Download or read book Peak to average Power Ratio Reduction of OFDM Signals Using Pulse Shaping Techniques written by Ali Murat Cellatoğlu and published by . This book was released on 2003 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Papr Reduction in Ofdm System Using Pulse Shaping Technique written by Prakash Shahi and published by LAP Lambert Academic Publishing. This book was released on 2011-02 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal Frequency Division Multiplexing (OFDM) techniques allow the transmission of high data rates over broadband radio channels subject to multipath fading without the need for powerful channel equalization. However, they are very sensitive to nonlinear effects owing to high peak-to-average power ratio (PAPR) owned by their transmitted signals. This thesis proposes an efficient technique for reducing the PAPR of OFDM signals.The proposed technique is data-independent and, thus, does not require new processing and optimization for each transmitted OFDM block. The reduction in PAPR of the OFDM signal is obtained through a proper selection of a pulse shaping scheme that distributes the power of each modulated symbol over the OFDM block such that the average power of OFDM signal will not be far from individual symbol power. It is shown, through computer simulations, that the PAPR of pulse shaped OFDM signals approaches that of single-carrier signals.The pulse shaping schemes also take advantage of the frequency variations of the communication channel and can provide considerable performance gain in multipath fading channels

Download or read book Peak to Average Power Ratio Reduction and Pulse Shaping Techniques for OFDM Systems written by Carole Devlin and published by . This book was released on 2008 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Peak to Average Power Ratio Reduction in Ofdm Systems written by Mohammed El-Absi and published by LAP Lambert Academic Publishing. This book was released on 2011-02 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal frequency division multiplexing (OFDM) technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems of the near future. However, OFDM poses high peak-to-average power ratio (PAPR) problem, as a consequence of independently modulated carriers, that causes degradation on the error performance of the system, low efficiency of the power amplifier, and increases the complexities of the system. Reducing the PAPR can be regarded as an important issue to realize efficient and affordable communication services. This study proposes efficient PAPR reduction methods for OFDM signals by decreasing the possibility of peaks of the subcarriers signals to occur at the same time. The achieved results confirm that the proposed methods are capable of reducing the PAPR significantly and, therefore, of improving error performance of the system. The proposed methods were applied to multicarrier code division multiple access (MC-CDMA.

Download or read book A Study on the Tone Reservation Technique for Peak to Average Power Ratio Reduction in OFDM Systems written by Umer Ijaz Butt and published by Universal-Publishers. This book was released on 2010-08-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Peak to average Power Ratio Reduction Schemes for OFDM Systems written by Peng Liu and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is known that the orthogonal frequency division multiplexing (OFDM) modulation is very suitable for high-speed wireless transmission systems due to its bandwidth efficiency and ability in coping with multipath fading. However, the large peak-to-average power ratio (PAPR) of an OFDM signal limits the application of OFDM to a certain degree. The research focus of this thesis is on the study of some new PAPR reduction schemes for OFDM systems. In the first part of the thesis, we investigate the peak windowing method, the clipping method, and a combination of the two techniques with an emphasis on the performance assessment of the transmitted OFDM signal using the combination scheme. We start with the review of the two typical signal distortion techniques and point out their advantages and shortcomings. We then propose a combination scheme for the two techniques in order to overcome their drawbacks. In the proposed combination scheme, a weighting function is used to remove instantaneous signal peaks and then a hard-limiting is utilized for the reduction of the overall peak powers. A modified IDFT interpolation is developed and employed in the combination scheme to improve the interpolation precision of the time-domain OFDM signal. (Abstract shortened by UMI.).

Download or read book PAPR Reduction of OFDM Signals Using Pulse Shaping written by Yuwen Jian and published by . This book was released on 2006 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis an approach to generate the optimal pulse shaping matrix is proposed to minimize the signal distortions while keeping the PAPR reduction ability for this pulse shaping method. Numerical study has proved the PAPR reduction ability for the pulse shaping scheme. However, it is not desirable to obtain the CCDF through simulation due to its inefficiency. Thus, theoretical study is needed to analyze the PAPR for OFDM with pulse shaping. In the literature the analysis of PAPR distribution is based on the OFDM signal without pulse shaping being stationary. In this thesis, a proper transformation is applied to transform the non-stationary OFDM signal with pulse shaping into a stationary signal and the PAPR distribution is analyzed. Due to the difficulty representing PAPR distribution in close form, an upper bound for the CCDF of PAPR will be derived instead for OFDM signals with suitably choosing pulse shaping filters. Numerical study has also been carried out to test and verify our theoretical analysis results.

Download or read book Reduction of the Peak to Average Power Ratio of Orthogonal Frequency Division Multiplexing Signals Using the Clipping Technique written by Mustafa Tosun and published by . This book was released on 2003 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reducing Peak to Average Power Ratio of OFDM by Using Selected Mapping written by Wanis Mohamed and published by . This book was released on 2012 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal frequency division multiplexing (OFDM) has become the most popular modulation technique for high speed data transmission. However, high peak to average power ratio (PAPR) is a major drawback of this modulation technique, because high peak reduces the power efficiency of the RF power amplifier at transmitter. This project gives an overview of the popular OFDM reduction techniques, and indicates that selected mapping (SLM) is a promising reduction technique.

