Download or read book An Enhanced Pulse Position Modulation ppm in Ultra wideband uwb Systems written by Lingxiu Chen and published by . This book was released on 2014 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance of Ultra Wideband Transmission with Pulse Position Amplitude Modulation and RAKE Reception written by and published by . This book was released on 2005 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, pulse position amplitude modulation (PPAM) has been proposed for Ultra-Wideband (UWB) communication systems. PPAM combines pulse position modulation (PPM) and pulse amplitude modulation (PAM) to provide better performance and higher system capacity with low computational complexity. A RAKE receiver can make use of the rich multipath of UWB systems to improve system performance and capacity. In this paper we present the performance of a RAKE receiver employing maximal ratio combining (MRC) in a time hopping (TH) UWB system with PPAM modulation. Performance in a practical multipath fading channel is considered. The error probability and a union bound on performance are derived for a block fading environment. Numerical results are given to illustrate the system performance.
Download or read book Modulation and Multiple Access Techniques for Ultra wideband Communication Systems written by Song Cui and published by . This book was released on 2011 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two new energy detection (ED) Ultra-Wideband (UWB) systems are proposed in this dissertation. The first one is an ED UWB system based on pulse width modulation (PWM). The bit error rate (BER) performance of this ED PWM system is slightly worse than ED pulse position modulation (PPM) system in additive white Gaussian noise (AWGN) channels. However, the BER performance of this ED PWM system surpasses that of a PPM system in multipath channels since a PWM system does not suffer cross-modulation interference (CMI) as a PPM system. In the presence of synchronization errors, the BER performance of a PWM system also surpasses that of a PPM system. The second proposed ED UWB system is based on using two pulses, which are the different-order derivatives of the Gaussian pulse, to transmitted bit 0 or 1. These pulses are appropriately chosen to separate their spectra in frequency domain. The receiver is composed of two energy detection branches and each branch has a filter which captures the signal energy of either bit 0 or 1. The outputs of two branches are subtracted from each other to generate the decision statistic and the value of this statistic is compared to a threshold to determine the transmitted bits. This system is named as acf{GFSK} system in this dissertation and it exhibits the same BER performance as a PPM system in AWGN channels. In multipath channels, a GFSK system surpasses a PPM system because it does not suffer CMI. And the BER performance of a GFSK system is better than a PPM system in the presence of synchronization errors. When a GFSK system is compared to a PWM system, it will always achieve approximately 2 dB improvement in AWGN channels, multipath channels, and in the presence synchronization errors. However, a PWM system uses lower-order derivatives of the Gaussian pulse to transmit signal, and this leads to a simple pulse generator. In this dissertation, an optimal threshold is applied to improve PPM system performance. The research results show that the application of an optimal threshold can effectively mitigate the effect of CMI and synchronization errors and achieve performance improvement. Finally, the multiple access schemes are discussed and time hopping is chosen as the multiple access scheme for PWM and GFSK systems.
Download or read book Enhancing the Bit Error Rate Performance of Ultra Wideband Systems Using Time hopping Pulse Position Modulation in Multiple Access Environments written by H. Mosa and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multiple Access in Ultra Wideband Communications Using Multiple Pulses written by F. Dowla and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple access (MA) in UWB communication is an area of active research. To date several time-division or code-division pulse amplitude modulation (PAM) or pulse position modulation (PPM) schemes have been proposed to separate multiple users in UWB communications. Conventionally, all users employ the same pulse shape and modulate the transmit pulse based on changing amplitude or position. One concern with using the same pulse for all channels is that the multiple access interference (MAI) increases as the number of users increase. This is due to increased cross-correlation between similar pulses of the different channels, raising thus the noise floor in such systems. In this paper we introduce and study the performance of a new MA scheme in the context of multiple orthogonal transmitted-reference (T-R) short duration (nsec) chirp pulses in the presence of multipath and additive white Gaussian noise (AWGN).
