JPS57173242A - Synchronizing circuit - Google Patents

Synchronizing circuit

Info

Publication number
JPS57173242A
JPS57173242A JP56058939A JP5893981A JPS57173242A JP S57173242 A JPS57173242 A JP S57173242A JP 56058939 A JP56058939 A JP 56058939A JP 5893981 A JP5893981 A JP 5893981A JP S57173242 A JPS57173242 A JP S57173242A
Authority
JP
Japan
Prior art keywords
frequency
receiver
output
state
time
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
JP56058939A
Other languages
Japanese (ja)
Inventor
Tsuneo Danno
Eiichiro Murata
Masashi Sugano
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP56058939A priority Critical patent/JPS57173242A/en
Publication of JPS57173242A publication Critical patent/JPS57173242A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation

Landscapes

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

Abstract

PURPOSE:To greatly shorten a mean resynchronization time in case of a phase shift due to multipath by placing a frequency diffusion communication device in a state preceding by some number of bits before a phase search is performed. CONSTITUTION:In the figure that shows the principal constitution of a receiver, a clock variable circuit 11' supplies a signal having a frequency fc or a frequency a little bit higher than the fc to a PN generator 9 by the output of a synchronism discriminating circuit 12. Further, if the synchronizm discriminating circuit 12 generates an output phase shift and this state continues for a time T0 or longer, the signal applied to the PN code generation part 9 is stopped for some set time TB. While the receiver is in a synchronizing state, the output frequency of the clock variable circuit 11' is the Fc. Thus, the receiver is placed in a state preceding by some number of bits before it starts a phase search, and then the phase search is carried out.
JP56058939A 1981-04-17 1981-04-17 Synchronizing circuit Pending JPS57173242A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56058939A JPS57173242A (en) 1981-04-17 1981-04-17 Synchronizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56058939A JPS57173242A (en) 1981-04-17 1981-04-17 Synchronizing circuit

Publications (1)

Publication Number Publication Date
JPS57173242A true JPS57173242A (en) 1982-10-25

Family

ID=13098798

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56058939A Pending JPS57173242A (en) 1981-04-17 1981-04-17 Synchronizing circuit

Country Status (1)

Country Link
JP (1) JPS57173242A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02164150A (en) * 1988-12-19 1990-06-25 Icom Inc Spread spectrum communication equipment
JPH02164151A (en) * 1988-12-19 1990-06-25 Icom Inc Spread spectrum communication equipment
JPH047931A (en) * 1990-04-25 1992-01-13 Sanyo Electric Co Ltd Spread spectrum signal demodulation circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02164150A (en) * 1988-12-19 1990-06-25 Icom Inc Spread spectrum communication equipment
JPH02164151A (en) * 1988-12-19 1990-06-25 Icom Inc Spread spectrum communication equipment
JP2676241B2 (en) * 1988-12-19 1997-11-12 アイコム株式会社 Spread spectrum communication equipment
JPH047931A (en) * 1990-04-25 1992-01-13 Sanyo Electric Co Ltd Spread spectrum signal demodulation circuit

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