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Interference detection apparatus for use in digital mobile communications system

Info

Publication number
CA2012120A1
CA2012120A1 CA 2012120 CA2012120A CA2012120A1 CA 2012120 A1 CA2012120 A1 CA 2012120A1 CA 2012120 CA2012120 CA 2012120 CA 2012120 A CA2012120 A CA 2012120A CA 2012120 A1 CA2012120 A1 CA 2012120A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
path
minimum
metrics
metric
apparatus
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
CA 2012120
Other languages
French (fr)
Other versions
CA2012120C (en )
Inventor
Seiji Kondou
Hiroyasu Muto
Yoshihisa Isoda
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
Seiji Kondou
Hiroyasu Muto
Yoshihisa Isoda
Nec Corporation
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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0047Decoding adapted to other signal detection operation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045Arrangements at the receiver end
    • H04L1/0054Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/20Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/206Arrangements for detecting or preventing errors in the information received using signal quality detector for modulated signals

Abstract

An apparatus comprising a Viterbi decoder which decodes received convolutional code data in accordance with the Viterbi algorithm and provides path metrics.
Among the path metrics, a path metric comparator detects the maximum and minimum path metrics for each data symbol. The path metric comparator selects the minimum difference among differences between the maximum and minimum path metrics. An apparatus also comprises a field strength detector which detects the electromagnetic field strength of a radio signal containing the convolutional code data. Upon the minimum path metric difference and the field strength, an interference detector checks if interference exists in the radio signal. The minimum path metric difference may be used for an antenna diversity system.
CA 2012120 1989-03-15 1990-03-14 Interference detection apparatus for use in digital mobile communications system Expired - Lifetime CA2012120C (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP62857/1989 1989-03-15
JP6285789A JPH02241249A (en) 1989-03-15 1989-03-15 Interference detecting system
JP100616/1989 1989-04-20
JP10061689A JP2765037B2 (en) 1989-04-20 1989-04-20 Antenna diversity receiver

Publications (2)

Publication Number Publication Date
CA2012120A1 true true CA2012120A1 (en) 1990-09-15
CA2012120C CA2012120C (en) 1994-10-18

Family

ID=26403914

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2012120 Expired - Lifetime CA2012120C (en) 1989-03-15 1990-03-14 Interference detection apparatus for use in digital mobile communications system

Country Status (4)

Country Link
US (1) US5157672A (en)
CA (1) CA2012120C (en)
DE (2) DE69024386D1 (en)
EP (1) EP0388163B1 (en)

