Search Results for uplink-downlink

Deep Space Network

Uplink downlink

It is derived from the measured frequency difference between the transmitted
uplink signal and the received downlink signal . Range data represents the
distance ( range ) between the spacecraft and the Earth station . It is derived from
the ...

Author: Douglas J. Mudgway

Publisher:

ISBN: NASA:31769000641053

Category: Deep Space Network

Page: 674

View: 609

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How are NASA's robotic spacecraft tracked and controlled? Although the public generally focuses its attention on the remarkable scientific achievements of these spacecraft, the Deep Space Network (DSN) is less heralded. The DSN, however, provides the logistical backbone for scientists, engineers, and technicians to know where a particular spacecraft is, to be able to send it on its proper path through (and in some cases beyond) the solar system, and to download useful scientific data. Douglas Mudgway tells the compelling story of how this complex technological and international system was built and improved over four decades. Therefore, it is appropriate that the Deep Space Network be recognized at this time for its contribution to this remarkable record of progress in our knowledge of the solar system. "Uplink-downlink" presents this record clearly for the attention of specialists, policymakers, students, and general readers.
2001 By Douglas J. Mudgway

Satellite Communications

As the uplink carrier frequency goes on increasing , the size of antenna goes on
reducing . This reduces the size of complete earth station . TO er 1 . 1 . 2 . 2
Satellite Downlink The amplifier and transmitting antennas now are placed on the
 ...

Author: V.S.Bagad

Publisher: Technical Publications

ISBN: 8184315929

Category:

Page: 220

View: 971

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2009 By V.S.Bagad
Computers

Wireless Communications

We will discuss multiuser channel capacity regions for both the uplink and the
downlink . We also consider random access techniques , whereby signaling
dimensions are allocated only to active users , as well as power control , which
ensures ...

Author: Andrea Goldsmith

Publisher: Cambridge University Press

ISBN: 0521837162

Category: Computers

Page: 644

View: 632

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A comprehensive introduction to the basic principles, design techniques and analytical tools of wireless communications.
2005-08-08 By Andrea Goldsmith

Principles Of Communication

Carrier processing involves the demodulation of the uplink carrier frequencies
and remodulation of the information on downlink frequencies . It can also change
the modulation format for downlink . Normally uplink and downlink frequencies ...

Author: Dr.J.S.Chitode

Publisher: Technical Publications

ISBN: 8184316615

Category:

Page: 556

View: 310

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2009 By Dr.J.S.Chitode

A Wideband Satcom Based Avionics Network with CDMA Uplink and TDM Downlink

A Wideband Satcom Based Avionics Network With CDMA Uplink and TDM
Downlink n i = 0 will be employed for the many. D. Agrawal and B.S. Johnson
University of Illinois Urbana , Illinois U. Madhow University of California , Santa
Barbara ...

Author: D. Agrawal

Publisher:

ISBN: NASA:31769000638349

Category:

Page: 16

View: 805

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2000 By D. Agrawal
Technology & Engineering

Broadband Wireless Communications

need to continuously monitor the downlink looking for packets that might be
addressed to them. TDD and Multi-Frequency Implementations. Although, for
illustration, we described an FDD implementation of DQRUMA (with a single
uplink ...

Author: Marco Luise

Publisher: Springer Science & Business Media

ISBN: 9781447115700

Category: Technology & Engineering

Page: 432

View: 922

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Broadband Wireless Access is a highly challenging and fast changing area of multimedia radio communications. These papers on the subject are the proceedings of the 9th Tyrrhenian Workshop, held in Lerici, Italy, September 1997. They provide a prospect on the state of the art and future development, with a sufficiently wide focus to cover technological, architectural and regulatory issues. Emphasis is given to those advances of digital signal processing techniques, microwave mono lithic integrated circuits and smart antennae that will allow the design of low cost user terminals with advanced capabilities. Specific attention is also devoted to the protocols these new terminals will use to access the radio medium, and to the kind of services that will eventually be provided to the end-user in the future. With contributions from worldwide experts, the material presented here is a timely and high-level overview of the field, and as well as being informative is a useful tool for promoting further investigation into the area of multimedia radio communications.
2012-12-06 By Marco Luise
Computers

WCDMA

If such a TDD proposal, which has different solutions for the uplink and downlink (
where uplink uses a single wideband carrier and downlink a multicarrier
approach), is applied, channel reciprocity cannot be utilized. The effect of such a
 ...