Download or read book Peak to average Ratio Reduction in Baseband Signals Using Adaptive Pulse Shaping written by Joe Abou Rjeili and published by . This book was released on 2004 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Peak to average Power Ratio Reduction of an OFDM Signal Using a Practical Selective Mapping Approach with Embedded Side information written by Benjamin Lee and published by . This book was released on 2009 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cognitive Radio Communication and Networking written by Robert Caiming Qiu and published by John Wiley & Sons. This book was released on 2012-09-10 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author presents a unified treatment of this highly interdisciplinary topic to help define the notion of cognitive radio. The book begins with addressing issues such as the fundamental system concept and basic mathematical tools such as spectrum sensing and machine learning, before moving on to more advanced concepts and discussions about the future of cognitive radio. From the fundamentals in spectrum sensing to the applications of cognitive algorithms to radio communications, and discussion of radio platforms and testbeds to show the applicability of the theory to practice, the author aims to provide an introduction to a fast moving topic for students and researchers seeking to develop a thorough understanding of cognitive radio networks. Examines basic mathematical tools before moving on to more advanced concepts and discussions about the future of cognitive radio Describe the fundamentals of cognitive radio, providing a step by step treatment of the topics to enable progressive learning Includes questions, exercises and suggestions for extra reading at the end of each chapter Topics covered in the book include: Spectrum Sensing: Basic Techniques; Cooperative Spectrum Sensing Wideband Spectrum Sensing; Agile Transmission Techniques: Orthogonal Frequency Division Multiplexing Multiple Input Multiple Output for Cognitive Radio; Convex Optimization for Cognitive Radio; Cognitive Core (I): Algorithms for Reasoning and Learning; Cognitive Core (II): Game Theory; Cognitive Radio Network IEEE 802.22: The First Cognitive Radio Wireless Regional Area Network Standard, and Radio Platforms and Testbeds.

Download or read book Peak to average Power Ratio Reduction in Multi antenna OFDM Via Multiple Signal Representation written by Christian Siegl and published by . This book was released on 2010 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Peak Power Control in Multicarrier Communications written by Simon Litsyn and published by Cambridge University Press. This book was released on 2007-01-04 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Peak signal power is an important factor in the implementation of multicarrier (MC) modulation schemes, like OFDM, in wireless and wireline communication systems. This 2007 book describes tools necessary for analyzing and controlling the peak-to-average power ratio in MC systems, and how these techniques are applied in practical designs. The author starts with an overview of multicarrier signals and basic tools and algorithms, before discussing properties of MC signals in detail: discrete and continuous maxima; statistical distribution of peak power; codes with constant peak-to-average power ratio are all covered, concluding with methods to decrease peak power in MC systems. Current knowledge, problems, methods and definitions are summarized using rigorous mathematics, with an overview of the tools for the engineer. The book is aimed at graduate students and researchers in electrical engineering, computer science and applied mathematics, and practitioners in the telecommunications industry.

Download or read book MIMO OFDM Wireless Communications with MATLAB written by Yong Soo Cho and published by John Wiley & Sons. This book was released on 2010-08-20 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: MIMO-OFDM is a key technology for next-generation cellular communications (3GPP-LTE, Mobile WiMAX, IMT-Advanced) as well as wireless LAN (IEEE 802.11a, IEEE 802.11n), wireless PAN (MB-OFDM), and broadcasting (DAB, DVB, DMB). In MIMO-OFDM Wireless Communications with MATLAB®, the authors provide a comprehensive introduction to the theory and practice of wireless channel modeling, OFDM, and MIMO, using MATLAB® programs to simulate the various techniques on MIMO-OFDM systems. One of the only books in the area dedicated to explaining simulation aspects Covers implementation to help cement the key concepts Uses materials that have been classroom-tested in numerous universities Provides the analytic solutions and practical examples with downloadable MATLAB® codes Simulation examples based on actual industry and research projects Presentation slides with key equations and figures for instructor use MIMO-OFDM Wireless Communications with MATLAB® is a key text for graduate students in wireless communications. Professionals and technicians in wireless communication fields, graduate students in signal processing, as well as senior undergraduates majoring in wireless communications will find this book a practical introduction to the MIMO-OFDM techniques. Instructor materials and MATLAB® code examples available for download at www.wiley.com/go/chomimo

Download or read book Investigation on High Spectral Efficiency Coherent Optical OFDM Transmission Systems written by Hussin Saleh Ibrahim Saied Saleh and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Orthogonal frequency division multiplexing (OFDM) belongs to multicarrier technology which is used in many broadband wired and wireless communication systems. It is used to combat multipath fading. Although, OFDM systems are complex compared to single carrier systems due to design of their transmitter and receiver and also the associated signal processing, significant benefits are achieved. Optical OFDM systems can be classified into three approaches according to the detection scheme. The approaches are direct detection optical OFDM (DDO-OFDM), coherent optical OFDM (CO-OFDM) and self coherent optical OFDM (SCO-OFDM). The most important drawbacks of CO-OFDM are the high peak-to-average power ratio (PAPR), high sensitivity to frequency offset and phase noise. The present dissertation introduces the performance of different pulse shaping techniques. Furthermore, it presents new algorithms to reduce the phase noise effects and compares the system performance with different existing algorithms. Moreover, the performance of a new system design is investigated. The provided dissertation includes four original contributions.Initially, the theoretical principles of OFDM are presented with detailing on the advantages and disadvantages of OFDM compared to the single carrier modulation technology. The theoretical fundamentals of optical OFDM and the differences between the three systems are followed. Furthermore, performance of the three existing optical OFDM systems are elaborated and compared. A square root raised-cosine pulse shaping of OFDM symbols is suggested to enhance the efficiency of CO-OFDM systems. Next, the different kinds of the phase noise effects on the OFDM signals are defined and the impact of the laser and nonlinear phase noise is reported. Different existing phase noise compensation algorithms are presented. Moreover, the modified and new phase noise compensation schemes are provided and compared. ; eng

Download or read book Peak to Average Power Ratio Control of OFDM Signals with Time Interleaved Complementary Code Phase Modulation written by Rohan C. Malthankar and published by . This book was released on 2006 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: