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公开(公告)号:AU2009201306A1
公开(公告)日:2009-04-23
申请号:AU2009201306
申请日:2009-04-03
Applicant: INTERDIGITAL TECH CORP
Inventor: OLESEN ROBERT LIND , PASAD KALPENDU R , KOO CHANG-SOO , OZLUTURK FAITH , KWAK JAEYOUNG , ZEIRA ELDAD , HUANG YUEJIN
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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公开(公告)号:NO20072994L
公开(公告)日:2007-08-07
申请号:NO20072994
申请日:2007-06-12
Applicant: INTERDIGITAL TECH CORP
Inventor: OLESEN ROBERT LIND , KOO CHANG-SOO , BULTAN AYKUT , KWAK JAEYOUNG , OZULTURK FAITH
Abstract: The invention relates to a method and a transmitter for transmitting data using multiple-input multiple-output, MIMO, orthogonal frequency division multiplexing, OFDM, the method comprising: a transmitter generating at least one input data stream; the transmitter generating a plurality of spatial streams; the transmitter determining a transmission coding scheme, and processing the input data stream in accordance with the transmission coding scheme to generate at least two spatial streams, the transmission coding scheme being one of spatial multiplexing, SM, without frequency diversity, FD, wherein one data symbol is sent per one sub-carrier for each spatial stream; and the transmitter transmitting the at least two spatial streams via the generated spatial streams.
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公开(公告)号:NO20071169L
公开(公告)日:2007-04-25
申请号:NO20071169
申请日:2007-03-01
Applicant: INTERDIGITAL TECH CORP
Inventor: OLESEN ROBERT LIND , KOO CHANG-SOO
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公开(公告)号:NO20071169A
公开(公告)日:2007-04-25
申请号:NO20071169
申请日:2007-03-01
Applicant: INTERDIGITAL TECH CORP
Inventor: OLESEN ROBERT LIND , KOO CHANG-SOO
CPC classification number: H04B7/0417 , H04B17/336 , H04L1/0002 , H04L1/0026 , H04L5/0023 , H04L5/0046 , H04L5/006 , H04L5/0064 , H04L27/2601 , Y02D50/10
Abstract: A method and apparatus for optimizing the system capacity of an Orthogonal Frequency Division Multiplexing (OFDM) system that uses with Multiple-Input Multiple-Output (MIMO) antennas. In a receiver, a target quality of service (QoS) metric and reference data rate are set. The target QoS metric may be set to a predetermined value and/or may be adjusted dynamically with respect to packet error rate (PER) by a slow outer-loop control processor. The QoS of received signals are measured and compared to the target QoS. Depending on the comparison, the receiver generates a channel quality indicator (CQI) which is sent back to the transmitting transmitter. The CQI is a one or two bit indicator which indicates to the transmitter to disable, adjust or maintain data transmission rates of particular sub-carriers, groups of sub-carriers per transmit antenna, or groups of sub-carriers across all transmit antennas. At the transmitter, the transmitted data rate is disabled, adjusted or maintained. At the receiver, the target QoS metric and reference data rate are adjusted accordingly. This process is repeated for each data frame of each sub-carrier group.
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公开(公告)号:MX2007001709A
公开(公告)日:2007-04-16
申请号:MX2007001709
申请日:2005-07-27
Applicant: INTERDIGITAL TECH CORP
Inventor: ZHANG GUODONG , HUANG YUEJIN , TSAI YINGMING , KOO CHANG-SOO , OLESEN ROBERT LIND
Abstract: Se describen un metodo y sistema para adaptacion de enlace en un sistema de comunicacion inalambrica de multiplexion por division de frecuencia ortogonal (OFDM). Los sub-canales completos se dividen en una pluralidad de grupos. Se genera un indicador de calidad de canal (CQI) para cada grupo en base al estado de calidad del canal en cada grupo, y se ajustan los parametros de comunicacion de acuerdo con el CQI.
