CA2110995A1 - Multiple access coding for radio communications - Google Patents

Multiple access coding for radio communications

Info

Publication number
CA2110995A1
CA2110995A1 CA002110995A CA2110995A CA2110995A1 CA 2110995 A1 CA2110995 A1 CA 2110995A1 CA 002110995 A CA002110995 A CA 002110995A CA 2110995 A CA2110995 A CA 2110995A CA 2110995 A1 CA2110995 A1 CA 2110995A1
Authority
CA
Canada
Prior art keywords
masks
scrambling
individual
modulo
information signals
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
CA002110995A
Other languages
French (fr)
Other versions
CA2110995C (en
Inventor
Paul W. Dent
Gregory E. Bottomley
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.)
Ericsson Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2110995A1 publication Critical patent/CA2110995A1/en
Application granted granted Critical
Publication of CA2110995C publication Critical patent/CA2110995C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
    • 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
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H04J13/0048—Walsh
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/10—Secret communication by using two signals transmitted simultaneously or successively
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/04—Masking or blinding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/34—Encoding or coding, e.g. Huffman coding or error correction

Abstract

Individual information signals encoded with a common block error-correction code are assigned a unique scrambling mask, or signature sequence, taken from a set of scrambling masks having selected correlation properties. The set of scrambling masks is selected such that the correlation between the modulo-2 sum of two masks with any codeword in the block code is a constant magnitude, independent of the mask set and the individual masks being compared. In one embodiment, when any two masks are summed using modulo-2 arithmetic, the Walsh transformation of that sum results in a maximally flat Walsh spectrum. For cellular radio telephone systems using subtractive CDMA demodulation techniques, a two-tier ciphering system ensures security at the cellular system level by using a pseudorandomly generated code key to select one of the scrambling masks common to all of the mobile stations in a particular cell. Also, privacy at the individual mobile subscriber level is ensured by using a pseudorandomly generated ciphering key to encipher individual information signals before the scrambling operation.
CA002110995A 1992-04-10 1993-04-08 Multiple access coding for radio communications Expired - Fee Related CA2110995C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US866,865 1992-04-10
US07/866,865 US5353352A (en) 1992-04-10 1992-04-10 Multiple access coding for radio communications
PCT/US1993/003305 WO1993021709A1 (en) 1992-04-10 1993-04-08 Multiple access coding for radio communications

Publications (2)

Publication Number Publication Date
CA2110995A1 true CA2110995A1 (en) 1993-10-28
CA2110995C CA2110995C (en) 2002-11-12

Family

ID=25348598

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002110995A Expired - Fee Related CA2110995C (en) 1992-04-10 1993-04-08 Multiple access coding for radio communications

Country Status (15)

Country Link
US (1) US5353352A (en)
EP (1) EP0565506B1 (en)
JP (1) JP3436366B2 (en)
KR (1) KR100296563B1 (en)
AU (1) AU665254B2 (en)
BR (1) BR9305479A (en)
CA (1) CA2110995C (en)
DE (1) DE69330445T2 (en)
ES (1) ES2162810T3 (en)
FI (1) FI935526A (en)
HK (1) HK1014321A1 (en)
MX (1) MX9301960A (en)
NZ (1) NZ251900A (en)
SG (1) SG43043A1 (en)
WO (1) WO1993021709A1 (en)

