Download or read book Wireless Ad Hoc Networks with Receiver Multipacket Reception Performance Analysis and Signal Processing written by and published by . This book was released on 2005 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this research is to develop new theory and techniques that significantly improve performance of ad hoc networks by advanced signal processing and medium access control (MAC). In particular, we are interested in signal processing algorithms that are capable of separating signals from multiple users therefore provide multipacket reception (MPR) at the receiver, and MAC protocols that take advantage of the MPR capability of the physical layer. During the reporting period, we investigated signal processing techniques with efficient implementation to strengthen the multiuser physical layer of ad hoc networks. We have extended our previous results to wireless sensor networks for which we considered the problem estimating the number of operating sensors and energy distribution. We also considered the problem of reconstructing random signal field using data samples collected from the sensor field. Blind and semi-blind channel estimation and symbol detection algorithms are developed for long code wide-band CDMA systems including systems with multirate and multicode transmissions. A new identifiability condition is established which suggests that channels unidentifiable in short code CDMA systems are almost surely identifiable when aperiodic spreading codes are used. Applications in large scale sensor networks are also considered.

Download or read book Stochastic Geometry Analysis of Multi Antenna Wireless Networks written by Xianghao Yu and published by Springer. This book was released on 2019-03-27 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a unified framework for the tractable analysis of large-scale, multi-antenna wireless networks using stochastic geometry. This mathematical analysis is essential for assessing and understanding the performance of complicated multi-antenna networks, which are one of the foundations of 5G and beyond networks to meet the ever-increasing demands for network capacity. Describing the salient properties of the framework, which makes the analysis of multi-antenna networks comparable to that of their single-antenna counterparts, the book discusses effective design approaches that do not require complex system-level simulations. It also includes various application examples with different multi-antenna network models to illustrate the framework’s effectiveness.

Download or read book Performance Analysis of Wireless Ad Hoc Networks written by Martin Drozda and published by . This book was released on 2005 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis and Protocol Design for Multipacket Reception in Wireless Networks written by Pengxuan Zheng and published by . This book was released on 2007 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance Analysis of Wireless Networks written by Renato Mariz de Moraes and published by . This book was released on 2005 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we investigate the performance of wireless ad hoc networks. First, we propose a multi-copy relaying scheme for packets in mobile ad hoc networks (MANETs), which reduces the delivery delay without changing the throughput order. We also present a method for computing the interference caused from other nodes. Second, we study the trade-off among mobility, capacity, and delay for wireless ad hoc networks. By considering nodes that are subject to restrained movements, we found that mobility is an entity that can be exchanged with capacity and delay. Furthermore, the throughput-delay trade-off is investigated for nodes employing directional antennas and the results are compared with previous work. Third, we propose a new communication scheme based on collaboration among nodes where the transmission (exchange) of packets is concurrently possible by employing a many-to-many communication framework. We present the principles of operation for such a technique, followed by two practical examples of implementation using FDMA/CDMA, and FDMA/MIMO systems. Shannon capacity, throughput and delay are computed and compared with related works.

Download or read book Performance Evaluation of Wireless Ad Hoc Networks written by Renato M. de Moraes and published by LAP Lambert Academic Publishing. This book was released on 2010-05 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, the performance of wireless ad hoc networks is investigated. First, a multi-copy relaying scheme for packets in mobile ad hoc networks (MANETs) is proposed, which reduces the delivery delay without changing the throughput order. Also, a method for computing the interference caused from other nodes is presented. Second, the trade-off among mobility, capacity, and delay for ad hoc networks is studied. By considering nodes that are subject to restrained movements, it is found that mobility is an entity that can be exchanged with capacity and delay. Moreover, the throughput-delay trade-off is investigated for nodes employing directional antennas and the results are compared with previous work. Third, a new communication scheme based on collaboration among nodes is proposed where the transmission of packets is concurrently possible by employing a many-to-many communication framework, i.e., multi-packet transmission (MPT) and multi-packet reception (MPR). The principles of operation for such technique and two practical examples of implementation using FDMA/CDMA and FDMA/MIMO are presented. Shannon capacity, throughput and delay are computed and compared with related works.

