Based on the bestseller "3G Evolution - HSPA and LTE for mobile broadband" and reflecting the ongoing success of LTE throughout the world, this book focuses on LTE with full updates including ...LTE-Advanced to provide a complete picture of the LTE system. Overview and detailed explanations are given for the latest LTE standards for radio interface architecture, the physical layer, access procedures, broadcast, relaying, spectrum and RF characteristics, and system performance. Key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of the LTE/LTE-Advanced implementation are given. An overview of other related systems such as GSM/EDGE, HSPA, CDMA2000, and WIMAX is also provided.This book is a ‘must-have’ resource for engineers and other professionals in the telecommunications industry, working with cellular or wireless broadband technologies, giving an understanding of how to utilize the new technology in order to stay ahead of the competition.The authors of the book all work at Ericsson Research and have been deeply involved in 3G and 4G development and standardisation since the early days of 3G research. They are leading experts in the field and are today still actively contributing to the standardisation of LTE within 3GPP. Includes full details of the latest additions to the LTE Radio Access standards and technologies up to and including 3GPP Release 10Clear explanations of the role of the underlying technologies for LTE, including OFDM and MIMO Full coverage of LTE-Advanced, including LTE carrier aggregation, extended multi-antenna transmission, relaying functionality and heterogeneous deploymentsLTE radio interface architecture, physical layer, access procedures, MBMS, RF characteristics and system performance covered in detail
The open access book covers a large class of nonlinear systems with many practical engineering applications. The approach is based on the extension of linear systems theory using the Volterra series. ...In contrast to the few existing treatments, our approach highlights the algebraic structure underlying such systems and is based on Schwartz’s distributions (rather than functions). The use of distributions leads naturally to the convolution algebras of linear time-invariant systems and the ones suitable for weakly nonlinear systems emerge as simple extensions to higher order distributions, without having to resort to ad hoc operators. The result is a much-simplified notation, free of multiple integrals, a conceptual simplification, and the ability to solve the associated nonlinear differential equations in a purely algebraic way. The representation based on distributions not only becomes manifestly power series alike, but it includes power series as the description of the subclass of memory-less, time-invariant, weakly nonlinear systems. With this connection, many results from the theory of power series can be extended to the larger class of weakly nonlinear systems with memory. As a specific application, the theory is specialised to weakly nonlinear electric networks. The authors show how they can be described by a set of linear equivalent circuits which can be manipulated in the usual way. The authors include many real-world examples that occur in the design of RF and mmW analogue integrated circuits for telecommunications. The examples show how the theory can elucidate many nonlinear phenomena and suggest solutions that an approach entirely based on numerical simulations can hardly suggest. The theory is extended to weakly nonlinear time-varying systems, and the authors show examples of how time-varying electric networks allow implementing functions unfeasible with time-invariant ones. The book is primarily intended for engineering students in upper semesters and in particular for electrical engineers. Practising engineers wanting to deepen their understanding of nonlinear systems should also find it useful. The book also serves as an introduction to distributions for undergraduate students of mathematics.
Individuals with complex communication needs who use Augmentative and Alternative Communication (AAC) frequently encounter barriers that limit their ability to achieve their full potential in ...communication and in life. These barriers include access barriers (limitations in the current capabilities of the AAC user or the communication systems that they use) as well as opportunity barriers (e.g., policy, practice, knowledge/skill, and attitude barriers that extend beyond the AAC user). It is essential to consider both access and opportunity barriers when designing systems and supports for individuals who use AAC. However, often the emphasis of research and practice is on addressing issues related to access barriers with far less attention to opportunity barriers. Supporting Individuals Who Use Augmentative and Alternative Communication: Breaking Down Opportunity Barriers is the first book to focus specifically on practical strategies for breaking down opportunity barriers experienced by individuals who use AAC.
The idea of the "digital divide," the great social division between information haves and have-nots, has dominated policy debates and scholarly analysis since the 1990s. In Working-Class Network ...Society, Jack Linchuan Qiu describes a more complex social and technological reality in a newly mobile, urbanizing China. Qiu argues that as inexpensive Internet and mobile phone services become available and are closely integrated with the everyday work and life of low-income communities, they provide a critical seedbed for the emergence of a new working class of "network labor" crucial to China's economic boom. Between the haves and have-nots, writes Qiu, are the information "have-less": migrants, laid-off workers, micro-entrepreneurs, retirees, youth, and others, increasingly connected by cybercafés, prepaid service, and used mobile phones. A process of class formation has begun that has important implications for working-class network society in China and beyond. Qiu brings class back into the scholarly discussion, not as a secondary factor but as an essential dimension in our understanding of communication technology as it is shaped in the vast, industrializing society of China. Basing his analysis on his more than five years of empirical research conducted in twenty cities, Qiu examines technology and class, networked connectivity and public policy, in the context of massive urban reforms that affect the new working class disproportionately. The transformation of Chinese society, writes Qiu, is emblematic of the new technosocial reality emerging in much of the Global South.
This book primarily focuses on the design of analog and digital communication systems; and has been structured to cater to the second year engineering undergraduate students of Computer Science, ...Information Technology, Electrical Engineering and Electronics and Communication departments. For better understanding, the basics of analog communication systems are outlined before the digital communication systems section. The content of this book is also suitable for the students with little knowledge in communication systems. The book is divided into five modules for efficient presentation, and it provides numerous examples and illustrations for the detailed understanding of the subject, in a thorough manner.