Families Citing this family (118)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5550809A (en) * 1992-04-10 1996-08-27 Ericsson Ge Mobile Communications, Inc. Multiple access coding using bent sequences for mobile radio communications
US5295153A (en) 1992-04-13 1994-03-15 Telefonaktiebolaget L M Ericsson CDMA frequency allocation
EP0566551B1 (en) * 1992-04-17 1999-08-04 Telefonaktiebolaget L M Ericsson Mobile assisted handover using CDMA
US5717824A (en) * 1992-08-07 1998-02-10 Pacific Communication Sciences, Inc. Adaptive speech coder having code excited linear predictor with multiple codebook searches
US5471497A (en) * 1993-11-01 1995-11-28 Zehavi; Ephraim Method and apparatus for variable rate signal transmission in a spread spectrum communication system using coset coding
US5812955A (en) * 1993-11-04 1998-09-22 Ericsson Inc. Base station which relays cellular verification signals via a telephone wire network to verify a cellular radio telephone
US5572552A (en) * 1994-01-27 1996-11-05 Ericsson Ge Mobile Communications Inc. Method and system for demodulation of downlink CDMA signals
CN1083648C (en) 1994-02-17 2002-04-24 普罗克西姆公司 A high-data-rate wireless local-area network
ATE255295T1 (en) * 1994-09-09 2003-12-15 Xircom Wireless Inc TRANSMISSION AND RECEPTION OF CONTINUOUS, PHASE MODULATED SPREAD BAND SIGNALS
US6167253A (en) * 1995-01-12 2000-12-26 Bell Atlantic Network Services, Inc. Mobile data/message/electronic mail download system utilizing network-centric protocol such as Java
US6151491A (en) * 1995-01-12 2000-11-21 Bell Atlantic Network Services, Inc. Mobile voice message/electronic mail system
US5604806A (en) * 1995-01-20 1997-02-18 Ericsson Inc. Apparatus and method for secure radio communication
US5717535A (en) * 1995-01-25 1998-02-10 Seagate Technology, Inc. Block address integrity check for storage medium
KR100220570B1 (en) * 1995-03-16 1999-09-15 김영환 Error detection apparatus of packet exchanger
US7020111B2 (en) 1996-06-27 2006-03-28 Interdigital Technology Corporation System for using rapid acquisition spreading codes for spread-spectrum communications
US6788662B2 (en) * 1995-06-30 2004-09-07 Interdigital Technology Corporation Method for adaptive reverse power control for spread-spectrum communications
US5841768A (en) 1996-06-27 1998-11-24 Interdigital Technology Corporation Method of controlling initial power ramp-up in CDMA systems by using short codes
US6816473B2 (en) 1995-06-30 2004-11-09 Interdigital Technology Corporation Method for adaptive forward power control for spread-spectrum communications
ZA965340B (en) 1995-06-30 1997-01-27 Interdigital Tech Corp Code division multiple access (cdma) communication system
USRE38523E1 (en) 1995-06-30 2004-06-01 Interdigital Technology Corporation Spreading code sequence acquisition system and method that allows fast acquisition in code division multiple access (CDMA) systems
US6697350B2 (en) 1995-06-30 2004-02-24 Interdigital Technology Corporation Adaptive vector correlator for spread-spectrum communications
US6801516B1 (en) 1995-06-30 2004-10-05 Interdigital Technology Corporation Spread-spectrum system for assigning information signals having different data rates
US7929498B2 (en) 1995-06-30 2011-04-19 Interdigital Technology Corporation Adaptive forward power control and adaptive reverse power control for spread-spectrum communications
US7123600B2 (en) 1995-06-30 2006-10-17 Interdigital Technology Corporation Initial power control for spread-spectrum communications
US7072380B2 (en) 1995-06-30 2006-07-04 Interdigital Technology Corporation Apparatus for initial power control for spread-spectrum communications
US5940382A (en) 1996-06-27 1999-08-17 Interdigital Technology Corporation Virtual locating of a fixed subscriber unit to reduce re-acquisition time
US6940840B2 (en) 1995-06-30 2005-09-06 Interdigital Technology Corporation Apparatus for adaptive reverse power control for spread-spectrum communications
US6885652B1 (en) 1995-06-30 2005-04-26 Interdigital Technology Corporation Code division multiple access (CDMA) communication system
US5727064A (en) * 1995-07-03 1998-03-10 Lucent Technologies Inc. Cryptographic system for wireless communications
