Thanks Thanks:  4
Showing results 1 to 1 of 1

Thread: Digital Microwave Communication Principles

  1. #1
    Member Reputation: 730
    Join Date
    2011-04-12
    Posts
    633


    Default Digital Microwave Communication Principles

    Digital Microwave Communication Principles

    Contents
    1 Microwave Communication Overview.................................................................................... 7
    1.1 Basic Concepts of Digital Microwave .......................................................................... 7
    1.2 Microwave Development Course................................................................................. 8
    1.2.1 Microwave Evolution in the World........................................................................ 8
    1.2.2 Microwave Evolution in China.............................................................................. 9
    1.3 Characteristics of Digital Radio Communication System .......................................... 10
    1.4 Challenges and Opportunities for Digital Microwave Communication ...................... 11
    1.4.1 Optical Fiber Communication—Biggest Challenge for Digital Microwave Communication ................................................................................................................. 11

    1.4.2 Opportunities for Digital Microwave Communication ......................................... 12
    1.5 Microwave Frequency Band Choice and RF Channel Arrangements....................... 14
    1.6 Digital Microwave Communication System Model .................................................... 16
    1.6.1 Modulation Method of Digital Microwave ........................................................... 16
    1.6.2 Channel Utilization of Each Modulation ............................................................. 18
    1.7 Digital Microwave Frame Structure ........................................................................... 19
    1.8 Conclusion ................................................................................................................. 21
    2 Introduction to Digital Microwave Equipment ..................................................................... 21
    2.1 Digital Microwave Equipment Classification .............................................................. 21
    2.2 Microwave antenna and feeder ................................................................................. 23
    2.2.1 Microwave antenna............................................................................................ 23
    2.2.2 Classification of Microwave Antennas ............................................................... 25
    2.2.3 Feeder System................................................................................................... 26
    2.2.4 Branching System.............................................................................................. 27
    2.3 Outdoor unit (ODU).................................................................................................... 27
    2.3.1 Constituents of Digital Microwave Transmitter and Major Performance Indexes28
    2.3.2 Constituents and Major Indexes of Receiver ..................................................... 30
    2.4 Indoor Unit ................................................................................................................. 33
    2.5 Installation and Adjustment of Split Microwave System............................................ 33
    2.6 Conclusion ................................................................................................................. 36
    3 Microwave System Networking and Application................................................................. 36
    3.1 Microwave System Typical Networking Modes and Station Types........................... 36
    3.1.1 Typical Networking Modes................................................................................. 36
    3.1.2 Microwave Station Types................................................................................... 37
    3.2 Relay Station ............................................................................................................. 38
    3.2.1 Passive Relay Station ........................................................................................ 38
    3.2.2 Active Relay Station ........................................................................................... 42
    3.3 Digital Microwave Application.................................................................................... 44
    3.4 Conclusion ................................................................................................................. 45
    4 Microwave Propagation Theory ............................................................................................ 45
    4.1 Electric Wave Propagation in Free Space................................................................. 45
    4.1.1 Free Space......................................................................................................... 45
    4.1.2 Propagation Loss of Electric Waves in Free Space........................................... 46
    4.2 Influence of Ground Reflection on the Electric Wave Propagation ........................... 46
    4.2.1 Concept of Fresnel Zone ................................................................................... 47
    4.2.2 Influence of Ground Reflection on Receiving Level........................................... 48
    4.3 Influence of Troposphere on Electric Wave .............................................................. 54
    4.3.1 Ray Bend in Atmosphere ................................................................................... 55
    4.3.2 Concept of Equivalent Earth Radius.................................................................. 56
    4.3.3 Refraction can be classified into three categories based on the K value .......... 56
    4.3.4 The Meaning of K Value in Engineering Design ................................................ 57
    4.4 Fading caused by Several Atmospheric and Earth Effects ....................................... 58
    4.4.1 Fading Types ..................................................................................................... 58
    4.4.2 Influence of Troposphere on Electric Wave Propagation .................................. 59
    4.4.3 Fading Rules (microwave frequency bands lower than 10 GHz) ...................... 61
    4.5 Frequency Selective Fading...................................................................................... 62
    4.5.1 Multi-path Propagation of Electric Waves.......................................................... 62
    4.5.2 Influence of Frequency Selective Fading on Transmission Quality of Microwave Communication Systems .................................................................................................. 63

    4.6 Statistic Feature of Fading......................................................................................... 64
    4.6.1 Microwave Fading Model—Rayleigh Distribution Function ............................... 64
    4.6.2 Engineering Calculation of Rayleigh Fading Probability .................................... 65
    4.7 Conclusion ................................................................................................................. 66
    5 Anti-Fading Technology in Digital Microwave Equipment ................................................. 67
    5.1 Overview.................................................................................................................... 67
    5.1.1 Purposes of Taking Anti-Fading Measures........................................................ 67
    5.1.2 Classification of Anti-Fading Measures ............................................................. 68
    5.1.3 Evaluation on Anti-Fading Measures................................................................. 69
    5.2 Adaptive Equalization ................................................................................................ 70
    5.2.1 AFE .................................................................................................................... 70
    5.2.2 ATE .................................................................................................................... 72
    5.3 Cross-Polarization Interference Counteracter (XPIC) ............................................... 73
    5.4 Automatic Transmit Power Control (ATPC)............................................................... 74
    5.5 Diversity Reception.................................................................................................... 76
    5.5.1 Classification of Diversity Reception.................................................................. 76
    5.5.2 Description of Space Diversity ........................................................................... 78
    5.5.3 Compound Mode of Diversity Signals................................................................ 80
    5.6 Microwave Equipment Protection Mode.................................................................... 81
    5.6.1 HSM ................................................................................................................... 81
    5.6.2 HSB.................................................................................................................... 82
    5.6.3 Classification of Digital Microwave Equipment Protection Modes ..................... 83
    5.7 Interference and Main Methods against Interference................................................ 84
    5.7.1 Interference Source ........................................................................................... 84
    5.7.2 Basic Methods of Communication System against Interference ....................... 85
    5.8 Conclusion ................................................................................................................. 86

  2. # ADS
    Circuit advertisement
    Join Date
    Always
    Posts
    Many
     

Tags for this Thread

Bookmarks

Bookmarks

Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •