fundamentals of digital rf communication 29

... The purpose of this chapter is to highlight a few of the key teststhat may be used to characterize the RF performance of a digital television system POWER MEASUREMENTS The measurement of power is ... rate of flow, Rf, of the water are known Thus The flow rate is often measured in gallons per minute, so that the constant ofproportionality (specific heat of water) is 0.264.2 Disadvantages of ... specific heat of the liquid is affected Water is an excellent medium for the conversion of RF energy to heat It iswell known that for every kilocalorie of added heat, the temperature of 1 kg of water...

Ngày tải lên: 14/08/2014, 16:20

... now sketch an intuitive proof of the capacity formula (6.1) While the formula refers to a continuous-time channel, both the proof of the capacity formula, and the kinds of constructions we typically ... problem of signal design for reliable communication now boils down to packing disjoint decod- ing spheres of radius r n = √ nN within a sphere of radius R n , as shown in Figure 6.2 The volume of ... munication system, both in terms of setting design goals and in terms of gaining intuition on design parameters (e.g., size of constellation to use) The goal of this chapter, therefore, is to...

Ngày tải lên: 31/01/2024, 20:26

... Trang 1Fundamentals of Digital CommunicationThis textbook presents the fundamental concepts underlying the design of modern digital communication systems, which include ... then, is the world going digital? I consider this issue after first discussing the components of a typical digital communication system. 1 Trang 201.1 Components of a digital communication systemConsider ... block diagram of a digital communication link depicted in Figure 1.1 I will now briefly discuss the roles of the blocks shown in the figure. Figure 1.1 Block diagram of a digital communication...

Ngày tải lên: 31/01/2024, 20:26

... Trang 1Fundamentals of Digital ElectronicsMarch 1998 Edition Part Number 321948A-01 Fundamentals of Digital Electronics Copyright Copyright © 1998 by ... circuit under test.Encryption of Digital Data Most data communication takes the form of ASCII characters The addition of a parity bit to 7-bit ASCII codes yield an 8-bit digital number Banking machines, ... Data SelectorAnother simple application of basic gates is the data selector, in which a single digital input selects one of two digital streams: Figure 1-10 A Digital Data Selector Built with Basic...

Ngày tải lên: 19/10/2013, 11:15

... Trang 2Fundamentals of Digital Imaging in MedicineTrang 3Fundamentals of Digital Imaging in Medicine1 3 Trang 4Roger Bourne, PhDDiscipline of Medical Radiation Sciences Faculty of Health Sciences ... The information content of a digital image depends on the number of pixels and the number of distinct intensities This figure illustrates the effect of reducing the number of intensity levels on ... movement of medical imaging into digital technology re-quires graduates in the medical radiation sciences to have a sound understanding ofthe fundamentals of digital imaging theory and image...

Ngày tải lên: 05/06/2014, 12:05

... Fundamentals of Digital Television Transmission. Gerald W. Collins, PE Copyright  2001 John Wiley & Sons, Inc. ISBNs: 0-471-39199-9 (Hardback); 0-471-21376-4 (Electronic) FUNDAMENTALS OF ... study of many reports and papers. This book is the result of that effort. If in some respect the presentation of any topic is incomplete, I take full responsibility. The implementation of digital ... claim originality for much of the material included in this book. In fact, the story of digital television builds on the many contributions of workers since the beginning of radio and television...

Ngày tải lên: 14/08/2014, 16:20

... the effect of antenna noise temperature, Ta, 6“Transmission Performance of ISDB-T,” ITU-R Document 11A/Jyy-E, May 14, 1999. 7 Yiyan Wu, “Performance Comparison of ATSC 8-VSB and DVB-T COFDM Transmission ... location allows determination of the C/N and the noise-limitedcoverage contour in the absence of multipath and interference Methods ofdetermining the average power of the received signal, Pr, are ... dBm.Adjusting these values for the UHF system gain of 29.4 dB results in an averagenoise floor of 100.4 dBm, a minimum of 101.3 dBm, and a maximum of 97.6 dBm The equivalent receiver input noise...

Ngày tải lên: 14/08/2014, 16:20

... TRANSMITTERS FOR DIGITAL TELEVISION1 The introduction of digital TV... both sides of this equation are polynomials of order N, the precorrection is properly set up when the coefficient of each ... TRANSMITTERS FOR DIGITAL TELEVISION technology, several of these functions may be implemented in digital circuitry The possibility of performing... not band limited However, the sum of these ... carriers The integral of the product of the 8 Ibid 57 COFDM Binary signals 1 1.00E-01 Probability of error 1.00E-02 1.00E- 03 1.00E-04 1.00E-05... Considerations for Digital Television,...

Ngày tải lên: 14/08/2014, 16:20

... filter of this type isshown in Figure 5-4 There is nearly a 120-ns delay variation at š3 MHz fromband center Figure 5-4 Group delay of filter for digital television (Data courtesy of Scott Durgin of ... ratio of a pair ofpolynomials defining the filter poles and zeros, and n is the number of poles orfilter order.2Transmission zeros occurring when the frequency is on the imaginaryaxis of the ... effects oftemperature variations If the cavity is made of a single type of metal, the change in resonant frequency will be very nearly directly proportional to the linearcoefficient of expansion of...

Ngày tải lên: 14/08/2014, 16:20

... length of line In general,the response tilt is small In mathematical terms, the slope of the frequencyresponse is the first derivative of the formula for attenuation with respect tofrequency, orft ... configuration could be a pair of 17.5- or 25-kW final amplifier Either ofthese might be a good choice, assuming the use of any one of the rigid coaxiallines For a TPO below 25 kW, a pair of 12.5-kW finals ... Attenuation of 6 1 8 -in 50-Z Corrugated Coaxial Cablebe supported with 8-in cable and antenna gain of 25 for U.S channels through 39 if the line length is 1000 ft or less The cutoff frequency of corrugated...

Ngày tải lên: 14/08/2014, 16:20

... the surface of a cylindrical pipe To illustrate the effect of the radiating element on the azimuth pattern of a circular array, consider a center-fed dipole This antenna may be thought of as ... amplitude of each element abovethe center is reduced from the amplitude of its next-lower adjacent neighbor by a fixed percentage; the amplitudes of the elements in the lower half of the arrayare ... tilt is verylow for depression angles of interest, as shown in Figure 7-18 Another benefit of the exponential distribution is the possibility of the absence of phase changes between adjacent lobes...

Ngày tải lên: 14/08/2014, 16:20

... Modification of the radiation resistance of a dipole in the presence of a groundplane is equivalent to the effect of the mutual impedance of a pair of paralleldipoles driven out of phase by equal ... sake of illustration, the results ofcalculation of the mutual impedance of parallel half-wavelength dipoles as a func-tion of separation are plotted in Figure 7-35 Note that the peak values of ... impedance of this circuit isZ D RrCj ωL  1ωC At the resonant angular frequency The values of the equivalent circuit elements RLC and Q are the quantities of interest for dipoles made of wires of different...

Ngày tải lên: 14/08/2014, 16:20

... responsible for propagation of digital television signals beyond the radio horizon. The magnitude of the diffracted signal is dependent on the type of surface. For example, a smooth surface such as calm ... The effect of surface roughness on signal strength may partially be understood in terms of diffraction. As the surface roughness increases, the effective reflection coefficient of the surface is ... at right angles to the direct vector. The rate of change of phase is independent of the direct signal but is proportional to the delay of the interfering signals. Maximum phase shift Maximum amplitude...

Ngày tải lên: 14/08/2014, 16:20

... CDMA network begins in Chapter with a review of the fundamentals of digital communications; the chapter emphasizes only those aspects of digital communication applicable to an IS-95 based system ... Wireless Communications: Principles and Practice, Englewood Cliffs, NJ: Prentice Hall, 1995 Yacoub, M D., Foundations of Mobile Radio Engineering, Books Britain, 1993 3 Fundamentals of Digital RF Communication ... a voice communication system, the source information is human speech; speech is inherently analog and must be converted (coded) to a digital form before it Fundamentals of Digital RF Communication...