Author: Tero Ojanperä

Publisher: Artech House

ISBN: 1580534619

Category: Computers

Page: 477

View: 308

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While covering the basics of wideband CDMA, the key UMTS technology, this major revision of the best-selling Wideband CDMA for Third Generation Mobile Communications brings you up-to-date with all the latest developments in third generation mobile communications. New sections cover fundamental IP concepts, All-IP core networks, and WCDMA, EDGE and cdma2000 technologies, including their future developments - WCDMA HSPA and 1XEV. The book gives you a complete understanding of the complex standardization environment of 3G networks and the design and development of 3G systems. It describes how third generation system applications impact radio access system design and compares and contrasts major wideband CDMA standards: WCDMA, WCDMA TDD and cdma2000. Includes 190 illustrations and 75 equations.
2001 By Tero Ojanperä
Technology & Engineering

WiFi WiMAX and LTE Multi hop Mesh Networks

Downlink and uplink frames are allocated in separate frequency carriers. There
are totally 10 subframes within the 10-ms frame. Each subframe lasts for 1 ms. In
each subframe, there are two halfmillisecond time slots. For TDD operation ...

Author: Hung-Yu Wei

Publisher: John Wiley & Sons

ISBN: 9781118571118

Category: Technology & Engineering

Page: 280

View: 817

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Wifi, WiMAX, and Cellular Multihop Networks presents an overview of WiFi-based and WiMAX-based multihop relay networks. As the first text to cover IEEE 802.16j multihop hop relay technology, this revolutionary resource explores the latest advances in multi-hop and ad-hoc networking. Not only does this reference provide the technological aspects, but also the applications for the emerging technology and architectural issues. Ranging from introductory material to advanced topics, this guidebook is essential for engineers, researchers, and students interested in learning more about WiFi and WiMAX multihop relay networks.
2013-03-05 By Hung-Yu Wei
Technology & Engineering

Wireless Broadband Networks

I x g E downlink I § E downlink ranging ranging 2 8 g Q g % burst #3 E g 'g .g
burst #3 subchannel subchannel E o — 5% g g d I. k 'I g Q g; d I. k up|ink burst #1
relay uplink burst #1 E E 8358 ownin —_85L§ ownin If If 0 E 8.5 burst #4 8 E
burst ...

Author: David T. Wong

Publisher: John Wiley & Sons

ISBN: 0470434937

Category: Technology & Engineering

Page: 528

View: 555

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An introduction to theories and applications in wireless broadband networks As wireless broadband networks evolve into future generation wireless networks, it's important for students, researchers, and professionals to have a solid understanding of their underlying theories and practical applications. Divided into two parts, the book presents: Enabling Technologies for Wireless Broadband Networks—orthogonal frequency-division multiplexing and other block-based transmissions; multi-input/multi-output antenna systems; ultra-wideband; medium access control; mobility resource management; routing protocols for multi-hop wireless broadband networks; radio resource management for wireless broadband networks; and quality of service for multimedia services Systems for Wireless Broadband Networks—long-term evolution cellular networks; wireless broadband networking with WiMax; wireless local area networks; wireless personal area networks; and convergence of networks Each chapter begins with an introduction and ends with a summary, appendix, and a list of resources for readers who would like to explore the subjects in greater depth. The book is an ideal resource for researchers in electrical engineering and computer science and an excellent textbook for electrical engineering and computer science courses at the advanced undergraduate and graduate levels.
2009-04-01 By David T. Wong
Computers

LTE for 4G Mobile Broadband

With the exception of a scheduling request, all uplink control consists of feedback
information to support downlink transmissions. The channel quality feedback is
provided to support downlink channel-sensitive scheduling and link adaptation.

Author: Farooq Khan

Publisher: Cambridge University Press

ISBN: 9780521882217

Category: Computers

Page: 492

View: 306

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Understand the new technologies of the LTE standard and their impact on system performance improvements with this practical guide.
2009-03-26 By Farooq Khan
Technology & Engineering

Advances in 3G Enhanced Technologies for Wireless Communications

Uplink TPC is required to combat the near-far problem because the BSs receive
uplink signals that are asynchronous and ... Downlink TPC, however, is mainly
used to reduce the transmission power used by Ms. In both uplinks and
downlinks, ...

Author: Jiangzhou Wang

Publisher: Artech House

ISBN: 1580535550

Category: Technology & Engineering

Page: 350

View: 472

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A compilation of the cutting edge work of leading researchers and engineers from major telecommunications firms worldwide, this timely volume describes various technical regimes for implementing third generation wireless mobile communications systems, and covers the latest enhanced techniques.
2002 By Jiangzhou Wang
Computers

Power Distribution and Performance Analysis for Wireless Communication Networks

Similar to the uplink, 1/Qξ,i can be considered as the norPd,i , (2.14) malized
amount of resource consumed by user i in the downlink, if the total downlink
capacity is normalized to 1. The target receiving power at user i is given by ηi Qξ,i
 ...

Author: Dongmei Zhao

Publisher: Springer Science & Business Media

ISBN: 9781461432845

Category: Computers

Page: 99

View: 189

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This book provides an analysis of transmission power and network performance in different wireless communication networks. It presents the latest research and techniques for power and interference control and performance modeling in wireless communication networks with different network topologies, air interfaces, and transmission techniques. While studying the power distributions and resource management, the reader will also learn basic methodology and skills for problem formulations, can ascertain the complexity for designing radio resource management strategies in modern wireless communication networks, thus keeping pace with state-of-the-art research progress in radio transmission technologies.
2012-02-25 By Dongmei Zhao
Computers

Implementing 802 1X Security Solutions for Wired and Wireless Networks

Keep in mind, however, that this is only in relation to the downlink path. It doesn't
take into consideration the uplink signals from the client devices. Something to
consider is that most access points have a significantly higher transmit power ...

Author: Jim Geier

Publisher: John Wiley & Sons

ISBN: 9780470168608

Category: Computers

Page: 330

View: 769

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You know it’s essential, and you′ve heard that it can be tricky implementing the 802.1x standard. Here is a road map that will enable you to approach 802.1x implementation with confidence so that you can conduct successful implementation of 802.1x in both wired and wireless networks. Complete with step–by–step instructions, recommendations to help you choose the best solutions, and troubleshooting tips, it lets you benefit from the experience of others who have met the challenge.
2008-04-14 By Jim Geier
Technology & Engineering

Modulation and Coding Techniques in Wireless Communications

Figure 11.99 LTE frame structure1 11.4.1.1.1 TDD Frame Structure and the
Special Subframe Since downlink and uplink transmissions in FDD are
separated in frequency, all subframes are either uplink or downlink DL, but in
TDD the radio ...

Author: Evgenii Krouk

Publisher: John Wiley & Sons

ISBN: 9780470976715

Category: Technology & Engineering

Page: 680

View: 386

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The high level of technical detail included in standards specifications can make it difficult to find the correlation between the standard specifications and the theoretical results. This book aims to cover both of these elements to give accessible information and support to readers. It explains the current and future trends on communication theory and shows how these developments are implemented in contemporary wireless communication standards. Examining modulation, coding and multiple access techniques, the book is divided into two major sections to cover these functions. The two-stage approach first treats the basics of modulation and coding theory before highlighting how these concepts are defined and implemented in modern wireless communication systems. Part 1 is devoted to the presentation of main L1 procedures and methods including modulation, coding, channel equalization and multiple access techniques. In Part 2, the uses of these procedures and methods in the wide range of wireless communication standards including WLAN, WiMax, WCDMA, HSPA, LTE and cdma2000 are considered. An essential study of the implementation of modulation and coding techniques in modern standards of wireless communication Bridges the gap between the modulation coding theory and the wireless communications standards material Divided into two parts to systematically tackle the topic - the first part develops techniques which are then applied and tailored to real world systems in the second part Covers special aspects of coding theory and how these can be effectively applied to improve the performance of wireless communications systems
2011-01-19 By Evgenii Krouk
Technology & Engineering

UMTS Signaling

After HSDPA was introduced for high speed data transmission on the downlink in
Release 5 there was a need to introduce a similar enhancement for uplink data
transport. As a result enhanced uplink data transfer for FDD radio mode was ...

