1. Chapter 4 Baseband Pulse Transmission
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2. Haykin/Communication Systems, 4th Ed
Chapter Outline
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3. Haykin/Communication Systems, 4th Ed
4.1 Introduction
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4. Haykin/Communication Systems, 4th Ed
4.2 Matched Filter
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5. Figure 4.1 Linear receiver.
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6. 4.2 Matched Filter (Continued)
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7. Haykin/Communication Systems, 4th Ed
Example
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8. Haykin/Communication Systems, 4th Ed
Figure 4.2 (a) Rectangular pulse. (b) Matched filter output. (c) Integrator output.
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9. Figure 4.3 Integrate-and-dump circuit.
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10. Haykin/Communication Systems, 4th Ed
4.3 Error Rate Due to Noise
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11. Haykin/Communication Systems, 4th Ed
Figure 4.4 Receiver for baseband transmission of binary-encoded PCM wave using polar NRZ signaling.
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12. 4.3 Error Rate Due to Noise (C’d)
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13. 4.3 Error Rate Due to Noise (C’d)
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14. 4.3 Error Rate Due to Noise (C’d)
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15. 4.3 Error Rate Due to Noise (C’d)
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16. 4.3 Error Rate Due to Noise (C’d)
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17. 4.3 Error Rate Due to Noise (C’d)
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18. Haykin/Communication Systems, 4th Ed
Figure 4.5 Noise analysis of PCM system. (a) Probability density function of random variable Y at matched filter output when 0 is transmitted. (b) Probability density function of Y when 1 is transmitted.
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19. Figure 4.6 Probability of error in a PCM receiver.
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20. 4.4 Intersymbol Interference
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21. 4.4 Intersymbol Interference (C’d)
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22. 4.4 Intersymbol Interference (C’d)
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23. Figure 4.7 Baseband binary data transmission system.
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24. Haykin/Communication Systems, 4th Ed
4.5 Nyquist’s Criterion
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25. 4.5 Nyquist’s Criterion (Cont’d)
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26. 4.5 Nyquist’s Criterion (Cont’d)
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27. 4.5 Nyquist’s Criterion (C’d)
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28. Figure 4.8 (a) Ideal magnitude response. (b) Ideal basic pulse shape.
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29. Haykin/Communication Systems, 4th Ed
Figure 4.9 A series of sinc pulses corresponding to the sequence
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30. 4.5 Nyquist’s Criterion (C’d)
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31. 4.5 Nyquist’s Criterion (C’d)
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32. Haykin/Communication Systems, 4th Ed
Figure 4.10 Responses for different rolloff factors. (a) Frequency response. (b) Time response.
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33. 4.6 Correlative-Level Coding
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34. 4.6 Correlative-Level Coding (Cd)
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35. 4.6 Correlative-Level Coding (Cd)
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36. 4.6 Correlative-Level Coding (Cd)
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37. 4.6 Correlative-Level Coding (Cd)
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38. Figure 4.11 Duobinary signaling scheme.
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39. Haykin/Communication Systems, 4th Ed
Figure 4.12 Frequency response of the duobinary conversion filter. (a) Magnitude response. (b) Phase response.
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40. Figure 4.13 Impulse response of the duobinary conversion filter.
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41. Haykin/Communication Systems, 4th Ed
Figure 4.14 A precoded duobinary scheme; details of the duobinary coder are given in Figure 4.11.
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42. Haykin/Communication Systems, 4th Ed
Figure 4.15 Detector for recovering original binary sequence from the precoded duobinary coder output.
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43. 4.6 Correlative-level Coding
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44. 4.6 Correlative-Level Coding (Continued)
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45. Figure 4.16 Modified duobinary signaling scheme.
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46. Haykin/Communication Systems, 4th Ed
Figure 4.17 Frequency response of the modified duobinary conversion filter. (a) Magnitude response. (b) Phase response.
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47. Haykin/Communication Systems, 4th Ed
Figure 4.18 Impulse response of the modified duobinary conversion filter.
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48. 4.6 Correlative-Level Coding (Cd)
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49. 4.6 Correlative-Level Coding (Continued)
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50. Figure 4.19 Generalized correlative coding scheme.
