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Large System Performance Of Linear Interference Suppression For Ds Cdma
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Book Synopsis Large System Performance of Linear Interference Suppression for DS-CDMA. by : Weimin Xiao
Download or read book Large System Performance of Linear Interference Suppression for DS-CDMA. written by Weimin Xiao and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of linear filtering is studied for the suppression of multiple access interference in a Direct-Sequence Code-Division Multiple Access (DS-CDMA) system with random spreading sequences. Both full-rank and reduced-rank filters are investigated. The emphasis of our study is on large system performance analysis.
Book Synopsis Linear Interference Suppression and Pulse Optimization for DS-CDMA. by :
Download or read book Linear Interference Suppression and Pulse Optimization for DS-CDMA. written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project is concerned with the applicability of adaptive linear interference suppression for DS-CDMA in a peer-to-peer network. This technique is robust with respect to extreme near-far power variations. The following topics have been studied: (1) performance in the presence of time- and frequency-selective fading, (2) reduced-rank methods for faster convergence and tracking, (3) adaptive transmitter preprocessing for interference avoidance, (4) combined coding and interference suppression, and (5) performance in the presence of mixed rate traffic. Overall, our results indicate that adaptive linear interference suppression can be made robust with respect to time-varying channels and interference. Algorithmic enhancements which improve upon the performance in a dynamically changing environment have been proposed and evaluated.
Book Synopsis Interference Suppression for DS/CDMA Systems in Non-Gaussian Impulsive Channels by : Seoyoung Lee
Download or read book Interference Suppression for DS/CDMA Systems in Non-Gaussian Impulsive Channels written by Seoyoung Lee and published by . This book was released on 1998 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation results show that the proposed detector provides remarkable performance improvements over the adaptive MD detector in a wide range of near-far situations. The proposed detector has much better near-far resistance than the adaptive MD detector. Finally, fuzzy hybrid detector combines the adaptive MD detector and the hard-limiting matched filter (HLMF) detector. The HLMF detector performs well when the additive impulsive noise significantly dominates over MAI. Simulation results indicate significant performance improvements over the adaptive MD detector alone in impulsive noise-limited environments. When MAI dominates, the fuzzy hybrid detector nearly has the same performance as the adaptive MD detector.
Book Synopsis Advances in Multiuser Detection by : Michael L. Honig
Download or read book Advances in Multiuser Detection written by Michael L. Honig and published by John Wiley & Sons. This book was released on 2009-08-31 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Timely Exploration of Multiuser Detection in Wireless Networks During the past decade, the design and development of current and emerging wireless systems have motivated many important advances in multiuser detection. This book fills an important need by providing a comprehensive overview of crucial recent developments that have occurred in this active research area. Each chapter is contributed by noted experts and is meant to serve as a self-contained treatment of the topic. Coverage includes: Linear and decision feedback methods Iterative multiuser detection and decoding Multiuser detection in the presence of channel impairments Performance analysis with random signatures and channels Joint detection methods for MIMO channels Interference avoidance methods at the transmitter Transmitter precoding methods for the MIMO downlink This book is an ideal entry point for exploring ongoing research in multiuser detection and for learning about the field's existing unsolved problems and issues. It is a valuable resource for researchers, engineers, and graduate students who are involved in the area of digital communications.
Book Synopsis Performance of a Linear Interference Canceller for a DS/CDMA Synchronous System Based on the EKF Delay Estimator by : Pilar Díaz Romero
Download or read book Performance of a Linear Interference Canceller for a DS/CDMA Synchronous System Based on the EKF Delay Estimator written by Pilar Díaz Romero and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Linear Estimation and Detection in Krylov Subspaces by : Guido K. E. Dietl
Download or read book Linear Estimation and Detection in Krylov Subspaces written by Guido K. E. Dietl and published by Springer Science & Business Media. This book was released on 2007-06-15 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses linear estimation theory, which is essential for effective signal processing. The first section offers a comprehensive overview of key methods like reduced-rank signal processing and Krylov subspace methods of numerical mathematics. Also, the relationship between statistical signal processing and numerical mathematics is presented. In the second part, the theory is applied to iterative multiuser detection receivers (Turbo equalization) which are typically desired in wireless communications systems.
