Power Control of CDMA-based Cellular Communication Networks with Time-varying Stochastic Channel Uncertainties

Power Control of CDMA-based Cellular Communication Networks with Time-varying Stochastic Channel Uncertainties
Author: Sankrith Subramanian
Publisher:
Total Pages:
Release: 2009
Genre:
ISBN:
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ABSTRACT: Power control is used to ensure that each link achieves its target signal-to-interference- plus-noise ratio (SINR) to effect communication in the reverse link (uplink) of a wireless cellular communication network. In cellular systems using direct-sequence code-division multiple access (CDMA), the SINR depends inversely on the power assigned to the other users in the system, creating a nonlinear control problem. Due to the spreading of bands in CDMA based cellular communication networks, the interference in the system is mitigated. The nonlinearity now arises by the uncertain random phenomena across the radio link, causing detrimental effects to the signal power that is desired at the base station. Mobility of the terminals, along with associated random shadowing and multi-path fading present in the radio link, results in uncertainty in the channel parameters. To quantify these effects, a nonlinear MIMO discrete differential equation is built with the SINR of the radio-link as the state to analyze the behavior of the network. Controllers are designed based on analysis of this networked system, and power updates are obtained from the control law. Analysis is also provided to examine how mobility and the desired SINR regulation range affects the choice of channel update times. Realistic wireless network mobility models are used for simulation and the power control algorithm formulated from the control development is verified on this mobility model for acceptable communication.

Power Control in Wireless Cellular Networks

Power Control in Wireless Cellular Networks
Author: Mung Chiang
Publisher: Now Publishers Inc
Total Pages: 170
Release: 2008
Genre: Computers
ISBN: 1601981368
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Transmit power in wireless cellular networks is a key degree of freedom in the management of interference, energy, and connectivity. Power control in both the uplink and downlink of a cellular network has been extensively studied, especially over the last 15 years, and some of the results have enabled the continuous evolution and significant impact of the digital cellular technology. This survey provides a comprehensive discussion of the models, algorithms, analysis, and methodologies in this vast and growing literature. It starts with a taxonomy of the wide range of power control problem formulations, and progresses from the basic formulation to more sophisticated ones. When transmit power is the only set of optimization variables, algorithms for fixed SIR are presented first, before turning to their robust versions and joint SIR and power optimization. This is followed by opportunistic and non-cooperative power control. Then joint control of power together with beamforming pattern, base station assignment, spectrum allocation, and transmit schedule is surveyed one-by-one. Throughout the survey, we highlight the use of mathematical language and tools in the study of power control, including optimization theory, control theory, game theory, and linear algebra. Practical implementations of some of the algorithms in operational networks are discussed in the concluding section. As illustrated by the open problems presented at the end of most chapters, in the area of power control in cellular networks, there are still many under-explored directions and unresolved issues that remain theoretically challenging and practically important.

Space-Time Processing for CDMA Mobile Communications

Space-Time Processing for CDMA Mobile Communications
Author: Pieter van Rooyen
Publisher: Springer Science & Business Media
Total Pages: 336
Release: 2000-02-29
Genre: Computers
ISBN: 9780792377597
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Space-Time Processing for CDMA Mobile Communications is one of the first books to: bring together spatial/temporal channel models and analytic performance evaluation techniques; establish a link between smart antenna systems and advanced receiver design techniques; treat smart antennas specifically for UMTS-like communication systems, with applicable simulations and calculations; supply code with Matlab® GUI so readers can run or modify existing simulations or create new ones. The field of smart antenna technology or, more generally, space-time processing is rapidly becoming one of the most promising areas of mobile communications, especially regarding the development of the first practical third-generation mobile communication systems. The authors have addressed many of the most basic questions relating to the use of space-time processing in CDMA-based third-generation systems and have presented models for the integration of space-time processing, error correction coding, and multi-user detection techniques. Included is extensive background information on cellular systems, antenna array theory, smart antenna techniques, performance of basic space-time processors and advanced space-time processors. The book also includes an extensive simulation program written in Matlab®. The simulation code implements both the uplink and the downlink of a UMTS-like communication system. This provides multiple options for simulating system performance using a variety of channel models as well as receiver structures. Space-Time Processing for CDMA Mobile Communications will be an invaluable reference work for engineers and researchers, and a useful source for design engineers enabling them to understand the implications of adding space-time processing systems to CDMA-based communication systems.

Power Optimization of Cdma Based Tactical Networks

Power Optimization of Cdma Based Tactical Networks
Author: Muhammad Zeeshan
Publisher: LAP Lambert Academic Publishing
Total Pages: 88
Release: 2012-07
Genre:
ISBN: 9783659199127
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Wireless communication systems which employ multiple access techniques require very sensitive management of the sources. This is the key requirement because of random and frequent movement of mobile users and rapid variations in the channel. In Code Division Multiple Access (CDMA) based wireless communication systems, the most important issue on transmitter side is the power management. Intelligently controlled power heavily improves the systems performance and capacity. The requirement of power control becomes more important in tactical network which is a type of self organizing and self operating systems. The aim of this research work is to optimize the transmitted powers of mobile users in a multiuser CDMA based tactical networks. The proposed power optimization method for tactical networks is of valuable importance because it can be extended to other types of networks which are self organizing and infrastructureless. This work deals with the power optimization of multiple users of CDMA system where only peer-to-peer communication can take place due to the absence of any central unit or base station.

Fundamentals of Wireless Communication

Fundamentals of Wireless Communication
Author: David Tse
Publisher: Cambridge University Press
Total Pages: 598
Release: 2005-05-26
Genre: Computers
ISBN: 9780521845274
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This textbook takes a unified view of the fundamentals of wireless communication and explains cutting-edge concepts in a simple and intuitive way. An abundant supply of exercises make it ideal for graduate courses in electrical and computer engineering and it will also be of great interest to practising engineers.

CDMA Cellular Mobile Communications and Network Security

CDMA Cellular Mobile Communications and Network Security
Author: Man Young Rhee
Publisher: Prentice Hall
Total Pages: 0
Release: 1998
Genre: Code division multiple access
ISBN: 9780135984185
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CDMA has emerged as the leading technology for today's new generation of PCS wireless networks. This is a complete guide to designing, optimizing and securing CDMA systems.

Wireless Communications Systems and Networks

Wireless Communications Systems and Networks
Author: Mohsen Guizani
Publisher: Springer Science & Business Media
Total Pages: 722
Release: 2006-04-11
Genre: Computers
ISBN: 0306486423
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Since the early 1990s, the wireless communications field has witnessed explosive growth. The wide range of applications and existing new technologies nowadays stimulated this enormous growth and encouraged wireless applications. The new wireless networks will support heterogeneous traffic, consisting of voice, video, and data (multimedia). This necessitated looking at new wireless generation technologies and enhance its capabilities. This includes new standards, new levels of Quality of Service (QoS), new sets of protocols and architectures, noise reduction, power control, performance enhancement, link and mobility management, nomadic and wireless networks security, and ad-hoc architectures. Many of these topics are covered in this textbook. The aim of this book is research and development in the area of broadband wireless communications and sensor networks. It is intended for researchers that need to learn more and do research on these topics. But, it is assumed that the reader has some background about wireless communications and networking. In addition to background in each of the chapters, an in-depth analysis is presented to help our readers gain more R&D insights in any of these areas. The book is comprised of 22 chapters, written by a group of well-known experts in their respective fields. Many of them have great industrial experience mixed with proper academic background.