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Improvement In Spectral Efficiency For Wireless Emergency Communications
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Book Synopsis Improvement in Spectral Efficiency for Wireless Emergency Communications by : Brijraj Vaghani
Download or read book Improvement in Spectral Efficiency for Wireless Emergency Communications written by Brijraj Vaghani and published by . This book was released on 2004 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cellular services have been ineffective in providing defense and disaster recovery communications, no matter how important the user is. This has led to the emergence of Wireless Priority Services for disaster communication, which dynamically prioritizes some connections. Future generation Wireless Priority Services must support a large number of calls. This can be achieved by making the system spectrally efficient. We propose to use linear, higher order modulation techniques for priority services instead of the currently deployed non-linear modulation schemes for priority and non-priority services. The proposed modulation techniques increase spectrum efficiency as needed but suffer from increased Adjacent Channel Interference and Inter Symbol Interference. This work deals with modelling of Adjacent Channel Interference and methods to reduce the same using digital filters. Finally we cite references which help explain how to incorporate the linear modulation schemes and interference minimizing filters into the existing GSM system using Software Defined Radio.
Book Synopsis Improving the Spectral Efficiency of Wireless Communication Systems Based on New Duplexing Techniques by : Shenghong Li
Download or read book Improving the Spectral Efficiency of Wireless Communication Systems Based on New Duplexing Techniques written by Shenghong Li and published by . This book was released on 2013 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improving Secrecy and Spectral Efficiency of Wireless Communications by : Nafel Alotaibi
Download or read book Improving Secrecy and Spectral Efficiency of Wireless Communications written by Nafel Alotaibi and published by . This book was released on 2017-04-07 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectrum Efficiency Improvement Techniques for Wireless Communications by : Bo Zhao
Download or read book Spectrum Efficiency Improvement Techniques for Wireless Communications written by Bo Zhao and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energy and Spectral Efficient Wireless Communications by : Guoqing Zhou
Download or read book Energy and Spectral Efficient Wireless Communications written by Guoqing Zhou and published by . This book was released on 2012 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy and spectrum are two precious commodities for wireless communications. How to improve the energy and spectrum efficiency has become two critical issues for the designs of wireless communication systems. This dissertation is devoted to the development of energy and spectral efficient wireless communications. The developed techniques can be applied to a wide range of wireless communication systems, such as wireless sensor network (WSN) designed for structure health monitoring (SHM), medium access control (MAC) for multi-user systems, and cooperative spectrum sensing in cognitive radio systems. First, to improve the energy efficiency in SHM WSN, a new ultra low power (ULP) WSN is proposed to monitor the vibration properties of structures such as buildings, bridges, and the wings and bodies of aircrafts. The new scheme integrates energy harvesting, data sensing, and wireless communication into a unified process, and it achieves significant energy savings compared to existing WSNs. Second, a cross-layer collision tolerant (CT) MAC scheme is proposed to improve energy and spectral efficiency in a multi-user system with shared medium. When two users transmit simultaneously over a shared medium, a collision happens at the receiver. Conventional MAC schemes will discard the collided signals, which result in a waste of the precious energy and spectrum resources. In our proposed CT-MAC scheme, each user transmits multiple weighted replicas of a packet at randomly selected data slots in a frame, and the indices of the selected slots are transmitted in a special collision-free position slot at the beginning of each frame. Collisions of the data slots in the MAC layer are resolved by using multiuser detection (MUD) in the PHY layer. Compared to existing schemes, the proposed CT-MAC scheme can support more simultaneous users with a higher throughput. Third, a new cooperative spectrum sensing scheme is proposed to improve the energy and spectral efficiency of a cognitive radio network. A new Slepian-Wolf coded cooperation scheme is proposed for a cognitive radio network with two secondary users (SUs) performing cooperative spectrum sensing through a fusion center (FC). The proposed scheme can achieve significant performance gains compared to existing schemes.
Book Synopsis Performance Evaluation and Spectral Efficiency Improvements for Wireless Networks with Interference by : Kasun T. Hemachandra
Download or read book Performance Evaluation and Spectral Efficiency Improvements for Wireless Networks with Interference written by Kasun T. Hemachandra and published by . This book was released on 2015 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: The demand for high data rate wireless services has grown tremendously. The demand is expected to grow further at an increased pace. The scarcity of the usable radio frequency spectrum is a major bottleneck to cater to the growing demand for high data rate wireless services. Current cellular wireless networks rely on deploying small cells as a possible solution to cater to the growing demand. However, this practice has resulted in severe co-channel interference (CCI) levels in cellular networks. The first phase of this thesis investigates the impact of CCI on relay networks and distributed antenna systems, which are included in recent wireless standards such as long-term evolution advanced (LTE-A). The analytical results derived for system performance metrics, such as the outage probability and the ergodic rate, are used to obtain valuable insights for system design. The second stage of this thesis research proposes interference reduction schemes for wireless relay networks operating in the presence of CCI and analytically investigates the performance of each scheme. The analytical results are used to obtain crucial design insights such as the feedback rate and position of the relay nodes. Another approach to compensate for the spectrum scarcity is through improving the spectral efficiency (SE) of the wireless networks. As a step towards increasing SE, recently, there has been research efforts to implement full-duplex (FD) wireless communications. The main challenge in FD is the interference on the reception by its own transmission. Recent advances in self-interference reduction schemes have made FD communications feasible for short range communications. This thesis develops a theoretical framework to study the average data rate of FD communications for short range communications using device-to-device networks.