Download or read book Signal Processing in Wireless Packet Networks written by Qi Bao and published by . This book was released on 1999 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wireless Networks Multiuser Detection in Cross Layer Design written by Christina Comaniciu and published by Springer Science & Business Media. This book was released on 2006-06-14 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cross-layer design seeks to enhance the capacity of wireless networks significantly through the joint optimization of multiple layers in the network, primarily the physical (PHY) and medium access control (MAC) layers. Although there are advantages of such design in wireline networks as well, this approach is particularly advantageous for wireless networks due to the properties (such as mobility and interference) that strongly affect performance and design of higher layer protocols. This unique monograph is concerned with the issue of cross-layer design in wireless networks, and more particularly with the impact of node-level multiuser detection on such design. It provides an introduction to this vibrant and active research area insufficiently covered in existing literature, presenting some of the principal methods developed and results obtained to date. Accompanied by numerous illustrations, the text is an excellent reference for engineers, researchers and students working in communication networks.

Download or read book Performance Analysis of Multi hop Ad Hoc Wireless Networks written by Megh Bhatt and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contributions to Scalable Wireless Ad Hoc Networks Supporting Quality of Service written by Arasch Honarbacht and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile ad hoc networks, also known as multihop or mesh networks, are gaining more and more attention these days. Originally designed for military applications, the idea of spontaneous communication using direct links to immediate neighbors has rapidly spread over to the civilian sector. This book focuses on the design of large-scale wireless multihop networks supporting quality-of-service. Based on an in-depth analysis of state-of-the-art architectures, the novel idea of cut-through/cell-switching is pointed out. Enhancements to the standard IEEE 802.11 DCF are presented as basic elements of diversified management protocols. An innovative approach to distributed dynamic channel assignment is introduced and benchmarked against one of the most powerful centralized algorithms known to date. Moreover, wireless sensor networks are identified as a new field of application for the classic Kalman filter.Finally, a new integrated R&D platform has been developed and is also part of the presentation. It consists of a simulation environment written in C++ and a software defined radio transceiver. The latter is based on an architecture employing the latest in digital signal processing: a general purpose DSP accompanied by FPGAs, dedicated digital up-/down converter ASICs, high-performance ADCs and DACs.

Download or read book Proceedings written by and published by . This book was released on 2001 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Random Multiple Access Communications on Multipacket Reception Channels written by Douglas Shing Tak Chan and published by . This book was released on 2006 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Signal Processing and Performance Analysis for Optimal Resource Allocation in Wireless Networks written by Javad Razavilar and published by . This book was released on 1998 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book System Performance Analysis of Ad Hoc Wireless Networks written by Danny M. Safi and published by ProQuest. This book was released on 2009 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: However, a lack of base stations results in difficulties in modelling the performance of such networks. There have been some investigations into the performance of ad hoc networks. Several areas that have not been considered are investigated. The effects of node density and system bandwidth is explored. It is shown that the performance of an ad hoc network can vary between two regimes depending on the bandwidth and density of the nodes. Many network models assume a uniform distribution of nodes. The effects of non-uniformity (clustering) are also studied. It is shown that clustering introduces two regimes on throughput performance which depends on the size of the network. Finally, the performance of an ad hoc network utilizing directional antennas is investigated. It is shown that a large increase in performance can be obtained. This performance increase can counteract the interference-related performance degradation of ad hoc networks for network sizes with thousands of nodes.