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公开(公告)号:MX2007001290A
公开(公告)日:2007-04-02
申请号:MX2007001290
申请日:2005-07-21
Applicant: INTERDIGITAL TECH CORP
Inventor: KOO CHANG-SOO , OLESEN ROBERT LIND
Abstract: Se describe un metodo y aparato para optimizar la capacidad de sistema de un sistema de multiplexado de division de frecuencia ortogonal (OFDM) que se utiliza con antenas de entrada multiple y salida multiple (MIMO). En un receptor, la metrica de calidad de servicio (QoS) y la tasa de datos de referencia son establecidos, la metrica QoS objetivo se puede establecer en un valor predeterminado o se puede ajustar dinamicamente con respecto a una tasa de error de paquete (PER) por un procesador de control de bucle exterior lento. La QoS de las senales recibidas se miden y se comparan con la QoS objetivo. Dependiendo de la comparacion, el receptor genera un indicador de calidad de canal (CQI) el cual es enviado de regreso al transmisor que transmite. El CQI es un indicador de uno o dos bitios el cual indica al transmisor el inhabilitar, ajustar o mantener tasas de transmision de datos de subportadoras particulares, grupos de subportadoras por antena transmisora o grupos de subportadoras a traves de todas las antenas transmisoras. En el transmisor, la tasa de datos transmitidos se inhabilita, se ajusta o se mantiene. En el receptor, la metrica de QoS objetivo y la tasa de datos de referencia se ajusta en consecuencia. Este procedimiento se repite para cada marco de datos de cada grupo de subportadora.
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公开(公告)号:NO20071317A
公开(公告)日:2007-03-12
申请号:NO20071317
申请日:2007-03-12
Applicant: INTERDIGITAL TECH CORP
Inventor: OLESEN ROBERT LIND , KOO CHANG-SOO , BULTAN AYKUT , HUANG YUEJIN , OZLUTURK FATIH , ZEIRA ELDAD , KWAK JAEYOUNG , PASAD KALPENDU R
CPC classification number: H04L1/0606 , H04B7/0417 , H04B7/0626 , H04B7/0632 , H04B7/066 , H04L1/0003 , H04L1/0009 , H04L1/0026 , H04L5/0007 , H04L5/0023 , H04L5/006 , H04L27/156 , H04L27/2626 , H04L2027/0046 , Y02B70/30 , Y02D50/10
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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公开(公告)号:CA2574901A1
公开(公告)日:2006-02-23
申请号:CA2574901
申请日:2005-07-21
Applicant: INTERDIGITAL TECH CORP
Inventor: OLESEN ROBERT LIND , KOO CHANG-SOO
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公开(公告)号:CA2553215A1
公开(公告)日:2005-08-04
申请号:CA2553215
申请日:2005-01-12
Applicant: INTERDIGITAL TECH CORP
Inventor: SHIN SUNG-HYUK , KAEWELL JOHN DAVID JR , REZNIK ALEXANDER , HERSCHAFT RICHARD DAN , HOFFMANN JOHN ERICH , OLESEN ROBERT LIND , CHITRAPU PRABHAKAR R , CHIANG BING A
IPC: H04L9/32 , H04J99/00 , H04L9/14 , H04L29/02 , H04L29/06 , H04M1/66 , H04M1/68 , H04W12/00 , H04W12/02 , H04W12/06 , H04W12/10
Abstract: At least one user data stream is layer 2/3 processed, physical layer process ed and radio frequency processed. A watermark/signature is embedded at at least one of layer 2/3, physical layer or radio frequency, producing an embedded wireless communication. The embedded wireless communication is wirelessly transferred. The embedded wireless communication is received and the watermark/signature is extracted from the embedded wireless communication.
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公开(公告)号:AU2003287680A8
公开(公告)日:2004-06-15
申请号:AU2003287680
申请日:2003-11-17
Applicant: INTERDIGITAL TECH CORP
Inventor: YANG RUI , PIETRASKI PHILIP J , STERNBERG GREGORY S , OLESEN ROBERT LIND
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