Author: Ralf Kreher

Publisher: John Wiley & Sons

ISBN: 9781118408599

Category: Technology & Engineering

Page: 528

View: 793

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This completely revised and updated edition of the highlysuccessful UMTS Signaling provides a deep insight into allaspects of UMTS signalling. The chapter structure has been reworkedfor improved “usability” for readers, as well asincluding many new features and updates. The successful trial, deployment, operation and troubleshootingof 3G or UMTS infrastructures and applications is the biggestchallenge facing today’s mobile communications. Networkelement instability, network element and multi-vendorinteroperability, configuration and network planning faults arejust a few of the challenges affecting performance andprofitability that need to be addressed. This book is an invaluableguide to resolving such problems. Highlights of the Second Edition: Includes new information and scenarios on HSPA / HSDPA / HSUPA,and IMS Covers not only WCDMA, but also TD-SCDMA issues Contains up-to-date information on releases 5 and 6, andincludes a new chapter on the future releases 7 and 8 Provides crucial information for network operators andequipment suppliers keen to understand how to handle and analyseUMTS signaling procedures in order to get the network intooperation, detect errors and troubleshoot faults Uses first hand, real world information to explain issues whichare unclear in the standards Includes comprehensive descriptions and documentation of UMTSreference scenarios for different UMTS procedures The unified comprehensive approach taken by the authors makesthis book essential reading for engineers in network operators,integrators or system suppliers who need to be at the cutting edgeof this technology. It will also be an invaluable resource forpostgraduates on telecommunications courses, especially those witha focus on signal analysis.
2012-04-27 By Ralf Kreher
Technology & Engineering

Mobile Handset Design

For uplink and downlink separation, GSM uses a frequency division duplex (FDD
) technique. So the uplink and downlink frequencies are different. As mentioned
earlier, GSM 900 was the first GSM system to be deployed, and uses a 25 MHz ...

Author: Sajal Kumar Das

Publisher: John Wiley & Sons

ISBN: 9781118684573

Category: Technology & Engineering

Page: 512

View: 210

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The evolution of mobile communication standards presents numerouschallenges in mobile handset design. Designers must continue toturn out handsets that maintain high device performance and airinterface compatibility, while at the same time shrink powerconsumption, form factors, and costs. Mobile Handset Design is uniquely written to equipprofessionals and students with a complete understanding of how amobile phone works, and teaches the skills to design the latestmobile handsets. Das walks readers through mobile phone operatingprinciples, system infrastructure, TDMA-FDMA-CDMA-OFDMA techniques,hardware anatomy, software and protocols, and internal modules,components, and circuits. He presents all problems associated withmobile wireless channels and recommends corresponding designsolutions to overcome those issues. Mobile RF front-end, digitalbaseband design techniques, and associated trade-offs are alsocovered. Das also discusses the productization aspects and reviewsnew research developments for different mobile phone systems overgenerations. Teaches basic working principles of legacy and 4G mobilesystems Vividly illustrates and explains all key components and theanatomy of mobile phones Explains all hardware and software blocks, from principle topractice to product Discusses key design attributes such as low power consumptionand slim form factors Moves through all topics in a systematic fashion for easycomprehension Presentation files with lecture notes available for instructoruse This book is essential for practicing software, hardware and RFdesign engineers and product managers working to create innovate,competitive handsets. Mobile Handset Design is also idealfor fresh graduates or experienced engineers who are new to themobile industry, and is well-suited for industry veterans as ahandy reference. Lecture materials for instructors available at ahref="http://www.wiley.com/go/dasmobile"www.wiley.com/go/dasmobile/a
2013-05-29 By Sajal Kumar Das
Technology & Engineering

New Horizons in Mobile and Wireless Communications Volume 4

The methodology includes both the downlink and the uplink. Multiple services (
e.g., voice and data) flowing in the same direction could also be compared in the
same way [20]. Figure 6.12 shows an indifference map containing the
indifference ...

