theory of spread spectrum communications
Tài liệu PRINCIPLES OF SPREAD-SPECTRUM COMMUNICATION SYSTEMS ppt
... summations to weobtainThe information-weight spectrum or distribution is defined asIn terms of this distribution, (1-110) becomesPRINCIPLES OF SPREAD- SPECTRUM COMMUNICATIONSYSTEMS32CHAPTER ... number of sequences that can be obtained by changing any of the nonzero symbolsto zeros is where if For a specified value of it is necessarythat to ensure a sequence of weight The number of sequencesthat ... codewords of the total weight of all the symbols in a fixed position isthe same regardless of the position and is equal to The total weight of all the information symbols in is Therefore,Optimal soft-decision...
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Theory of stochastic local area channel modeling for wireless communications
... domain, X(f )issimplyacopyofthe spectrum ˜X(f) shifted to a center frequency of f =+fcand a mirror copy of ˜X(f)shiftedto a center frequency of f = −fc.The operation of modulation can be defined ... SummaryofAngleSpectrumConcepts 1245.2 FadingRateVariance 1275.2.1 DefinitionofaRateVariance 1275.2.2 Fundamental Spectral Spread Theorem . . . 1295.3 MultipathShapeFactors 1305.3.1 DefinitionofShapeFactors ... ProperLimitingBehavior 1174.B.4 PreservationoftheSecondMoment 1175 The Angle Spectrum 1185.1 AngleSpectrumConcepts 1195.1.1 DefinitionoftheAngleSpectrum 1195.1.2 MappingAnglestoWavenumbers...
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Trải phổ SPREAD SPECTRUM
... dùng cho thông tin vệ tinh trong CDMA. Trải phổ nhảy tần Frequency Hopping Spread Spectrum Frequency Hopping Spread Spectrum (FHSS)Được phát minh bởi nữ diễn viên Hollywood Hedy Lamarr, ... thu và máy phát đều có bộ tạo mã PN gồm k chíp mã tương ứng với 1 từ tần sốDirect Sequence Spread Spectrum TransmitterVídụ CDMACác ưu nhược điểm FHSS Ưu điểm :Giảm fading đa đường do ... phát hiệnNhảy tần nhanh (Fast FHSS) (M=4, k=2)Điều chế và giải điều chếDirect Sequence Spread Spectrum TransmitterTrải phổ nhảy tầnDẫy PN dùng để điều khiển (xác định) mẫu nhảy. Tốc...
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Lecture 4 - Spread Spectrum Technologies
... 43OFDMFebruary 2005 Copyright 2005 All Rights Reserved 3 Spread Spectrum ● Spread spectrum is a communication technique that spreads a narrowband communication signal over a wide range of ... which employs OFDM in the 2.4 GHz range February 2005 Copyright 2005 All Rights Reserved 6 Spread Spectrum Use ● In the 1980s FCC implemented a set of rules making Spread Spectrum available ... the imaginary or quadrature axis of the complex plane.February 2005 Copyright 2005 All Rights Reserved 4Narrowband vs Spread Spectrum FrequencyPower Spread Spectrum (Low Peak Power)Narrowband(High...
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The theory of financial intermediation: An essay on what it does (not) explain
... which are seen as a form of market imperfection. Themainstream theory of the firm evolved under the paradigm of the agency theory and the transaction costs theory as a theory of economic organizationrather ... amendment of the existing theory of financial intermediation.The structure of this paper is as follows. First, we introduce the foundations of the modern literature of financial intermediation theory. ... review the doctrines of the theory of financial intermediation.2Theseare specifications, relevant to the financial services industry, of the agency theory, and the theory of imperfect or asymmetric...
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Circuit theory of finance and the role of incentives in financial sector reform
... efficiently, the reputationalcapital of an agent must equal the present value of the stream of future profits, or franchise value, of her business.The concept of reputational capital is meaningful ... Structural implications of CTFCircuit theory of finance (CTF) bears important implications in terms of financial marketstructure, microeconomic imbalances, and the role of saving for economic ... on the basis of verifiable and tested information. Information providers might be eitherprofit or non-profit outfits.Providers of customized information might operate for a profit and sell...
