Satellite communication systems - IEEE Xplore

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satellites, Mathcad data files, mathe- matical formulas, and glossary tcrms. ... (Continued on page 48). 46. IEEE Communications Magazine * June 2000 ...
BOOK REVIEWS (Continnedfmm page 44)

duccs some of the basic and gencral ideas hchind error correction coding and focuscs in particular on the coding scheme employed in CDPD (i.e., Reed Solomon coding). It presents a basic thcoretical framework of Recd Solomon coding, and it demonstrates through specific Mathcad examples thc implcmentatioii of a Recd Solomon encoder and decoder for the CDPD system. In addition, it discusses the practical implemcntation of the CDPD scrambler. Thc last chapter, “Introduction to Radio Regulatory Requiremcnts,” discusses an important but typically overlooked process, thc radio regulatory lypc approval, which can hc a mystery to enginecrs. A brief introduction to the radio regulatory approval proccdure is presented in an attcmpt to familiarizc the rcader with somc of the finer points of this proccss. In this context, the FCC Part 1.5 Regulation rcquiremcnts are outlined, and several issues related to EMI arc discusscd and cxplaincd. The six appendices of the hook pro-

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vide sevcral listings of gcostationary satellites, Mathcad data files, mathematical formulas, and glossary tcrms. In summary, Pructical Wireless Data Modem Design is an interesting hook that discusscs hoth theoretical aspccts and practical implcinentations. Its main feature is thc presentation of numcrous practical cxamplcs that demonstrate how communications thcory is realized in actual circuit implemcntation. In this context, it resolves much of the frustration involved with working out abstract mathcmatical equations without knowing how they can help to solve realworld problems.

SATELLITECOMMUNICATION SYSTEMS, 3RD EDITION EDITED BY B. G. EVANS, THE lNSTlTUTlON OF ELECTRICAL

ENGINEERS,LONDON, UK, ISBN 0-85296-899-X REVIEWER:CATHERINEROSENBERG Satellites have playcd a very important role in the dclivcry of broadcast TV a s well as in communications in the past

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years. They arc also playing an everincreasing role in the public and private Internets, duc mostly to their largc geographic coverage, inhercnt broadcast capabilities, and fast deployment. Satellite networks are attractive for providing broadband access to users who either are beyond the rcach of thc new terrestrial hroadband access technologies, or have particular needs for broadcastlmulticast applications or fast deployment. They also have an important role to play in the next gencration of wireless mobile systems. Satellite Communication Systems, cdited by B. G. Evans, offers extensive and comprehensive coverage of thc domain based on the expertise and experience of a rclativcly large group of U.K. researchers and enginecrs. It focuses mostly on current systcms. T h c objective of thc book, as stated in its preface, is to enable thosc with a basic enginccring or mathemdtically based education to entcr, and spccializc in, thc field of satcllite communication with minimal cffort. The book can be categorized into five parts. Part I, which is composcd of (Continued on page 48)

IEEE CommunicationsMagazine * June 2000

BOOK REVIEWS (Continued from page 46) Chapters 1 through 4, presents an introduction to all tcchnical and nontechnical aspccts of satellitc communication systems. Aftcr it hricf introduction in Chaptcr 1, thc historical background of satcllite communications is presented in Chapter 2. Following this, Chapter 3 presents a clcar picture of thc currcnt satellitc commuiiicatioii business, and Chapter 4 outlincs radio regulatory considerations. Chaptcr 3, however, spcnds too littlc time on the major industrial playcrs and is relatively Europe-centric on this topic. Part-2, composcd of Chaplcrs 5 through 10, aims to provide the technical background necessary to uuderstaiid satellite communications, Chapter 5 presents a tno hricf introduction to antennas with an cmphasis on apcrture antennas. Terms such as E-plane, Hplane, TEOI, TEI1, and T M l l modc cxcitations arc used without definition. Array antennas are only explained with a few scntences. Hencc, a person without somc background on antcnnas would have some difficulty understand-

