Orthogonal Frequency Division Multiple Access Fundamentals and Applications

Orthogonal Frequency Division Multiple Access Fundamentals and Applications
Author: Tao Jiang
Publisher: CRC Press
Total Pages: 640
Release: 2010-04-21
Genre: Computers
ISBN: 1420088254

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Supported by the expert-level advice of pioneering researchers, Orthogonal Frequency Division Multiple Access Fundamentals and Applications provides a comprehensive and accessible introduction to the foundations and applications of one of the most promising access technologies for current and future wireless networks. It includes authoritative cove

Wireless MIMO-OFDM Systems with Coherent and Non-Coherent Detection

Wireless MIMO-OFDM Systems with Coherent and Non-Coherent Detection
Author: Alexander Vanaev
Publisher: Cuvillier Verlag
Total Pages: 206
Release: 2013-02-05
Genre: Technology & Engineering
ISBN: 3736943423

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In this thesis the physical layer design of broadband MIMO-OFDM communication systems is considered taking into account the realistic multipath radio channel. The main focus is made on examining a number of coherent and non-coherent MIMO techniques both analytically and via computer simulations. Several proposals are made to assist intelligent selection of MIMO precoding and decoding algorithms. Additionally two novel improved differential transmission schemes are presented and analyzed. In dieser Arbeit wird der Entwurf der physikalischen Schicht für breitbandige MIMO-OFDM Kommunikationssysteme betrachtet. Dazu werden realistische Funkkanalmodelle mit Mehrwegeausbreitung berücksichtigt. Ein wesentlicher Schwerpunkt der Arbeit liegt auf Untersuchungen zu kohärenten und nichtkohärenten MIMO-Techniken, die sowohl analytisch als auch mit Hilfe von Computersimulationen durchgeführt werden. Es werden verschiedene Vorschläge erarbeitet, wie eine intelligente Auswahl von MIMO-Techniken zur Vorcodierung sowie zur Decodierung getroffen werden kann. Darüber hinaus werden zwei neuartige, verbesserte differentielle Übertragungsverfahren vorgestellt und analysiert.

OFDM Systems for Wireless Communications

OFDM Systems for Wireless Communications
Author: Adarsh Narasimhamurthy
Publisher: Springer Nature
Total Pages: 68
Release: 2022-06-01
Genre: Technology & Engineering
ISBN: 3031015134

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Orthogonal Frequency Division Multiplexing (OFDM) systems are widely used in the standards for digital audio/video broadcasting, WiFi and WiMax. Being a frequency-domain approach to communications, OFDM has important advantages in dealing with the frequency-selective nature of high data rate wireless communication channels. As the needs for operating with higher data rates become more pressing, OFDM systems have emerged as an effective physical-layer solution. This short monograph is intended as a tutorial which highlights the deleterious aspects of the wireless channel and presents why OFDM is a good choice as a modulation that can transmit at high data rates. The system-level approach we shall pursue will also point out the disadvantages of OFDM systems especially in the context of peak to average ratio, and carrier frequency synchronization. Finally, simulation of OFDM systems will be given due prominence. Simple MATLAB programs are provided for bit error rate simulation using a discrete-time OFDM representation. Software is also provided to simulate the effects of inter-block-interference, inter-carrier-interference and signal clipping on the error rate performance. Different components of the OFDM system are described, and detailed implementation notes are provided for the programs. The program can be downloaded here. Table of Contents: Introduction / Modeling Wireless Channels / Baseband OFDM System / Carrier Frequency Offset / Peak to Average Power Ratio / Simulation of the Performance of OFDM Systems / Conclusions

OFDM Systems for Wireless Communications

OFDM Systems for Wireless Communications
Author: Adarsh B. Narasimhamurthy
Publisher: Morgan & Claypool Publishers
Total Pages: 79
Release: 2010
Genre: Computers
ISBN: 1598297015

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Orthogonal Frequency Division Multiplexing (OFDM) systems are widely used in the standards for digital audio/video broadcasting, WiFi and WiMax. Being a frequency-domain approach to communications, OFDM has important advantages in dealing with the frequency-selective nature of high data rate wireless communication channels. As the needs for operating with higher data rates become more pressing, OFDM systems have emerged as an effective physical-layer solution. This short monograph is intended as a tutorial which highlights the deleterious aspects of the wireless channel and presents why OFDM is a good choice as a modulation that can transmit at high data rates. The system-level approach we shall pursue will also point out the disadvantages of OFDM systems especially in the context of peak to average ratio, and carrier frequency synchronization. Finally, simulation of OFDM systems will be given due prominence. Simple MATLAB programs are provided for bit error rate simulation using a discrete-time OFDM representation. Software is also provided to simulate the effects of inter-block-interference, inter-carrier-interference and signal clipping on the error rate performance. Different components of the OFDM system are described, and detailed implementation notes are provided for the programs. The program can be downloaded here. Table of Contents: Introduction / Modeling Wireless Channels / Baseband OFDM System / Carrier Frequency Offset / Peak to Average Power Ratio / Simulation of the Performance of OFDM Systems / Conclusions

6th International Conference on the Development of Biomedical Engineering in Vietnam (BME6)

6th International Conference on the Development of Biomedical Engineering in Vietnam (BME6)
Author: Toi Vo Van
Publisher: Springer
Total Pages: 873
Release: 2017-09-21
Genre: Technology & Engineering
ISBN: 9811043612

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Under the motto “Healthcare Technology for Developing Countries” this book publishes many topics which are crucial for the health care systems in upcoming countries. The topics include Cyber Medical Systems Medical Instrumentation Nanomedicine and Drug Delivery Systems Public Health Entrepreneurship This proceedings volume offers the scientific results of the 6th International Conference on the Development of Biomedical Engineering in Vietnam, held in June 2016 at Ho Chi Minh City.

