DS-CDMA[1] is being investigated for the next generation mobile communication system. In DS-CDMA, to distinguish one user’s transmission from another, each mobile terminal modulates the information data symbols by a pseudo-noise(PN) code and the strong point of this system is that it can easily realize the multi-rate transmission. On the other hand, the transmission power increases in proportio...

The increasing ubiquity of the Internet is creating a rapidly growing demand for larger bandwidth to the home. Currently the narrowband twisted-pair access network from an optical network unit (ONU) or a central office (CO) to a customer’s premises, the socalled “last dirty mile”, is the bottleneck for Internet traffic. The increasing demand for a home/office network further necessitates a flex...

A well-known feature of the DS-CDMA technique is its small sensitivity to nonlinear distortions with respect to multicarrier systems. Indeed, when phase-shift keying (PSK) modulations are used, the single-user DS-CDMA signal is characterized by an almost constant envelope, and therefore the transmitting high-power amplifier (HPA) can work efficiently, i.e., close to the saturation, without intr...

The goal for the third generation (3G) of mobile communications system is to seamlessly integrate a wide variety of communication services. One of the most promising approaches to 3G is to combine a Wideband Code Division Multiple Access (WCDMA) air interface with the fixed network of Global System for Mobile communications (GSM). In this paper we investigate the bit error rate (BER) of a WCDMA...

his work proposes a blind adaptive reduced-rank scheme and constrained constant-modulus (CCM) adaptive algorithms for interference suppression in wireless communications systems. The proposed scheme and algorithms are based on a two-stage processing framework that consists of a transformation matrix that performs dimensionality reduction followed by a reduced-rank estimator. The complex structu...

Direct-sequence code-divisionmultiple-access (DS-CDMA) and multiple-inputmultipleoutput (MIMO) wireless networks form the physical layer of the current generation of mobile networks and are anticipated to play a key role in the next generation of mobile networks. The improvements in capacity, data-rates and robustness that these networks provide come at the cost of increasingly complex interfer...

In this paper, we consider the effect of synchronization errors on the performance of the multicarrier direct-sequence code-division multiple access (MC-DS-CDMA) system and compare the results for downlink and uplink transmission. To evaluate the effect of small synchronization errors on the BER performance of the MC-DS-CDMA system, we derive simple analytical expressions for the BER degradatio...

This paper is concerned with a new direct-sequence spread-spectrum multiple-access communication system based on the so-called residue number system (RNS) or redundant residue number system (RRNS). The system operates in a multipath fading environment, and a RAKE receiver structure with maximum ratio combining is used for demodulation. Approximations to the error probabilities are given by usin...