We develop the minimum mean-squared-error (MMSE) multiuser generalized detector for nonorthogonal multipulse modulation in wireless sensor networks employed by remote sensing systems over the noncoherent additive white Gaussian noise channel. The generalized detector (GD) is constructed based on the generalized approach to signal processing in the presence of noise. We analyze the asymptotic pe...

Recent attention has been given to Nakagami-0.5 fading channel as a special case of Nakagami-m fading channel with m = 0.5 and as a worst-case (severe) fading scenario. This paper presents a study on the performance analysis of a robust multiuser detector for direct sequencecode division multiple access (DS-CDMA) systems including maximal ratio combining (MRC) receive diversity. A new M-estimat...

Enhanced genetic algorithms (GA) applied in space-time block coded (STBC)multiuser detection (MUD) systems in Rayleigh flatfading channels are reported in this paper. Firstly, an improved objective function, which is designed to help speed up the search for the optimal solution, is introduced. Secondly, a decorrelating detector (DD) and a minimum mean square error (MMSE) detector have been adde...

Direct sequence code division multiple access (DSCDMA) is a popular wireless technology. This system suffers from Multiple Access Interference (MAI) caused by Direct Sequence users and Near –far effect. Multi-User Detection schemes are used to detect the users’ data in presence of MAI and Nearfar problem. In this dissertation, we present comparative study between linear multiuser detectors and ...

Direct sequence code division multiple access (DS-CDMA) is a popular wireless technology. This system suffers from Multiple Access Interference (MAI) caused by Direct Sequence users and Near–Far effect due to different power levels received. Multi-User Detection schemes are used to detect the users’ data in the presence of MAI and Near–Far problem. In this paper, presented comparative study bet...

This paper analyzes the performance of the linear parallel interference cancellation (LPIC) multiuser detector in a synchronous multiuser communication scenario with binary signaling, nonorthogonal multiple access interference, and an additive white Gaussian noise channel. The LPIC detector has been considered in the literature lately due to its low computational complexity, potential for good ...

Multi-user receivers in asynchronous Direct Sequence Code Division Multiple Access (DS-CDMA) systems require the knowledge of several parameters such as timing delay between users. The goal of this work is to present a QHDU IDU resistant joint multi-user synchronization and detection algorithm for DSCDMA systems. The solution is based on the Conditional Maximum Likelihood (CML) estimation metho...

The diversity gain of the joint error probability (JEP) of the decorrelating decision feedback detector (D-DFD) for multiple-input multiple-output (MIMO) systems in the presence of Rician fading is considered. Upper bounds on the JEP are derived for both M-ary Phase-Shift-Keying (PSK) and M-ary Quadrature Amplitude Modulation (QAM). It is shown that the diversity gain of the D-DFD receiver in b...

A promising class of nonlinear multiuser detectors is introduced for CDMA systems. These “iterated-decision” multiuser detectors use optimized multipass algorithms to successively cancel multipleaccess interference (MAI) from received data and generate symbol decisions whose reliability increases monotonically with each iteration. They significantly outperform decorrelating detectors and linear...