Mimo Based Wireless Local Area Networks

Mimo Based Wireless Local Area Networks

This book is intended to provide enough background material for the novice student enrolled in a graduate level course, while having enough advanced material to prime the more serious graduate students that would like to pursue research in ...

Author: Abduladhim Ashtaiwi

Publisher: LAP Lambert Academic Publishing

ISBN: 3838334728

Category:

Page: 180

View: 730

Wireless Local Area Networks (WLAN) a key technology for next generation wireless networking. However, supporting Quality of Service (QoS) to enable multimedia services is still one of the major issues in next-generation WLANs, QoS support in WLANs can be enhanced through the efficient cross-layer design of MAC protocols that utilizes advanced physical layer technologies viz Multiple Input Multiple Output (MIMO) with its multiple spatial channels that are capable of simultaneous receive or transmit streams. In this book, therefore, introduce the design of a comprehensive framework for medium access with provisions for effective bandwidth utilization. The framework includes the design of a QoS MIMO-aware MAC protocol that implements concurrent bandwidth sharing schemes, a MIMO-aware medium access collision avoidance scheme, and MIMO-aware bandwidth management schemes. This book is intended to provide enough background material for the novice student enrolled in a graduate level course, while having enough advanced material to prime the more serious graduate students that would like to pursue research in the area.
Categories:

Design and Simulation of Spectrum Management Methods for Wireless Local Area Networks

Design and Simulation of Spectrum Management Methods for Wireless Local Area Networks

Furthermore, a MIMO based transmission is now used for the channel model
which has been specified by the 802.11 task group n for the evaluation of MIMO
based WLAN transmissions [28]. It is a statistical channel model which includes ...

Author: Andreas Könsgen

Publisher: Springer Science & Business Media

ISBN: 9783834897381

Category: Computers

Page: 236

View: 770

Andreas Könsgen describes two major areas of spectrum management: the coordination of neighbouring networks with overlapping ranges by controlling different transmission parameters and the channel allocation by the base station inside a radio cell using a cross-layer approach. Theoretical analyses and simulations demonstrate the usage of these methods and show the QoS enhancements which can be achieved.
Categories: Computers

Multiple Access Communications

Multiple Access Communications

However, none of them implements in the scenario of multi-user MIMO networks.
7 Conclusion In this paper, a highly efficient MAC protocol for heterogeneous
MIMO-based WLAN is presented. Evaluation result shows our proposed ...

Author: Boris Bellalta

Publisher: Springer

ISBN: 9783642349768

Category: Computers

Page: 183

View: 827

This book constitutes the refereed proceedings of the 5th International Workshop on Multiple Access Communications, MACOM 2012, held in Maynooth, Ireland, in November 2012. The 13 full papers and 5 demo and poster papers presented were carefully reviewed and selected from various submissions. The papers are organized in topical sections on network coding, handling interference and localization techniques at PHY/MAC layers, wireless access networks, and medium access control.
Categories: Computers

Broadband Fixed Wireless Access

Broadband Fixed Wireless Access

[30] S. Thoen, "Transmit optimization for OFDM/SDMA-based wireless local area
networks", PhD dissertation, Katholieke ... [33] H. Sampath, P. Stoica, A.J. Paulraj,
"Generalized linear precoder and decoder design for MIMO channels using the ...

Author: Marc Engels

Publisher: Springer Science & Business Media

ISBN: 9780387345932

Category: Technology & Engineering

Page: 212

View: 930

This introductory volume provides a systematic overview of WiMAX technology, demystifing the technology and providing technical advice on various system trade-offs. Much of the material is based on the practical experiences of the authors in building new systems. Coverage includes the IEEE 802.16 standard, a tutorial on implementation and tips on controlling cost of WiMAX network ownership. This is a must read book for professionals involved in broadband fixed wireless access.
Categories: Technology & Engineering

Advances on Broadband and Wireless Computing Communication and Applications

Advances on Broadband and Wireless Computing  Communication and Applications

To improve the throughput of the IEEE wireless local area network (WLAN)
system, many uplink medium access control (MAC) protocols based on multi-user
multiple-input multiple-output (MU-MIMO) technology have been proposed.
However ...

Author: Leonard Barolli

Publisher: Springer

ISBN: 9783030026134

Category: Technology & Engineering

Page: 777

View: 783

This book presents on the latest research findings, and innovative research methods and development techniques related to the emerging areas of broadband and wireless computing from both theoretical and practical perspectives. Information networking is evolving rapidly with various kinds of networks with different characteristics emerging and being integrated into heterogeneous networks. As a result, a number of interconnection problems can occur at different levels of the communicating entities and communication networks’ hardware and software design. These networks need to manage an increasing usage demand, provide support for a significant number of services, guarantee their QoS, and optimize the network resources. The success of all-IP networking and wireless technology has changed the way of life for people around the world, and the advances in electronic integration and wireless communications will pave the way for access to the wireless networks on the fly. This in turn means that all electronic devices will be able to exchange the information with each other in a ubiquitous way whenever necessary.
Categories: Technology & Engineering

Cross Layer Design and Analysis for Mobile Ad Hoc Networks

Cross Layer Design and Analysis for Mobile Ad Hoc Networks

In IEEE International Symposium on a World of Wireless Mobile and Multimedia
Networks ( WoWM0M ) , pages 88–97 , Taormina - Giardini Naxos , June 2005 .
... A mac protocol for mimo based ieee 802.11 wireless local area networks .

Author: Hui Xu

Publisher:

ISBN: UCAL:W267696

Category:

Page: 516

View: 978

Categories:

Design and Experimentation of Rate Adaptation for IEEE 802 11n WLANs

Design and Experimentation of Rate Adaptation for IEEE 802 11n WLANs

In this book, we present a new practical Rate Adaptation (RA) algorithm, termed L3S, which extends legacy schemes with new MIMO features suitable for the forthcoming 802.11n high-speed MIMO-based WLAN products.

Author: Arafet Ben Makhlouf

Publisher: LAP Lambert Academic Publishing

ISBN: 3659349070

Category: IEEE 802.11 (Standard)

Page: 76

View: 486

Wireless Local Area Networks (WLANs) have become increasingly popular due to the recent availability of affordable devices providing multiple and high rate capabilities. Optimizing the performance of WLANs for emerging new Internet applications that demand High Throughput (HT) is an important and a highly challenging issue. In this book, we present a new practical Rate Adaptation (RA) algorithm, termed L3S, which extends legacy schemes with new MIMO features suitable for the forthcoming 802.11n high-speed MIMO-based WLAN products. We implement our rate adaptation algorithm in real hardware devices and evaluate its performance and compare it to the existing rate control mechanisms. Our experiments demonstrate that our scheme allows the current 802.11n devices to have a greater adaptability to a variety of wireless channel conditions and performs better than state-of-the-art rate adaptation algorithms.
Categories: IEEE 802.11 (Standard)

Multiple Access Communications

Multiple Access Communications

... H., Sung, D.: A Throughput Balancing Problem between Uplink and Downlink
in Multi-user MIMO-based WLAN Systems. ... W., Shen, X., Mark, J.W., Wang, Z.:
A Distributed Multi- User MIMO MAC Protocol for Wireless Local Area Networks.

Author: Alexey Vinel

Publisher: Springer Science & Business Media

ISBN: 9783642154270

Category: Business & Economics

Page: 287

View: 911

This book constitutes the proceedings of the Third International Workshop on Multiple Access Communications, MACOM 2010, held in Barcelona, Spain, in September 2010. The 21 full papers and 6 poster papers presented were carefully reviewed and selected from 40 submissions. They are divided in topical sections on medium access control, multiuser detection and advanced coding techniques, queuing systems, wireless mesh networks and WIMAX, advanced topics in wireless networks, and mobile ad-hoc networks.
Categories: Business & Economics

Standard Poor s Stock Reports

Standard   Poor s Stock Reports

WLANPlus is a Real - MIMO - based ( Multiple - Input Multiple - Output ) wireless
chipset designed for delivering data ... including video , voice and data at
significantly higher rates than conventional wireless local area networking (
WLAN ) ...

