WO1997002676A3 - Transmitter control system for low data rate fsk modulation - Google Patents

Transmitter control system for low data rate fsk modulation Download PDF

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Publication number
WO1997002676A3
WO1997002676A3 PCT/IB1996/000610 IB9600610W WO9702676A3 WO 1997002676 A3 WO1997002676 A3 WO 1997002676A3 IB 9600610 W IB9600610 W IB 9600610W WO 9702676 A3 WO9702676 A3 WO 9702676A3
Authority
WO
WIPO (PCT)
Prior art keywords
data
control system
data rate
low data
transmitter control
Prior art date
Application number
PCT/IB1996/000610
Other languages
French (fr)
Other versions
WO1997002676A2 (en
Inventor
Srinagesh Satyanarayana
Aninda V Dasgupta
Original Assignee
Philips Electronics Nv
Philips Norden Ab
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 Philips Electronics Nv, Philips Norden Ab filed Critical Philips Electronics Nv
Publication of WO1997002676A2 publication Critical patent/WO1997002676A2/en
Publication of WO1997002676A3 publication Critical patent/WO1997002676A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks

Landscapes

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

Abstract

Packets of data are transmitted by an FSK modulated transmitter including a controlled oscillator and a phase locked loop for carrier frequency control, in which the loop compares the transmitted frequency with a reference source. A transmission starts with a burst of carrier signal free from data. Just prior to, or approximately at the start of, modulation with a data sequence the phase locked loop is opened. The control signal for the controlled oscillator is maintained approximately constant for the duration of the data sequence transmission, and the loop is closed again after completion of data transmission.
PCT/IB1996/000610 1995-06-30 1996-06-26 Transmitter control system for low data rate fsk modulation WO1997002676A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49828595A 1995-06-30 1995-06-30
US08/498,285 1995-11-16

Publications (2)

Publication Number Publication Date
WO1997002676A2 WO1997002676A2 (en) 1997-01-23
WO1997002676A3 true WO1997002676A3 (en) 1997-02-27

Family

ID=23980394

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1996/000610 WO1997002676A2 (en) 1995-06-30 1996-06-26 Transmitter control system for low data rate fsk modulation

Country Status (1)

Country Link
WO (1) WO1997002676A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1049312C (en) * 1997-08-12 2000-02-09 李道本 Spread spectrum address coding technique
GB2342009A (en) * 1998-09-24 2000-03-29 Nokia Mobile Phones Ltd Disabling a PLL to reduce power consumption in a receiver
CN1852377A (en) * 2005-04-22 2006-10-25 华为技术有限公司 Data transmission method between switchboard and terminal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500857A (en) * 1983-02-24 1985-02-19 The United States Of America As Represented By The Secretary Of The Army Frequency modulated phase locked loop
US4567603A (en) * 1983-06-09 1986-01-28 Motorola, Inc. FSK Modulator and method for NRZ data transmission utilizing PLL frequency synthesis
JPH01129514A (en) * 1987-11-13 1989-05-22 Alps Electric Co Ltd Fsk modulator
JPH07154432A (en) * 1993-11-30 1995-06-16 Nec Corp Fsk modulator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500857A (en) * 1983-02-24 1985-02-19 The United States Of America As Represented By The Secretary Of The Army Frequency modulated phase locked loop
US4567603A (en) * 1983-06-09 1986-01-28 Motorola, Inc. FSK Modulator and method for NRZ data transmission utilizing PLL frequency synthesis
JPH01129514A (en) * 1987-11-13 1989-05-22 Alps Electric Co Ltd Fsk modulator
JPH07154432A (en) * 1993-11-30 1995-06-16 Nec Corp Fsk modulator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 378 (E - 809) *

Also Published As

Publication number Publication date
WO1997002676A2 (en) 1997-01-23

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