US Patent No: 5,353,352

Number of patents in Portfolio can not be more than 2000

Multiple access coding for radio communications

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

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.

Loading the Abstract Image... loading....

First Claim

See full text

all claims..

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
ERICSSON GE MOBILE COMMUNICATIONS INC.LYNCHBURG, VA375

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bottomley, Gregory E Cary, NC 189 2381
Dent, Paul W Pittsboro, NC 318 11862

Cited Art Landscape

Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (5)
4,901,307 Spread spectrum multiple access communication system using satellite or terrestrial repeaters 1426 1986
5,056,109 Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system 857 1989
5,101,501 Method and system for providing a soft handoff in communications in a CDMA cellular telephone system 800 1989
5,109,390 Diversity receiver in a CDMA cellular telephone system 767 1989
5,103,459 System and method for generating signal waveforms in a CDMA cellular telephone system 1572 1990
 
The United States of America as represented by the Secretary of the Army (3)
4,293,953 Bi-orthogonal PCM communications system employing multiplexed noise codes 34 1979
4,470,138 Non-orthogonal mobile subscriber multiple access system 82 1982
4,568,915 Code generator for multilevel interleaved multiplexed noise codes 12 1983
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (2)
5,048,059 Log-polar signal processing 101 1989
5,091,942 Authentication system for digital cellular communications 191 1990
 
Agilis Corporation (1)
4,930,140 Code division multiplex system using selectable length spreading code sequences 100 1989
 
Ascom Zelcom AG (1)
4,984,247 Digital radio transmission system for a cellular network, using the spread spectrum method 240 1989
 
AT&T Bell Laboratories (1)
5,136,612 Method and apparatus for reducing effects of multiple access interference in a radio receiver in a code division multiple access communication system 103 1990
 
Bell Telephone Laboratories, Incorporated (1)
5,048,057 Wireless local area network 49 1990
 
ERICSSON GE MOBILE COMMUNICATIONS HOLDING INC. (1)
5,151,919 CDMA subtractive demodulation 207 1990
 
ERICSSON INC. (1)
5,060,266 Continuous cipher synchronization for cellular communication system 55 1990
 
Hazeltine Corporation (1)
4,644,560 Intranetwork code division multiple access communication system 38 1985
 
LMT RADIOPROFESSIONNELLE, 46 47, QUAI ALPHONSE LE GALLO-92103-BOULOGNE-BILLANCOURT (FRANCE) (1)
4,933,952 Asynchronous digital correlator and demodulators including a correlator of this type 125 1989
 
MOTOROLA, INC. (1)
5,159,608 Method and apparatus for using orthogonal coding in a communication system 76 1991
 
UNISYS CORPORATION (1)
5,022,049 Multiple access code acquisition system 92 1989
 
Other [Check patent profile for assignment information] (1)
4,455,662 Noise code generator and pulse compression communications system 11 1983

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
INTERDIGITAL TECHNOLOGY CORPORATION (48)
5,841,768 Method of controlling initial power ramp-up in CDMA systems by using short codes 93 1996
5,748,687 Spreading code sequence acquisition system and method that allows fast acquisition in code division multiple access (CDMA) systems 37 1996
6,181,949 Method of controlling initial power ramp-up in CDMA systems by using short codes 23 1998
6,252,866 Virtual locating of a fixed subscriber unit to reduce re-acquisition time 9 1999
RE38523 Spreading code sequence acquisition system and method that allows fast acquisition in code division multiple access (CDMA) systems 28 2000
6,831,905 Spread spectrum system assigning information signals to message-code signals 22 2000
6,801,516 Spread-spectrum system for assigning information signals having different data rates 24 2000
6,493,563 Method of controlling initial power ramp-up in CDMA systems by using short codes 17 2000
7,072,380 Apparatus for initial power control for spread-spectrum communications 29 2000
7,020,111 System for using rapid acquisition spreading codes for spread-spectrum communications 29 2000
6,707,805 Method for initial power control for spread-spectrum communications 22 2000
6,985,467 Rapid acquisition spreading codes for spread-spectrum communications 31 2001
6,983,009 Median weighted tracking for spread-spectrum communications 23 2001
6,721,301 Centroid tracking for spread-spectrum communications 28 2001
6,697,350 Adaptive vector correlator for spread-spectrum communications 30 2001
6,456,608 Adaptive vector correlator using weighting signals for spread-spectrum communications 64 2001
7,929,498 Adaptive forward power control and adaptive reverse power control for spread-spectrum communications 28 2001
6,940,840 Apparatus for adaptive reverse power control for spread-spectrum communications 35 2001
6,816,473 Method for adaptive forward power control for spread-spectrum communications 19 2001
6,788,662 Method for adaptive reverse power control for spread-spectrum communications 19 2001
7,123,600 Initial power control for spread-spectrum communications 25 2001
6,873,645 Automatic power control system for a code division multiple access (CDMA) communications system 12 2001
6,980,538 Virtual locating of a fixed subscriber unit to reduce reacquisition time 0 2001
7,502,406 Automatic power control system for a code division multiple access (CDMA) communications system 9 2002
6,879,841 Method employed by a subscriber unit for controlling initial power ramp-up using short codes 13 2002
6,577,876 Base station for controlling initial power ramp-up using short codes 17 2002
6,571,105 Method employed by a base station for controlling initial power ramp-up using short codes 15 2002
6,519,474 Subscriber unit for controlling initial power ramp-up using short codes 12 2002
6,507,745 Apparatus for controlling initial power ramp-up in a CDMA system by using short codes 15 2002
6,490,462 Method of controlling initial power ramp-up in a CDMA system by using short codes 17 2002
6,904,294 Subscriber unit for controlling initial power ramp-up using short codes 18 2002
6,778,840 Method of controlling initial power ramp-up in a CDMA system by using short codes 14 2002
6,606,503 Apparatus for controlling initial power ramp-up in a CDMA system by using short codes 18 2002
7,085,583 Communication unit for access 12 2003
6,839,567 Method employed by a base station for controlling initial power ramp-up using short codes 16 2003
7,756,190 Transferring voice and non-voice data 2 2003
7,593,453 Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system 5 2004
7,903,613 Code division multiple access (CDMA) communication system 4 2004
7,117,004 Method and subscriber unit for performing an access procedure 15 2004
7,535,874 Method and apparatus for adaptive power control for spread-spectrum communications 22 2004
7,218,625 Initial power control for spread-spectrum communications 0 2004
8,009,636 Method and apparatus for performing an access procedure 2 2005
7,286,847 Method and apparatus for performing an access procedure 10 2005
7,190,966 Method and apparatus for performing an access procedure 12 2005
7,706,332 Method and subscriber unit for performing power control 8 2005
7,873,328 Subscriber unit for performing an access procedure 1 2008
7,706,830 Method and subscriber unit for performing an access procedure 4 2008
8,737,363 Code division multiple access (CDMA) communication system 0 2011
 
EASTERN IX GROUP LLC (17)
7,031,945 System and method for reallocating and/or upgrading and/or rewarding tickets, other event admittance means, goods and/or services 112 2001
7,162,454 System and method for reallocating and/or upgrading and/or selling tickets, other even admittance means, goods and/or services 69 2003
7,216,109 System and method for reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services 113 2003
7,280,975 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 83 2005
7,203,665 System and method for interactive messaging and/or allocating and/or upgrading and/or rewarding tickets, other event admittance means, goods and/or services 22 2006
7,343,350 System and method for interactive messaging and/or allocating and/or upgrading and/or rewarding tickets, other event admittance means, goods and/or services 7 2006
7,379,891 System and method for reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services 9 2006
7,415,424 System and method for reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services 26 2006
7,386,517 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 30 2006
7,617,159 System and method for interactive messaging and/or allocating and/or upgrading and/or rewarding tickets, other event admittance means, goods and/or services 4 2007
7,577,619 System method reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services 4 2007
7,577,620 System and method for reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services 14 2007
7,565,328 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 means, goods and/or services 12 2007
7,529,713 System and method for interactive messaging and/or allocating and/or upgrading and/or rewarding tickets, other event admittance means, goods and/or services 7 2008
7,562,028 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 9 2008
7,562,051 System and method for reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services 16 2008
7,577,575 System method reallocating and/or upgrading and/or selling tickets, other event admittance means, goods and/or services 10 2008
 
ERICSSON INC. (12)
5,812,955 Base station which relays cellular verification signals via a telephone wire network to verify a cellular radio telephone 48 1994
5,604,806 Apparatus and method for secure radio communication 30 1995
5,909,460 Efficient apparatus for simultaneous modulation and digital beamforming for an antenna array 143 1995
5,862,173 Re-orthogonalization of wideband CDMA signals 11 1995
5,894,473 Multiple access communications system and method using code and time division 172 1996
5,742,678 Multiple access coding for radio communications 25 1996
5,745,578 Apparatus and method for secure communication based on channel characteristics 16 1996
5,771,288 Multiple access coding for radio communications 31 1997
6,215,762 Communication system and method with orthogonal block encoding 27 1997
6,256,514 Secure radio personal communications system and method 5 1998
6,404,821 Digital beamformer for receiving a first number of information signals using a second number of antenna array elements 13 1999
6,219,375 Apparatus for performing multiplication of a vector of multi-bit values by a matrix of multi-bit coefficients 4 1999
 
INTRASONICS S.A.R.L. (7)
7,505,823 Acoustic communication system 6 2000
7,796,978 Communication system for receiving and transmitting data using an acoustic data channel 2 2001
7,460,991 System and method for shaping a data signal for embedding within an audio signal 13 2001
8,248,528 Captioning system 1 2002
7,796,676 Signalling system 2 2004
8,185,100 Communication system 1 2010
8,560,913 Data embedding system 0 2011
 
MOTOROLA MOBILITY LLC (6)
7,075,885 Method for assigning variable-length walsh codes for code division multiple access communications systems 2 2001
7,983,143 Method and apparatus for initial acquisition and cell search for an OFDMA system 5 2006
7,911,935 Method and apparatus for interleaving sequence elements of an OFDMA synchronization channel 6 2006
7,706,249 Method and apparatus for a synchronization channel in an OFDMA system 13 2006
8,767,525 Method and apparatus for initial acquisition and cell search for an OFDMA system 0 2011
8,780,690 Method and apparatus for interleaving sequence elements of an OFDMA synchronization channel 0 2012
 
QUALCOMM INCORPORATED (6)
5,471,497 Method and apparatus for variable rate signal transmission in a spread spectrum communication system using coset coding 88 1993
6,798,736 Method and apparatus for transmitting and receiving variable rate data 40 1998
7,315,531 Method and apparatus for transmitting and receiving variable rate data 5 2004
8,169,890 Systems and method for high data rate ultra wideband communication 1 2006
7,961,592 Method and apparatus for transmitting and receiving variable rate data 0 2007
8,576,893 Systems and methods for high data rate ultra wideband communication 0 2009
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (6)
7,212,820 Mobile assisted handover using CDMA 10 1995
5,768,307 Coherent demodulation with decision-directed channel estimation for digital communication 49 1996
6,091,761 Despreading method and arrangement in communication system 11 1998
7,248,874 Mobile assisted handover using CDMA 2 2003
8,526,482 Non-contiguous variable length orthogonal codes 1 2005
8,004,959 Different orthogonal code sets with members in common 2 2005
 
SEAGATE TECHNOLOGY LLC (5)
5,717,535 Block address integrity check for storage medium 13 1995
5,936,558 Signal space detector for channels utilizing a code having time varying constraints 9 1998
6,212,661 Static viterbi detector for channels utilizing a code having time varying constraints 9 1998
6,404,573 Full and half-rate signal space detection for channels with a time-varying MTR 1 1998
6,493,162 Frame synchronization for viterbi detector 49 1998
 
UNWIRED PLANET, LLC (5)
5,831,977 Subtractive CDMA system with simultaneous subtraction in code space and direction-of-arrival space 27 1996
6,542,484 Code allocation for radiocommunication systems 21 1998
6,275,966 Error detection for radio transmission including logically combined pseudo-random numbers and related transmitters, receivers, and methods 4 1998
6,526,091 Communication methods and apparatus based on orthogonal hadamard-based sequences having selected correlation properties 68 1998
6,944,206 Rate one coding and decoding methods and systems 13 2000
 
AGERE SYSTEMS LLC (3)
6,404,732 Digital modulation system using modified orthogonal codes to reduce autocorrelation 28 1998
6,452,958 Digital modulation system using extended code set 36 1998
7,583,582 M-ary orthogonal keying system 3 2006
 
