... dùng cho thông tin vệ tinh trong CDMA. Trải phổ nhảy tần Frequency Hopping Spread Spectrum Frequency Hopping SpreadSpectrum (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 SpreadSpectrum 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 SpreadSpectrum TransmitterTrải phổ nhảy tầnDẫy PN dùng để điều khiển (xác định) mẫu nhảy. Tốc...
... 43OFDMFebruary 2005 Copyright 2005 All Rights Reserved 3 Spread Spectrum ● Spreadspectrum 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...
... which are seen as a form of market imperfection. Themainstream theoryof the firm evolved under the paradigm of the agency theory and the transaction costs theory as a theoryof economic organizationrather ... amendment of the existing theoryof 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 theoryof financial intermediation.2Theseare specifications, relevant to the financial services industry, of the agency theory, and the theoryof imperfect or asymmetric...
... 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 theoryof 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...
... 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...
... multi-carrier, spreadspectrum and multi-carrier spread spectrum systems.We hope that this book will contribute to a better understanding of the principles of multi-carrier and spreadspectrum and ... isessential for a better understanding of the idea behind the combination of OFDM withthe spreadspectrum technique, which is briefly introduced in the last part of this chapter.1.1 Radio Channel ... 1.(1.28)−1−0.500.51Normalized frequency 100−10−20−30Power spectral density spectrum of 1st sub-channelOFDM spectrum Figure 1-5 OFDM spectrum with 16 sub-carriersContents ix4.3.8 Blind and Semi-Blind...
... 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 theoryof 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...
... 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 Theoryof rapid granular...
... into a theoryof inventive problem solving which he named TRIZ.3.0 TRIZ: The Theoryof Inventive Problem SolvingThere are a number of laws in the theoryof 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...
... 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 spreadspectrum 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 SpreadSpectrum project was...
... EFFICIENCY OF CAPITAL 12. THE STATE OF LONG-TERM EXPECTATION 13. THE GENERAL THEORYOF THE RATE OF INTEREST 14. THE CLASSICAL THEORYOF 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 theoryof unemployment, the quantity theoryof money, the unqualified advantages of laissez-faire ... and of the trade cycle. Another feature, especially characteristic of this book, is the theoryof the rate of interest. In recent times it has been held by many economists that the rate of current...