Download or read book Code Shift Keying Impulse Modulation for Ultra Wideband Communications written by Serhat Erküçük and published by . This book was released on 2007 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra wideband impulse radio (UWB-IR) is a promising technology that has been recently investigated for high-rate data communications and low-rate location and ranging systems. Despite its many advantages including low-cost circuitry, use of unlicensed spectrum and multipath resolving capabilities, the current implementation of UWB-IRs exhibits some problems. Firstly, the conventional UWB-IR modulation format, pulse position modulation (PPM), uses consecutive fixed pulse transmit locations that are largely affected by multipath-delayed pulses, which degrades the system performance. Secondly, increasing the data rate of the most commonly used binary PPM (BPPM) format is still an open research problem. Thirdly, periodic time-hopping (TH) codes used for multiple-access generate undesired peaks for the spectrum, which may cause increased interference levels for the systems co-existing in the same bandwidth. Considering above mentioned drawbacks of the current UWB-IRs, a new modulation format is proposed in this dissertation: Code Shift Keying (CSK) Impulse Modulation. M-ary CSK (MCSK), which can be employed by itself or combined with other UWB-IR modulations, achieves data transmission by selecting one of the M orthogonal user-specific TH codes, where these TH codes are used to randomize pulse transmit locations. While the randomized pulse transmit locations reduce the effect of multipath-delayed pulses on the system performance, the random selection of TH codes increases the effective TH code period and suppresses the undesired peaks in the spectrum. In this dissertation, CSK impulse modulation is studied in detail to quantify its performance improvement over the existing systems. Initially, MCSK is compared to M-ary PPM (MPPM) to show the advantage of randomizing pulse transmit locations over fixed locations. It is shown that MCSK can provide about 2dB performance gain over MPPM in a multipath channel. Secondly, MSCK is combined with BPPM (i.e., MCSK/BPPM) in order to increase the data rate of conventional TH-BPPM systems. It is shown that MCSK/BPPM can achieve improved system performance at increased data rate if system design parameters are properly selected. Finally, power spectral density (PSD) characteristics of MCSK based IRs are studied. It is shown that the random selection of TH codes improves the resulting PSD with respect to that of conventional UWB-IRs.
Download or read book Transmitted reference Methods in Ultra wideband Communications written by Faranak Nekoogar and published by . This book was released on 2005 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Ultra Wideband for Wireless Communications written by Homayoun Nikookar and published by Springer Science & Business Media. This book was released on 2008-10-11 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: asakta-buddhih sarvatra . jitatma vigata-sprhah . . . . naiskarmya-siddhim paramam . sannyasenadhigacchati Detached by spiritual intelligence from everything controlling the mind, without material desires, one attains the paramount perfection in cessation of re- tions by renunciation. The Bhagvad Gita (18.49) Compared to traditional carrier-based, Ultra-Wide Band (UWB), or carrier-less, systems implement new paradigms in terms of signal generation and reception. Thus, designing an UWB communication system requires the understanding of how excess bandwidth and very low transmitted powers can be used jointly to provide a reliable radio link. UWB offers systems transceiver potential for very simple implementations. Comparison between UWB and traditional narrow-band systems highlights the following features: Large bandwidth enables very fine time-space resolution for accurate lo- tion of the UWB nodes and for distributing network time stamps. Very short pulses are effectively counter-fighting the channel effect in very dense multipath environments. Data rate (number of pulses transmitted per bit) can be traded with power emission control and distance coverage. Very low power density leads to low probability of signal detection and adds security for all the layers of the communication stack. Very low power density is obtained through radio regulation emission masks; UWB systems are suitable for coexistence with already deployed narrow-band systems.
Download or read book Ultra Wideband Systems with MIMO written by Thomas Kaiser and published by John Wiley & Sons. This book was released on 2010-03-18 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Up-to-date coverage of the cutting-edge research on UWB Systems with Multiple Antennas In this book, the authors investigate the benefits of combining UWB and MIMO technologies; highlighting five aspects of this promising research field: channel capacity, space-time coding, beamforming and localization, time-reversal transmission, and UWB-MIMO relay. The book presents a systematic and in-depth discussion for each of the hot topics, providing an insight into the cutting-edge research currently undertaken. It is expected that the ideas and approaches illustrated in this book will inspire sparks for the emerging technologies in short-range high data-rate wireless communications and other related applications. Key Features: Provides a thorough coverage combining the UWB and MIMO, outlining the opportunities and benefits created by the combination of these technologies Highlights five aspects of this promising research field: channel capacity, space-time coding, beamforming and localization, time-reversal transmission, and UWB-MIMO relay Covers UWB-MIMO channel measurement and models This book will serve as an invaluable reference for academic and professional researchers in wireless communications, and graduate students. Engineers and technical professionals will also find the book insightful
Download or read book Characterization of Ultra Wideband Multiple Access Performance Using Time Hopped biorthogonal Pulse Position Modulation written by Donald J. Clabaugh and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultra Wideband Radio Frequency Identification Systems written by Faranak Nekoogar and published by Springer Science & Business Media. This book was released on 2011-09-08 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-wideband Radio Frequency Identification Systems describes the essentials of radio frequency identification (RFID)systems as well as their target markets. The book covers a study of commercially available RFID systems and characterizes their performance in terms of read range and reliability in the presence of conductive and dielectric materials. The capabilities and limitations of commercial RFID systems are reported followed by comprehensive discussions of the advantages and challenges of using ultra-wideband (UWB) technology for tag/reader communications. The book presents practical aspects of RFID system such as: EPC global and ISO standards, implementation, and target markets in a simple and easy to understand language.
