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JPS5541027A - Communication unit of radio channel selection type - Google Patents

Communication unit of radio channel selection type

Info

Publication number
JPS5541027A
JPS5541027A JP11393478A JP11393478A JPS5541027A JP S5541027 A JPS5541027 A JP S5541027A JP 11393478 A JP11393478 A JP 11393478A JP 11393478 A JP11393478 A JP 11393478A JP S5541027 A JPS5541027 A JP S5541027A
Authority
JP
Japan
Prior art keywords
signal
oscillator
audio band
communication
frequency
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.)
Pending
Application number
JP11393478A
Other languages
Japanese (ja)
Inventor
Yukio Ikoma
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11393478A priority Critical patent/JPS5541027A/en
Publication of JPS5541027A publication Critical patent/JPS5541027A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity

Landscapes

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

Abstract

PURPOSE:To obtain stable communication by selecting channel when interference of noise is subjected, by providing the means such as noise detection other than audio band, signal delivery and reception outside the audio band, and selection of radio channel, at the mobile radio unit. CONSTITUTION:The output of the radio frequency oscillator 5 is fed to the transmitter 1 and the receiver 2, the frequency is controlled at the control unit 9, to oscillate one of a plurality of frequencies. The signal oscillator 8 outside the audio band always makes transmission during communication, and the output of the signal detection circuit outside audio band 6 and the noise detection circuit 7 is inputted to the control unit 9. During the communication in a radio channel CHfk, if the quality of communication is deteriorated and the circuit 7 detects the presence of noise, the output is inputted to the control unit 9, which changes the frequency of the oscillator 5 and selects the channel to CHfi. The opposing station delivers the detection signal of absence outside audio band to the controller 9 and the frequency of the oscillator 5 is sequentially selected. When the circuit 6 detects the presence of signal at CHfi, the selection signal to the oscillator 5 is stopped to perform communication.
JP11393478A 1978-09-14 1978-09-14 Communication unit of radio channel selection type Pending JPS5541027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11393478A JPS5541027A (en) 1978-09-14 1978-09-14 Communication unit of radio channel selection type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11393478A JPS5541027A (en) 1978-09-14 1978-09-14 Communication unit of radio channel selection type

Publications (1)

Publication Number Publication Date
JPS5541027A true JPS5541027A (en) 1980-03-22

Family

ID=14624850

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11393478A Pending JPS5541027A (en) 1978-09-14 1978-09-14 Communication unit of radio channel selection type

Country Status (1)

Country Link
JP (1) JPS5541027A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195330A (en) * 1982-05-10 1983-11-14 Nippon Telegr & Teleph Corp <Ntt> Radio telephone system
JPS5919448A (en) * 1982-07-23 1984-01-31 Omron Tateisi Electronics Co Optimized transmitting and receiving method of mobile station and fixed station
KR100621953B1 (en) * 2001-08-28 2006-09-07 가부시키가이샤 엔.티.티.도코모 Communication channel setting method, communication controller, and radio communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58195330A (en) * 1982-05-10 1983-11-14 Nippon Telegr & Teleph Corp <Ntt> Radio telephone system
JPS5919448A (en) * 1982-07-23 1984-01-31 Omron Tateisi Electronics Co Optimized transmitting and receiving method of mobile station and fixed station
KR100621953B1 (en) * 2001-08-28 2006-09-07 가부시키가이샤 엔.티.티.도코모 Communication channel setting method, communication controller, and radio communication system

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