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101.发明专利
公开(公告)号：MX2009002035A
公开(公告)日：2009-05-11
申请号：MX2009002035
申请日：2007-08-23
Applicant: INTERDIGITAL TECH CORP
Inventor： KOO CHANG-SOO , BULTAN AYKUT , GAMAL HESHAM EL
IPC: H04L1/06
Abstract: La comunicación de enlace a tierra (DL) de palabras clave de canal único se soporta al proporcionar un transmisor y receptor de múltiples entradas múltiples salidas (MIMO). El transmisor incluye antenas de transmisión NT para transmitir corrientes espaciales a un receptor que tiene antenas de recepción NR, un precodificador y una unidad de construcción de matriz de espacio-frecuencia o espacio-tiempo en comunicación con el precodificador y las antenas de transmisión. La unidad de construcción de matriz de espacio-frecuencia o espacio-tiempo construye una matriz que define una palabra clave de espacio-tiempo algebraica ensartada (TAST) basada en un número de antenas virtuales, NV, y el número de antenas de transmisión, NT. El transmisor opera en un modo de ciclo abierto cuando no se encuentra disponible la información de retroalimentación del receptor, un modo de ciclo semi-abierto cuando la información de rango de canal se encuentra disponible, y un modo de ciclo cerrado cuando la información del estado de canal (CSI) se encuentra disponible. El receptor se configura para proporcionar la retroalimentación al transmisor en una base de corriente espacial recibida por per.
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公开(公告)号：DE602004012885T2
公开(公告)日：2009-04-09
申请号：DE602004012885
申请日：2004-11-03
Applicant: INTERDIGITAL TECH CORP
Inventor： BULTAN AYKUT , GRIECO DONALD M , DENNEAN CHARLES , PAN JUNG-LIN
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公开(公告)号：AU2005272789B2
公开(公告)日：2009-02-05
申请号：AU2005272789
申请日：2005-08-11
Applicant: INTERDIGITAL TECH CORP
Inventor： KWAK JAEYOUNG , BULTAN AYKUT , HUANG YUEJIN , OZLUTURK FATIH , ZEIRA ELDAD , OLESEN ROBERT LIND , PASAD KALPENDU R , KOO CHANG-SOO
Abstract: The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.
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104.发明专利
公开(公告)号：CA2661637A1
公开(公告)日：2008-02-28
申请号：CA2661637
申请日：2007-08-23
Applicant: INTERDIGITAL TECH CORP
Inventor： EL GAMAL HESHAM , BULTAN AYKUT , KOO CHANG-SOO
Abstract: The downlink (DL) communication of single channel codewords is supported by providing a multiple-input multiple-output (MIMO) transmitter and receive r. The transmitter includes N T transmit antennas for transmitting spatial s treams to a receiver having N R receive antennas, a precoder and a space- ti me or space-frequency matrix construction unit in communication with the pre coder and the transmit antennas. The space-time or space-frequency matrix co nstruction unit constructs a matrix that defines a threaded algebraic space- time (TAST) codeword based on a number of virtual antennas, N V, and the nu mber of transmit antennas, N T. The transmitter operates in an open loop mod e when no feedback information from the receiver is available, a semi-open l oop mode when channel rank information is available, and a closed loop mode when channel state information (CSI) is available. The receiver is configure d to provide feedback to the transmitter on a per received spatial stream ba sis.
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公开(公告)号：NO20081022L
公开(公告)日：2008-02-26
申请号：NO20081022
申请日：2008-02-26
Applicant: INTERDIGITAL TECH CORP
Inventor： PAN JUNG-LIN , BULTAN AYKUT , YANG RUI , KEARNEY KENNETH P
IPC: H04B1/06
Abstract: A method and apparatus for automatically correcting the frequency of a local oscillator of a receiver. A primary common pilot channel (CPICH) code sequence is generated by a CPICH code generator based on a reference cell identification signal and a frame start signal. The received despread CPICH code sequence is used to generate an estimated frequency error signal. A control voltage signal is generated by a control voltage generator based on the estimated frequency error signal. The CPICH code generator generates the CPICH code sequence based on signals received from a high speed downlink packet access (HSDPA) serving cell when HSDPA is active, or a timing reference cell when HSDPA is not active. The present invention achieves full maximum ratio combining gain when space time transmit diversity (STTD) is used, even without receiving a transmit diversity indication.
