CA2145567A1 - Methods of and Devices for Enhancing Communications that Use Spread Spectrum Technology - Google Patents

Methods of and Devices for Enhancing Communications that Use Spread Spectrum Technology

Info

Publication number
CA2145567A1
CA2145567A1 CA2145567A CA2145567A CA2145567A1 CA 2145567 A1 CA2145567 A1 CA 2145567A1 CA 2145567 A CA2145567 A CA 2145567A CA 2145567 A CA2145567 A CA 2145567A CA 2145567 A1 CA2145567 A1 CA 2145567A1
Authority
CA
Canada
Prior art keywords
signal
error protection
spread spectrum
applying
spectrum technology
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
CA2145567A
Other languages
French (fr)
Other versions
CA2145567C (en
Inventor
Nambirajan Seshadri
Carl-Erik Wilhelm Sundberg
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.)
AT&T Corp
Original Assignee
AT&T Corp
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 AT&T Corp filed Critical AT&T Corp
Publication of CA2145567A1 publication Critical patent/CA2145567A1/en
Application granted granted Critical
Publication of CA2145567C publication Critical patent/CA2145567C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04L1/004—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
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/35—Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
    • 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
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • 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
    • H04L1/0041—Arrangements at the transmitter end
    • 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
    • H04L1/0045—Arrangements at the receiver end
    • 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
    • H04L1/007—Unequal error protection
    • 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
    • H04L2001/0098—Unequal error protection

Abstract

The present invention provides a method and an apparatus for enhancing communication that use spread spectrum technology. The method of processing a signal includes applying a spread spectrum encoding process to the signal where the improvement includes applying a first error protection process to a significant portion of the signal and a second error protection process to a less significant portion of the signal. The first error protection process provides a greater amount of error protection than the second error protection process. The actual step of applying the error protection processes can include, for example, applying a variable rate coder to the signal to generate an intermediate modulated signal and applying a variable time modulator to the intermediate modulated signal.
CA002145567A 1994-04-29 1995-03-27 Methods of and devices for enhancing communications that use spread spectrum technology Expired - Lifetime CA2145567C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US236,744 1994-04-29
US08/236,744 US5751739A (en) 1994-04-29 1994-04-29 Methods of and devices for enhancing communications that use spread spectrum technology

Publications (2)

Publication Number Publication Date
CA2145567A1 true CA2145567A1 (en) 1995-10-30
CA2145567C CA2145567C (en) 1999-12-28

Family

ID=22890770

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002145567A Expired - Lifetime CA2145567C (en) 1994-04-29 1995-03-27 Methods of and devices for enhancing communications that use spread spectrum technology

Country Status (4)

Country Link
US (1) US5751739A (en)
EP (1) EP0681376B1 (en)
CA (1) CA2145567C (en)
DE (1) DE69535415T2 (en)

