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Li Ye, Sollenberger Nelson Ray, Winters Jack Harriman: Mimo ofdm system. At &Amp T, February 8, 2002: JP2002-044051 (57 worldwide citation)

PROBLEM TO BE SOLVED: To provide a MIMO OFDM system which uses an independent space- time code for each of many transmission antenna sets.SOLUTION: The MIMO OFDM system is provided with a plurality of space- time encoders for encoding each data block assigned with an independent space- time code. Co ...


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Alamouti Siavash, Poon Patrick, Tarokh Vahid: Detection par probabilite maximale a faible complexite de codes despace concatenes pour applications sans fil, Low complexity maximum likelihood detection of concatenated space codes for wireless applications. At&Amp T Wireless Services, At&Amp T Wireless Services, OYEN WIGGS GREEN & MUTALA, May 14, 1999: CA2276207 (22 worldwide citation)

Good transmission characteristics are achieved in the presence of fading with a transmitter that employs a trellis coder followed by a block coder. Correspondingly, the receiver comprises a Viterbi decoder followed by a block decoder. Advantageously, the block coder and decoder employ time-space div ...


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Ghassemzadeh Saeed Seyed, Sherman Matthew James: System and method for adjusting wireless network. At &Amp T, August 10, 2001: JP2001-218252 (20 worldwide citation)

PROBLEM TO BE SOLVED: To provide a system and a method with which a wireless network can be adjusted.SOLUTION: A resource management device, that adjusts the use of an RF network resource to attain effective and impartial use of an available RF resource in an area with high utilizing density, is dis ...


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Bruno Richard Frank, Katseff Howard Paul, Markowitz Robert Edward, Robinson Bethany Scott, Rosen Kenneth H: Methodes et systemes de gestion dynamique du routage dinformation sur un reseau universel integre de communication, Methods and systems for dynamically managing the routing of information over an integrated global communication network. At&Amp T, At&Amp T, KIRBY EADES GALE BAKER, December 23, 2003: CA2249668 (18 worldwide citation)

Methods and systems for routing information in an integratedglobal communications network comprising a signalling systeminterconnecting a source router, a plurality of intermediate routers, adestination router and a routing processor for routing the multimediainformation. The source router receives ...


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Alamouti Siavash, Casas Eduardo F, Hirano Michael, Hoole Elliott, Jesse Mary, Michelson David G, Poon Patrick, Veintimilla Gregory J, Zhang Hongliang: Procede pour les communications duplex a repartition en frequence, Method for frequency division duplex communications. At&Amp T Wireless Services, At&Amp T Wireless Services, OYEN WIGGS GREEN & MUTALA, August 13, 1998: CA2278852 (12 worldwide citation)

The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system's operation. The highly bandwidth-efficient communications method combines a form of time division duplex (TDD), frequenc ...


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Gormley Eamonn: Up link data message receiving method, up link method, communication method, remote unit identifying method, communication system and remote unit. At &Amp T Wireless Services, August 3, 2001: JP2001-211189 (8 worldwide citation)

PROBLEM TO BE SOLVED: To efficiently use resources on a common OFDM high speed data channel without a collision in a plurality of remote units (RU).SOLUTION: Since the collision occurs when ≥2 RUs 14-18 simultaneously perform transmission by the same frequency, a base station 12 transmits a flag to ...


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Chen Juin Hwey: Synthese de signaux dexcitation durant les effacements de trames ou les pertes de paquets, Excitation signal synthesis during frame erasure or packet loss. At&Amp T, KIRBY EADES GALE BAKER, January 19, 1999: CA2142393 (5 worldwide citation)

A speech coding system robust to frame erasure (or packet loss) isdescribed. Illustrative embodiments are directed to a modified version of CCITTstandard G.728. In the event of frame erasure, vectors of an excitation signal aresynthesized based on previously stored excitation signal vectors generate ...


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Erving Richard Henry, Ghassemzadeh Saeed S, Miller Robert Raymond Ii, Rice Christopher W: Multi-antenna/multi-receiver array diversity system. At &Amp T, May 9, 2003: JP2003-134013 (4 worldwide citation)

PROBLEM TO BE SOLVED: To improve a signal-to-noise ratio (SNR) by using a space diversity and polarization diversity.SOLUTION: In the radio communication system for improving the SNR, this system is provided with a plurality of antennas 1A, 1B, 2A, and 2B for respectively supplying signals, a device ...


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Saraswat Vijay Anand: Object enabled real time messaging system. At &Amp T, April 20, 2001: JP2001-109696 (4 worldwide citation)

PROBLEM TO BE SOLVED: To provide an object enabled real time messaging system for enabling two or more persons to mutually communicate while using a real time messaging system and to mutually share an object. SOLUTION: A transmitter generates an object on an application server and transmits a messag ...