPIC and DF-MPIC have the same arithmetic complexity, DF-MPIC needs much more FPGA resources when compared...
Multiuser detection (MUD) techniques are mandatory in direct-sequence code division multiple access (DS-CDMA) systems. They allow to mitigate multiple access interference (MAI) and hence increase the capacity and allow high data rates. Multistage parallel interference cancellation (MPIC) detectors are considered serious candidates for practical implementation showing a good tradeoff between performance...
This paper addresses a low complexity multi-rate multiuser detector (MUD) for the uplink multi-carrier code division multiple access (MC-CDMA) systems. The new MUD is an iterative groupwise receiver with the assistance of soft information to refine the interference estimates to enhance the interference cancellation capability. The users are first classified into different groups according to their...
In this paper, the problem of code acquisition for spread-spectrum systems is investigated in the presence of frequency errors. The classic approach of noncoherent post detection integration (NCPDI) is contrasted with differential post detection integration (DPDI), presented in two different versions, namely DPDI-Real and DPDI-Abs, respectively, suited for fine and large frequency offsets. The differential...
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