ing this chapter. Chapter 6 presents propagation considerations in satellite communications. This chapter explains stcp-by-step procedurcs to compute scveral types of propagation dcgradation caused by both thc ionosphere and troposphere, a s refercnced in International Telccommunication Union Radiocommunication Standardization Scctor (ITU-R) documcnts. Chapter 7 discusscs the interfercnce problem in salellite communications. As a solution lo interfercnce between satellite nctworks, the chapter mentions various modulation schemes, although thesc schcmes arc not explained auywhcrc beforc Chaptcr 9. Chapter 8 cxplains satellitc access tcchniques. Thc fundamental access schemcs - frcquencydivision multiple access (FDMA), time-division multiple access (TDMA), and code-division multiple acccss (CDMA) - arc vcry clciirly prcseiited and discussed. However, although the cxistence of hybrid multiplc access schemes (e.g., F-TDMA) is mcntioned, none of them arc explained anywherc in the book. This is an obvious shortcoming since scveral current systems

and most next-geucration systems will hc based im F-TDMA. Moreover, this chapter puts in thc same category with FDMA, TDMA, and CDMA, the socallcd packet (or random) acccss scheme. This is strange since FDMA, TDMA, and CDMA are means of partitioning the uplink capacity into different typcs of rcsource domains such as frequency, time, and code, and random acccss is not. This rcsource managemcnt elemcnt is only very briefly mcntioned in this book in spitc of its key rolc in any satellitc access scenario. Chapter 9 presents a very simple yct comprehcnsive explanation of modulation techniques. It is vcry clear and free of unnecessary mathematical detail. Similarly, in Chaptcr 10 a very clear explanation of channcl coding is prcscnted, although no mention is madc of Turbo coding. Part 3, composed of Chapters 11 through 15, prcsents an engincering analysis of a sa'tellitc communication systcm. Chapter 11 (togcther with Appcndix A) provides a detailed analysis of the overall satcllite link quality. (Continued onpage 50)

online access onZy www.comsoc.org/pubs/surveys Editor-in-chief: Roch Glitho, Ericsson Research Canada

IEEE Communications Surveys, the first electronically published journal of the IEEE Communications Society, serves the international community of communications researchers and professionals by providing a continuously-available source of peer-reviewed, comprehensive, leading-edge surveys covering a11 aclive areas of communications.

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IEEE Communicotions Surveys provides you the opportuniw to oublirh tutorioir and J U N ~ V I lo enhance VOW

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prdfear,onbI rta1ure. Topics of inlereit include, but ore not limited lo: .Network ond

The electronic medium allows rapid publication of up-to date survey articleS and the capability of electronic searching. Whether you are searching for ihdepth information about a familiar area or an introduction into a new area,

IEEE Communicotions Surveys aims to be your premier source.

Released quarterly. Available online only. Free access for members or non-members.

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IEEE CommunicationsMagazine * Sunc 2000

BOOK REVIEWS (Continued from puge 48)

Chapter 12 introduces the engineering issues related to the design of earth stations. After presenting a typical system configuration of an earth station, the chapter explains major subsystcms such as power amplifiers, low-noise amplifiers, ground communication equipment, and multiplex equipment. After a short discussion of cqnipment costs, a standard earth station design is presented. Chapters 13 and 14 explain the satellite itself, whilc the service module is presented in Chapter 13 and the communication module (payload) in Chapter 14. Both chapters a r c very comprehensive. They covcr almost all the aspects of engineering for communication satellites. However, the section on new payload is very short. Finally, Chapter 15 prescnts the current antenna technology employed both at earth stations and onboard the satellitc. Part 4, which is composed of Chapters 16 through 23, presents various applications of satellite communications. Chapter 16 discusses the overall network perspective with an emphasis

on the main network serviccs. Several networking issues such as local acccss, plesiochronous digital hierarchy (PDH), synchronous digital hierarchy (SDH), and asynchronous transfcr modc (ATM) are considercd, but the Internet is strangely absent on both the servicc and protocol fronts. Chapters 17 and t R explain digital audio and video broadcast by satellites in some detail. Thcse two chapters are very comprehensivc. Similarly, Chapters 19 and 20 present a very comprchensivc study of mobile satellite communications and satellite personal communication networks (SI'CN), respectively. Chapter 21 presents an introduction to satellite navigation. Very small aperture terminals (VSATs) are studicd in Chapter 22. Finally, military satellite communications is presented in Chaptcr 23. A typcal feature of the chapters in this part is that they are independent of each other. Thercfore, many issues are considered more than once in these chapters. Finally, Chapters 24 and 25, which make up part 5, prcscnt information on micro- and mini-satellitcs and a comprehensive discussion on future trends in