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Patent Agency Ranking106.发明专利
公开(公告)号：MX2007001764A
公开(公告)日：2007-07-11
申请号：MX2007001764
申请日：2005-08-11
Applicant: INTERDIGITAL TECH CORP
Inventor： OZLUTURK FATIH , HUANG YUEJIN , ZEIRA ELDAD , KOO CHANG-SOO , BULTAN AYKUT , OLESEN ROBERT LIND , KWAK JAEYOUNG , PASAD KALPENDU R
Abstract: La presente invencion se refiere a un metodo y aparato para implementar la codificacion por bloques en espacio y frecuencia (SFBC) en un sistema de comunicaciones inalambricas multiplex por division de frecuencia ortogonal (OFDM). La presente invencion se aplica tanto a un modo de bucle cerrado como a un modo de bucle abierto. En el modo de bucle cerrado, la carga de potencia y la formacion del haz propio se realizan en base a la informacion del estado del canal (CSI). Una corriente de datos codificada en el canal se multiplexa en dos o mas corrientes de datos. La carga de potencia se efectua en base a la CSI en cada una de las corrientes de datos multiplexadas. La codificacion SFBC se realiza en las corrientes de datos para cada una de las subportadoras agrupadas en pares. Luego, se realiza una formacion de haces propios en base a la CSI para distribuir los haces propios en multiples antenas de transmision. La carga de potencia puede realizarse en dos o mas bloques de codificacion SFBC o en cada modo propio. Adicionalmente, la carga de potencia puede efectuarse a traves de las subportadoras o grupos de subportadoras para modos propios debiles.
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公开(公告)号：NO20063226L
公开(公告)日：2006-09-18
申请号：NO20063226
申请日：2006-07-11
Applicant: INTERDIGITAL TECH CORP
Inventor： KAZAKEVICH LEONID , HAIM JOHN W , BULTAN AYKUT
Abstract: A wireless transmit/receive unit (WTRU) uses an oscillator providing accuracy for synchronized communications parameters in an active mode, and operates at reduced power during a discontinuous reception (DRX) mode. A real time clock (RTC) is used as the frequency standard during the reduced power operation, and a frequency adjustment is effected while the RTC is used as the frequency standard. By effecting the frequency adjustment, the RTC is able to be used as the frequency standard for substantial time periods, thereby reducing power consumption of the WTRU during the DRX mode.
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公开(公告)号：DE60207747T2
公开(公告)日：2006-07-27
申请号：DE60207747
申请日：2002-04-15
Applicant: INTERDIGITAL TECH CORP
Inventor： BULTAN AYKUT , GRIECO DONALD
IPC: H04B1/7085 , H04B1/709 , H04L7/02
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公开(公告)号：CA2836722A1
公开(公告)日：2006-05-26
申请号：CA2836722
申请日：2005-11-01
Applicant: INTERDIGITAL TECH CORP
Inventor： KWAK JAEYOUNG , KOO CHANG-SOO , OLESEN ROBERT LIND , BULTAN AYKUT , OZLUTURK FAITH
Abstract: A method and apparatus for combining space-frequency block coding (SFBC), spatial multiplexing (SM) and beamforming in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. The system includes a transmitter with a plurality of transmit antennas and a receiver with a plurality of receive antennas. The transmitter generates at least one data stream and a plurality of spatial streams. The number of generated spatial streams is based on the number of the transmit antennas and the number of the receive antennas. The transmitter determines a transmission scheme in accordance with at least one of SFBC, SM and beam forming. The transmitter transmits data in the data stream to the receiver based on the selected transmission scheme.
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公开(公告)号：CA2576842A1
公开(公告)日：2006-02-23
申请号：CA2576842
申请日：2005-08-11
Applicant: INTERDIGITAL TECH CORP
Inventor： HUANG YUEJIN , ZEIRA ELDAD , BULTAN AYKUT , PASAD KALPENDU R , OLESEN ROBERT LIND , KWAK JAEYOUNG , KOO CHANG-SOO , OZLUTURK FATIH
Abstract: The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.
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