Accurate positioning is a key factor for enabling innovative applications in intelligent transportation systems. Cutting-edge communication technologies make cooperative localization a promising ...approach for accurate vehicle positioning. In this paper, we first propose a ranging technique called weighted least squares double difference (WLS-DD), which is used to detect intervehicle distances based on the sharing of GPS pseudorange measurements and a weighted least squares method. It takes the carrier-to-noise ratio (CNR) of raw pseudorange measurements into consideration for mitigating noises so that it can improve the accuracy of the distance detection. We show the superiority of WLS-DD by conducting a series of field experiments. Based on intervehicle distance detection, we propose a distributed location estimate algorithm (DLEA) to improve the accuracy of vehicle positioning. The implementation of DLEA only relies on inaccurate GPS pseudorange measurements and the obtained intervehicle distances without using any reference points for positioning correction. Moreover, to evaluate the joint effect of WLS-DD and DLEA, we derive a data fitting model based on the observed distance detection bias from field experiments, which generates parameters in a variety of environments for performance evaluation. Finally, we demonstrate the effectiveness of the proposed solutions via a comprehensive simulation study.
Multibeam satellite systems have been employed to provide interactive broadband services to geographical areas under-served by terrestrial infrastructure. In this context, this paper studies joint ...multiuser linear precoding design in the forward link of fixed multibeam satellite systems. We provide a generic optimization framework for linear precoding design to handle any objective functions of data rate with general linear and nonlinear power constraints. To achieve this, an iterative algorithm which optimizes the precoding vectors and power allocation alternatingly is proposed and most importantly, the proposed algorithm is proved to always converge. The proposed optimization algorithm is also applicable to nonlinear dirty paper coding. As a special case, a more efficient algorithm is devised to find the optimal solution to the problem of maximizing the proportional fairness among served users. In addition, the aforementioned problems and algorithms are extended to the case that each terminal has multiple co-polarization or dual-polarization antennas. Simulation results demonstrate substantial performance improvement of the proposed schemes over conventional multibeam satellite systems, zero-forcing and regularized zero-forcing precoding schemes in terms of meeting the traffic demand, e.g., using real beam patterns, over twice higher throughput can be achieved compared with the conventional scheme. The performance of the proposed linear precoding scheme is also shown to be very close to the dirty paper coding.
Short range optical data links are experiencing bandwidth limitations making it very challenging to cope with the growing data transmission capacity demands. Parallel optics appears as a valid ...short-term solution. It is, however, not a viable solution in the long-term because of its complex optical packaging. Therefore, increasing effort is now put into the possibility of exploiting higher order modulation formats with increased spectral efficiency and reduced optical transceiver complexity. As these type of links are based on intensity modulation and direct detection, modulation formats relying on optical coherent detection can not be straight forwardly employed. As an alternative and more viable solution, this paper proposes the use of carrierless amplitude phase (CAP) in a novel multiband approach (MultiCAP) that achieves record spectral efficiency, increases tolerance towards dispersion and bandwidth limitations, and reduces the complexity of the transceiver. We report on numerical simulations and experimental demonstrations with capacity beyond 100 Gb/s transmission using a single externally modulated laser. In addition, an extensive comparison with conventional CAP is also provided. The reported experiment uses MultiCAP to achieve 102.4 Gb/s transmission, corresponding to a data payload of 95.2 Gb/s error free transmission by using a 7% forward error correction code. The signal is successfully recovered after 15 km of standard single mode fiber in a system limited by a 3 dB bandwidth of 14 GHz.
Telecommunications infrastructure can lead to network spillovers and has the advantages of breaking spatial barriers, reducing transaction costs, and fostering business model innovation. In this way, ...it can promote the proliferation and progress of green technology and may impact green technology innovation. This paper studies the impact of telecommunications infrastructure on green technology innovation, identifies its mechanism, and analyzes the scale, structure, and heterogeneity of its effects. This research treats the Broadband China pilot policy as a quasinatural experiment in telecommunications infrastructure and uses firm- and city-level data from 2008 to 2018 to conduct a difference-in-difference (DID) model analysis. The study finds that telecommunications infrastructure promotes green technology innovation. However, telecommunications infrastructure has a more significant impact in promoting low- rather than high-quality green technology innovation. Additionally, the results of the mediating effect analysis show that telecommunications infrastructure stimulates corporate green technology innovation by improving the level of informatization, increasing media attention and improving corporate governance. It is noteworthy that, when heterogeneity in enterprise ownership, financing constraints, and technology level is considered, non-state-owned enterprises and enterprises with low financing constraints and a high technology level are found to be more clearly affected by telecommunications infrastructure.
•The influence of telecommunications infrastructure on green technology innovation in China is investigated.•Broadband China policy is regarded as a quasi-natural experiment to conduct PSM-DID model.•Telecommunications infrastructure has promoted more low- rather than high-quality green technology innovation.•The mechanism of the effect includes informatization level, media attention and corporate governance.•Non-state-owned enterprises and enterprises with low financing constraints and high technology level are more affected.
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