US5909460A (en) 1995-12-07 1999-06-01 Ericsson, Inc. Efficient apparatus for simultaneous modulation and digital beamforming for an antenna array
US5862173A (en) * 1995-12-11 1999-01-19 Ericsson Inc. Re-orthogonalization of wideband CDMA signals
JP2804258B2 (en) 1995-12-12 1998-09-24 松下電器産業株式会社 Digital communication device
US5894473A (en) * 1996-02-29 1999-04-13 Ericsson Inc. Multiple access communications system and method using code and time division
JP3385299B2 (en) * 1996-05-20 2003-03-10 三菱電機株式会社 Spread spectrum communication equipment
US5825812A (en) * 1996-06-06 1998-10-20 Wireless Logic, Inc. Suppressed side lobe direct-sequence-spread-spectrum radio communication method and device
EP0813315A3 (en) * 1996-06-13 1998-06-10 Canon Kabushiki Kaisha Spread spectrum QAM transmission
US5745578A (en) * 1996-06-17 1998-04-28 Ericsson Inc. Apparatus and method for secure communication based on channel characteristics
US6452958B1 (en) 1996-07-30 2002-09-17 Agere Systems Guardian Corp Digital modulation system using extended code set
US6404732B1 (en) 1996-07-30 2002-06-11 Agere Systems Guardian Corp. Digital modulation system using modified orthogonal codes to reduce autocorrelation
US5862182A (en) * 1996-07-30 1999-01-19 Lucent Technologies Inc. OFDM digital communications system using complementary codes
US5831977A (en) * 1996-09-04 1998-11-03 Ericsson Inc. Subtractive CDMA system with simultaneous subtraction in code space and direction-of-arrival space
US5768307A (en) * 1996-09-13 1998-06-16 Telefonaktiebolaget Lm Ericsson Coherent demodulation with decision-directed channel estimation for digital communication
CA2185847A1 (en) * 1996-09-18 1998-03-19 Jean-Paul Chaib Method and apparatus for encoding and decoding digital signals
GB9700854D0 (en) * 1997-01-16 1997-03-05 Scient Generics Ltd Sub-audible acoustic data transmission mechanism
SE9700212L (en) * 1997-01-24 1998-07-25 Ericsson Telefon Ab L M Procedure and arrangement in a communication system
DE19708626C2 (en) * 1997-03-04 1999-08-05 Rohde & Schwarz Radio communication system working according to the spread spectrum method
US5982807A (en) 1997-03-17 1999-11-09 Harris Corporation High data rate spread spectrum transceiver and associated methods
GB2339492B (en) * 1997-05-14 2001-04-18 Seagate Technology Signal space detector for channels utilizing a code having time varying constraints
KR100340829B1 (en) * 1997-06-20 2002-06-20 다니구찌 이찌로오, 기타오카 다카시 Method and device for variable-speed transmission
US6215762B1 (en) * 1997-07-22 2001-04-10 Ericsson Inc. Communication system and method with orthogonal block encoding
KR100264862B1 (en) 1997-07-31 2000-09-01 윤종용 Orthogonal code hopping multiple access communication system
KR100543381B1 (en) 1997-08-11 2006-01-20 시게이트 테크놀로지 엘엘씨 Static viterbi detector for channels utilizing a code having time varying constraints
US6493162B1 (en) 1997-12-05 2002-12-10 Seagate Technology Llc Frame synchronization for viterbi detector
JPH11215028A (en) * 1998-01-28 1999-08-06 Matsushita Electric Ind Co Ltd Cdma spread code estimating device and method therefor
US6198719B1 (en) * 1998-02-27 2001-03-06 Nortel Networks Limited Bi-orthogonal code division multiple access system
US6226318B1 (en) * 1998-03-31 2001-05-01 Zenith Electronics Corporation Detection of code vectors in single frequency, multiple transmitter networks
US6404573B1 (en) * 1998-05-13 2002-06-11 Seagate Technology Llc Full and half-rate signal space detection for channels with a time-varying MTR
US6542484B1 (en) 1998-05-15 2003-04-01 Telefonaktiebolaget Lm Ericsson (Publ) Code allocation for radiocommunication systems
EP0957604B1 (en) 1998-05-15 2005-11-30 Sony Deutschland Gmbh Transmitter and transmitting method increasing the flexibility of code assignment
US6275966B1 (en) * 1998-06-03 2001-08-14 Ericsson, Inc. Error detection for radio transmission including logically combined pseudo-random numbers and related transmitters, receivers, and methods
BR9906605A (en) * 1998-07-20 2000-09-19 Samsung Electronics Co Ltd Device for generating a quasi-orthogonal code mask in a communication system
US6526091B1 (en) * 1998-08-17 2003-02-25 Telefonaktiebolaget Lm Ericsson Communication methods and apparatus based on orthogonal hadamard-based sequences having selected correlation properties
US6798736B1 (en) * 1998-09-22 2004-09-28 Qualcomm Incorporated Method and apparatus for transmitting and receiving variable rate data
US6724813B1 (en) 1998-10-14 2004-04-20 Telefonaktiebolaget Lm Ericsson (Publ) Implicit resource allocation in a communication system
US7173919B1 (en) * 1999-06-11 2007-02-06 Texas Instruments Incorporated Random access preamble coding for initiation of wireless mobile communications sessions
DE60031462T2 (en) * 1999-07-06 2007-02-08 Samsung Electronics Co., Ltd., Suwon Apparatus and method for encoding / decoding a transport format indicator in a CDMA mobile communication system
GB9917985D0 (en) 1999-07-30 1999-09-29 Scient Generics Ltd Acoustic communication system
US7123579B1 (en) * 1999-08-04 2006-10-17 Lg Electronics Inc. Method of transmitting non-orthogonal physical channels in the communications system
KR100429545B1 (en) * 1999-08-17 2004-04-28 삼성전자주식회사 Method for communicating scrambling code id in mobile communication system
DE19953895A1 (en) 1999-11-10 2001-05-17 Bosch Gmbh Robert Method for correlating time-discrete signal sections
US7043022B1 (en) * 1999-11-22 2006-05-09 Motorola, Inc. Packet order determining method and apparatus
ATE542378T1 (en) * 1999-12-01 2012-02-15 Lg Electronics Inc METHOD FOR CREATION AND TRANSMISSION OF OPTIMAL CELL ID CODES
US7280975B1 (en) 2000-07-24 2007-10-09 Donner Irah H System and method for determining and/or transmitting and/or establishing communication with a mobile device user for providing, for example, concessions, tournaments, competitions, matching, reallocating, upgrading, selling tickets, other event admittance means, goods and/or services
US7562051B1 (en) 2000-07-24 2009-07-14 Donner Irah H System and method for reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services
US7216109B1 (en) 2000-07-24 2007-05-08 Donner Irah H System and method for reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services
US7562028B1 (en) 2000-07-24 2009-07-14 Donner Irah H System and method for determining and/or transmitting and/or establishing communication with a mobile device user for providing, for example, concessions, tournaments, competitions, matching, reallocating, upgrading, selling tickets, and other event admittance mean
US7386517B1 (en) 2000-07-24 2008-06-10 Donner Irah H System and method for determining and/or transmitting and/or establishing communication with a mobile device user for providing, for example, concessions, tournaments, competitions, matching, reallocating, upgrading, selling tickets, other event admittance means, goods and/or services
US7162454B1 (en) 2000-07-24 2007-01-09 Donner Irah H System and method for reallocating and/or upgrading and/or selling tickets, other even admittance means, goods and/or services
US7031945B1 (en) 2000-07-24 2006-04-18 Donner Irah H System and method for reallocating and/or upgrading and/or rewarding tickets, other event admittance means, goods and/or services
DE10036898A1 (en) * 2000-07-28 2002-02-07 Siemens Ag Operator boundary cell identification scheme uses control channel speeds code acquisition
AU2002221485A1 (en) * 2000-11-15 2002-05-27 Go-Cdma Limited Non-linear code-division multiple access technology with improved detection algorithms and error correction coding
US6944206B1 (en) * 2000-11-20 2005-09-13 Ericsson Inc. Rate one coding and decoding methods and systems
ES2388357T3 (en) 2000-11-30 2012-10-11 Intrasonics S.A.R.L. Mobile phone to collect audience index data
AU2211102A (en) * 2000-11-30 2002-06-11 Scient Generics Ltd Acoustic communication system
GB2370472B (en) * 2000-12-21 2004-07-21 Ubinetics Ltd Coding
US7321601B2 (en) * 2001-09-26 2008-01-22 General Atomics Method and apparatus for data transfer using a time division multiple frequency scheme supplemented with polarity modulation
US6912240B2 (en) * 2001-11-26 2005-06-28 Time Domain Corporation Method and apparatus for generating a large number of codes having desirable correlation properties
