公开(公告)号：AT456232T

公开(公告)日：2010-02-15

申请号：AT05785474

申请日：2005-08-11

Applicant: INTERDIGITAL TECH CORP

Inventor： KWAK JAEYOUNG ,  OLESEN ROBERT ,  BULTAN AYKUT ,  ZEIRA ELDAD ,  KOO CHANG-SOO ,  OZLUTURK FATIH ,  HUANG YUEJIN ,  PASAD KALPENDU

IPC: H04J99/00 ,  H04L27/08

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.

公开(公告)号：CA2637810C

公开(公告)日：2010-02-02

申请号：CA2637810

申请日：2000-05-24

Applicant: INTERDIGITAL TECH CORP

Inventor： OZLUTURK FATIH ,  SEZGIN NADIR

IPC: H04W56/00 ,  H04B1/707 ,  H04B7/26 ,  H04J3/00 ,  H04J3/06 ,  H04J13/00 ,  H04L7/00 ,  H04W28/26 ,  H04W74/04 ,  H04W88/02 ,  H04W88/08

Abstract: A base station sends a synchronization signal in an assigned time slot to a user equipment in a time division duplex code division multiple access communication system. The base station has an assigned code group out of a predetermined number of code groups. The base station transmits selected secondary synchronization code signals out of a set of secondary synchronization code signals. The plurality of secondary synchronization code signals number s less than half of the predetermined number of code groups. The user equipmen t identifies the transmitted selected secondary code signals. Based on in part the identified secondary synchronization code signals, the assigned code group i s determined.

公开(公告)号：CA2376313C

公开(公告)日：2008-12-30

申请号：CA2376313

申请日：1996-06-27

Applicant: INTERDIGITAL TECH CORP

Inventor： KOWALSKI JOHN ,  LOMP GARY ,  OZLUTURK FATIH

IPC: H03K3/84 ,  G06F13/374 ,  H03H17/02 ,  H03H17/06 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/711 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/005 ,  H04B7/216 ,  H04B7/26 ,  H04B15/00 ,  H04B17/00 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10 ,  H04J13/12 ,  H04J13/16 ,  H04K1/00 ,  H04L1/00 ,  H04L5/14 ,  H04L7/00 ,  H04L7/033 ,  H04L25/02 ,  H04L27/00 ,  H04L27/20 ,  H04L27/233 ,  H04L27/30 ,  H04N1/333 ,  H04W52/04 ,  H04W52/14 ,  H04W52/24

Abstract: An automatic power control (APC) system for a spread-spectrum communications system includes an automatic forward power control (AFPC) system, and an automatic reverse power control (ARPC) system. In the AFPC, each subscriber unit (SU) measures a forward signal-to-noise ratio of a respective forward channel information signal to generate a respective forward channel error signal which includes a measure of the uncorrelated noise in the channel and a measure of the error between the respective forward signal-to-noise ration and a pre determined signal-to-noise value. A control signal generated from the respective forward channel error signal is transmitted as part of a respective reverse channel information signal. A base unit includes AFPC receivers which receive respective reverse channel information signals and extract the forward channel error signals therefrom to adjust the power levels of the respective forward spread-spectrum signals. In the ARPC system, each base measures a reverse signal-to-noise ratio of each of the respective reverse channel information signals and generates a respective reverse channel error signal which includes a measure of the uncorrelated noise in the channel and a measure of the error between the respective reverse signal-to- noise ratio anda pre determined signal-to-noise value. The base unit transmits a control signal generated from the respective reverse channel error signal as a part of a respective forward channel information signal. Each SU includes an ARPC receiver which receives the forward channel information signal and extracts the respective reverse error signal to adjust the reverse transmit power level of the respective reverse spread-spectrum signal.

公开(公告)号：AT415740T

公开(公告)日：2008-12-15

申请号：AT02784077

申请日：2002-10-10

Applicant: INTERDIGITAL TECH CORP

Inventor： DEMIR ALPASLAN ,  OZLUTURK FATIH

IPC: H04B1/707 ,  H04B1/7073 ,  H04B1/7077 ,  H04B1/708 ,  H04B1/7093 ,  H04B7/216 ,  H04B7/26 ,  H04L7/08

Abstract: A User Equipment (UE) receives and samples communication signals, where the communication signals have a time frame format, a transmission chip rate and a synchronization code associated with a time slot that includes a midamble that indicates a modulation of the synchronization code where a specified modulation of received synchronization codes identifies the timing for a timeslot in which data is to be received. The UE preferably includes a synchronization code determination circuit, a midamble determination circuit, and a phase modulation sequence detection circuit operatively associated with the midamble determination circuit. The UE can be configured for use with the low chip rate option of the Third Generation Partnership Project (3GPP) Universal Mobile Telecommunication System (UMTS) standards that employ a predefined set of downlink SYNC codes that point to midambles which indicate SYNC code modulation sequence to enable reading of data in a subsequent Broadcast Channel (BCH) message.