Ngày tải lên: 27/05/2014, 03:49

... the performance of a system operating in the suggested conditions, and Section drives the conclusions of the paper BACKGROUND AND SCENARIO 2.1 Overview of DVB-S2 The second generation of DVB-S ... long and it is in the order of sev- Channel modelling The selection of a ModCod scheme for transmission is very decisive for the performance of the system in terms of net data rate, bit errors ... the standard deviation of the scintillation is also dependent on the intensity of the rain attenuation Within the remaining parts of this work the influence of the size of the safety margins with...

Ngày tải lên: 22/06/2014, 19:20

... of Removal Rate on Spares Performance, F100-100 Engine 77 Impact of One-Way Transportation Time on Spares Performance, ALQ-131 Pods 78 Impact of Initial Deployment on Spares Performance, ... 61 EnMasse Model of Engine Repair 70 Impact of One-Way Transportation Time on Spares Performance, F100-100 Engine 75 Impact of Initial Deployment on Spares Performance, F100-100 Engine ... A.11 Impact of Removal Rate on Spares Performance, ALQ-131 Pods 80 Comparison of Unit and Centrally Managed Deployments 95 Spares Performance, 24 F-16s and Spares 100 Spares Performance,...

Ngày tải lên: 29/03/2014, 16:20

... was shown in [29] that using a ratio of 80 instead of 16, could yield EEG source localization errors of an average of cm up to cm comes down to a soft-tissue to skull conductivity of 10 to 40 Poisson's ... Example9mesh of the human head used in BEM Example mesh of the human head used in BEM Triangulated surfaces of the brain, skull and scalp compartment used in BEM The surfaces indicate the different interfaces ... injection current at the surface electrodes) to build a conductivity profile of the human head in 3D While EIT is Page 24 of 29 (page number not for citation purposes) Journal of NeuroEngineering and...

Ngày tải lên: 19/06/2014, 10:20

... The authors of [11] investigated the effect of receiver I/Q imbalance on OFDM systems for frequency selective fading channels under the assumption of perfect channel knowledge and perfect receiver ... moderate CFO of 3% causes only a negligable degradation of SISO and SIMO OFDM link capacity The worst case performance in case of CFO = 10% is plotted to illustrate the lower sensitivity of the SIMO ... pilots that are inserted among the OFDM data symbols I/Q imbalance of direct conversion OFDM receivers directly translates to a mutual interference between each pair of subcarriers located symmetrically...

Ngày tải lên: 22/06/2014, 19:20

... which is often characterized in microcellular environments [14, 15] Even if [16] presents the analysis of the scenario of a direct line -of- sight (LOS) path, it has not considered the use of spatial ... maximization of signal to interference-plus-noise ratio (SINR) at the output of the beamformer RAKE In (7), u(1) = I(1) + I(1) + l l,si l,mai I(1) is a total interference plus noise for the lth path of ... second-order characterization j j of the spatial correlation between the array response vector of the kth user at jth path and the weight vector of user of interest at lth path, of which more detailed derivation...

Ngày tải lên: 23/06/2014, 00:20

... tRNALys,3 100 Percent of tRNA Lys,3 B 80 60 40 20 tRNALys,3 tRNAMet(e) tRNAMet(i) Figure Comparison of intracellular levels of tRNAMet(e) or tRNAMet(i) Comparison of intracellular levels of tRNAMet(e) ... The results of these studies are discussed with respect to the coordination of HIV-1 primer selection, viral translation and encapsidation of the genomic RNA Results Construction of HIV-1 proviruses ... The PBS of HXB2-Met(i) differs by 11 nucleotides from the PBS of HXB2-Met(e) (Figure 1) Infectivity of HIV-1 with PBS complementary to tRNAMet(e) or tRNAMet(i) To characterize the effects of the...

Ngày tải lên: 13/08/2014, 09:20