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US5603081A (en) * 1993-11-01 1997-02-11 Telefonaktiebolaget Lm Ericsson Method for communicating in a wireless communication system
CA2145566C (en) * 1994-04-29 1999-12-28 Nambirajan Seshadri Methods of and devices for enhancing communications that use spread spectrum technology
US5883899A (en) * 1995-05-01 1999-03-16 Telefonaktiebolaget Lm Ericsson Code-rate increased compressed mode DS-CDMA systems and methods
GB2301739A (en) * 1995-06-02 1996-12-11 Dsc Communications Synchronizing a Transmitter in a Subscriber Terminal in a Wireless Communications System
US5742595A (en) * 1995-06-02 1998-04-21 Dsc Communications Corporation Processing CDMA signals
US7929498B2 (en) * 1995-06-30 2011-04-19 Interdigital Technology Corporation Adaptive forward power control and adaptive reverse power control for spread-spectrum communications
US7020111B2 (en) 1996-06-27 2006-03-28 Interdigital Technology Corporation System for using rapid acquisition spreading codes for spread-spectrum communications
ZA965340B (en) 1995-06-30 1997-01-27 Interdigital Tech Corp Code division multiple access (cdma) communication system
US6885652B1 (en) 1995-06-30 2005-04-26 Interdigital Technology Corporation Code division multiple access (CDMA) communication system
US6665308B1 (en) 1995-08-25 2003-12-16 Terayon Communication Systems, Inc. Apparatus and method for equalization in distributed digital data transmission systems
US5768269A (en) * 1995-08-25 1998-06-16 Terayon Corporation Apparatus and method for establishing frame synchronization in distributed digital data communication systems
US6356555B1 (en) 1995-08-25 2002-03-12 Terayon Communications Systems, Inc. Apparatus and method for digital data transmission using orthogonal codes
US5805583A (en) * 1995-08-25 1998-09-08 Terayon Communication Systems Process for communicating multiple channels of digital data in distributed systems using synchronous code division multiple access
US6307868B1 (en) 1995-08-25 2001-10-23 Terayon Communication Systems, Inc. Apparatus and method for SCDMA digital data transmission using orthogonal codes and a head end modem with no tracking loops
US6678311B2 (en) 1996-05-28 2004-01-13 Qualcomm Incorporated High data CDMA wireless communication system using variable sized channel codes
KR100387078B1 (en) * 1997-07-30 2003-10-22 삼성전자주식회사 Apparatus and method for puncturing and recovering symbol in band-spreading communication system
US6034997A (en) * 1997-08-19 2000-03-07 Stanford Telecommunications, Inc. Trellis decoding with multiple symbol noncoherent detection and interleaving to combat frequency offset
JP3917194B2 (en) * 1998-03-14 2007-05-23 サムスン エレクトロニクス カンパニー リミテッド Apparatus and method for transmitting and receiving frame messages of different lengths in a CDMA communication system
JP3429674B2 (en) * 1998-04-28 2003-07-22 沖電気工業株式会社 Multiplex communication system
EP0975118B1 (en) * 1998-07-24 2007-05-09 Matsushita Electric Industrial Co., Ltd. CDMA radio communication system and method
JP2000068862A (en) 1998-08-19 2000-03-03 Fujitsu Ltd Error correction coder
US6421395B1 (en) * 1999-02-09 2002-07-16 Lucent Technologies Inc. Termination of coded or uncoded modulation with path-oriented decoder
US6621872B1 (en) 1999-03-31 2003-09-16 Cisco Technology Inc. Systems and methods for improved medium access control messaging
US6577614B1 (en) 1999-05-27 2003-06-10 Qwest Communications International Inc. System and method for OTA over CDMA data channel
US6298242B1 (en) 1999-07-22 2001-10-02 Qualcomm Inc. Method and apparatus for reducing frame error rate through signal power adjustment
US7089477B1 (en) * 1999-08-18 2006-08-08 California Institute Of Technology Interleaved serial concatenation forming turbo-like codes
DE19947019A1 (en) 1999-09-30 2001-06-07 Infineon Technologies Ag Method and device for generating spread-coded signals
US7116710B1 (en) 2000-05-18 2006-10-03 California Institute Of Technology Serial concatenation of interleaved convolutional codes forming turbo-like codes
CN1218493C (en) 2000-07-17 2005-09-07 皇家菲利浦电子有限公司 Coding of data stream
US6631277B2 (en) * 2001-03-02 2003-10-07 Telefonaktiebolaget Lm Ericsson (Publ) Compensation for antenna diagram optimization
WO2003003601A1 (en) * 2001-06-29 2003-01-09 Nokia Corporation Method and apparatus for an optical cdma system
FI20011418A (en) * 2001-06-29 2002-12-30 Nokia Corp A method and apparatus for receiving a signal in an optical CDMA system
EP1706951A1 (en) 2003-12-30 2006-10-04 Sennheiser electronic GmbH & Co. KG Digital microphone

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FR2660131B1 (en) * 1990-03-23 1992-06-19 France Etat DEVICE FOR TRANSMITTING DIGITAL DATA WITH AT LEAST TWO LEVELS OF PROTECTION, AND CORRESPONDING RECEPTION DEVICE.
IL100213A (en) * 1990-12-07 1995-03-30 Qualcomm Inc CDMA microcellular telephone system and distributed antenna system therefor
US5214656A (en) * 1990-12-13 1993-05-25 At&T Bell Laboratories Multiplexed coded modulation with unequal error protection
US5204876A (en) * 1991-03-13 1993-04-20 Motorola, Inc. Method and apparatus for providing high data rate traffic channels in a spread spectrum communication system
SE469051B (en) * 1991-09-10 1993-05-03 Ericsson Telefon Ab L M METHOD OF DETECTING THE CHANNEL ACCESS TO A NUMBER OF CHANNELS IN A MOBILE RADIO SYSTEM
US5259003A (en) * 1991-11-08 1993-11-02 Teknekron Communications Systems, Inc. Method of encoding two digital data signals
TW224191B (en) * 1992-01-28 1994-05-21 Qualcomm Inc
MX9301888A (en) * 1992-04-10 1993-11-30 Ericsson Telefon Ab L M MULTIPLE ACCESS OF TIME DIVISION FOR ACCESS OF A MOBILE IN A MULTIPLE ACCESS SYSTEM OF DIVISION OF CODE.
US5287374A (en) * 1992-04-30 1994-02-15 Hughes Aircraft Company Identification of encoder type through observation of data received
DE69322322T2 (en) * 1992-07-08 1999-06-17 Koninkl Philips Electronics Nv Chained coding for OFDM transmission
US5396516A (en) * 1993-02-22 1995-03-07 Qualcomm Incorporated Method and system for the dynamic modification of control paremeters in a transmitter power control system
US5329547A (en) * 1993-03-11 1994-07-12 Motorola, Inc. Method and apparatus for coherent communication in a spread-spectrum communication system
US5463641A (en) * 1993-07-16 1995-10-31 At&T Ipm Corp. Tailored error protection
US5383219A (en) * 1993-11-22 1995-01-17 Qualcomm Incorporated Fast forward link power control in a code division multiple access system

Also Published As

Publication number Publication date
EP0681376B1 (en) 2007-03-07
CA2145567C (en) 1999-12-28
US5751739A (en) 1998-05-12
DE69535415T2 (en) 2007-11-29
EP0681376A3 (en) 1997-12-17
EP0681376A2 (en) 1995-11-08
DE69535415D1 (en) 2007-04-19

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Legal Events

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EEER Examination request
MKEX Expiry

Effective date: 20150327

MKEX Expiry

Effective date: 20150327