Author:

Publisher:

ISBN: CORNELL:31924104878479

Category: Corporations

Page:

View: 386

Categories: Corporations

Multimedia Communication Over Wireless Networks

Multimedia Communication Over Wireless Networks

From extensive experiments and subjective tests, our metrics show an correlation greater than 0.9 with the Mean Opinion Score (MOS) of human subjects.

Author: An Chan

Publisher:

ISBN: 1267757914

Category:

Page:

View: 502

Multimedia communications poses a number of challenges to the wireless networks. Traditional multiple access mechanisms in wireless local area networks (WLANs) are not suitable for conveying voice and video traffic. Various interferences, like intra-flow and inter-flow interference, detrimentally affects video streaming quality. Recently standardized multiple-input multiple-output (MIMO) technology in WLAN, IEEE 802.11n, although increases the data rate, its rate adaptation schemes cannot effectively support video streaming rates. On the other hand, the lossy nature of wireless networks results in inaccuracies in quality evaluation of video streaming. Such inaccuracies create hurdles for future development of multimedia communications in wireless networks. We propose to consider the characteristics of the multimedia application and that of wireless communications together, and take the advantages of these properties to develop communication protocols which can support multimedia delivery effectively. We propose a new multiple access protocol, Time Division Carrier-Sensing Multiple Access (TD-CSMA). Using the predictability of real-time traffic, TD-CSMA doubles the capacity of co-located multiple WLANs compared with the legacy CSMA. We also propose a new rate adaptation scheme, Video-aware Rate Adaptation (VARA). Based on the streaming rate variation of videos, VARA achieves the perfect quality for the high-definition (HD) video streaming in MIMO WLANs. Finally, by taking the impact of packet loss in wireless networks on video quality into account, we propose new video quality metrics. The new metrics can accurately evaluate the spatial and temporal quality of video streaming in wireless networks. From extensive experiments and subjective tests, our metrics show an correlation greater than 0.9 with the Mean Opinion Score (MOS) of human subjects. With the proposals in this thesis, we can greatly improve the performance of multimedia communications over wireless networks.
Categories:

Optimizing and Testing WLANs

Optimizing and Testing WLANs

This text will be of interest to RF wireless engineers and designers, networking engineers, IT professionals and managers, and graduate students. *Gives proven techniques for maximizing the coverage area and performance of wireless networks ...

Author: Tom Alexander

Publisher: Elsevier

ISBN: 9780080551128

Category: Technology & Engineering

Page: 280

View: 817

Optimizing and Testing WLANs explores proven techniques for maximizing the coverage area and performance of wireless networks. The author's insider position on the IEEE committee developing standards for WLAN testing ensures timeliness and technical integrity of the material. The book includes coverage of newer multiple input/multiple output (MIMO) wireless networks. The techniques provided will allow engineers to help maintain continuous wireless connectivity to laptops and other mobile devices. Optimizing and Testing WLANs is the first book to address the need to test WLANs (Wireless Local Area Networks) for proper performance and to optimize their operation as they become increasingly common. It covers test equipment and methods for the RF (wireless) and physical layers of WLAN, protocols, the application layer, and manufacturing testing. The emphasis throughout is on underlying engineering principles along with modern metrics and methodologies, ensuring this book gives both a solid theoretical background along with field-proven techniques and applications. A particularly engaging chapter deals with manufacturing test that describes some of the different manufacturing test setups and equipment. A concise introduction to deployment testing of "hotspots" and WLANs in enterprises is also provided. This text will be of interest to RF wireless engineers and designers, networking engineers, IT professionals and managers, and graduate students. *Gives proven techniques for maximizing the coverage area and performance of wireless networks *Author's insider position on the IEEE committee developing standards for WLAN testing ensures timeliness and technical integrity of the material *Includes coverage of newer multiple input/multiple output (MIMO) wireless networks
Categories: Technology & Engineering

High Performance Mimo Communications with Imperfect Channel Knowledge

High Performance Mimo Communications with Imperfect Channel Knowledge

Long Term Evolution ( LTE ) is a 4G OFDM - based ( Orthogonal Frequency
Division Multiplexing ) evolution standard that has recently ... One of the other
major successful wireless applications is wireless Local Area Networks ( LANs ) .

Author: Meriam K. R. Rezk

Publisher:

ISBN: UCAL:X84378

Category:

Page: 236

View: 422

Categories:

Coding for MIMO OFDM in Future Wireless Systems

Coding for MIMO OFDM in Future Wireless Systems

This book introduces the reader to the MIMO-OFDM system, in Rayleigh frequency selective-channels.

Author: Bannour Ahmed

Publisher: Springer

ISBN: 9783319191539

Category: Technology & Engineering

Page: 88

View: 380

This book introduces the reader to the MIMO-OFDM system, in Rayleigh frequency selective-channels. Orthogonal frequency division multiplexing (OFDM) has been adopted in the wireless local-area network standards IEEE 802.11a due to its high spectral efficiency and ability to deal with frequency selective fading. The combination of OFDM with spectral efficient multiple antenna techniques makes the OFDM a good candidate to overcome the frequency selective problems.
Categories: Technology & Engineering

Link Adaptation and Quality of Service Delivery in Mimo Wireless Network

Link Adaptation and Quality of Service Delivery in Mimo Wireless Network

In a Wireless Local Area Network (WLAN), as the signal travels from the transmitter to the receiver, it experiences various forms of impairments that cause fading and path loss.

Author: Etienne Alain Feukeu

Publisher:

ISBN: OCLC:817600278

Category: Dissertations, Academic

Page: 182

View: 935

In a Wireless Local Area Network (WLAN), as the signal travels from the transmitter to the receiver, it experiences various forms of impairments that cause fading and path loss. To cater for this problem, monitoring the link between the transmitter and receiver becomes imperative. This study focuses on the design of a link adaptation algorithm that seeks to improve the quality of service delivery in IEEE 802.11n networks. From the results, it is shown that the Greedy Algorithm (GA) performed far better than that of Auto-Rate-Fallback (ARF) and it is also shown that the Optimal Algorithm (OA) approach outperformed GA and ARF in terms of throughput and efficiency. Simulations results of both proposed algorithms proved to be more efficient than the existing ARF algorithm. Thus, it is shown that the proposed algorithms have the potential of enhancing the quality of service in IEEE 802.11n network.
Categories: Dissertations, Academic

Enabling Technologies for Next Generation Wireless Local Area Networks WLANs

Enabling Technologies for Next Generation Wireless Local Area Networks  WLANs

Next-generation wireless local area networks (WLANs) address two major challenges.

Author: Ahmed Gamal Helmy Mohamed

Publisher:

ISBN: OCLC:1019711081

Category: Internet of things

Page:

