• DocumentCode
    756155
  • Title

    Design and Performances of a 200 Mbit/s 16 QAM Digital Radio System

  • Author

    Horikawa, Izumi ; Murase, Takehiro ; Saito, Yoichi

  • Author_Institution
    Nippon Telegraph and Telephone Public Corp., Japan
  • Volume
    27
  • Issue
    12
  • fYear
    1979
  • fDate
    12/1/1979 12:00:00 AM
  • Firstpage
    1953
  • Lastpage
    1958
  • Abstract
    A novel long haul 5 GHz 16 QAM digital radio system, which has 200 Mbit/s transmission capacity within the 40 MHz interleaved channel allocation, is proposed and described. It is designed to be overbuilt on existing FDM-FM routes with an approximately 50 km repeater spacing. To achieve the 5 bit/s/Hz RF spectral efficiency, the 16 QAM modulation and Nyquist cosine roll-off spectral shaping techniques ( \\alpha = 0.5 ) are investigated. Then a new signal shaping filter, differential encoding and carrier recovery techniques are presented. Finally, the effects of TWT amplifier nonlinearity on a 16 QAM signal are experimentally investigated.
  • Keywords
    APK communication; Microwave radio communication; Channel allocation; Communication networks; Digital communication; Microwave filters; Modems; Phase shift keying; Quadrature amplitude modulation; Radio frequency; Radiofrequency amplifiers; Repeaters;
  • fLanguage
    English
  • Journal_Title
    Communications, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0090-6778
  • Type

    jour

  • DOI
    10.1109/TCOM.1979.1094362
  • Filename
    1094362
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=756155