WO1998025369A3 - Method for correcting errors from jamming and fading signals in a frequency hopped spread spectrum communication system - Google Patents

Method for correcting errors from jamming and fading signals in a frequency hopped spread spectrum communication system Download PDF

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Publication number
WO1998025369A3
WO1998025369A3 PCT/US1997/021627 US9721627W WO9825369A3 WO 1998025369 A3 WO1998025369 A3 WO 1998025369A3 US 9721627 W US9721627 W US 9721627W WO 9825369 A3 WO9825369 A3 WO 9825369A3
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WO
WIPO (PCT)
Prior art keywords
signal
jamming
communication system
spread spectrum
error
Prior art date
Application number
PCT/US1997/021627
Other languages
French (fr)
Other versions
WO1998025369A2 (en
Inventor
Xiaojun Li
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of WO1998025369A2 publication Critical patent/WO1998025369A2/en
Publication of WO1998025369A3 publication Critical patent/WO1998025369A3/en

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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
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • 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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • 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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • 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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • 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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • H04B2001/71365—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform using continuous tuning of a single frequency source
    • 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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H04B2001/7152—Interference-related aspects with means for suppressing interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A communication system (10) has a selective call device (100) that transmits a frequency hopped spread spectrum signal encoded as a Reed Solomon code word and modulated as a four-level frequency shift keying (4FSK) signal. A transceiver (156) receives the signal on a plurality of narrow band channels in a pseudo random sequence. A DSP (152) performs a fast fourier transform on the signal. The DSP (152) has a comparator that computes and compares a 4FSK symbol to a jamming threshold and establishes a ratio of a maximum energy and a next to largest energy to an eye-opening threshold to indicate a probability of error. A determinator (334) determines when there is a jamming signal and in response to the probability of error determines when there is a fading signal in the narrow band channel. An erasure marker (346) marks a position as an erasure and an error encoding code (348) corrects errors marked as erasures.
PCT/US1997/021627 1996-12-04 1997-11-25 Method for correcting errors from jamming and fading signals in a frequency hopped spread spectrum communication system WO1998025369A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US76002296A 1996-12-04 1996-12-04
US08/760,022 1996-12-04

Publications (2)

Publication Number Publication Date
WO1998025369A2 WO1998025369A2 (en) 1998-06-11
WO1998025369A3 true WO1998025369A3 (en) 1998-10-15

Family

ID=25057814

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/021627 WO1998025369A2 (en) 1996-12-04 1997-11-25 Method for correcting errors from jamming and fading signals in a frequency hopped spread spectrum communication system

Country Status (1)

Country Link
WO (1) WO1998025369A2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4606041A (en) * 1984-10-19 1986-08-12 Itt Corporation Frequency hopping data communication system
US5023889A (en) * 1988-05-31 1991-06-11 California Institute Of Technology Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels
US5463657A (en) * 1994-02-15 1995-10-31 Lockheed Missiles & Space Company, Inc. Detection of a multi-sequence spread spectrum signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4606041A (en) * 1984-10-19 1986-08-12 Itt Corporation Frequency hopping data communication system
US5023889A (en) * 1988-05-31 1991-06-11 California Institute Of Technology Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels
US5463657A (en) * 1994-02-15 1995-10-31 Lockheed Missiles & Space Company, Inc. Detection of a multi-sequence spread spectrum signal

Also Published As

Publication number Publication date
WO1998025369A2 (en) 1998-06-11

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