On Cyclic Delay Diversity OFDM Based Channels

On Cyclic Delay Diversity OFDM Based Channels
Author: Rozhin Yousefi
Publisher:
Total Pages: 52
Release: 2012
Genre:
ISBN:

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Orthogonal Frequency Division Multiplexing, so called OFDM, has found a prominent place in various wireless systems and networks as a method of encoding data over multiple carrier frequencies. OFDM-based communication systems, however, lacking inherent diversity, are capable of benefiting from different spatial diversity schemes. One such scheme, Cyclic Delay Diversity (CDD) is a method to provide spatial diversity which can be also interpreted as a Space-Time Block Coding (STBC) step. The main idea is to add more transmit antennas at the transmitter side sending the same streams of data, though with differing time delays. In [1], the capacity of a point-to-point OFDM-based channel with CDD is derived for inputs with Gaussian and discrete constellations. In this dissertation, we use the same approach for an OFDM-based single-input single-output (SISO) two-user interference channel (IC).

OFDM Baseband Receiver Design for Wireless Communications

OFDM Baseband Receiver Design for Wireless Communications
Author: Tzi-Dar Chiueh
Publisher: John Wiley & Sons
Total Pages: 278
Release: 2008-04-15
Genre: Technology & Engineering
ISBN: 0470822481

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Orthogonal frequency-division multiplexing (OFDM) access schemes are becoming more prevalent among cellular and wireless broadband systems, accelerating the need for smaller, more energy efficient receiver solutions. Up to now the majority of OFDM texts have dealt with signal processing aspects. To address the current gap in OFDM integrated circuit (IC) instruction, Chiueh and Tsai have produced this timely text on baseband design. OFDM Baseband Receiver Design for Wireless Communications covers the gamut of OFDM technology, from theories and algorithms to architectures and circuits. Chiueh and Tsai give a concise yet comprehensive look at digital communications fundamentals before explaining modulation and signal processing algorithms in OFDM receivers. Moreover, the authors give detailed treatment of hardware issues -- from design methodology to physical IC implementation. Closes the gap between OFDM theory and implementation Enables the reader to transfer communication receiver concepts into hardware design wireless receivers with acceptable implementation loss achieve low-power designs Contains numerous figures to illustrate techniques Features concrete design examples of MC-CDMA systems and cognitive radio applications Presents theoretical discussions that focus on concepts rather than mathematical derivation Provides a much-needed single source of material from numerous papers Based on course materials for a class in digital communication IC design, this book is ideal for advanced undergraduate or post-graduate students from either VLSI design or signal processing backgrounds. New and experienced engineers in industry working on algorithms or hardware for wireless communications devices will also find this book to be a key reference.

System Design and Signal Processing for OFDM-based Wireless Communication Systems

System Design and Signal Processing for OFDM-based Wireless Communication Systems
Author: Jianhua Liu
Publisher:
Total Pages:
Release: 2004
Genre: Orthogonalization methods
ISBN:

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At the receiver, we use weighted polynomial fitting to improve the channel updating accuracy and the channel prediction effectiveness to improve the tracking accuracy for the channel response for each subpacket. P4. MIMO systems over time-varying channels. We design packet structures and devise signal processing algorithms based on these designs to address the problem of high-robustness/high-rate MIMO transmission over the time-varying channels. These designs and signal processing algorithms are based on our packet design and signal processing algorithms of P1, P2, and P3.

Orthogonal Frequency Division Multiplexing for Wireless Communications

Orthogonal Frequency Division Multiplexing for Wireless Communications
Author: Ye Geoffrey Li
Publisher: Springer Science & Business Media
Total Pages: 314
Release: 2006-05-31
Genre: Technology & Engineering
ISBN: 0387302352

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Orthogonal Frequency Division Multiplexing for Wireless Communications is an edited volume with contributions by leading authorities in the subject of OFDM. Its coverage consists of principles, important wireless topics (e.g. Synchronization, channel estimation, etc.) and techniques. Included is information for advancing wireless communication in a multipath environment with an emphasis on implementation of OFDM in base stations. Orthogonal Frequency Division Multiplexing for Wireless Communications provides a comprehensive introduction of the theory and practice of OFDM. To facilitate the readers, extensive subject indices and references are given at the end of the book. Even though each chapter is written by different experts, symbols and notations in all chapters of the book are consistent.