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JPS55115739A - Reception unit - Google Patents

Reception unit

Info

Publication number
JPS55115739A
JPS55115739A JP2305879A JP2305879A JPS55115739A JP S55115739 A JPS55115739 A JP S55115739A JP 2305879 A JP2305879 A JP 2305879A JP 2305879 A JP2305879 A JP 2305879A JP S55115739 A JPS55115739 A JP S55115739A
Authority
JP
Japan
Prior art keywords
antenna
selection
level
comparator
switches
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
JP2305879A
Other languages
Japanese (ja)
Inventor
Hiroshige Fukuhara
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP2305879A priority Critical patent/JPS55115739A/en
Publication of JPS55115739A publication Critical patent/JPS55115739A/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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To enable the selection to optimum antenna, by monitoring the signal level of antenna in use out of two antennas. CONSTITUTION:When the switches 15a, 25 are ON, switches 15b, 26 are OFF and the signal level of the antenna 12 decreases to the threshold, then the level detector 24 produces an output and the search pulse generator 27 gives pulses to the signal generator 15c and comparator 29. Thus, the antenna is selected to the antenna 13 for a given time, the comparator 29 compares the level immediately before the selection and that after the selection to feed pulses to select the antenna having greater level to the pulse signal generator 15c. Thus, reception is made by the selection to the best antenna.
JP2305879A 1979-02-28 1979-02-28 Reception unit Pending JPS55115739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2305879A JPS55115739A (en) 1979-02-28 1979-02-28 Reception unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2305879A JPS55115739A (en) 1979-02-28 1979-02-28 Reception unit

Publications (1)

Publication Number Publication Date
JPS55115739A true JPS55115739A (en) 1980-09-05

Family

ID=12099826

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2305879A Pending JPS55115739A (en) 1979-02-28 1979-02-28 Reception unit

Country Status (1)

Country Link
JP (1) JPS55115739A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495653A (en) * 1982-04-30 1985-01-22 Clarion Co., Ltd. Diversity receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4495653A (en) * 1982-04-30 1985-01-22 Clarion Co., Ltd. Diversity receiver

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