Innovative Signal Transmission and Detection Techniques for Next Generation Cellular CDMA Systems

Successive Interference Cancellation for DS-CDMA Systems with Transmit Diversity

We introduce a new successive interference cancellation (SIC) technique for direct sequence code division multiple access (DS-CDMA) systems with transmit diversity. The transmit diversity is achieved with a sp...

Authors: Wei Li and T Aaron Gulliver

Single Carrier Cyclic Prefix-Assisted CDMA System with Frequency Domain Equalization for High Data Rate Transmission

Multiple-access interference and interfinger interference limit the capacity of conventional single-carrier DS-CDMA systems. Even though multicarrier CDMA posses the advantages of conventional CDMA and OFDM, i...

Authors: AS Madhukumar, Francois Chin, Ying-Chang Liang and Kai Yang

Overloaded CDMA Systems with Displaced Binary Signatures

We extend three types of overloaded CDMA systems, by displacing in time the binary signature sequences of these systems: (1) random spreading (PN), (2) multiple-OCDMA (MO), and (3) PN/OCDMA (PN/O). For each of...

Authors: Frederik Vanhaverbeke and Marc Moeneclaey

Design of Long Period Pseudo-Random Sequences from the Addition of -Sequences over

Pseudo-random sequence with good correlation property and large linear span is widely used in code division multiple access (CDMA) communication systems and cryptology for reliable and secure information trans...

Authors: Jian Ren

Delay Estimation in Long-Code Asynchronous DS/CDMA Systems Using Multiple Antennas

The problem of propagation delay estimation in asynchronous long-code DS-CDMA multiuser systems is addressed. Almost all the methods proposed so far in the literature for propagation delay estimation are deriv...

Authors: Marius Sirbu and Visa Koivunen

Spreading Sequence Design and Theoretical Limits for Quasisynchronous CDMA Systems

For various quasisynchronous (QS) CDMA systems such as LAS-CDMA system which emerged recently, in order to reduce or eliminate the multiple access interference and multipath interference, it is required to des...

Authors: Pingzhi Fan

Editorial

Authors: Jitendra K Tugnait, Hui Liu, Guang Gong and Tongtong Li

Rotated Walsh-Hadamard Spreading with Robust Channel Estimation for a Coded MC-CDMA System

We investigate rotated Walsh-Hadamard spreading matrices for a broadband MC-CDMA system with robust channel estimation in the synchronous downlink. The similarities between rotated spreading and signal space d...

Authors: Ronald Raulefs, Armin Dammann, Stephan Sand, Stefan Kaiser and Gunther Auer

Multilevel LDPC Codes Design for Multimedia Communication CDMA System

We design multilevel coding (MLC) with a semi-bit interleaved coded modulation (BICM) scheme based on low density parity check (LDPC) codes. Different from the traditional designs, we joined the MLC and BICM t...

Authors: Jia Hou, Yu Yi and Moon Ho Lee

Downlink Space-Frequency Preequalization Techniques for TDD MC-CDMA Mobile Radio Systems

The paper considers downlink space-frequency preequalizations techniques for time division duplex (TDD) MC-CDMA. We consider the use of antenna arrays at the base station (BS) and analytically derive different...

Authors: Adão Silva and Atílio Gameiro

Joint Performance Study of Channel Estimation and Multiuser Detection for Uplink Long-Code CDMA Systems

Although numerous channel estimation and multiuser detection approaches have appeared for long-code uplink CDMA systems, joint performance study of channel estimators and symbol detectors remains largely open....

Authors: Ping Liu and Zhengyuan Xu

Two-Stage Maximum Likelihood Estimation (TSMLE) for MT-CDMA Signals in the Indoor Environment

This paper proposes a two-stage maximum likelihood estimation (TSMLE) technique suited for multitone code division multiple access (MT-CDMA) system. Here, an analytical framework is presented in the indoor env...

Authors: Quazi Mehbubar Rahman, Abu B Sesay and Mostafa Hefnawi

Blind Direct Multiuser Detection for Uplink MC-CDMA: Performance Analysis and Robust Implementation

We consider the problem of blind (i.e., without training sequences) linear mitigation of multiple-access interference in the uplink of quasi-synchronous multicarrier code-division multiple-access (MC-CDMA) sys...

Authors: Giacinto Gelli, Luigi Paura and Francesco Verde

Coding Across Multicodes and Time in CDMA Systems Employing MMSE Multiuser Detector

When combining a multicode CDMA system with convolutional coding, two methods have been considered in the literature. In one method, coding is across time in each multicode channel while in the other the codin...

Authors: Jeongsoon Park, Jong-Han Lim and Saul B Gelfand

A Low-Complexity Blind Multiuser Receiver for Long-Code CDMA

Receivers for long-code systems are for computational reasons usually based on simple matched-filter techniques, and hence suffer from multiaccess interference. Decorrelating RAKE and MMSE receivers do not hav...

Authors: Quang Hieu Dang and Alle-Jan van der Veen

CDMA Downlink Transmission with Transmit Antenna Arrays and Power Control in Multipath Fading Channels

Wireless code-division multiple-access (CDMA) cellular downlink communications with transmit antenna arrays in multipath fading channels is studied. Various array signal processing techniques at the transmit e...

Authors: Huaiyu Dai, Laurence Mailaender and HVincent Poor

Spreading Sequence Design for Multiple Cell Synchronous DS-CDMA Systems under Total Weighted Squared Correlation Criterion

An algorithm for designing spreading sequences for an overloaded multicellular synchronous DS-CDMA system on uplink is introduced. The criterion used to measure the optimality of the design is the total weight...

Authors: Paul Cotae