View: 421

Next-generation wireless local area networks (WLANs) address two major challenges. The first is the flexibility to provide significantly increased users' throughput due to the current evolution of the Internet usage toward real-time high-definition video content. Multi-input multi-output (MIMO) transmission at both access points (APs) and stations (STAs) is one of the key technologies to achieve high throughput in WLANs for both single-user MIMO (SUMIMO) and downlink multi-user MIMO (MU-MIMO). This requires APs and STAs to effi- ciently communicate while addressing challenging design trade-offs between energy efficiency, implementation complexity, and overall network spectral efficiency. In current WLANs, implementing MIMO techniques for SU-MIMO, which utilizes multiple radio-frequency (RF) chains, has become the norm. Thus, using a small number of RF chains, and ideally a single RF chain, is highly desirable for future low-power devices. The second challenge is dense deployment scenarios where many heterogeneous devices, from high-end laptops to low-power Internet of Things (IoT) devices and wearables, must coexist and operate reliably. In these dense scenarios, most relevant challenges in MU-MIMO are related to interference issues, which increase the packet error. In this dissertation, we focus on enhancing the user experience in SU-MIMO transmission and improving interference management techniques in MU-MIMO transmission for dense deployment WLAN scenarios. For SU-MIMO, we adopt Spatial Modulation (SM) as a single- (or few-) RF MIMO transmission technique that efficiently uses multiple antennas while addressing challenging design trade-offs between energy efficiency, implementation complexity, and overall network spectral efficiency. This motivates SM-based transmission for low-power IoT devices providing a better user experience for dense environments. We analyze the robustness of SM-based direct-conversion transceivers under transmit in-phase/quadrature (I/Q) imbalance. Then, we propose temporal modulation as a new dimension to enhance the performance of spatiallymodulated space-time block codes (STBC) while achieving a full transmit diversity order. Based on our proposed codebook, we propose the first differential transmission scheme for spatial modulation with multiple active transmit antennas. For the multi-stream MU-MIMO interference networks, we study the problem of per-stream maximum sum-rate (MSR) joint precoder and minimum mean-squared error (MMSE) equalizer design for the scenarios where multiple independent transmitters send data streams to corresponding different receivers via a shared channel forming an interference environment. We propose a generalized iterative algorithm which directly maximizes the sum-rate without assuming the signal-to-noise ratio (SNR) to be infinite. To reduce complexity, which can become prohibitive for large network size, we examine the performance-complexity tradeoffs involved in a sparse equalizer design. Joint precoder and equalizer optimization requires alternation between the forward and reverse links and assumes perfect synchronization between the transmitters and receivers at each network node, resulting in extensive overhead and spectral efficiency loss. To overcome this serious drawback, we propose a new design approach based on weighted-sum-rate maximization assuming a virtual equalizer type at the transmitter to limit the optimization process to the transmitter side. Finally, we quantify the sum-rate loss due to mismatched equalizer types and demonstrate the robustness of our proposed sum-rate weighting strategy to such mismatches with perfect or imperfect channel knowledge.
Categories: Internet of things

IEEE 802 11ac High impact Technology What You Need to Know

IEEE 802  11ac  High impact Technology   What You Need to Know

This is accomplished by extending the air interface concepts embraced by 802.11n: wider RF bandwidth (up to 160 MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high-density modulation (up to 256 QAM).

Author: Kevin Roebuck

Publisher: Tebbo

ISBN: 1743043589

Category: Computers

Page: 124

View: 362

IEEE 802.11ac is a wireless standard of 802.11 currently under development which will provide high throughput Wireless Local Area Networks (WLAN) below 6 GHz (i.e., what is commonly known as the 5 GHz band). Theoretically, this specification will enable multi-station WLAN throughput of at least 1 gigabit per second (1 Gbit/s) and a maximum single link throughput of at least 500 megabit per second (500 Mbit/s). This is accomplished by extending the air interface concepts embraced by 802.11n: wider RF bandwidth (up to 160 MHz), more MIMO spatial streams (up to 8), multi-user MIMO, and high-density modulation (up to 256 QAM). On January 20, 2011, the Initial Technical Specification Draft 0.1 was confirmed by IEEE 802.11 TGac. Standard finalization is anticipated in late 2012, with final 802.11 Working Group approval in late 2013. According to a study, devices with the 802.11ac specification are expected to become common by 2015 with an estimated 1 billion spread around the world. This book is your ultimate resource for IEEE 802.11ac. Here you will find the most up-to-date information, analysis, background and everything you need to know. In easy to read chapters, with extensive references and links to get you to know all there is to know about IEEE 802.11ac right away, covering: IEEE 802.11ac, IEEE 802.11, 125 High Speed Mode, IEEE 802.11 (legacy mode), 802.11 non-standard equipment, IEEE 802.11a-1999, Wireless access point, Yota Egg, AEGIS SecureConnect, Announcement Traffic Indication Message, Arbitration inter-frame spacing, Block acknowledgement, IEEE 802.11b-1999, Beacon frame, CALM M5, Capwap, Carrier sense multiple access with collision avoidance, CCMP, Complementary code keying, DCF Interframe Space, Distributed coordination function, IEEE 802.11d-2001, Direct-sequence spread spectrum, Exposed node problem, Extended interframe space, IEEE 802.11e-2005, Frame aggregation, IEEE 802.11g-2003, Hidden node problem, IEEE 802.11h-2003, IEEE 802.11i-2004, Information Element, Inter-Access Point Protocol, IEEE 802.11j-2004, IEEE 802.11k-2008, Line-of-sight propagation, List of WLAN channels, Lorcon, MeshBox, IEEE 802.11n-2009, Nitro (wireless networking), IEEE 802.11p, PCF Interframe Space, Point coordination function, Power control, IEEE 802.11r-2008, Reduced Interframe Space, Received Channel Power Indicator, Received signal strength indication, Regdomain, Roofnet, IEEE 802.11 RTS/CTS, IEEE 802.11s, Short Interframe Space, Super G (wireless networking), Temporal Key Integrity Protocol, TU (Time Unit), IEEE 802.11u, IEEE 802.11v, IEEE 802.11w-2009, Wi-Fi operating system support, Wi-Fi Protected Access, Wired Equivalent Privacy, Wireless Distribution System, World-Wide Spectrum Efficiency, Xpress technology, IEEE 802.11y-2008 This book explains in-depth the real drivers and workings of IEEE 802.11ac. It reduces the risk of your technology, time and resources investment decisions by enabling you to compare your understanding of IEEE 802.11ac with the objectivity of experienced professionals.
Categories: Computers

