JPS572145A - Radio transmission system - Google Patents

Radio transmission system

Info

Publication number
JPS572145A
JPS572145A JP7609880A JP7609880A JPS572145A JP S572145 A JPS572145 A JP S572145A JP 7609880 A JP7609880 A JP 7609880A JP 7609880 A JP7609880 A JP 7609880A JP S572145 A JPS572145 A JP S572145A
Authority
JP
Japan
Prior art keywords
frequency
receiver
fsk
flr
delivered
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
JP7609880A
Other languages
Japanese (ja)
Other versions
JPS601787B2 (en
Inventor
Takakuni Kuki
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 JP7609880A priority Critical patent/JPS601787B2/en
Publication of JPS572145A publication Critical patent/JPS572145A/en
Publication of JPS601787B2 publication Critical patent/JPS601787B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/04—Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To realize a frequency diversity with one receiver, by eliminating control for switching without providing any special switch circuit to a receiver of digital radio transmission system. CONSTITUTION:The 1st FSK signal is delivered from an FSK signal generating circuit 3 of a transmitter 1 at a base station and centering on the frequency fT1 corresponding to a digital signal of the modulated input. On the other hand, the frequency fLT higher than the bit transmission speed of twice as much as the intermediate frequency fIF of a receiver 2 at a mobile station is delivered from a local oscillator 5 and mixed with the frequency fT1 through a mixer 6. Thus the 2nd FSK signal centering on the frequency fT2 is delivered from a BPF7, and the 1st and 2nd FSK signals are transmitted from a hybrid 4. These FSK signals are received at a mixer 9 of the receiver 2 and mixed with the oscillation frequency fLR of a local oscillation 8. Then frequencies fT1+ or -fLR and fLR+ or -fT2 are applied to a BPF10, and the 1st and 2nd FSK signals are demodulated at and after an intermediate frequency amplifier 11.
JP7609880A 1980-06-06 1980-06-06 Wireless transmission method Expired JPS601787B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7609880A JPS601787B2 (en) 1980-06-06 1980-06-06 Wireless transmission method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7609880A JPS601787B2 (en) 1980-06-06 1980-06-06 Wireless transmission method

Publications (2)

Publication Number Publication Date
JPS572145A true JPS572145A (en) 1982-01-07
JPS601787B2 JPS601787B2 (en) 1985-01-17

Family

ID=13595377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7609880A Expired JPS601787B2 (en) 1980-06-06 1980-06-06 Wireless transmission method

Country Status (1)

Country Link
JP (1) JPS601787B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05102899A (en) * 1991-08-16 1993-04-23 Shiyoudenriyoku Kosoku Tsushin Kenkyusho:Kk Multi-frequency communication system
WO1998029828A1 (en) * 1996-12-27 1998-07-09 Rohm Co., Ltd. Responder, integrated circuit chip, noncontact ic card, and self power needless type device in noncontact ic card communication system, and automatic adjustment method for self power needless type device
WO2003007504A1 (en) * 2001-06-26 2003-01-23 Gcomm Corporation Radio transmitter-receiver
JP2005348386A (en) * 2004-06-04 2005-12-15 Gcomm Corp Transmitter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05102899A (en) * 1991-08-16 1993-04-23 Shiyoudenriyoku Kosoku Tsushin Kenkyusho:Kk Multi-frequency communication system
WO1998029828A1 (en) * 1996-12-27 1998-07-09 Rohm Co., Ltd. Responder, integrated circuit chip, noncontact ic card, and self power needless type device in noncontact ic card communication system, and automatic adjustment method for self power needless type device
AU748393B2 (en) * 1996-12-27 2002-06-06 Rohm Co., Ltd. Responder, integrated circuit chip, noncontact IC card, and self power needless type device in noncontact IC card communication system, and automatic ad justment method for self power needless type device
US6624743B1 (en) 1996-12-27 2003-09-23 Rohm Co., Ltd Automatic adjusting responder with no self-contained power supply
WO2003007504A1 (en) * 2001-06-26 2003-01-23 Gcomm Corporation Radio transmitter-receiver
JP2005348386A (en) * 2004-06-04 2005-12-15 Gcomm Corp Transmitter
JP4560713B2 (en) * 2004-06-04 2010-10-13 ジーコム株式会社 Transmitter

Also Published As

Publication number Publication date
JPS601787B2 (en) 1985-01-17

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