Download or read book Analytical Modeling of Medium Access Control Protocols in Wireless Networks written by Marcelo Menezes Carvalho and published by . This book was released on 2006 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new modeling framework is introduced for the analytical study of medium access control (MAC) protocols operating in multihop wireless ad hoc networks, i.e., wireless networks characterized by the lack of any pre-existent infrastructure and where participating devices must cooperatively provide the basic functionalities that are common to any computer network. The proposed modeling framework focuses on the interactions between the physical (PHY) and MAC layers, and on the impact that each node has on the dynamics of every other node in the network. To account for the effects of both cross-layer interactions and the interference among all nodes, a novel linear model is introduced with which topology and PHY/MAC-layer aspects are naturally incorporated in what we define as interference matrices. A key feature of the model is that nodes can be modeled individually, i.e., it allows a per-node setup of many layer-specific parameters. Moreover, no spatial probability distribution or special arrangement of nodes is assumed; the model allows the computation of individual (per-node) performance metrics for any given network topology and radio channel model.

Download or read book Protocol Design and Performance Evaluation for Wireless Ad Hoc Networks written by Fei Tong and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Benefiting from the constant and significant advancement of wireless communication technologies and networking protocols, Wireless Ad hoc NETwork (WANET) has played a more and more important role in modern communication networks without relying much on existing infrastructures. The past decades have seen numerous applications adopting ad hoc networks for service provisioning. For example, Wireless Sensor Network (WSN) can be widely deployed for environment monitoring and object tracking by utilizing low-cost, low-power and multi-function sensor nodes. To realize such applications, the design and evaluation of communication protocols are of significant importance. Meanwhile, the network performance analysis based on mathematical models is also in great need of development and improvement.This dissertation investigates the above topics from three important and fundamental aspects, including data collection protocol design, protocol modeling and analysis, and physical interference modeling and analysis. The contributions of this dissertation are four-fold.First, this dissertation investigates the synchronization issue in the duty-cycled, pipelined-scheduling data collection of a WSN, based on which a pipelined data collection protocol, called PDC, is proposed. PDC takes into account both the pipelined data collection and the underlying schedule synchronization over duty-cycled radios practically and comprehensively. It integrates all its components in a natural and seamless way to simplify the protocol implementation and to achieve a high energy efficiency and low packet delivery latency. Based on PDC, an Adaptive Data Collection (ADC) protocol is further proposed to achieve dynamic duty-cycling and free addressing, which can improve network heterogeneity, load adaptivity, and energy efficiency. Both PDC and ADC have been implemented in a pioneer open-source operating system for the Internet of Things, and evaluated through a testbed built based on two hardware platforms, as well as through emulations.Second, Linear Sensor Network (LSN) has attracted increasing attention due to the vast requirements on the monitoring and surveillance of a structure or area with a linear topology. Being aware that, for LSN, there is few work on the network modeling and analysis based on a duty-cycled MAC protocol, this dissertation proposes a framework for modeling and analyzing a class of duty-cycled, multi-hop data collection protocols for LSNs. With the model, the dissertation thoroughly investigates the PDC performance in an LSN, considering both saturated and unsaturated scenarios, with and without retransmission. Extensive OPNET simulations have been carried out to validate the accuracy of the model.Third, in the design and modeling of PDC above, the transmission and interference ranges are defined for successful communications between a pair of nodes. It does not consider the cumulative interference from the transmitters which are out of the contention range of a receiver. Since most performance metrics in wireless networks, such as outage probability, link capacity, etc., are nonlinear functions of the distances among communicating, relaying, and interfering nodes, a physical interference model based on distance is definitely needed in quantifying these metrics. Such quantifications eventually involve the Nodal Distance Distribution (NDD) intrinsically depending on network coverage and nodal spatial distribution. By extending a tool in integral geometry and using decomposition and recursion, this dissertation proposes a systematic and algorithmic approach to obtaining the NDD between two nodes which are uniformly distributed at random in an arbitrarily-shaped network.Fourth, with the proposed approach to NDDs, the dissertation presents a physical interference model framework to analyze the cumulative interference and link outage probability for an LSN running the PDC protocol. The framework is further applied to analyze 2D networks, i.e., ad hoc Device-to-Device (D2D) communications underlaying cellular networks, where the cumulative interference and link outage probabilities for both cellular and D2D communications are thoroughly investigated.

Download or read book Performance Analysis of Random Access Schemes for Wireless Ad Hoc Networks written by Athanasios Gkelias and published by . This book was released on 2006 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: