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Introduction to digital communications.

Francisco J. Escribano
April 30, 2018
Technology
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40

Introduction to digital communications.

Slides for an undergraduate course on Digital Communications.

Francisco J. Escribano

April 30, 2018
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Transcript

  1. Francisco J. Escribano, 2017-18 DIGITAL COMMUNICATIONS Block 1 Introduction to

    Digital Communications

  2. 2 Digital Communications: introduction

  3. 3 Digital Communications: introduction COMMUNICATION THEORY

  4. 4 Digital Communications: introduction COMMUNICATION THEORY BASIC CONCEPTS

  5. 5 Digital Communications: introduction COMMUNICATION THEORY DIGITAL COMMUNICATIONS BASIC CONCEPTS

  6. 6 Digital Communications: introduction COMMUNICATION THEORY DIGITAL COMMUNICATIONS BASIC CONCEPTS

    ADVANCED CONCEPTS

  7. 7 Digital Communications: introduction COMMUNICATION THEORY DIGITAL COMMUNICATIONS BASIC CONCEPTS

    ADVANCED CONCEPTS

  8. 8 Digital Communications: introduction COMMUNICATION THEORY DIGITAL COMMUNICATIONS COMMUNICATION SYSTEMS

    BASIC CONCEPTS ADVANCED CONCEPTS

  9. 9 Digital Communications: introduction COMMUNICATION THEORY DIGITAL COMMUNICATIONS MOBILE COMMUNICATIONS

    COMMUNICATION SYSTEMS BASIC CONCEPTS ADVANCED CONCEPTS

  10. 10 Digital Communications: introduction COMMUNICATION THEORY DIGITAL COMMUNICATIONS RADIATION AND

    RADIOCOMMUNICATION MOBILE COMMUNICATIONS COMMUNICATION SYSTEMS BASIC CONCEPTS ADVANCED CONCEPTS

  11. 11 Digital Communications: introduction COMMUNICATION THEORY COMMUNICATION CIRCUITS DIGITAL COMMUNICATIONS

    RADIATION AND RADIOCOMMUNICATION MOBILE COMMUNICATIONS COMMUNICATION SYSTEMS BASIC CONCEPTS ADVANCED CONCEPTS

  12. 12 Digital Communications: introduction • Basic texts: – Bernard Sklar,

    Digital Communications, 2001, Prentice Hall (Chapter 1). – Simon Haykin, Communication Systems, 2010, Wiley (Background and preview). – John G. Proakis, Masoud Salehi, Digital Communications, 2008, McGraw-Hill (Chapter 1).

  13. 13 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers

  14. 14 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers

  15. 15 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers

  16. 16 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers Data Stream

  17. 17 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers Data Stream Data Stream

  18. 18 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers MEDIUM Data Stream Data Stream

  19. 19 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers MEDIUM Data Stream Data Stream

  20. 20 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers PHY (1) PHY (1) MEDIUM Data Stream Data Stream

  21. 21 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers PHY (1) MAC (2) (<DLL) PHY (1) MAC (2) (<DLL) MEDIUM Data Stream Data Stream

  22. 22 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers PHY (1) MAC (2) (<DLL) PHY (1) MAC (2) (<DLL) MEDIUM Data Stream Control Control Data Stream

  23. 23 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers PHY (1) MAC (2) (<DLL) PHY (1) MAC (2) (<DLL) MEDIUM Data Stream Control Control Data Stream

  24. 24 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers PHY (1) MAC (2) (<DLL) PHY (1) MAC (2) (<DLL) MEDIUM Digital Communications Data Stream Control Control Data Stream

  25. 25 Digital Communications: introduction • Logical/functional organization of communications ⇒

    layers PHY (1) MAC (2) (<DLL) PHY (1) MAC (2) (<DLL) MEDIUM Telematics Digital Communications Data Stream Control Control Data Stream

  26. 26 Digital Communications: introduction • Before proceeding further... – All

    this is about... transferring information • Some issues: – Can we precisely define information? – How can it and its quality be measured? – Are there any limitations to the amount of information we can transfer? • And the answer is...

  27. 27 Digital Communications: introduction • Before proceeding further... – All

    this is about... transferring information • Some issues: – Can we precisely define information? – How can it and its quality be measured? – Are there any limitations to the amount of information we can transfer? • And the answer is... ?

  28. 28 Digital Communications: introduction • Before proceeding further... – All

    this is about... transferring information • Some issues: – Can we precisely define information? – How can it and its quality be measured? – Are there any limitations to the amount of information we can transfer? • And the answer is... INFORMATION THEORY (Block 2) Source: Wikipedia !

  29. 29 Digital Communications: introduction • What are the main functions

    carried out at the physical layer?

  30. 30 Digital Communications: introduction • What are the main functions

    carried out at the physical layer?

  31. 31 Digital Communications: introduction • What are the main functions

    carried out at the physical layer? WIFI CARD in ADSL modem

  32. 32 Digital Communications: introduction • What are the main functions

    carried out at the physical layer? WIFI CARD in ADSL modem Radio frequency -RF (analog)

  33. 33 Digital Communications: introduction • What are the main functions

    carried out at the physical layer? WIFI CARD in ADSL modem Radio frequency -RF (analog) Upper layers (2,3...)

  34. 34 Digital Communications: introduction • What are the main functions

    carried out at the physical layer? WIFI CARD in ADSL modem Radio frequency -RF (analog) Base- band (digital) Upper layers (2,3...)

  35. 35 Digital Communications: introduction • What are the main functions

    carried out at the physical layer? WIFI CARD in ADSL modem Radio frequency -RF (analog) Base- band (digital) Upper layers (2,3...) • Adaptation to the medium. • Information protection. • Sharing resources. • Signal generation. • Interface between RF and upper layers. • Evaluation and compensation of channel distortions. • …...........................................................

  36. 36 Digital Communications: introduction • What are the main functions

    carried out at the physical layer? WIFI CARD in ADSL modem Radio frequency -RF (analog) Base- band (digital) Upper layers (2,3...) • Adaptation to the medium. • Information protection. • Sharing resources. • Signal generation. • Interface between RF and upper layers. • Evaluation and compensation of channel distortions. • …...........................................................

  37. 37 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially.

  38. 38 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially.

  39. 39 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially.

  40. 40 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. PHY (1) TX

  41. 41 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) PHY (1) TX

  42. 42 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) PHY (1) TX

  43. 43 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX

  44. 44 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX

  45. 45 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX CHANNEL 1 Performance (1)

  46. 46 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX CHANNEL 1 Performance (1)

  47. 47 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX CHANNEL 1 Performance (1) CHANNEL 2 Performance (2)

  48. 48 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX CHANNEL 1 Performance (1) CHANNEL 2 Performance (2)

  49. 49 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX CHANNEL 1 Performance (1) CHANNEL 2 Performance (2) CHANNEL 3 Performance (3)

  50. 50 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX CHANNEL 1 Performance (1) CHANNEL 2 Performance (2) CHANNEL 3 Performance (3) Design & evaluation: Information Theory (Block 2)

  51. 51 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially.

  52. 52 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially.

  53. 53 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially.

  54. 54 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. PHY (1) RX

  55. 55 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) PHY (1) RX

  56. 56 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) PHY (1) RX

  57. 57 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX

  58. 58 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX

  59. 59 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX CHANNEL 1 Performance (1)

  60. 60 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX CHANNEL 1 Performance (1)

  61. 61 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX CHANNEL 2 Performance (2) CHANNEL 1 Performance (1)

  62. 62 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX CHANNEL 2 Performance (2) CHANNEL 1 Performance (1)

  63. 63 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX CHANNEL 2 Performance (2) CHANNEL 1 Performance (1) CHANNEL 3 Performance (3)

  64. 64 Digital Communications: introduction • NOTE: conceptually separated operations. –

    Implementation may be done jointly instead of sequentially. Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX CHANNEL 2 Performance (2) CHANNEL 1 Performance (1) CHANNEL 3 Performance (3) Design & evaluation: Information Theory (Block 2)

  65. 65 Digital Communications: introduction • Additional operations at the PHY.

    Source Destination

  66. 66 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Source Destination

  67. 67 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Encryption Source Destination

  68. 68 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Encryption Source coding Source Destination

  69. 69 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Encryption Source coding Source Destination

  70. 70 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX Encryption Source coding Source Destination

  71. 71 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX Encryption Source coding Decryption Source Destination

  72. 72 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX Encryption Source coding Decryption Source decoding Source Destination

  73. 73 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX Encryption Source coding Decryption Source decoding Source Destination

  74. 74 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX Encryption Source coding Decryption Source decoding Source Destination Block 2

  75. 75 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX Encryption Source coding Decryption Source decoding Source Destination Block 2

  76. 76 Digital Communications: introduction • Additional operations at the PHY.

    Medium access Medium access (Block 4) (Block 4) Modulation Modulation (CT & Block 2) (CT & Block 2) Channel coding Channel coding (Block 3) (Block 3) PHY (1) TX Distortion Noise Limitations Medium access Medium access (Block 4) (Block 4) Demodulation Demodulation (CT & Block 2) (CT & Block 2) Channel Channel decoding decoding (Block 3) (Block 3) PHY (1) RX Encryption Source coding Decryption Source decoding Source Destination Block 2 Basic hypothesis: equiprobable binary sequence P(b=0)=P(b=1)=0.5

  77. 77 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization.

  78. 78 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization. iDude

  79. 79 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization. iDude SNR, Eb/N0

  80. 80 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization. iDude SNR, Eb/N0 Available power

  81. 81 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization. iDude SNR, Eb/N0 Available power Transmission rate

  82. 82 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization. iDude SNR, Eb/N0 Bandwidth Available power Transmission rate

  83. 83 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization. iDude SNR, Eb/N0 Bandwidth Available power Transmission rate Error probability

  84. 84 Digital Communications: introduction • Design and performance criteria/parameters. –

    Already known for those familiar with Comunication Theory. – They are evaluated for each level/layer, point to point. – Basic issue: limitations and tradeoffs → optimization. iDude SNR, Eb/N0 Bandwidth Available power Transmission rate Error probability Distortion Interference

  85. 85 Digital Communications: introduction

  86. 86 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX)

  87. 87 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX) R max ________ SNR ____ Allowed interference ____ Reliability ____ BW max ____ P max

  88. 88 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX) R max ________ SNR ____ Allowed interference ____ Reliability ____ BW max ____ P max R 1 SNR 1 BW 1 ...

  89. 89 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX) R max ________ SNR ____ Allowed interference ____ Reliability ____ BW max ____ P max R 2 SNR 2 BW 2 ... R 1 SNR 1 BW 1 ...

  90. 90 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX) R max ________ SNR ____ Allowed interference ____ Reliability ____ BW max ____ P max …...... R 2 SNR 2 BW 2 ... R 1 SNR 1 BW 1 ... R n SNR n BW n ...

  91. 91 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX) R max ________ SNR ____ Allowed interference ____ Reliability ____ BW max ____ P max …...... R 2 SNR 2 BW 2 ... R 1 SNR 1 BW 1 ... R n SNR n BW n ... …...... R' 2 SNR' 2 BW' 2 ... R' 1 SNR' 1 BW' 1 ... R' n SNR' n BW' n ...

  92. 92 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX) R max ________ SNR ____ Allowed interference ____ Reliability ____ BW max ____ P max …...... R 2 SNR 2 BW 2 ... R 1 SNR 1 BW 1 ... R n SNR n BW n ... …...... R' 2 SNR' 2 BW' 2 ... R' 1 SNR' 1 BW' 1 ... R' n SNR' n BW' n ... SHARE AND MANAGE LIMITED RESOURCES

  93. 93 MEDIUM Digital Communications: introduction Medium access Medium access (TX)

    (TX) Medium access Medium access (RX) (RX) R max ________ SNR ____ Allowed interference ____ Reliability ____ BW max ____ P max …...... R 2 SNR 2 BW 2 ... R 1 SNR 1 BW 1 ... R n SNR n BW n ... …...... R' 2 SNR' 2 BW' 2 ... R' 1 SNR' 1 BW' 1 ... R' n SNR' n BW' n ... SHARE AND MANAGE LIMITED RESOURCES Information Theory

  94. 94 Digital Communications: introduction

  95. 95 Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation Demodulation

    (RX) (RX)

  96. 96 CHANNEL Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation

    Demodulation (RX) (RX)

  97. 97 CHANNEL Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation

    Demodulation (RX) (RX) R mod ____ SNR ____ Es/N0 ____ P s (e) ____ BW mod ____ P mod

  98. 98 CHANNEL Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation

    Demodulation (RX) (RX) R mod ____ SNR ____ Es/N0 ____ P s (e) ____ BW mod ____ P mod

  99. 99 CHANNEL Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation

    Demodulation (RX) (RX) R mod ____ SNR ____ Es/N0 ____ P s (e) ____ BW mod ____ P mod

  100. 100 CHANNEL Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation

    Demodulation (RX) (RX) R mod ____ SNR ____ Es/N0 ____ P s (e) ____ BW mod ____ P mod P b (e) _____ Eb/N0 _____ R b

  101. 101 CHANNEL Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation

    Demodulation (RX) (RX) R mod ____ SNR ____ Es/N0 ____ P s (e) ____ BW mod ____ P mod P b (e) _____ Eb/N0 _____ R b ADAPT SIGNALS TO THE CHANNEL AND IMPROVE PERFORMANCE

  102. 102 CHANNEL Digital Communications: introduction Modulation Modulation (TX) (TX) Demodulation

    Demodulation (RX) (RX) R mod ____ SNR ____ Es/N0 ____ P s (e) ____ BW mod ____ P mod P b (e) _____ Eb/N0 _____ R b ADAPT SIGNALS TO THE CHANNEL AND IMPROVE PERFORMANCE Information Theory

