Direct Sequence Code Division Multiple Access (DS-CDMA) system is well known wireless technology. This system suffers from MAI (Multiple Access Interference) caused by Direct Sequence users. Multi-User Detection schemes were introduced to detect the users’ data in presence of MAI. Linear Multi-user Detectors and conventional Matched Filter (MF) are simulated using gold, PN and even kasami seque...

Direct Sequence Code Division Multiple Access (DS-CDMA) system is well known wireless technology. This system suffers from MAI (Multiple Access Interference) caused by Direct Sequence users. Multi-User Detection schemes were introduced to detect the users’ data in presence of MAI. Linear Multi-user Detectors and conventional Matched Filter (MF) are simulated using PN and even kasami sequences a...

In this paper, a vector channel madel is pposed and some statistical pmperties of the asymptotic efficiency of the decorrelating detector with base-station awys are investigated. It is shown that we can get gain over the conventional deamlator by employing antenna arrays and the gain i n " s as the number of antennas inneases and the angle dispersion It is also shown that we can increase the as...

In this paper an approximate decorrelating detector is analyzed on the basis of a rst order ap proximation to the inverse crosscorrelation matrix of signature waveforms The approximation is fairly accurate for systems with low crosscorrelations and is exact in the two user synchronous case We present an exact as well as approximate analysis of the bit error rate performance of this detector on ...

The decorrelating and the linear, minimum mean-squared error (MMSE) detector for asynchronous code-division multiple-access communications ideally are infinite memory-length detectors. Finite memory approximations of these detectors require the inversion of a correlation matrix whose dimension is given by the product of the number of active users and the length of the processing window. With in...

The large gaps in performance and complexity between the conventional single-user matched filter (MF) and the optimum multiuser detector motivate the search for other multiuser detectors that exhibit good performance/complexity tradeoffs [2]. This lecture examines various linear multiuser detectors. They can be implemented in a decentralized fashion where only users of interest need be demodula...

The decorrelating detector is known to elimi nate the multi access interference given that the signature sequences of the users are linearly independent at the cost of enhancing the Gaussian receiver noise In this paper we present and study the convergence of a blind adaptive decorrelating detector which is based on the observation of the available statistics The algorithm is iterative and dis ...

Direct sequence code division multiple access (DS-CDMA) is a popular wireless technology. This paper presents comparative study between linear multiuser detectors, optimal multiuser detector, and conventional single user matched filter in DS-CDMA system. Analysis and simulations are conducted in synchronous AWGN channel, and Gold sequence is used as the spreading codes. The study shows that opt...