公开(公告)号：CA2578811C

公开(公告)日：2008-10-21

申请号：CA2578811

申请日：2000-05-24

Applicant: INTERDIGITAL TECH CORP

Inventor： SEZGIN NADIR ,  OZLUTURK FATIH

IPC: H04B1/707 ,  H04B7/26 ,  H04J3/00 ,  H04J3/06 ,  H04J13/00 ,  H04L7/00 ,  H04W28/26 ,  H04W56/00 ,  H04W74/04 ,  H04W88/08

公开(公告)号：BRPI0516688A

公开(公告)日：2008-09-16

申请号：BRPI0516688

申请日：2005-11-01

Applicant: INTERDIGITAL TECH CORP

Inventor： KWAK JAEYOUNG ,  KOO CHANG-SOO ,  OLESEN ROBERT LIND ,  BULTAN AYKUT ,  OZLUTURK FATIH

IPC: H04J99/00 ,  H04K1/10 ,  H04B7/02 ,  H04L1/02 ,  H04L27/00

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.

公开(公告)号：FI119163B

公开(公告)日：2008-08-15

申请号：FI974554

申请日：1997-12-18

Applicant: INTERDIGITAL TECH CORP

Inventor： LOMP GARY R ,  OZLUTURK FATIH ,  KOWALSKI JOHN ,  REGIS ROBERT ,  LUDDY MICHAEL ,  MARRA ALEXANDER ,  JACQUES ALEXANDER ,  SILVERBERG AVI

IPC: H03K3/84 ,  G06F13/374 ,  H03H17/02 ,  H03H17/06 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/711 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/005 ,  H04B7/216 ,  H04B7/26 ,  H04B15/00 ,  H04B17/00 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10 ,  H04J13/12 ,  H04J13/16 ,  H04K1/00 ,  H04L1/00 ,  H04L5/14 ,  H04L7/00 ,  H04L7/033 ,  H04L25/02 ,  H04L27/00 ,  H04L27/20 ,  H04L27/233 ,  H04L27/30 ,  H04N1/333 ,  H04W52/04 ,  H04W52/14 ,  H04W52/24

Abstract: The invention provides a spread spectrum communication system for maintaining an initial transmit power level of a communication station during periods of inactivity. The system comprises a first station (501) and a second station (502), the initial transmit power level of which is maintained, wherein the first station generates an automatic power control signal by comparing a measured noise power level in a communication channel and an estimated system transmit power level and the second station occasionally transmits a spread spectrum signal whilst in an inactive state and receives the automatic power control signal to adjust an initial transmit power level thereof.

公开(公告)号：ES2298592T3

公开(公告)日：2008-05-16

申请号：ES03776252

申请日：2003-10-07

Applicant: INTERDIGITAL TECH CORP

Inventor： HUNKELER TERESA JOANNE ,  OZLUTURK FATIH

IPC: H04L12/28 ,  H04L12/56 ,  H04W28/24 ,  H04W36/14

Abstract: Una unidad transmisora/receptora inalámbrica (WTRU, 50) configurada para una operación sin interrupciones a través de varios tipos de sistemas de comunicaciones inalámbricas (12, 14, 16, 18), estando dicha WTRU caracterizada porque está dispuesta para traducir los requerimientos de calidad de servicio a través de distintos tipos de sistemas de comunicaciones inalámbricas y porque comprende: al menos una aplicación (52) para realizar un servicio inalámbrico; y al menos una portadora (54) para transmitir, entre las interfaces usuario-red, señales de información del usuario referidas a los requerimientos de calidad de servicio traducidos.

公开(公告)号：AT383726T

公开(公告)日：2008-01-15

申请号：AT03776252

申请日：2003-10-07

Applicant: INTERDIGITAL TECH CORP

Inventor： HUNKELER TERESA ,  OZLUTURK FATIH

IPC: H04L12/28 ,  H04L12/56 ,  H04W28/24 ,  H04W36/14

Abstract: A method and system for mapping quality of service requirements between various types of wireless communication systems is disclosed. The mapping is performed according to the type of systems across which the mapping is being provided.

公开(公告)号：FI20080001A

公开(公告)日：2008-01-02

申请号：FI20080001

申请日：2008-01-02

Applicant: INTERDIGITAL TECH CORP

Inventor： LOMP GARY ,  OZLUTURK FATIH ,  SILVERBERG AVI

IPC: H03K3/84 ,  G06F13/374 ,  H03H17/02 ,  H03H17/06 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/708 ,  H04B1/7085 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/711 ,  H04B1/7115 ,  H04B1/712 ,  H04B7/005 ,  H04B7/216 ,  H04B7/26 ,  H04B15/00 ,  H04B17/00 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10 ,  H04J13/12 ,  H04J13/16 ,  H04K1/00 ,  H04L1/00 ,  H04L5/14 ,  H04L7/00 ,  H04L7/033 ,  H04L25/02 ,  H04L27/00 ,  H04L27/20 ,  H04L27/233 ,  H04L27/30 ,  H04N1/333 ,  H04W52/04 ,  H04W52/14 ,  H04W52/24

Abstract: The invention provides a spread spectrum communication system for maintaining an initial transmit power level of a communication station during periods of inactivity. The system comprises a first station (501) and a second station (502), the initial transmit power level of which is maintained, wherein the first station generates an automatic power control signal by comparing a measured noise power level in a communication channel and an estimated system transmit power level and the second station occasionally transmits a spread spectrum signal whilst in an inactive state and receives the automatic power control signal to adjust an initial transmit power level thereof.