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Author: Srujana Kayathi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Srujana Kayathi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Kuldeep Singh Chauhan
Publisher:
ISBN: 9783659926020
Category :
Languages : en
Pages : 56
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Book Description
Author: Dr. RAJKUMAR L. BIRADAR
Publisher: Archers & Elevators Publishing House
ISBN: 8119385853
Category : Antiques & Collectibles
Languages : en
Pages : 85
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Book Description
Author: Vuttipol Santitewagul
Publisher:
ISBN: 9781303521362
Category : Orthogonal frequency division multiplexing
Languages : en
Pages : 97
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Book Description
Abstract: Various peak-to-average power ratio (PAPR) reduction techniques are studied and compared in terms of their performances. These techniques include Clipping technique, Selective Mapping technique, Partial Transmit Sequence technique, Dummy Sequence Insertion technique, Precoding-based technique, multi transform technique, and multi transform-DSI technique. Simulation results represent the evaluation performance of various techniques which consists of 16-QAM, 64-QAM, and 256-QAM and with difference number of FFT.
Author: SUBAHA. AHMED MAHMUDA (FEROZ.)
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659129544
Category :
Languages : de
Pages : 0
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Book Description
This book discusses the basics of an Orthogonal Frequency Division Multiplexing (OFDM) System and the several radio impairments effects to its Bit Error Rate (BER) performance. Graphical representation of Scatter plot and BER plot for different modulation Schemes, coding schemes and code rates are shown here to analyze the performance of OFDM system. The effects of different Cyclic Prefixes, Pilot channels and Inter-leaver on OFDM system are also observed. Peak-to-Average Power Ratio (PAPR) which is one of the major drawbacks of OFDM system is also discussed here along with the discussion of different PAPR reduction techniques. Finally, a new technique called "Double Companding" by means of multiple companding has been proposed to reduce the PAPR. The simulation results show that it has better performance in terms of PAPR reduction than the conventional companding scheme.
Author: Natarajan Meghanathan
Publisher: Springer Science & Business Media
ISBN: 3642315135
Category : Technology & Engineering
Languages : en
Pages : 800
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Book Description
The international conference on Advances in Computing and Information technology (ACITY 2012) provides an excellent international forum for both academics and professionals for sharing knowledge and results in theory, methodology and applications of Computer Science and Information Technology. The Second International Conference on Advances in Computing and Information technology (ACITY 2012), held in Chennai, India, during July 13-15, 2012, covered a number of topics in all major fields of Computer Science and Information Technology including: networking and communications, network security and applications, web and internet computing, ubiquitous computing, algorithms, bioinformatics, digital image processing and pattern recognition, artificial intelligence, soft computing and applications. Upon a strength review process, a number of high-quality, presenting not only innovative ideas but also a founded evaluation and a strong argumentation of the same, were selected and collected in the present proceedings, that is composed of three different volumes.
Author: Umer Ijaz Butt
Publisher: Universal-Publishers
ISBN: 159942360X
Category :
Languages : en
Pages :
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Author: Emad Yacoub Qeryaqos Al-Dalakta
Publisher:
ISBN:
Category :
Languages : en
Pages : 177
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Author: William Liu
Publisher:
ISBN: 9781490551586
Category :
Languages : en
Pages : 94
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Book Description
A major drawback of OFDM systems is its high peak-to-average power ratio (PAPR) of the transmit signal. In this book, we describe the design, working principle, advantage and disadvantage of OFDM. A comprehensive analysis of different PAPR reduction methods is presented. The DFT-Spread method, which is the most effective and efficient PAPR reduction technique, is identified. A very detailed theoretical analysis to the DFT-Spread method is provided with regard to the PAPR, both for single user case and multi-user case, with localized subcarrier mapping and distributed subcarrier mapping. For the multi-user case, the analysis is novel and has not been seen anywhere in any publications. A theoretical relationship is derived for the DFT-Spread method with distributed subcarrier mapping, which reveals the PAPR as a function of the modulation order and the number of users. In addition, a novel signal scrambling method is proposed to reduce the PAPR by using space-time block codes. Detailed simulation investigations and analyses are carried out to evaluate the PAPR performance of the DFT-Spread method and the proposed space-time block code signal scrambling method. Simulation investigation is also carried out to investigate the impact of DFT-Spread on the receiving performance.
Author: Z. Ghassemlooy
Publisher: CRC Press
ISBN: 1351833251
Category : Technology & Engineering
Languages : en
Pages : 578
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Book Description
Detailing a systems approach, Optical Wireless Communications: System and Channel Modelling with MATLAB®, is a self-contained volume that concisely and comprehensively covers the theory and technology of optical wireless communications systems (OWC) in a way that is suitable for undergraduate and graduate-level students, as well as researchers and professional engineers. Incorporating MATLAB® throughout, the authors highlight past and current research activities to illustrate optical sources, transmitters, detectors, receivers, and other devices used in optical wireless communications. They also discuss both indoor and outdoor environments, discussing how different factors—including various channel models—affect system performance and mitigation techniques. In addition, this book broadly covers crucial aspects of OWC systems: Fundamental principles of OWC Devices and systems Modulation techniques and schemes (including polarization shift keying) Channel models and system performance analysis Emerging visible light communications Terrestrial free space optics communication Use of infrared in indoor OWC One entire chapter explores the emerging field of visible light communications, and others describe techniques for using theoretical analysis and simulation to mitigate channel impact on system performance. Additional topics include wavelet denoising, artificial neural networks, and spatial diversity. Content also covers different challenges encountered in OWC, as well as outlining possible solutions and current research trends. A major attraction of the book is the presentation of MATLAB simulations and codes, which enable readers to execute extensive simulations and better understand OWC in general.
