JPS57164634A - Time division multidirectional communication system - Google Patents

Time division multidirectional communication system

Info

Publication number
JPS57164634A
JPS57164634A JP4839081A JP4839081A JPS57164634A JP S57164634 A JPS57164634 A JP S57164634A JP 4839081 A JP4839081 A JP 4839081A JP 4839081 A JP4839081 A JP 4839081A JP S57164634 A JPS57164634 A JP S57164634A
Authority
JP
Japan
Prior art keywords
signal
station
frequency
slave station
slave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4839081A
Other languages
Japanese (ja)
Other versions
JPS6258578B2 (en
Inventor
Susumu Sasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP4839081A priority Critical patent/JPS57164634A/en
Publication of JPS57164634A publication Critical patent/JPS57164634A/en
Publication of JPS6258578B2 publication Critical patent/JPS6258578B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/212—Time-division multiple access [TDMA]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To reduce data errors, by detecting a frequency form a non-modulation signal from each slave station in the master station side and controlling the transmission frequency of the slave station. CONSTITUTION:Slave stations 2-1-2-n are provided for a master station 1. For example, the slave station 2-2 transmits a station identification signal SC and data DA in the second slot of an assigned time band. However, in case of the transmission of a non-modulation signal, this signal is transmitted in a partial time band in the center of the second slot. This non-modulation signal has the frequency detected in the receiving part of the master station and is sampled and held, and the difference signal is turned back to the slave station. This signal is stored in a memory 13 in the slave station, and its value is subjected to D/A conversion in a circuit 14, and an obtained analogue voltage is applied to a frequency discriminator 12. As the result, the oscillation frequency of an oscillator incorporated in a modulator 11 is controlled.
JP4839081A 1981-04-02 1981-04-02 Time division multidirectional communication system Granted JPS57164634A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4839081A JPS57164634A (en) 1981-04-02 1981-04-02 Time division multidirectional communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4839081A JPS57164634A (en) 1981-04-02 1981-04-02 Time division multidirectional communication system

Publications (2)

Publication Number Publication Date
JPS57164634A true JPS57164634A (en) 1982-10-09
JPS6258578B2 JPS6258578B2 (en) 1987-12-07

Family

ID=12801959

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4839081A Granted JPS57164634A (en) 1981-04-02 1981-04-02 Time division multidirectional communication system

Country Status (1)

Country Link
JP (1) JPS57164634A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5977338A (en) * 1982-10-26 1984-05-02 Kanai Hiroyuki Quick abrasion testing device for metal card clothing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5977338A (en) * 1982-10-26 1984-05-02 Kanai Hiroyuki Quick abrasion testing device for metal card clothing

Also Published As

Publication number Publication date
JPS6258578B2 (en) 1987-12-07

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