US7075885B2 (en) * 2001-12-03 2006-07-11 Motorola, Inc. Method for assigning variable-length walsh codes for code division multiple access communications systems
US8248528B2 (en) 2001-12-24 2012-08-21 Intrasonics S.A.R.L. Captioning system
US6973579B2 (en) 2002-05-07 2005-12-06 Interdigital Technology Corporation Generation of user equipment identification specific scrambling code for the high speed shared control channel
US20040001539A1 (en) * 2002-06-26 2004-01-01 Sankaran Sundar G. Training using overhead data in a wireless communications network
US7363039B2 (en) 2002-08-08 2008-04-22 Qualcomm Incorporated Method of creating and utilizing diversity in multiple carrier communication system
US7649994B1 (en) * 2002-11-01 2010-01-19 Nortel Networks Limited System and method for decoding CDMA quality channel
WO2006004550A2 (en) * 2004-07-06 2006-01-12 Telefonaktiebolaget Lm Ericsson (Publ) Non-contiguous variable length orthogonal codes
WO2006052774A2 (en) * 2004-11-09 2006-05-18 Motorola, Inc. A transmitter and a receiver for communicating a signal from multiple antennas using a preamble
US8169890B2 (en) * 2005-07-20 2012-05-01 Qualcomm Incorporated Systems and method for high data rate ultra wideband communication
JP2007189659A (en) * 2005-12-15 2007-07-26 Toshiba Corp Encryption device, encryption method, and encryption program
US7911935B2 (en) * 2006-02-08 2011-03-22 Motorola Mobility, Inc. Method and apparatus for interleaving sequence elements of an OFDMA synchronization channel
US7983143B2 (en) * 2006-02-08 2011-07-19 Motorola Mobility, Inc. Method and apparatus for initial acquisition and cell search for an OFDMA system
US7706249B2 (en) * 2006-02-08 2010-04-27 Motorola, Inc. Method and apparatus for a synchronization channel in an OFDMA system
US8139660B2 (en) * 2006-04-14 2012-03-20 Qualcomm Incorporated Methods and apparatus related to using a wireless terminal scrambling identifier
KR100766313B1 (en) 2006-05-30 2007-10-11 삼성전자주식회사 Apparatus and method for encrypting of preservation key in mobile communication terminal
US8229427B2 (en) 2006-07-14 2012-07-24 Qualcomm Incorporated Status validation for terminals in a wireless communication system
JP4818045B2 (en) * 2006-09-28 2011-11-16 株式会社東芝 Wireless communication device
WO2008041940A2 (en) * 2006-10-05 2008-04-10 Telefonaktiebolaget Lm Ericsson (Publ) Uplink reference signal hopping in cellular telecommunication system
WO2008086532A1 (en) 2007-01-11 2008-07-17 Qualcomm Incorporated Using dtx and drx in a wireless communication system
US20090135804A1 (en) * 2007-11-26 2009-05-28 Francis Swarts Method And System For Ordering Sequences For Synchronization Signaling In A Wireless System
DK2243229T4 (en) 2008-02-04 2022-10-10 Nokia Technologies Oy METHOD AND APPARATUS FOR TRANSMITTING ANTENNA CONFIGURATION INFORMATION BY MASKING
EP2096884A1 (en) 2008-02-29 2009-09-02 Koninklijke KPN N.V. Telecommunications network and method for time-based network access
US8514818B2 (en) 2008-04-25 2013-08-20 Nokia Corporation System and methods for generating masking sequences
US8619901B2 (en) * 2008-04-25 2013-12-31 Sharp Laboratories Of America, Inc. Systems and methods for providing unequal message protection
GB2460306B (en) 2008-05-29 2013-02-13 Intrasonics Sarl Data embedding system
US7948332B2 (en) * 2008-09-30 2011-05-24 Raytheon Company N-channel multiplexer
US8928524B1 (en) * 2009-11-06 2015-01-06 Technology Service Corporation Method and system for enhancing data rates
RU2450439C1 (en) * 2010-11-11 2012-05-10 Учреждение Российской академии наук Институт проблем информатики РАН (ИПИ РАН) Digital data encoding and decoding method based on digital holography principle
KR102028329B1 (en) * 2012-06-01 2019-10-07 한국전자통신연구원 Apparatus and method for separating multiple broadcasting signals for terrestrial cloud trasmission
US10581462B2 (en) * 2015-12-01 2020-03-03 Huawei Technologies Co., Ltd. Signature-enabled polar encoder and decoder
DE102021111633A1 (en) 2020-05-08 2021-11-11 Mediatek Singapore Pte. Ltd. Methods and apparatus for multiple link device (MLD) address discovery in a radio network