Book Synopsis Interference Suppression Techniques for Multicarrier DS-CDMA. by : Weiping Xu
Download or read book Interference Suppression Techniques for Multicarrier DS-CDMA. written by Weiping Xu and published by . This book was released on 1998 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Influence of the Channel Impulsional Response Estimation on the Performance of a Linear Interference Canceller for a DS/CDMA System by : Pilar Díaz Romero
Download or read book On the Influence of the Channel Impulsional Response Estimation on the Performance of a Linear Interference Canceller for a DS/CDMA System written by Pilar Díaz Romero and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applications of Space-Time Adaptive Processing by : Richard Klemm
Download or read book Applications of Space-Time Adaptive Processing written by Richard Klemm and published by IET. This book was released on 2004-08-13 with total page 971 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text discusses various applications of space-time adaptive processing, including applications in OTH-radar, ground target tracking, STAP in real world clutter environments, jammer cancellation, superresolution, active sonar, seismics and communications. It is divided into two parts: the first dealing with the classical adaptive suppression of airborne and spacebased radar clutter, and the second comprising of miscellaneous applications in other fields such as communications, underwater sound and seismics.
Book Synopsis Semi-blind Strategies for Interference Suppression in DS-CDMA Systems by : Ryan A. Pacheco
Download or read book Semi-blind Strategies for Interference Suppression in DS-CDMA Systems written by Ryan A. Pacheco and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: QAM modulation of OFDM signals (OFDM-QAM) is a popular modulation scheme for linear communication systems because it achieves good spectral efficiency while simplifying the equalization process. This comes at the cost of requiring accurate synchronization methods in the receiver, highly stable oscillators (low phase-noise); and power inefficient transmission. This work addresses issues in these three areas. First, a new frame synchronization method is developed based on Bayesian changepoint principles. It has higher accuracy then current popular methods, can be implemented recursively, and has been tested with success on experimental data collected in a WLAN testbed. Second, phase-noise resistant communication is investigated by performing an accurate statistical analysis of self-heterodyne communication systems. The analysis can be used to accurately predict the bit error probability of such systems. Third, power efficient transmission using phase-modulation (OFDM-PM) is analyzed. The bandwidth, equivalent baseband model, and symbol error probability are investigated. We can now predict the performance of OFDM-PM systems; for a given spectral efficiency, when operating well into the threshold region of angle-demodulators., The semi-blind algorithms presented in this work attempt to improve interference suppression for a given number of training and information symbols by combining training-based and blind estimation techniques. We first derive the minimum number of training symbols the training-based least squares (LS) estimator requires for complete suppression of interference (in the noiseless case). This provides a benchmark which the semi-blind algorithms are compared against. Next, a framework for semi-blind iterative interference suppression is developed which is then used to enhance the LS estimator by adding the constant modulus and cyclostationary properties used in blind algorithms. Finally, a decision-aided (multistage) semi-blind algorithm that jointly processes the signals from all intra-cell users is presented. Simulation results indicate a significant improvement over training-based and blind estimation techniques. Application of this work is in the reverse-link of third generation short-burst asynchronous DS-CDMA systems subject to both ISI and MAI.