CHAIR OF TELECOMMUNICATIONS Faculty of Engineering The University, recognised internationally for excellence in teaching and research, is located centrally in Melbourne, a vibrant centre of Australian intellectual and cultural life. T h e Position: This Chair is located in the Department of Electrical and Electronic Engineering,Faculty of Engineering. The Perron:The new Professor will have a distinguished record in research and teaching in Telecommunications Engineering, consistent with the Department's research interests, and must demonstrate a strong background of successful interaction with industry and government organisations.

ROBUST SMART

MODULATION METHODS AND ANTENNAS I N WIRELESS

COMMUNICATIONS

T h e 6enefits:An attractive remuneration package is negotiable.

B R U N O P A T T A N , PRENTICE HALL, 2000, ISBN: 0-13-022029-9. 285

Durat1on:This Chair is offered on a continuing basis, subject t o satisfactory performance.

PAGES

Contact: Enquiries of an academic nature may be directed to Professor David Wood, the Dean. Faculty of Engineering. Telephone enquiries: +61 3 8344 6619; secure facsimile: +6 i 3 8344 7707; emaii: [email protected].

REVIEWER:NING YANG With the devclopment of wircless communications, many new communications technologies are nccded to enhance the capacity of wireless systems. This book, which consists of two parts, addresses some of thcse new tcchnologics. The first part of the book concentrates on thc modulation and signal processing techniques that arc popular in wireless communications; t h e second part focuses on antenna array tcchniqucs, the so-called smart antenna technologies. Chapter 1 provides a brief overview of wireless communications, including terrestrial and satellite systems. Chapter 2 deals with thc concepts of bandwidth-

Further information about the position. including details of the application procedure. condltionr of outside work, superannuation. travel and removal expenses, housing assistance and conditions of appointment, is available from the University Secretar? Please contact Ms Lydia Simonow,telephone:+61 3 8344 7528,recure facsimile: +61 3 8344 6897;email: [email protected] information is also available fMm Association of Commonwealth Universities (48277). 36 Gordon Square. London W C l H OPF (email: [email protected] fax:O20 7383 0368: tel: 020 7380 6706).This information is available on the internet: http:llwww.unlmelb.edu.aulExecServlSenio~appll"de~.ht~. Application to: University Secretary.The University of Melbaurne.Victoria 3010. Australia marked ("PERSONAL AND C O N F I D E N T I A L " and identified as Application 00110). Secure facsimile: +61 3 8344 6897. by 28 July 2000. The Council reserves the right to make no appointment o r t o fill the Chair by invitation a t any stage.

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satellite communications, respectively. Because of the editcd naturc of the book, many issues are discussed many times in different places. For instancc, the basic multiple acccss schemes (FDMA, TDMA, and CDMA) arc considcred in Chapters 8, 18, 22, and 23. Similarly, modulation tcchniqucs and channel coding are explained in Chapters 10, 18, 22, and 23. Digital audio broadcast (DAB) by satellite, to which the whole of Chapter 17 is dcvoted, is explained again at thc end of Chapter 18. In one way, thcsc repetitions allow the reader to read, on the same issue, different viewpoints from people working on different aspects of satellite communications. In general, the book is very clear and comprehensive. No mathematical equations are derived. Instead, their uses are demonstrated. Most of the chapters arc self-contained and indepcndent. The scope of the hook is very large; almost all aspects of current satellite communication systems are studied. Hence, the book keeps its promise in that it provides a quick start for someone who is new to the satellite communications business. However, tho quality of thc chapters is not uniform. Antenna theory should have becn explained in more detail in Chaptcr 5 . Satellite multiple access techniques (Chapter 8) should have been postponed until after Chapter 10. Finally, more details could have been given on resource managemcnt, Internet over satellite, and security.

THIaMs,nnF

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MELBOURNE

(Continued on page 52)

IEEE CommunicationsMagazine June 2000