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CA2076296C (en) * 1991-09-10 2001-03-20 Jan Fredrik Farjh Method of detecting the channel identity of a number of channels in a mobile radio system
CA2109576C (en) * 1992-04-24 1998-06-16 Patrick J. Marry Method and apparatus for determining signal transmission quality levels of a transmitted signal
DE69331567T2 (en) * 1992-05-25 2002-10-10 Alcatel Sa A method for minimizing the IF estimated Bitfehlerratefunktion in a digital space / angle diversity radio receiver
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US5912907A (en) * 1993-11-22 1999-06-15 Thomson Consumer Electronics, Inc. Satellite receiver code rate switching apparatus
WO1995015033A1 (en) * 1993-11-22 1995-06-01 Thomson Consumer Electronics, Inc. Satellite receiver code rate switching apparatus
US5383219A (en) * 1993-11-22 1995-01-17 Qualcomm Incorporated Fast forward link power control in a code division multiple access system
FI98027C (en) * 1995-01-10 1997-03-25 Nokia Telecommunications Oy A packet radio system and terminal equipment for a packet radio system
FI950843A (en) * 1995-02-23 1996-08-24 Nokia Telecommunications Oy Method for determining the quality of the connection, and receiver
DE69633005T2 (en) * 1995-03-31 2005-07-21 Qualcomm, Inc., San Diego Power control method and-apparatus for a mobile kommunikatiossystem
US6137840A (en) * 1995-03-31 2000-10-24 Qualcomm Incorporated Method and apparatus for performing fast power control in a mobile communication system
US6977967B1 (en) 1995-03-31 2005-12-20 Qualcomm Incorporated Method and apparatus for performing fast power control in a mobile communication system
DE69601343T2 (en) * 1995-10-25 1999-07-15 Nec Corp Maximum likelihood decoding with soft decisions
US5737365A (en) * 1995-10-26 1998-04-07 Motorola, Inc. Method and apparatus for determining a received signal quality estimate of a trellis code modulated signal
FI100566B (en) * 1996-01-24 1997-12-31 Nokia Telecommunications Oy Frame quality and the identification of the receiver
US5949796A (en) * 1996-06-19 1999-09-07 Kumar; Derek D. In-band on-channel digital broadcasting method and system
US5893035A (en) * 1996-09-16 1999-04-06 Qualcomm Incorporated Centralized forward link power control
US5892774A (en) * 1996-12-12 1999-04-06 Qualcomm Incorporated Phase shift encoded subchannel
US5991284A (en) * 1997-02-13 1999-11-23 Qualcomm Inc. Subchannel control loop
US6243568B1 (en) * 1997-03-22 2001-06-05 Sharp Laboratories Of America, Inc. System and method for intuitively indicating signal quality in a wireless digital communications network
KR100243213B1 (en) * 1997-06-14 2000-02-01 윤종용 Apparatus for estimating the quatity of viterbi decoding data using zero state metrics(ZSM)
US6097972A (en) * 1997-08-29 2000-08-01 Qualcomm Incorporated Method and apparatus for processing power control signals in CDMA mobile telephone system
US6141388A (en) * 1998-03-11 2000-10-31 Ericsson Inc. Received signal quality determination method and systems for convolutionally encoded communication channels
US6308054B2 (en) * 1999-03-02 2001-10-23 Hitachi, Ltd. Diversity wireless communication method and its wireless communication apparatus
JP2001184149A (en) * 1999-12-27 2001-07-06 Toshiba Corp Information processor and method for controlling operation state
US8199696B2 (en) 2001-03-29 2012-06-12 Qualcomm Incorporated Method and apparatus for power control in a wireless communication system
US6771442B2 (en) 2001-06-29 2004-08-03 Infineon Technologies Ag Off-track interference emulator
US7162675B2 (en) * 2002-04-05 2007-01-09 Lucent Technologies Inc. Error detection methods in wireless communication systems
US7577249B2 (en) * 2003-01-06 2009-08-18 Gn Netcom, Inc. Wireless remote controlled handset lifter system using magnetically coupled ring detection
US7903764B2 (en) * 2004-05-10 2011-03-08 Broadcom Corporation Integrated burst FSK receiver
JP2005348338A (en) * 2004-06-07 2005-12-15 Alps Electric Co Ltd Radio interference deciding method and terminal device
US9209937B2 (en) * 2007-06-28 2015-12-08 Telefonaktiebolaget L M Ericsson (Publ) Reliable decoding of a high-speed shared control channel
US8429475B2 (en) * 2009-02-27 2013-04-23 Research In Motion Limited State dependent advanced receiver processing in a wireless mobile device

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US4214213A (en) * 1977-10-25 1980-07-22 Rca Corporation Signal selecting system
WO1984000653A1 (en) * 1982-08-03 1984-02-16 Motorola Inc Method and apparatus for measuring the strength of a radio frequency signal
JPS59181732A (en) * 1983-03-31 1984-10-16 Toshiba Corp Diversity receiving system in portable radio equipment
US4823398A (en) * 1985-12-23 1989-04-18 Kazuya Hashimoto Diversity receiver
US4704734A (en) * 1986-02-18 1987-11-03 Motorola, Inc. Method and apparatus for signal strength measurement and antenna selection in cellular radiotelephone systems
GB8609711D0 (en) * 1986-04-21 1986-05-29 Clark A P Channel estimation & detection
JPH0450778B2 (en) * 1986-07-26 1992-08-17 Nippon Electric Co
US4945549A (en) * 1986-11-13 1990-07-31 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Trellis coded modulation for transmission over fading mobile satellite channel
US4932029A (en) * 1987-07-24 1990-06-05 Ant Nachrichtentechnik Gmbh Method and apparatus for correcting errors in convolutional code signals
US4922507A (en) * 1987-12-01 1990-05-01 California Institute Of Technology Multiple trellis coded modulation
US4884272A (en) * 1988-02-10 1989-11-28 Mcconnell Peter R H Maximum likelihood diversity receiver
JP2708777B2 (en) * 1988-05-19 1998-02-04 三洋電機株式会社 Diversity receiver
JP2693488B2 (en) * 1988-06-09 1997-12-24 株式会社東芝 Diversity reception system
US4941154A (en) * 1989-05-30 1990-07-10 At&T Bell Laboratories Trellis coding method and arrangement for fractional bit rates

Also Published As

Publication number Publication date Type
EP0388163A2 (en) 1990-09-19 application
EP0388163A3 (en) 1992-06-10 application
CA2012120C (en) 1994-10-18 grant
EP0388163B1 (en) 1995-12-27 grant
DE69024386D1 (en) 1996-02-08 grant
DE69024386T2 (en) 1996-05-30 grant
US5157672A (en) 1992-10-20 grant

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