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134071A (en) * 1971-07-19 1979-01-09 Licentia Patent-Verwaltungs-G.M.B.H. SSMA Data transmission system
US4052565A (en) * 1975-05-28 1977-10-04 Martin Marietta Corporation Walsh function signal scrambler
US4293953A (en) * 1979-12-28 1981-10-06 The United States Of America As Represented By The Secretary Of The Army Bi-orthogonal PCM communications system employing multiplexed noise codes
US4644560A (en) * 1982-08-13 1987-02-17 Hazeltine Corporation Intranetwork code division multiple access communication system
US4470138A (en) * 1982-11-04 1984-09-04 The United States Of America As Represented By The Secretary Of The Army Non-orthogonal mobile subscriber multiple access system
US4455662A (en) * 1983-05-25 1984-06-19 Gutleber Frank S Noise code generator and pulse compression communications system
US4568915A (en) * 1983-11-14 1986-02-04 The United States Of America As Represented By The Secretary Of The Army Code generator for multilevel interleaved multiplexed noise codes
US4901307A (en) * 1986-10-17 1990-02-13 Qualcomm, Inc. Spread spectrum multiple access communication system using satellite or terrestrial repeaters
FR2629931B1 (en) * 1988-04-08 1991-01-25 Lmt Radio Professionelle ASYNCHRONOUS DIGITAL CORRELATOR AND DEMODULATORS COMPRISING SUCH A CORRELATOR
SE463540B (en) * 1988-09-19 1990-12-03 Ericsson Telefon Ab L M SEAT TO DIGITALIZE ANY RADIO SIGNALS IN A RADIO COMMUNICATION SYSTEM AND DEVICE TO EXERCISE THE SET
CH676179A5 (en) * 1988-09-29 1990-12-14 Ascom Zelcom Ag
US4930140A (en) * 1989-01-13 1990-05-29 Agilis Corporation Code division multiplex system using selectable length spreading code sequences
US5056109A (en) * 1989-11-07 1991-10-08 Qualcomm, Inc. Method and apparatus for controlling transmission power in a cdma cellular mobile telephone system
US5101501A (en) * 1989-11-07 1992-03-31 Qualcomm Incorporated Method and system for providing a soft handoff in communications in a cdma cellular telephone system
US5109390A (en) * 1989-11-07 1992-04-28 Qualcomm Incorporated Diversity receiver in a cdma cellular telephone system
US5022049A (en) * 1989-11-21 1991-06-04 Unisys Corp. Multiple access code acquisition system
US5048057A (en) * 1990-01-02 1991-09-10 At&T Bell Laboratories Wireless local area network
SE465797B (en) * 1990-03-07 1991-10-28 Ericsson Telefon Ab L M PROCEDURE TO TRANSFER SYNCHRONIZATION INFORMATION FOR CRYPED TRANSFER IN A MOBILE RADIO SYSTEM
US5103459B1 (en) * 1990-06-25 1999-07-06 Qualcomm Inc System and method for generating signal waveforms in a cdma cellular telephone system
US5091942A (en) * 1990-07-23 1992-02-25 Ericsson Ge Mobile Communications Holding, Inc. Authentication system for digital cellular communications
US5151919A (en) * 1990-12-17 1992-09-29 Ericsson-Ge Mobile Communications Holding Inc. Cdma subtractive demodulation
US5136612A (en) * 1990-12-31 1992-08-04 At&T Bell Laboratories Method and apparatus for reducing effects of multiple access interference in a radio receiver in a code division multiple access communication system
US5159608A (en) * 1991-08-28 1992-10-27 Falconer David D Method and apparatus for using orthogonal coding in a communication system