  103. 103 Digital Communications: introduction

  104. 104 Digital Communications: introduction Channel coding Channel coding (TX) (TX)

    Channel Channel decoding decoding (RX) (RX)

  105. 105 CHANNEL Digital Communications: introduction Channel coding Channel coding (TX)

    (TX) Channel Channel decoding decoding (RX) (RX)

  106. 106 CHANNEL Digital Communications: introduction Channel coding Channel coding (TX)

    (TX) Channel Channel decoding decoding (RX) (RX) P b (e) ________ Eb/N0(out) ____ R b

  107. 107 CHANNEL Digital Communications: introduction Channel coding Channel coding (TX)

    (TX) Channel Channel decoding decoding (RX) (RX) P b (e) ________ Eb/N0(out) ____ R b

  108. 108 CHANNEL Digital Communications: introduction Channel coding Channel coding (TX)

    (TX) Channel Channel decoding decoding (RX) (RX) P b (e) ________ Eb/N0(out) ____ R b

  109. 109 CHANNEL Digital Communications: introduction Channel coding Channel coding (TX)

    (TX) Channel Channel decoding decoding (RX) (RX) P b (e) ________ Eb/N0(out) ____ R b P' b (e)<P b (e) _____ Eb/N0(in) _____ R' b <R b

  110. 110 CHANNEL Digital Communications: introduction Channel coding Channel coding (TX)

    (TX) Channel Channel decoding decoding (RX) (RX) P b (e) ________ Eb/N0(out) ____ R b P' b (e)<P b (e) _____ Eb/N0(in) _____ R' b <R b PROTECT INFORMATION INTEGRITY AT THE COST OF DATA RATE

  111. 111 CHANNEL Digital Communications: introduction Channel coding Channel coding (TX)

    (TX) Channel Channel decoding decoding (RX) (RX) P b (e) ________ Eb/N0(out) ____ R b P' b (e)<P b (e) _____ Eb/N0(in) _____ R' b <R b PROTECT INFORMATION INTEGRITY AT THE COST OF DATA RATE Information Theory

  112. 112 Digital Communications: introduction • Example: WiFi standard (access: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4248378)

  113. 113 Digital Communications: introduction • Example: WiFi standard (access: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4248378)

  114. 114 Digital Communications: introduction • Example: WiFi standard (access: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4248378)

  115. 115 Digital Communications: introduction • Example: WiFi standard (access: http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4248378)

  116. 116 Digital Communications: introduction • Medium access (channel identification).

  117. 117 Digital Communications: introduction • Medium access (channel identification).

  118. 118 Digital Communications: introduction • Medium access (channel identification).

  119. 119 Digital Communications: introduction • Medium access (channel identification). Signal

    generation

  120. 120 Digital Communications: introduction • Medium access + modulation.

  121. 121 Digital Communications: introduction • Medium access + modulation.

  122. 122 Digital Communications: introduction • Medium access + modulation.

  123. 123 Digital Communications: introduction • Medium access + modulation.

  124. 124 Digital Communications: introduction • Medium access + modulation.

  125. 125 Digital Communications: introduction • Medium access + modulation. Different

    modes for resource sharing

  126. 126 Digital Communications: introduction • Medium access + modulation. Different

    modes for resource sharing

  127. 127 Digital Communications: introduction • Modulation and channel coding.

  128. 128 Digital Communications: introduction • Modulation and channel coding.

  129. 129 Digital Communications: introduction • Modulation and channel coding.

  130. 130 Digital Communications: introduction • Modulation and channel coding. Modulator

  131. 131 Digital Communications: introduction • Modulation and channel coding. Modulator

  132. 132 Digital Communications: introduction • Modulation and channel coding. Modulator

    Channel encoder

  133. 133 Digital Communications: introduction • Modulation and channel coding. Modulator

    Channel encoder

  134. 134 Digital Communications: introduction • Channel encoder.

  135. 135 Digital Communications: introduction • Channel encoder.

  136. 136 Digital Communications: introduction • Channel encoder.

  137. 137 Digital Communications: introduction • Channel encoder.

  138. 138 Digital Communications: introduction • Channel encoder. Algebraic structure

  139. 139 Digital Communications: introduction • Channel encoder. Algebraic structure

  140. 140 Digital Communications: introduction • Channel encoder. Algebraic structure Implementation:

    finite-state machine

  141. 141 Digital Communications: introduction • It is important to discern

    – Abstract operations / layers (“divide and conquer”). – HW implementation. • Recall always – Basic scheme of Digital Communications. – Design and evaluation parameters. – Concepts from Communication Theory and Signals and Systems. • Main purpose: – Given some resources, and some target conditions and target performance, manage to evaluate and/or design the appropriate subsystems.