Author: Ramjee Prasad

Publisher: Artech House

ISBN: 9781607839743

Category: Technology & Engineering

Page: 473

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Based on cutting-edge research projects in the field, this book (part of a comprehensive 4-volume series) provides the latest details and covers the most impactful aspects of mobile, wireless, and broadband communications development. These books present key systems and enabling technologies in a clear and accessible manner, offering you a detailed roadmap the future evolution of next generation communications. Other volumes cover Networks, Services and Applications; Reconfigurability; and Ad Hoc Networks.
2009 By Ramjee Prasad
Technology & Engineering

Introduction to 3G Mobile Communications

Channelization occurs before scrambling in the transmitter both in the uplink and
the downlink. Channelization transforms each data symbol into multiple chips.
This ratio (number of chips/symbol) is called the spreading factor (SF). Thus, it is
 ...

Author: Juha Korhonen

Publisher: Artech House

ISBN: 1580535941

Category: Technology & Engineering

Page: 544

View: 350

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This newly revised edition of an Artech House bestseller provides you with an up-to-date introduction to third generation (3G) mobile communication system principles, concepts, and applications. The book clearly presents the basics of UMTS systems in one comprehensive volume, without bogging you down with advanced mathematics. The second edition includes an even more thorough treatment of potential 3G applications and descriptions of new, emerging technologies such as 3G System Release number 5, HSDPA, and Multimedia Broadcast/Multicast Service (MBMS). It also features discussions on both 3GPP and 3GPP2 evolution paths, the specification process, and future 3G upgrades.
2003 By Juha Korhonen
Technology & Engineering

Wireless Communications

More precisely, an RB is 12 subcarriers (180kHz) over the duration of one slot.3
For the uplink, only contiguous RBs can ... One downlink slot Tslot One uplink slot
T slot Nsymb DL OFDM symbols NsymbUL SC-FDMA symbols k = NRB UL Nsc ...

Author: Andreas F. Molisch

Publisher: John Wiley & Sons

ISBN: 9781118355688

Category: Technology & Engineering

Page: 884

View: 962

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"Professor Andreas F. Molisch, renowned researcher and educator, has put together the comprehensive book, Wireless Communications. The second edition, which includes a wealth of new material on important topics, ensures the role of the text as the key resource for every student, researcher, and practitioner in the field." —Professor Moe Win, MIT, USA Wireless communications has grown rapidly over the past decade from a niche market into one of the most important, fast moving industries. Fully updated to incorporate the latest research and developments, Wireless Communications, Second Edition provides an authoritative overview of the principles and applications of mobile communication technology. The author provides an in-depth analysis of current treatment of the area, addressing both the traditional elements, such as Rayleigh fading, BER in flat fading channels, and equalisation, and more recently emerging topics such as multi-user detection in CDMA systems, MIMO systems, and cognitive radio. The dominant wireless standards; including cellular, cordless and wireless LANs; are discussed. Topics featured include: wireless propagation channels, transceivers and signal processing, multiple access and advanced transceiver schemes, and standardised wireless systems. Combines mathematical descriptions with intuitive explanations of the physical facts, enabling readers to acquire a deep understanding of the subject. Includes new chapters on cognitive radio, cooperative communications and relaying, video coding, 3GPP Long Term Evolution, and WiMax; plus significant new sections on multi-user MIMO, 802.11n, and information theory. Companion website featuring: supplementary material on 'DECT', solutions manual and presentation slides for instructors, appendices, list of abbreviations and other useful resources.
2012-02-06 By Andreas F. Molisch
Computers

Multimedia Communications and Networking

Uplink Downlink Frequency Analog telephony 20 25 140 150 1000 Figure 9.15
Generic use of spectrum by a xDSL modem. Uplink Downlink Frequency
Subcarriers Analog telephony Figure 9.16 Generic spectrum of a xDSL modem
that uses ...

Author: Mario Marques da Silva

Publisher: CRC Press

ISBN: 9781466559202

Category: Computers

Page: 506

View: 568

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The result of decades of research and international project experience, Multimedia Communications and Networking provides authoritative insight into recent developments in multimedia, digital communications, and networking services and technologies. Supplying you with the required foundation in these areas, it illustrates the means that will allow
2016-04-19 By Mario Marques da Silva

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