Also Published As

Publication number Publication date
DE69330445D1 (en) 2001-08-23
EP0565506B1 (en) 2001-07-18
FI935526A (en) 1994-01-14
JPH06511371A (en) 1994-12-15
FI935526A0 (en) 1993-12-09
KR100296563B1 (en) 2001-10-24
EP0565506A2 (en) 1993-10-13
EP0565506A3 (en) 1994-05-25
NZ251900A (en) 1996-10-28
DE69330445T2 (en) 2002-05-02
CA2110995C (en) 2002-11-12
AU4026993A (en) 1993-11-18
KR940701615A (en) 1994-05-28
WO1993021709A1 (en) 1993-10-28
BR9305479A (en) 1994-10-11
AU665254B2 (en) 1995-12-21
ES2162810T3 (en) 2002-01-16
US5353352A (en) 1994-10-04
JP3436366B2 (en) 2003-08-11
SG43043A1 (en) 1997-10-17
MX9301960A (en) 1993-10-01
HK1014321A1 (en) 1999-09-24

Similar Documents

Publication Publication Date Title
CA2110995A1 (en) Multiple access coding for radio communications
CA2197640A1 (en) Multiple access coding using bent sequences for mobile radio communications
CA2305264A1 (en) Method and apparatus for generating a stream cipher
EP0957604B1 (en) Transmitter and transmitting method increasing the flexibility of code assignment
US7697689B2 (en) Secure transmission system for a digital trunked radio system
MY107200A (en) Authentication system for digital cellular communications.
AU715112B2 (en) Re-orthogonalization of wideband CDMA signals
CA2411996A1 (en) Method and system for mobile communications
MY108626A (en) System and method for generating signal waveforms in a cdma cellular telephone system.
SE9503343D0 (en) Method for encrypting information
CA2127606A1 (en) Code-division multiple-access mobile telephone system
Nguyen Self-encoded spread spectrum and multiple access communications
GB1584579A (en) Telecommunications system
Zhang et al. Analysis of IS-95 CDMA voice privacy
TH25049EX (en) Multiple access encryption for radio communication
TH25049A (en) Multiple access encryption for radio communication
ITMI932413A0 (en) IDENTITY AUTHENTICATION METHOD SUITABLE FOR MOBILE RADIO APPLICATIONS, TELEPHONE EQUIPMENT AND SECURITY UNIT SUITABLE FOR IMPLEMENTING THE SAME.
Rao et al. Waveform design of FH-BFSK communication system useful for mobile telephone subscribers
Dudkov et al. Chip-interleaved decorrelation in asynchronous DS CDMA
Zhang et al. A new performance analysis of STBC under CDMA multiuser environment
Twiggs et al. Performance of a direct sequence code division multiple access cellular network
ATE218234T1 (en) PROTECTED READING OF AN ENCODED CRYPTOGRAPHIC KEY

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20040408