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| Author | : Edmund James Colli-Vignarelli |
| Publisher | : |
| Total Pages | : 546 |
| Release | : 2012 |
| Genre | : |
| ISBN | : |
| Author | : İsmail Güvenç |
| Publisher | : |
| Total Pages | : |
| Release | : 2006 |
| Genre | : |
| ISBN | : |
ABSTRACT: Ultrawideband (UWB) is one of the promising technologies for future short-range high data rate communications (e.g. for wireless personal area networks) and longer range low data rate communications (e.g. wireless sensor networks). Despite its various advantages and potentials (e.g. low-cost circuitry, unlicensed reuse of licensed spectrum, precision ranging capability etc.), UWB also has its own challenges. The goal of this dissertation is to identify and address some of those challenges, and provide a framework for practical UWB transceiver design. In this dissertation, various modulation options for UWB systems are reviewed in terms of their bit error rate (BER) performances, spectral characteristics, modem and hardware complexities, and data rates. Time hopping (TH) code designs for both synchronous (introduced an adaptive code assignment technique) and asynchronous UWB impulse radio (IR) systems are studied. An adaptive assignment of two different multiple access parameters (number of pulses per symbol and number of pulse positions per frame)is investigated again considering both synchronous and asynchronous scenarios, and a mathematical framework is developed using Gaussian approximations of interference statistics for different scenarios. Channel estimation algorithms for multiuser UWB communication systems using symbol-spaced (proposed a technique that decreases the training size), frame-spaced (proposed a pulse-discarding algorithm for enhanced estimationperformance), and chip-spaced (using least squares (LS) estimation) sampling are analyzed. A comprehensive review on multiple accessing andinterference avoidance/cancellation for IR-UWB systems is presented. BER performances of different UWB modulation schemes in the presence of timing jitter are evaluated and compared in static and multipath fading channels, and finger estimation error, effects of jitter distribution, and effects of pulse shape are investigated. A unified performance analysis approach for different IR-UWB transceiver types (stored-reference, transmitted-reference, and energy detector) employing various modulation options and operating at sub-Nyquist sampling rates is presented. The time-of-arrival (TOA) estimation performance of different searchback schemesunder optimal and suboptimal threshold settings are analyzed both for additive white Gaussian noise (AWGN) and multipath channels.
| Author | : Qiang (John) Zhang |
| Publisher | : |
| Total Pages | : 226 |
| Release | : 2008 |
| Genre | : Broadband communication systems |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2011 |
| Genre | : Metal oxide semiconductors, Complementary |
| ISBN | : |
Impulse generators play an important role in the ultra-wideband (UWB) systems. Particularly in the transmitter, impulse generator performs an interface between input data and the antenna determining the overall performance of the transmitter. After the federal communication commission (FCC) revised the rules for UWB systems usages, the design of impulse generators has been pursued and yet challenging especially using CMOS technology. In this dissertation, three impulse generators are presented with analytical explanations, simulations, and measurements. First, the design and simulation of an impulse generator using TSMC 0.18 ưm CMOS technology is presented. The operating frequency band of the impulse generator is from 3.1 to 10.6 GHz for the application of UWB communications. The structure of the impulse generator is based on the current-steering digital-to-analog converter (DAC). The impulse generator has the feature of high-tunability and easy adoption of modulations. The simulation results show that the output of the impulse generator complies with the FCC regulations and has a power consumption of 27 mW at a 50 MHz pulse repetition frequency. Secondly, an impulse generator using IBM 90 nm CMOS technology for the application of 3.1 to 10.6 GHz UWB systems is proposed. The impulse generator has a simplex architecture using novel digital circuits and a compact passive band-pass filter (BPF). The measurement results show great consistency with the simulation results. The impulse generator has a center frequency of 5.8 GHz and consumes an average power of 0.9 mW at 200 MHz pulse repetition frequency. Finally, an impulse generator using TSMC 0.13 ưm CMOS technology is presented. The operating frequency band of the transmitter is from 22 to 29 GHz for the application of UWB vehicular short-range radar (SRR). The proposed design has a pulse-modulated carrier-based architecture. The simulation results show that the power spectral density of the impulse generator output complies with the FCC regulation with a center frequency tuning range of 800 MHz. The maximum achievable output swing is 1.14 V. The measurement results also show the uniformity with simulation results verifying the work.