Testing 802 11 WLANs

Testing 802 11 WLANs

This text will be of interest to RF wireless engineers and designers, networking engineers, IT professionals and managers, and graduate students. *Gives proven techniques for maximizing the coverage area and performance of wireless networks ...

Author: Tom Alexander

Publisher:

ISBN: 0750679867

Category: Local area networks (Computer networks)

Page:

View: 424

Categories: Local area networks (Computer networks)

NTT Technical Review

NTT Technical Review

Technologies for Next - generation Wireless LANS Osamu Kagamit , Ichihiko
Toyoda , and Masahiro Umehira Abstract This article reviews ... After surveying
the trends for WLANs , we describe next - generation WLAN technologies
including MIMO ( multiple input multiple ... home network can generally be made
as either ( 1 ) a wired system based on optical - fiber , coaxial , or twisted - pair
cables , ( 2 ) a ...

Author:

Publisher:

ISBN: UCSD:31822032899353

Category: Information technology

Page:

View: 327

Categories: Information technology

Information Technology

Information Technology

Abstract: This revision specifies technical corrections and clarifications to IEEE Std 802.11 for wireless local area networks (WLANS) as well as enhancements to the existing medium access control (MAC) and physical layer (PHY) functions.

Author:

Publisher:

ISBN: 0738180076

Category: Local area networks (Computer networks)

Page: 2699

View: 882

Abstract: This revision specifies technical corrections and clarifications to IEEE Std 802.11 for wireless local area networks (WLANS) as well as enhancements to the existing medium access control (MAC) and physical layer (PHY) functions. It also incorporates Amendments 1 to 10 published in 2008 to 2011. Keywords: 2.4 GHz, 3650 MHz, 4.9 GHz, 5 GHz, 5.9 GHz, advanced encryption standard, AES, carrier sense multiple access/collision avoidance, CCMP, channel switching, Counter mode with Cipher-block chaining Message authentication code Protocol, confidentiality, CSMA/CA, DFS, direct link, dynamic frequency selection, E911, emergency alert system, emergency services, forwarding, generic advertisement service, high throughput, IEEE 802.11, interface, international roaming, interworking, interworking with external networks, LAN, local area network, MAC, measurement, medium access control, media-independent handover, medium access controller, mesh, MIH, MIMO, MIMO-OFDM, multi-hop, multiple input multiple output, network advertisement, network discovery, network management, network selection, off-channel direct link, path-selection, PHY, physical layer, power saving, QoS, quality of service, PHY, physical layer, QoS mapping, radio, radio frequency, RF, radio resource, radio management, SSP, SSPN, subscriber service provider, temporal key integrity protocol, TKIP, TPC, transmit power control, tunneled direct link setup, wireless access in vehicular environments, wireless LAN, wireless local area network, WLAN, wireless network management, zero-knowledge proof.
Categories: Local area networks (Computer networks)