Book Synopsis Improving Spectral Efficiency, Reliability, and Latency in Optical Wireless Communications by : Cíara McDonald
Download or read book Improving Spectral Efficiency, Reliability, and Latency in Optical Wireless Communications written by Cíara McDonald and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Emergency Communications by : Linda K. Moore
Download or read book Emergency Communications written by Linda K. Moore and published by Nova Publishers. This book was released on 2007 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heightened awareness of the integral role of the nation's wireless communications infrastructure in homeland security is bringing to the fore technical issues about public safety spectrum that have lain fallow for a number of years. This book covers issues concerning technology, the connection between technology standards and spectrum allocation, and the competition for spectrum among many users with diverse needs. The report in particular addresses two key issues that have attracted significant attention and controversy: interoperability and interference. Interoperability questions focus mainly on spectrum needs and compatible technology. Interference problems stem primarily from spectrum allocation decisions and radio-communications engineering that have combined to disrupt some public safety radio transmissions. Originally viewed by most industry stakeholders as separate topics, the two issues have, over time, coalesced into a single concern that questions different aspects of spectrum policy and technology planning.
Book Synopsis The Advancing World of Applied Electromagnetics by : Akhlesh Lakhtakia
Download or read book The Advancing World of Applied Electromagnetics written by Akhlesh Lakhtakia and published by Springer Nature. This book was released on with total page 825 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Enhancing Spectral Efficiency of M-ary PSK Modulation Through Low-Complexity LDPC Codec for Wireless Communication by : E Channaveeramma
Download or read book Enhancing Spectral Efficiency of M-ary PSK Modulation Through Low-Complexity LDPC Codec for Wireless Communication written by E Channaveeramma and published by Mohammed Abdul Sattar. This book was released on 2024-03-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless communications have evolved significantly over the past few decades, and the current scenario is characterized by a widespread variety of wireless technologies, applications, and services. Some of the key trends and developments in wireless communications include: 5G Networks: 5G networks deployed in many countries around the world, offering enhanced data rates, reduced latency, and additional capacity compared to previous generations of wireless networks. 5G networks use massive MIMO, beamforming, and network slicing to provide high- quality, high-speed wireless connectivity to users. Internet of Things: It is a network for devices connected wirelessly, which can communicate with each other and with the internet. IoT devices include smart sensors, wearables, and home automation systems, among others. Wireless technologies for example Bluetooth, Wi-Fi, and Zigbee are commonly used for IoT applications. Smart Homes and Cities: Wireless communication plays significant part in the implementation of smart-homes and cities, which use interconnected devices and sensors to improve energy efficiency, safety, and quality of life. Wi-Fi, Zigbee, and Bluetooth are the technologies connect devices and sensors to the internet and to each other wirelessly. Autonomous Vehicles: Wireless communications are critical for the development of autonomous vehicles, which rely on high-speed, low-latency wireless networks to communicate with other vehicles, infrastructure, and the cloud. 5G networks and other advanced wireless technologies are being developed to support the communication needs of autonomous vehicles. Satellite Communications: Satellites are being used increasingly for wireless communications, particularly in areas where terrestrial networks are unavailable or unreliable. Satellite communications are used for applications such as remote sensing, navigation, and communication with remote locations. Cellular networks (e.g. 5G, 4G LTE), satellite communications, and near-field communication (NFC) also fall into connectionless communication. Wireless communication systems must constantly function at faster speeds while making use of the available spectrum. Error-correcting codes, modulation techniques, and multiple access techniques are essential for achieving high spectrum efficiency. Channel codes, significant part of communication system that enhances reliability of data transmission by adding redundancy to the data. They make the receiver enabled such that it can identify and correct errors if any in the received signal owing to interference, or other impairments that affect the signal during the transmission through the channel.
Book Synopsis FCC Record by : United States. Federal Communications Commission
Download or read book FCC Record written by United States. Federal Communications Commission and published by . This book was released on 2015 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Wireless Communication and Sensor Networks by : Ashish Bagwari
Download or read book Advanced Wireless Communication and Sensor Networks written by Ashish Bagwari and published by CRC Press. This book was released on 2023-07-12 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers wireless communication, security issues, advanced wireless sensor networks (WSNs), routing protocols of WSNs with cross-layer solutions, emerging trends in the advanced WSNs, power management, distributed sensing and data gathering techniques for WSNs, WSNs security, applications, research of advanced WSNs with simulation results, and simulation tools for WSNs. Features: Covers technologies supporting advanced wireless communication systems, sensor networks, and the conceptual development of the subject Discusses advanced data gathering and sharing/ distributed sensing techniques with its business applicability Includes numerous worked-out mathematical equations and formulas, as well as essential principles including figures, illustrations, algorithms, and flow charts Provides pervasive background knowledge including both wireless communications and WSNs Covers wireless networks as well as sensor network models in detail This book is aimed at graduate students, researchers, and academics working in the field of computer science, wireless communication technology, and advanced WSNs.