| Author | : Francisco Iwao Hirata Flores |
| Publisher | : |
| Total Pages | : 152 |
| Release | : 2008 |
| Genre | : |
| ISBN | : |
Recently the techniques based on Impulse Radio (IR) Ultra Wideband (UWB) have experienced a growing interest in the field of wireless systems. An efficient technique known as Transmitted Reference (TR) UWB, has gained in popularity for low and medium data rates applications such as sensor networks. This technique uses two pulses per symbol period, which are strongly correlated and separated by a well known delay (D). The reception system is composed of a wideband analog delay element and a correlator. The delay line allows making a copy of the received signal with a delay that corresponds exactly to D; the correlation is then made with these two pulses. Despite the apparent simplicity of this type of receiver, its implementation in a low power integrated circuit is not an easy task, especially the delay element which must be wideband for UWB applications. > To overcome this difficulty, a new detection method called Time Delayed Sampling and Correlation (TDSC) has been proposed recently, which will be explained in this document. It uses two analog waveform samplers activated at different times; here the delay D between pulses is applied to the control signals of the two samplers. The delay is generated in a digital way; it becomes programmable and can be used in a multi-user context (a different delay for each user for example). > This document describes the design and implementation of a CMOS prototype for a TDSC-UWB receiver based on TR-UWB detection scheme. The prototype made in CMOS 0.35mm technology, allows the validation of the new detection concept, i.e. TDSC. Thanks to this prototype, it was possible to measure a -3 dB bandwidth of around 1.1 GHz and a sampling frequency of more than 7 GHz. This allows the detection of impulse signals with an input bandwidth of 500 MHz (" 2 ns), which is the minimum bandwidth for the UWB technology.
| Author | : Sri Parameswaran |
| Publisher | : Springer London |
| Total Pages | : 225 |
| Release | : 2007-12-01 |
| Genre | : Technology & Engineering |
| ISBN | : 9781402064821 |
A successful radio system design requires detailed understanding of the characteristics of the radio signal employed in the communication system. This book provides a comprehensive overview of ultra-wideband communication, starting with the fundamental concepts underlying the UWB technology.
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : |
| Genre | : |
| ISBN | : |
During the last decade, ultra wideband (UWB) systems gained a large interest in the scientific world because of their suitability to realize among others communication systems with tremendous data rates and accurate indoor positioning and location systems. As a differing technology compared to classical narrowband radio transmission systems, UWB requires some novel approaches. Well established methods to develop and analyze narrowband transmission systems remain essentially valid but are not always well tailored or optimal to UWB systems. The need for novel approaches illuminates the reasons why there are still some uncovered topics in the literature, mainly related to the analyses of imperfections and perturbations during an UWB transmission. Consequently, this thesis attempts to cover some of these topics by theoretical studies, numerical simulations, as well as experimental verification.
| Author | : Reiner Thomä |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 514 |
| Release | : 2013-03-13 |
| Genre | : Technology & Engineering |
| ISBN | : 9535109367 |
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)".
| Author | : Arjun Bharadwaj |
| Publisher | : |
| Total Pages | : 74 |
| Release | : 2002 |
| Genre | : |
| ISBN | : |
Keywords: radiometer, covertness, impulse radio, UWB.
| Author | : Pascal Pagani |
| Publisher | : John Wiley & Sons |
| Total Pages | : 185 |
| Release | : 2013-03-04 |
| Genre | : Technology & Engineering |
| ISBN | : 1118622960 |
Ultra Wide Band (UWB) technology consists of transmitting radio signals over frequency bandwidths from 500 MHz to several GHz. Its unique characteristics may be exploited for the design of high data rate wireless communication systems, as well as localization and imaging applications. The development and optimization of such systems require a precise knowledge of the radio transmission medium. This book examines all aspects of the propagation channel for UWB systems. UWB technology is first presented, with a particular emphasis being placed on its applications, spectrum regulation issues, and the different communication techniques. The authors introduce the theoretical bases of radioelectric propagation and give an overview of the channel sounding techniques adapted for UWB signals. The two main principles of UWB channel modeling are finally exposed and illustrated: deterministic channel modeling, based on the simulation of the propagation phenomena in a given environment, and statistical channel modeling, which relies on the experimental analysis of the main channel characteristics.
