JPS5765936A - Synchronization holding system for spectrum diffusing communication - Google Patents

Synchronization holding system for spectrum diffusing communication

Info

Publication number
JPS5765936A
JPS5765936A JP55142054A JP14205480A JPS5765936A JP S5765936 A JPS5765936 A JP S5765936A JP 55142054 A JP55142054 A JP 55142054A JP 14205480 A JP14205480 A JP 14205480A JP S5765936 A JPS5765936 A JP S5765936A
Authority
JP
Japan
Prior art keywords
signal
synchronization
frequency
time corresponding
bit
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
JP55142054A
Other languages
Japanese (ja)
Other versions
JPS639701B2 (en
Inventor
Tomozo Oota
Ryoichi Ogawa
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP55142054A priority Critical patent/JPS5765936A/en
Publication of JPS5765936A publication Critical patent/JPS5765936A/en
Publication of JPS639701B2 publication Critical patent/JPS639701B2/ja
Granted 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
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/043—Pseudo-noise [PN] codes variable during transmission

Landscapes

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

Abstract

PURPOSE:To hold a stable synchronization without giving interference to a signal demodulation system by a passive synchronization holding system of the spectrum diffusing communication system, by changing the phase purposely to detect an error signal and by controlling the phase of the clock signal generator of the synchrozining system by this error signal. CONSTITUTION:DELTAr of a delay line is a delay time corresponding to one bit of a frequency hopping interval. That is, a local oscillation signal D of a receiving mixer 2 is delayed by a time corresponding to one bit, and the local oscillation signal of a mixer 14 for synchronization is delayed by a time corresponding to two bits. For an input signal C, if signal code sequences of transmission and receiving PN signal generators which determine a hopping frequency coincide with each other accurately, an output E is converted to a frequency fi correctly and is demodulated by a demodulator 3 which demodulates only the frequency fi. At this time, since a local oscillation signal shifted by a time corresponding to one bit for the input signal C is applied to mixers 14' and 14 for synchronization, outputs of mixers for synchronization do not become the frequency fi, and the IF signal is stopped by band pass filters 15' and 15, and detection outputs are not obtained from envelope detectors 16' and 16. Meanwhile, when the phase is shifted, detection outputs are generated and act upon PN signal generators.
JP55142054A 1980-10-13 1980-10-13 Synchronization holding system for spectrum diffusing communication Granted JPS5765936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55142054A JPS5765936A (en) 1980-10-13 1980-10-13 Synchronization holding system for spectrum diffusing communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55142054A JPS5765936A (en) 1980-10-13 1980-10-13 Synchronization holding system for spectrum diffusing communication

Publications (2)

Publication Number Publication Date
JPS5765936A true JPS5765936A (en) 1982-04-21
JPS639701B2 JPS639701B2 (en) 1988-03-01

Family

ID=15306333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55142054A Granted JPS5765936A (en) 1980-10-13 1980-10-13 Synchronization holding system for spectrum diffusing communication

Country Status (1)

Country Link
JP (1) JPS5765936A (en)

Also Published As

Publication number Publication date
JPS639701B2 (en) 1988-03-01

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