SAMSUNG ELECTRONICS CO., LTD. (3)
6,657,985 Orthogonal code hopping multiple access communication system 9 1998
7,221,695 Method for communicating scrambling code ID in mobile communication system 9 2000
7,869,454 Method for communicating scrambling code ID in mobile communication system 1 2005
 
ERICSSON GE MOBILE COMMUNICATIONS INC. (2)
5,572,552 Method and system for demodulation of downlink CDMA signals 71 1994
5,550,809 Multiple access coding using bent sequences for mobile radio communications 73 1994
 
VERIZON PATENT AND LICENSING INC. (2)
6,151,491 Mobile voice message/electronic mail system 91 1997
6,167,253 Mobile data/message/electronic mail download system utilizing network-centric protocol such as Java 218 1997
 
AGERE SYSTEMS INC. (1)
7,079,567 Digital modulation system using extended code set 9 2002
 
APPLE INC. (1)
7,649,994 System and method for decoding CDMA quality channel 0 2003
 
CDC PROPRIETE INTELLECTUELLE (1)
7,043,022 Packet order determining method and apparatus 6 1999
 
GENERAL ATOMICS (1)
8,149,879 Method and apparatus for data transfer using a time division multiple frequency scheme supplemented with polarity modulation 2 2008
 
INTELLECTUAL VENTURES I LLC (1)
RE40231 High data spread spectrum transceiver and associated methods 6 2001
 
INTERDIGITAL COMMUNICATIONS CORPORATION (1)
7,437,177 Method employed by a base station for controlling initial power ramp-up using short codes 20 2008
 
KABUSHIKI KAISHA TOSHIBA (1)
8,483,187 Wireless communication system and wireless communication method 0 2011
 
LG ELECTRONICS INC. (1)
7,123,579 Method of transmitting non-orthogonal physical channels in the communications system 11 2000
 
LSI CORPORATION (1)
8,514,690 M-ary orthogonal keying system 0 2011
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
6,487,237 Spreading code estimating apparatus and spreading code estimating method 4 1999
 
MCGILL UNIVERSITY (1)
5,870,414 Method and apparatus for encoding and decoding digital signals 20 1996
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
6,628,667 Variable rate transmitting method and apparatus using bi-orthogonal functions for variable rate transmission rates above a predetermined value 45 1999
 
NOKIA CORPORATION (1)
8,514,818 System and methods for generating masking sequences 0 2008
 
NORTEL NETWORKS LIMITED (1)
6,198,719 Bi-orthogonal code division multiple access system 29 1998
 
NVERA HOLDINGS, INC. (1)
5,717,824 Adaptive speech coder having code excited linear predictor with multiple codebook searches 21 1993
 
PATTON ENTERPRISES, INC. (1)
6,031,913 Apparatus and method for secure communication based on channel characteristics 15 1998
 
RAYTHEON COMPANY (1)
7,948,332 N-channel multiplexer 0 2008
 
SCC COMMUNICATIONS CORP. (1)
7,106,690 Method for generating and transmitting optimal cell ID codes 4 2000
 
SHARP KABUSHIKI KAISHA (1)
8,619,901 Systems and methods for providing unequal message protection 0 2008
 
SYMBOL TECHNOLOGIES, INC. (1)
6,473,449 High-data-rate wireless local-area network 96 2000
 
TEXAS INSTRUMENTS INCORPORATED (1)
7,173,919 Random access preamble coding for initiation of wireless mobile communications sessions 6 2000
 
TIME DOMAIN CORPORATION (1)
6,912,240 Method and apparatus for generating a large number of codes having desirable correlation properties 60 2001
 
UBINETICS LIMITED (1)
7,379,610 Methods of, and apparatus for, producing code words 0 2001
 
UNWIRED PLANET, INC. (1)
6,724,813 Implicit resource allocation in a communication system 43 1998
 
UTSTARCOM KOREA LIMITED (C/O OF UTSTARCOM, INC.) (1)
5,703,886 Error detecting apparatus for packet exchange 2 1996
 
Wireless Logic, Inc. (1)
5,825,812 Suppressed side lobe direct-sequence-spread-spectrum radio communication method and device 3 1996