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Multi-Carrier and Spread Spectrum Systems
... multi-carrier, spread spectrum and multi-carrier spread spectrum systems.We hope that this book will contribute to a better understanding of the principles of multi-carrier and spread spectrum and ... fundamentals of today’s wireless communications. First adetailed description of the radio channel and its modeling are presented, followed by theintroduction of the principle of OFDM multi-carrier ... isessential for a better understanding of the idea behind the combination of OFDM withthe spread spectrum technique, which is briefly introduced in the last part of this chapter.1.1 Radio Channel...
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Spread spectrum
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Complexity Theory of Transforms in Signal Processing
... behavior of the number of multiplications is also quadratic.Convolution algebras are derived from algebras of polynomials. Given a polynomial P (u) of degree D, one can define an algebra of dimension ... IntroductionComplexity theory of computation attempts to determine how “inherently” difficult are certaintasks. For example, how inherently complex is the task of computing an inner product of twovectors of length ... original proof); the reference I like best is Adrian Albert’s book [1]. Thetheorem asserts that the tensor product of fields is isomorphic to a direct sum of fields, and theproof of the theorem...
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Theory of rapid granular flows Isaac Goldhirsch
... number of collisions per particle (a measure of time), given byτ ≡t0T1/2(t)dt.The use of this measure of time renders the equations of motion linear.The three eigenvalues of this ... of the linearised Boltzmann equation, at each order in theexpansion. Since the solution of equations of the type of Eq. (12.22) is determinedup to the addition of an arbitrary combination of ... shearedsystem is of a much higher granular temperature than that expected on the basis of steady-state solutions of the corresponding hydrodynamic equations. In this case the208 Theory of rapid granular...
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Tài liệu Theory of Inventive Problem Solving pdf
... into a theory of inventive problem solving which he named TRIZ.3.0 TRIZ: The Theory of Inventive Problem SolvingThere are a number of laws in the theory of TRIZ. One of them is the Law of Increasing ... Xerox Corporation 7.0 TRIZ SoftwareBecause TRIZ is built on a database of hundreds of thousands of patents, principles, operators, contradictions, etc. use of software helps engineers with ... nonmoving object 3. Length of moving object 4. Length of nonmoving object 5. Area of moving object 6. Area of nonmoving object 7. Volume of moving object 8. Volume of nonmoving object 9. Speed...
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Tài liệu Introduction to Communication Systems, The Theory of Probability ppt
... gr qrw h{lvw Wkh sk|vlfdo phfkdqlvpv gulylqj wkh sureohp duh vr frpsolfdwhg wkdw wkh gluhfw fdofxodwlrq ri wkhsureohp lv qrw ihdvleoh Wkhuh h{lvwv vrph edvlf lqghwhuplqdf| lq wkh sk|vlfdo...
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Tài liệu Spread Spectrum (SS) pptx
... use of OVSF codes is thus a key factor in the high degree of service flexibility of the W-CDMA air interface.Let CN be a matrix of size NxN and denote the set of N binary spreading codes of ... requiring spread spectrum modulation:DSSS (Direct Sequence Spread Spectrum) and FHSS (Frequency Hopping Spread Spectrum) .Only the RF transmission has significant presence in the market.1MbpsSpreadingdtpntDBPSK11 ... Sint-Katelijne-WaverBelgiumwww.denayer.be Spread Spectrum (SS)applicationsir. J. Meeljme@denayer.wenk.beStudiedag Spread Spectrum 6 okt. ’99In the period of nov. 1997 - nov. 1999 a Spread Spectrum project was...
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Tài liệu The General Theory of Employment, Interest, and Money docx
... EFFICIENCY OF CAPITAL 12. THE STATE OF LONG-TERM EXPECTATION 13. THE GENERAL THEORY OF THE RATE OF INTEREST 14. THE CLASSICAL THEORY OF THE RATE OF INTEREST o APPENDIX ON THE RATE OF INTEREST ... advantages of private and national thrift, the traditional attitude towards the rate of interest, the classical theory of unemployment, the quantity theory of money, the unqualified advantages of laissez-faire ... and of the trade cycle. Another feature, especially characteristic of this book, is the theory of the rate of interest. In recent times it has been held by many economists that the rate of current...
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