JPS56102143A - Spectrum diffusion communication system - Google Patents

Spectrum diffusion communication system

Info

Publication number
JPS56102143A
JPS56102143A JP481480A JP481480A JPS56102143A JP S56102143 A JPS56102143 A JP S56102143A JP 481480 A JP481480 A JP 481480A JP 481480 A JP481480 A JP 481480A JP S56102143 A JPS56102143 A JP S56102143A
Authority
JP
Japan
Prior art keywords
pilot signal
synchronous detection
signals
converted
supplied
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
JP481480A
Other languages
Japanese (ja)
Inventor
Masashi Sugano
Eiichiro Murata
Tsuneo Danno
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 JP481480A priority Critical patent/JPS56102143A/en
Publication of JPS56102143A publication Critical patent/JPS56102143A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition

Landscapes

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

Abstract

PURPOSE:To make it possible to perform highly accurate reception synchronous detection, by reducing erroneous judgments due to noise, etc., by inserting a pilot signal to be used for detection synchronous detection at the transmission side. CONSTITUTION:The sound signal from LPF2 and the pilot signal from oscillator 3 are converted into base band signals after they are given to FM modulator 4, and then supplied to antenna 11 through frequency converter 9 after it is two-phase phase modulated and converted into spectrum diffusion signals in accordance with the diffusion code series from PN code generator by phase modulator 7. On the other hand, the receiving signal is FM detected 18 through frequency converter 4, correlator 15, and BPF16, and supplied to speaker 22, noise extracting HPF23, and pilot signal extracting BPF24. Outputs of filter 23 and 24 are rectified 25, 26, respectively, the level of each DC output is compared 27, and synchronous detection signals are outputted when the level difference exceeds a prescribed value, and thus a synchronous condition is maintained.
JP481480A 1980-01-19 1980-01-19 Spectrum diffusion communication system Pending JPS56102143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP481480A JPS56102143A (en) 1980-01-19 1980-01-19 Spectrum diffusion communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP481480A JPS56102143A (en) 1980-01-19 1980-01-19 Spectrum diffusion communication system

Publications (1)

Publication Number Publication Date
JPS56102143A true JPS56102143A (en) 1981-08-15

Family

ID=11594204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP481480A Pending JPS56102143A (en) 1980-01-19 1980-01-19 Spectrum diffusion communication system

Country Status (1)

Country Link
JP (1) JPS56102143A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58145263A (en) * 1981-12-18 1983-08-30 セネルコ・リミテド Transmitter/responder system
JPS6457846A (en) * 1987-08-27 1989-03-06 Gen Res Electronics Inc Pilot signal system in code hopping spread spectrum communication system
JPH02271731A (en) * 1989-04-12 1990-11-06 Nippon Avionics Co Ltd Synchronizing circuit for spread spectrum communication equipment
JPH03289831A (en) * 1990-04-06 1991-12-19 Sanyo Electric Co Ltd Spread spectrum communication system
US6480523B1 (en) 1998-03-04 2002-11-12 Nec Corporation Spectrum spreading communication system using single spreading code

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58145263A (en) * 1981-12-18 1983-08-30 セネルコ・リミテド Transmitter/responder system
JPS6457846A (en) * 1987-08-27 1989-03-06 Gen Res Electronics Inc Pilot signal system in code hopping spread spectrum communication system
JPH02271731A (en) * 1989-04-12 1990-11-06 Nippon Avionics Co Ltd Synchronizing circuit for spread spectrum communication equipment
JPH03289831A (en) * 1990-04-06 1991-12-19 Sanyo Electric Co Ltd Spread spectrum communication system
US6480523B1 (en) 1998-03-04 2002-11-12 Nec Corporation Spectrum spreading communication system using single spreading code
US6827483B2 (en) 1998-03-04 2004-12-07 Nec Corporation Spectrum spreading communication system using single spreading code

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