Clear digital communication plan v3

Principles of Digital Communication Systems and Computer Networks

... đặc biệt để khắc phục ảnh hưởng nhiễu Hai khía cạnh đưa Shannon báo “A Maththemathical Theroy of Communication xuất năm 1948 Bell System Technical Journal - nơi đưa lý thuyết thông tin Shannon ... định lý quan trọng cho kỹ sư truyền thông Tài liệu tham khảo C E Shannon "A Mathematical Theory of Communication. " Bell System Technical Journal, Vol 27, 1948 Tất kỹ sư truyền thông phải đọc báo ... thức, entropy H = 4.07 bit/ký hiệu Lưu ý: Hãy xem xét câu sau: "I not knw wheter this is undrstandble." Mặc dù thực tế số chữ tích câu bạn làm câu văn Nói cách khác, có nhiều khả dự phòng văn...

Digital communication receivers P2 - P2

... timing error e = E - Similarly, it follows that E[N(t; E, EI)N(t + u; E, i)] = E[N(t - EIT; E - f, 0) N(t + u - iT; E - i, 0)] = E[N(O; & - i, 0) N(u; E - i, O)] = &(u;& - e> ( 2-3 9) so that also ... secondterm in ( 2-5 7) is well approximatedby +m(k@) J - b(t)) (-& v(t; e,))dtZ f S$,f’(O; e,) ru2 IH@)12 g -0 0 ( 2-6 2) where d2 Sg)(O; e,) = ~WW,) w= o ( 2-6 3) The right-hand side of ( 2-6 2) is proportional ... Indeed,as 5’1 0) is nearly fiat within the con(w; Baseband Communications 104 log var(i, j) T -6 .0 -7 .0 -8 .0 ' -3 .0 I -2 .0 ' b lw(BLT) -1 .0 Figure 2-2 5 Timing Error Varianceas a Function of Loop Bandwidth...

Digital communication receivers P3

... Digital Communication Receivers: Synchronization, Channel Estimation, and Signal Processing Heinrich Meyr, ... transmissionrate of communication? (answer: the channel capacity C) We gain a considerableinsight comparingtheseboundarieswith the performance of any communication system design The communicationmodel ... Benedettoand E Biglieri and V Castellani, Digital Transmission Theory Englewood Cliffs, NJ: Prentice-Hall, 1987 [2] E A Lee and D G Messerschmitt, Digital Communication Boston: Kluwer Academic,...

Digital communication receivers P4

... by Digital Interpolation We claimed earlier that there is no penalty associated with digitally processing a continuous-time band-limited signal Mathematically, the equivalence of analog and digital ... obtained by digital interpolation of the samples (x(kT,)} The frequency response of the digital interpolation filter is x(kT, I2 I < 1/2T, (4-42) Timing recovery can thus be done by digital interpolation ... D G Messerschmitt, Digital Communications Boston: Kluwer Academic, 1988 [2] H L van Trees, Detection, Estimation, and Modulation Theory New York: Wiley, 1968 4.3 Optimum ML Receivers In this section...

Digital communication receivers P5

... lowpass process Due to the equivalence of digital and analog signal processing, differentiation can be done in the digital domain The impulse response of the digital differentiator is defined in the ... 5-12 we show a first structure of a digital timing error detector The signal is sampled at a rate l/Td, processed in a digital matched filter followed by a digital interpolator These are the familiar ... answer let us for a moment forget that we intend to process the information digitally Because of the equivalence of digital and analog signal processing, we know that z(nT + ET) can be obtained...

Digital communication receivers P6 - P1

... - j*(kTs -+ -& -ET) T ,-j(e+kTasz) jr&$ mnT-.cT) T ,j(e+kT,n) k=-Co = (N2’2 E[az an] g n =-( N-1)/2 = (N-1)/2 C n =-( N-l)/2 where i(t) E[ai an] & Jm j*(t-rzT-ET) i(t-raT-ET) dt ( 6-4 6) -CO (-jw) G*(w) ... ?I =-( N-1)/2 n=(N- = (-T) such that the cross g*(t-nT-ET) tj(t-nT-ET) term dt 1)/2 c 7a=(N- & / (jw) lG(w)j2 dw s ta =-( N-l)/2 = (-j) s-CO ( 6-5 5) 1)/2 c E[a,az] F & /u IG(w)l” dw s n =-( N-1)/2 ( 6-5 6) ... unspecified With 7a=(N- Sf(kT,) c = 1)/2 a, g&T, - nT - ET) ej(nkTa+e) ( 6-3 3) n =-( N-1)/2 from ( 4-9 6) it follows that dS ds, de1 Q dea a Xg (N-1)/2 c a, g(kTs -nT-ET) e+j(nkTB+e) n =-( N-1)/2 ( 6-3 4) holds...

Digital communication receivers P6 - P2

... :: -\ \‘ m /=J B B CRB 4-QAM 16-QAM N 2-> infinity 100 ., .- w _ _ _ _ _ -. _ .- - o-2 -? : q I 1 0-4 1"" I 0 , I 2b lb Es/No I I 3b [dB] Figure 6-5 Linearized Tracking Performance of NDA-ML ... Cramer-Rao bound (CRB) Figure 6-l Linearized Tracking Performance of DD-ML Carrier Synchronizer for QPSK 360 Performance Analysis of Synchronizers 0.8 [ - - - - Es/NO=OdB -0 .8 - - - Es/NO=lOdB - ... Taking ( 6-6 8) into account, ( 6-1 50) yields =T Re I( c a$+ h(mT-eT) 7n + A$ c ulc-na h’(mT-eT) m )( + Ni ( 6-1 51) )I where Nk = N(kT + dT) exp (-joa) ( 6- 152) Ni = N’( IcT + ZT) exp (-j&) ( 6-1 53)...