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51. 4.7 Baseband M-ary PAM Transmission
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52. Haykin/Communication Systems, 4th Ed
Figure 4.20 Output of a quaternary system. (a) Waveform. (b) Representation of the 4 possible dibits, based on Gray encoding.
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53. 4.8 Digital Subscriber Lines
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54. 4.8 Digital Subscriber Lines (C’d)
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55. 4.8 Digital Subscriber Lines (C’d)
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56. 4.8 Digital Subscriber Lines (C’d)
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57. Haykin/Communication Systems, 4th Ed
Figure 4.21 Block diagram depicting the operational environment of digital subscriber lines.
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58. Haykin/Communication Systems, 4th Ed
Figure 4.22 Full-duplex operation using (a) time compression multiplexing, and (b) echo-cancellation.
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59. Haykin/Communication Systems, 4th Ed
Figure 4.23 Simplified circuit of hybrid transformer. For the bridge to be balanced, the reference impedance Zref should equal the line impedance zl.
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60. Haykin/Communication Systems, 4th Ed
Figure 4.24 (a) Near-end crosstalk (NEXT). (b) Far-end crosstalk (FEXT).
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61. Figure 4.25 Model of twisted-pair channel.
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62. 4.8 Digital Subscriber Lines (C’d)
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63. Haykin/Communication Systems, 4th Ed
Figure 4.26 (a) Illustrating the different band allocations for an FDM-based ADSL system. (b) Block diagram of splitter performing the function of multiplexer or demultiplexer. Note: both filters in the splitter are bidirectional filters.
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64. Haykin/Communication Systems, 4th Ed
4.9 Optimum Receiver
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65. 4.9 Optimum Receiver (Cont’d)
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66. 4.9 Optimum Receiver (Cont’d)
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67. 4.9 Optimum Receiver (Cont’d)
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68. Haykin/Communication Systems, 4th Ed
Figure 4.27 Optimum linear receiver consisting of the cascade connection of matched filter and transversal equalizer.
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69. 4.10 Adaptive Equalization
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70. Figure 4.28 Block diagram of adaptive equalizer.
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71. 4.10 Adaptive Equalization (C’d)
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72. 4.10 Adaptive Equalization(C’d)
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73. Haykin/Communication Systems, 4th Ed
Figure 4.29 Signal-flow graph representation of the LMS algorithm involving the kth tap weight.
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74. Haykin/Communication Systems, 4th Ed
Figure 4.30 Illustrating the two operating modes of an adaptive equalizer: For the training mode, the switch is in position 1; and for the tracking mode, it is moved to position 2.
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75. Haykin/Communication Systems, 4th Ed
Figure 4.31 Impulse response of a discrete-time channel, depicting the precursors and postcursors.
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76. Figure 4.32 Block diagram of decision-feedback equalizer.
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77. 4.11 Computer Experiment: Eye Diagram
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78. Figure 4.33 Interpretation of the eye pattern.
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79. Haykin/Communication Systems, 4th Ed
Figure 4.34 (a) Eye diagram for noiseless quaternary system. (b) Eye diagram for quaternary system with SNR  20 dB. (c) Eye diagram for quaternary system with SNR  10 dB.
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80. Haykin/Communication Systems, 4th Ed
Figure 4.35 (a) Eye diagram for noiseless band-limited quaternary system: cutoff frequency fo  Hz. (b) Eye diagram for noiseless band-limited quaternary system: cutoff frequency fo  0.5 Hz.
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81. Haykin/Communication Systems, 4th Ed
Figure P4.1
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82. Haykin/Communication Systems, 4th Ed
Figure P4.2
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83. Haykin/Communication Systems, 4th Ed
Figure P4.4
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84. Haykin/Communication Systems, 4th Ed
Figure P4.12
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85. Haykin/Communication Systems, 4th Ed
Figure P4.23
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86. Haykin/Communication Systems, 4th Ed
Figure P4.27
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87. Haykin/Communication Systems, 4th Ed
Figure P4.31
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88. Haykin/Communication Systems, 4th Ed
Figure P4.32
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89. Haykin/Communication Systems, 4th Ed
Figure P4.34
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