Book Synopsis Interference Suppression for DS-CDMA with Space and Time Diversity by : Wayne G. Phoel
Download or read book Interference Suppression for DS-CDMA with Space and Time Diversity written by Wayne G. Phoel and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally, we consider transmitter diversity for the forward link of a DS-CDMA system. Orthogonal designs, which avoid self-interference from the multiple transmitters, are compared with space-time coding, which enables a lower code rate but introduces self-interference. The receiver uses a linear MMSE filter followed by a parallel Decision-Feedback Detector to cancel self-interference. In frequency-selective fading, space-time coding can provide a significant gain over orthogonal designs.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Space-time Equalizers for Interference Suppression in DS/CDMA Systems by : Pham Van Dong
Download or read book Space-time Equalizers for Interference Suppression in DS/CDMA Systems written by Pham Van Dong and published by . This book was released on 1999 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structures and algorithms for multiuser detection and interference supression in ds-cdma systems by :
Download or read book Structures and algorithms for multiuser detection and interference supression in ds-cdma systems written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Esta tese apresenta novas estruturas e algoritmos para detecção multiusuário e supressão de interferência em sistemas DS-CDMA. São investigadas estruturas baseadas em redes neurais recorrentes para projeto de receptores com decisão realimentada e desenvolvidos algoritmos adaptativospara combater a interferência de múltiplo acesso e a interferência entre símbolos. Novos algoritmos baseados na minimização da taxa de erro de bits são examinados e generalizados para esquemas de detecção com cancelamento de interferência. Para situações onde uma seqüência de treinamento não é disponibilizada, é considerado um novo critério de projeto às cegas de receptores com restrições lineares baseado na função custo módulo constante. Algoritmos adaptativos às cegas baseados neste novo critério são usados para estimar os parâmetros de um receptor linear e do canal decomunicações. São também desenvolvidos novos mecanismos às cegas de ajuste do passo para algoritmos do tipo gradiente estocástico em receptores lineares com base no critério de mínima variância com restrições. Com base nos critérios de mínima variância e módulo constante com restrições, sãodesenvolvidos critérios de projeto às cegas para receptores com decisão realimentada e propostos algoritmos adaptativos para essas estruturas. Um novo esquema de cancelamento sucessivo de interferência baseado no conceito de arbitragem é proposto e incorporado a uma estrutura de recepção com decisão realimentada para o enlace reverso. Em seguida, o novo esquema decancelamento de interferência é combinado com uma estrutura iterativa queemprega múltiplos estágios, resultando em melhores estimativas do receptore um desempenho uniforme para os usuários. Finalmente, são apresentadasnovas estruturas de recepção com posto reduzido, baseadas em filtros FIRinterpolados e interpoladores variantes no tempo, e desenvolvidos algoritmosadaptativos às cegas e supervisionados para o novo esquema.
Book Synopsis Principles of Spread-Spectrum Communication Systems by : Don Torrieri
Download or read book Principles of Spread-Spectrum Communication Systems written by Don Torrieri and published by Springer. This book was released on 2015-04-23 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides a concise but lucid explanation of the fundamentals of spread-spectrum systems with an emphasis on theoretical principles. The choice of specific topics is tempered by the author’s judgment of their practical significance and interest to both researchers and system designers. Throughout the book, learning is facilitated by many new or streamlined derivations of the classical theory. Problems at the end of each chapter are intended to assist readers in consolidating their knowledge and to provide practice in analytical techniques. This third edition includes new coverage of topics such as CDMA networks, Acquisition and Synchronization in DS-CDMA Cellular Networks, Hopsets for FH-CDMA Ad Hoc Networks, and Implications of Information Theory, as well as updated and revised material on Central Limit Theorem, Power Spectral Density of FH/CPM Complex Envelopes, and Anticipative Adaptive-Array Algorithm for Frequency-Hopping Systems.
Book Synopsis Signal Processing for DS/CDMA and OFDM-CDMA Systems: Interference Suppression, Timing Recovery and Space-Time Processing by :
Download or read book Signal Processing for DS/CDMA and OFDM-CDMA Systems: Interference Suppression, Timing Recovery and Space-Time Processing written by and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Approach to CDMA and Interference Mitigation by : Luca Fanucci
Download or read book An Experimental Approach to CDMA and Interference Mitigation written by Luca Fanucci and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Experimental Approach to CDMA and Interference Mitigation was written with the admittedly ambitious intent of filling the gap between communication theory and VLSI implementation, and thus to provide a more general/theoretical approach to the design, development, and testing of a CDMA receiver. As a consequence, the concepts and techniques that are presented turn out to be applicable to a more general kind of digital wireless modems in terms of receiver architecture design and implementation. As the reader will easily find out, the subject of digital modem design and implementation is addressed in the book starting from a theoretical approach (supported by proper bibliographic references), and is followed by application issues, with reference to an ESA experiment assumed as a case study. A complete design flow, from specification to implementation, including testing and final verification is then presented. This leads the reader step-by-step to a thorough understanding of CDMA transmission and detection, and constitutes a practical guidance for the design of VLSI wireless mobile terminals.