Digital communication receivers P7

... Bibliography [l] W C Lindsey and M K Simon, Telecommunication Systems Engineering Englewood Cliffs, NJ: Prentice-Hall, 1973 [2] J G Proakis, Digital Communications New York: McGraw-Hill, 2nd ed., ... Figure 7-12 it follows that the latter effect dominates 7.7 Coded Transmission Today most practical communication systems employ some form of coding This raises the question of how random carrier ... AES-14, pp 608-615, July 1978 [8] N Liskov and R Curtis, “Performance of Coherent Phase and Amplitude Digital Modulations with Carrier Recovery Noise,” IEEE Trans Commun., vol COM-35, pp 972-976, Sept...

Digital communication receivers P8

... frequencyadjusted samples of (ICT,) e-JSlkT* are fed to a digital lowpass filter Note that the decimation rate T,, /Y& and the bandwidth of the digital lowpass filter have to be properly selected according ... with Application to Burst Digital Transmission,” IEEE Trans Info Theory, pp 543-551, July 1983 F Classen, H Meyr and P Sehier, “An All Feedforward Synchronization Unit for Digital Radio,” ProceedingsVTC’ ... algorithm discussed in [l] fail in such cases Bibliography [l] F M Gardner, “Frequency Detectors for Digital Demodulators Via Maximum Likelihood Derivation,” ESA-ESTEC Final Report: Part 2, ESTEC Contract...

Digital communication receivers P9

... mathematical sense) and decimator control; see also [9, lo] Digital receivers capable of operating at variable data rates are of interest in digital broadcasting systems [ 111 They require an interactive ... “Interpolation in Digital Modems - Part II: Implementation and Performance,” ZEEE Trans Commun., vol COM-41, pp 998-1008, June 1993 European Telecommunications Institute, Digital Broadcasting ... and Sufficient Statistics for Digital Receivers, ” IEEE Trans Commun., pp 3208-3214, Dec 1994 U61 V Zivojnovic and H Meyr, “Design of Optimum Interpolation Filters for Digital Demodulators,” IEEE...

Digital communication receivers P10

... of acceptable accuracy For this reason, quantization effects in digital receivers are distinctly different than in other areas of digital signal processing (such as audio signal processing), which ... hardware complexity as well 10.9.5 Punctured Codes Current telecommunication standards, e.g., digital video broadcasting (DVB [28]) or digital audio broadcasting (DAB [29]) usually support a variety ... Implementation [29] European Telecommunication Standard ETS 300 401, “Radio Broadcasting Systems; Digital Audio Broadcasting (DAB) to Mobile, Portable and Fixed Receivers, ” Sophia Antipolis Cedex,...

Tài liệu Digital communication receivers P11 ppt

... Plenary, Chicago, IL, June 18, 1992 [3] J Cr Proakis, Digital Communications New York: McGraw-Hill, 1989 [4] H Meyr, “Signal Processing in Digital Receivers: Model, Algorithm, Architecture,” in Proc ... short time frame 11.2 Digital Transmission over Continuous-Time and Discrete-Equivalent Fading Channels 11.2.1 Transmission over Continuous-Time Fading Channels In digital communications over linear ... Bibliography [l] R Steele, “An Update on Personal Communications,” IEEE Communications Magazine, vol 30, no 12, pp 30-3 1, Dec 1992 [2] B Frankel, “Wireless Data Communications - Taking Users into the Future.”...

Tài liệu Digital communication receivers P12 doc

... (12-27) and (12-37) [ML] and (12-31) and (12-43) [MAP] can serve as the basis for deriving simplified receivers that can actually be implemented MAP Dynamic Sync Parameter Estimation via ML Estimation ... (Boston, MA), pp 235-239, Oct 1992 El R Raheli, A Polydoros, and C K Tzou, “Per-Survivor Processing,” Digital Signal Processing, vol 3, pp 175-187, July 1993 [7] R Raheli, A Polydoros, and C K Tzou, ... Detection, Estimation, and Modulation Theory - Part I New York: Wiley, 1968 [14] T Kailath, “Optimum Receivers for Randomly Varying Channels,” in Proc 4-th London Symposium on Information London, pp...

Tài liệu Digital communication receivers P13 doc

... Ys;k through a systemsof equations[eqs (13-32) and (13-34)] 13.4 Spread Spectrum Communication In digital radio communications, spread-se&rum techniques, particular, (SS) in code division multiple ... A J Viterbi, “Wireless Digital Communication: A View Based on Three Lessons Learned,” IEEE Communic Mugaz., pp 33-36, Sept 1991 [2] H Meyr and R Subramanian, “Advanced Digital Receiver Principles ... Fechtel and H Meyr, “Parallel Block Detection, Synchronization and Hypothesis Decision in Digital Receivers for Communications over Frequency-SelectiveFading Radio Channels,” in Proc GZobecom/CTMC,...

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