Book Synopsis Spatial Spectral Efficiency Analysis for Wireless Communications by : Lei Zhang
Download or read book Spatial Spectral Efficiency Analysis for Wireless Communications written by Lei Zhang and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectrum utilization efficiency is one of the primary concerns in the design of future wireless communication systems. Most performance metrics for wireless communication systems focus on either link level capacity or network throughput while ignore the spatial property of wireless transmissions. In this dissertation, we focus on the spatial spectral utilization efficiency of wireless transmissions. We first study the spatial spectral efficiency of single-cell and multi-cell wireless relay systems using area spectral efficiency (ASE) performance metric. We then generalize the performance metric, termed as generalized area spectral efficiency (GASE), to measure the spatial spectral utilization efficiency of arbitrary wireless transmissions. In particular, we first introduce the definition of GASE by illustrating its evaluation for conventional point-to-point transmission. Then we extend the analysis to four different transmission scenarios, namely dual-hop relay transmission, three-node cooperative relay transmission, two-user X channels, and underlay cognitive radio transmission. Finally, we apply the GASE performance metric to investigate the spatial spectral efficiency of wireless network with Poisson distributed nodes and quantify the spatial spectral opportunities that could be explored with secondary cognitive systems. Our research on the spatial spectral utilization efficiency provides a new perspective on the designing of wireless communication systems, especially on the transmission power optimization and space-spectrum resource exploitation.
Book Synopsis Green Networking and Communications by : Shafiullah Khan
Download or read book Green Networking and Communications written by Shafiullah Khan and published by CRC Press. This book was released on 2013-10-29 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the information and communication technology (ICT) industry accounted for only 2 percent of global greenhouse gas emissions in 2007, the explosive increase in data traffic brought about by a rapidly growing user base of more than a billion wireless subscribers is expected to nearly double that number by 2020. It is clear that now is the time to rethink how we design and build our networks. Green Networking and Communications: ICT for Sustainability brings together leading academic and industrial researchers from around the world to discuss emerging developments in energy-efficient networking and communications. It covers the spectrum of research subjects, including methodologies and architectures for energy efficiency, energy-efficient protocols and networks, energy management, smart grid communications, and communication technologies for green solutions. Examines foraging-inspired radio-communication energy management for green multi-radio networks Considers a cross-layer approach to the design of energy-efficient wireless access networks Investigates the interplay between cooperative device-to-device communications and green LTE cellular networks Considers smart grid energy procurement for green LTE cellular networks Details smart grid networking protocols and standards Considering the spectrum of energy-efficient network components and approaches for reducing power consumption, the book is organized into three sections: Energy Efficiency and Management in Wireless Networks, Cellular Networks, and Smart Grids. It addresses many open research challenges regarding energy efficiency for IT and for wireless sensor networks, including mobile and wireless access networks, broadband access networks, home networks, vehicular networks, intelligent future wireless networks, and smart grids. It also examines emerging standards for energy-efficient protocols. Since ICT technologies touch on nearly all sectors of the economy, the concepts presented in this text offer you the opportunity to make a substantial contribution to the reduction of global greenhouse gas emissions.
Book Synopsis 6GN for Future Wireless Networks by : Ao Li
Download or read book 6GN for Future Wireless Networks written by Ao Li and published by Springer Nature. This book was released on 2023-07-07 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2-volume set constitutes the proceedings of the 5th International Conference on 6G for Future Wireless Networks, 6GN 2022, held in Harbin, China, in December 2022. The 60 full papers were selected from 194 submissions and present the state of the art and practical applications of 6G technologies. The papers are arranged thematically in tracks as follows: Resource Allocation for 6G Networks; Security and Privacy for 6G Networks; Big data mining and pattern analysis techniques for 6G Networks; Artificial intelligent techniques for 6G Networks; Mobile Edge Computing for 6G Networks; Unmanned Aerial Vehicle Communication for 6G Networks.
Book Synopsis Spectral Efficiency Enhancement Technologies for Future Reliability-Aware Wireless Communication Systems by : Qinwei He
Download or read book Spectral Efficiency Enhancement Technologies for Future Reliability-Aware Wireless Communication Systems written by Qinwei He and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. Senate. Committee on Commerce, Science, and Transportation Publisher : ISBN 13 : Total Pages :80 pages Book Rating :4.:/5 (51 download)
Book Synopsis S. 255, the Law Enforcement and Public Safety Telecommunication Empowerment Act by : United States. Congress. Senate. Committee on Commerce, Science, and Transportation
Download or read book S. 255, the Law Enforcement and Public Safety Telecommunication Empowerment Act written by United States. Congress. Senate. Committee on Commerce, Science, and Transportation and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