Download or read book Ultra Wideband Communications written by Mohammad Abdul Matin and published by BoD – Books on Demand. This book was released on 2011-07-27 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has addressed few challenges to ensure the success of UWB technologies and covers several research areas including UWB low cost transceiver, low noise amplifier (LNA), ADC architectures, UWB filter, and high power UWB amplifiers. It is believed that this book serves as a comprehensive reference for graduate students in UWB technologies.
Download or read book Ultra Wideband Antennas and Propagation written by Ben Allen and published by John Wiley & Sons. This book was released on 2006-11-02 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing up-to-date material for UWB antennas and propagation as used in a wide variety of applications, "Ultra-wideband Antennas and Propagation for Communications, Radar and Imaging" includes fundamental theory, practical design information and extensive discussion of UWB applications from biomedical imaging, through to radar and wireless communications. An in-depth treatment of ultra-wideband signals in practical environments is given, including interference, coexistence and diversity considerations. The text includes antennas and propagation in biological media in addition to more conventional environments. The topics covered are approached with the aim of helping practising engineers to view the subject from a different angle, and to consider items as variables that were treated as constants in narrowband and wideband systems. Features tables of propagation data, photographs of antenna systems and graphs of results (e.g. radiation patterns, propagation characteristics) Covers the fundamentals of antennas and propagation, as well as offering an in-depth treatment of antenna elements and arrays for UWB systems, and UWB propagation models Provides a description of the underlying concepts for the design of antennas and arrays for conventional as well as ultra-wideband systems Draws together UWB theory by using case-studies to show applications of antennas and propagation in communication, radar and imaging systems The book highlights the unique design issues of using ultra-wideband and will serve both as an introductory text and a reference guide for designers and students alike.
Download or read book Ultra Wideband written by Boris Lembrikov and published by BoD – Books on Demand. This book was released on 2010-09-17 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra wideband technology is one of the most promising directions in the rapidly developing modern communications. Ultra wideband communication system applications include radars, wireless personal area networks, sensor networks, imaging systems and high precision positioning systems. Ultra wideband transmission is characterized by high data rate, availability of low-cost transceivers, low transmit power and low interference. The proposed book consisting of 19 chapters presents both the state-of-the-art and the latest achievements in ultra wideband communication system performance, design and components. The book is addressed to engineers and researchers who are interested in the wide range of topics related to ultra wideband communications.
Download or read book Ultra Wideband Radio Technologies for Communications Localization and Sensor Applications written by Reiner Thomä and published by BoD – Books on Demand. This book was released on 2013-03-13 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra-Wideband Radio (UWB) earmarks a new radio access philosophy and exploits several GHz of bandwidth. It promises high data rate communication over short distances as well as innovative radar sensing and localization applications with unprecedented resolution. Fields of application may be found, among others, in industry, civil engineering, surveillance and exploration, for security and safety measures, and even for medicine. The book considers the basics and algorithms as well as hardware and application issues in the field of UWB radio technology for communications, localization and sensing based on the outcome of DFG's priority-funding program "Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications (UKoLoS)".
Download or read book Pulse Design for FCC Provisioned UWB Radio Transmission written by Ashley Brent Parr and published by . This book was released on 2002 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Novel Applications of the UWB Technologies written by Boris Lembrikov and published by BoD – Books on Demand. This book was released on 2011-08-01 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra wideband (UWB) communication systems are characterized by high data rates, low cost, multipath immunity, and low power transmission. In 2002, the Federal Communication Commission (FCC) legalized low power UWB emission between 3.1 GHz and 10.6 GHz for indoor communication devices stimulating rapid development of UWB technologies and applications. The proposed book Novel Applications of the UWB Technologies consists of 5 parts and 20 chapters concerning the general problems of UWB communication systems, and novel UWB applications in personal area networks (PANs), medicine, radars and localization systems. The book will be interesting for engineers and researchers occupied in the field of UWB technology.
