-
公开(公告)号：ES2287282T3
公开(公告)日：2007-12-16
申请号：ES02737005
申请日：2002-05-15
Applicant: QUALCOMM INC
Inventor： WALTON JAY R , WALLACE MARK , HOWARD STEVEN J
Abstract: Un procedimiento para planificar la transmisión de datos de enlace descendente hacia una pluralidad de terminales (106) para un sistema (100) de comunicación inalámbrica, comprendiendo el sistema: formar uno o más juegos de terminales para posible transmisión de datos, en el cual cada juego incluye una combinación de uno o más terminales (106) y se corresponden con una hipótesis a evaluar; asignar una pluralidad de antenas (524) de transmisión a uno o más terminales (106) en cada juego; evaluar el rendimiento de cada hipótesis en función de parte de las asignaciones de antena para la hipótesis, en el cual cada hipótesis se evalúa en función de la información del estado del canal, en adelante CSI, para cada terminal (106) en la hipótesis, en el cual la CSI es indicadora de las características del canal entre las antenas (524) de transmisión y el terminal (106) seleccionar una de entre las una o más hipótesis evaluadas en función del rendimiento; y planificar transmisión de datos hasta el o los terminales (106) en la hipótesis seleccionada; y el procedimiento caracterizado por: priorizar la planificación de terminales (106).
-
公开(公告)号：CA2777497A1
公开(公告)日：2007-11-29
申请号：CA2777497
申请日：2007-05-22
Applicant: QUALCOMM INC
Inventor： WALLACE MARK S , KETCHUM JOHN W , WALTON JAY RODNEY , HOWARD STEVEN J
Abstract: Techniques for performing acquisition of packets are described. First detection values may be determined based on a first plurality of samples, e.g., by performing delay-multiply-integrate on the samples. Power values may be determined based on the first plurality of samples, e.g., by performing multiply-integrate on the samples. The first detection values may be averaged to obtain average detection values. The power values may also be averaged to obtain average power values. Whether a packet is presence may be determined based on the average detection values and the average power values. Second detection values may be determined based on a second plurality of samples. The start of the packet may be determined based on the first and second detection values. A third detection value may be determined based on a third plurality of samples. Frequency error of the packet may be estimated based on the first and third detection values.
-
公开(公告)号：CA2650783A1
公开(公告)日：2007-11-29
申请号：CA2650783
申请日：2007-05-22
Applicant: QUALCOMM INC
Inventor： HOWARD STEVEN J , WALTON JAY RODNEY , KETCHUM JOHN W , WALLACE MARK S
IPC: H04L27/26
Abstract: Techniques for performing acquisition of packets are described. First det ection values may be determined based on a first plurality of samples, e.g., by performing delay-multiply-integrate on the samples. Power values may be determined based on the first plurality of samples, e.g., by performing mult iply-integrate on the samples. The first detection values may be averaged to obtain average detection values. The power values may also be averaged to o btain average power values. Whether a packet is presence may be determined b ased on the average detection values and the average power values. Second de tection values may be determined based on a second plurality of samples. The start of the packet may be determined based on the first and second detecti on values. A third detection value may be determined based on a third plural ity of samples. Frequency error of the packet may be estimated based on the first and third detection values.
-
公开(公告)号：CA2650431A1
公开(公告)日：2007-11-29
申请号：CA2650431
申请日：2007-05-22
Applicant: QUALCOMM INC
Inventor： WALTON J RODNEY , WALLACE MARK S , HOWARD STEVEN J , MEDVEDEV IRINA
-
85.发明专利
公开(公告)号：AU2002303737B2
公开(公告)日：2007-11-01
申请号：AU2002303737
申请日：2002-05-14
Applicant: QUALCOMM INC
Inventor： WALLACE MARK S , HOWARD STEVEN J , WALTON JAY ROD
Abstract: Techniques to schedule uplink data transmission for a number of terminals in a wireless communication system. In one method, a number of sets of terminals are formed for possible data transmission, with each set including a unique combination of terminals and corresponds to a hypothesis to be evaluated. The performance of each hypothesis is evaluated (e.g., based on channel response estimates for each terminal) and one of the evaluated hypotheses is selected based on the performance. The terminals in the selected hypothesis are scheduled for data transmission. A successive cancellation receiver processing scheme may be used to process the signals transmitted by the scheduled terminals. In this case, one or more orderings of the terminals in each set may be formed, with each terminal ordering corresponding to a sub-hypothesis to be evaluated. The performance of each sub-hypothesis is then evaluated and one of the sub-hypothcses is selected.
-
Patent Agency Ranking
公开(公告)号：CA2762126A1
公开(公告)日：2007-07-19
申请号：CA2762126
申请日：2007-01-10
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , WALLACE MARK S , HOWARD STEVEN J
IPC: H04L27/00
Abstract: Techniques for performing sphere detection to recover data symbols sent in a MIMO transmission are described. In an aspect, sphere detection is performed for data symbols generated with at least two modulation schemes. In another aspect, sphere detection is performed for the data symbols in an order determined based on at least one attribute of the data symbols, which may be error probabilities, modulation schemes, and/or link margins for the data symbols. In yet another aspect, rates for multiple data streams detected with sphere detection are selected based on channel state information. Signal qualities of the data streams may be estimated based on the channel state information, e.g., (1) an upper triangular matrix used for sphere detection and/or (2) an assumption that interference from data streams already detected is canceled. The rates for the data streams may be selected based on the estimated signal qualities.
-
公开(公告)号：AT360288T
公开(公告)日：2007-05-15
申请号：AT02753807
申请日：2002-03-22
Applicant: QUALCOMM INC
Inventor： LING FUNYUN , WALTON JAY R , HOWARD STEVEN J , WALLACE MARK , KETCHUM JOHN W
Abstract: Techniques for transmitting data from a transmitter unit to a receiver unit in a multiple-input mutiple-output (MIMO) communication system. In one method, at the receiver unit, a number of signals are received via a number of receive antennas, with the received signal from the transmitter unit. The received signals are processed to derive channel state information (CSI) indicative of characteristics of a number of transmission channels used for data transmission. The CSI is transmitted back to the transmitter unit. At the transmitter unit, the CSI from the receiver unit is received and data for transmission to the receiver units is processed based on the received CSI.
-
88.发明专利
公开(公告)号：MXPA06012835A
公开(公告)日：2007-03-01
申请号：MXPA06012835
申请日：2005-04-29
Applicant: QUALCOMM INC
Inventor： HOWARD STEVEN J , WALTON JAY RODNEY , LUNDBY STEIN A
Abstract: Una entidad transmisora utilizas diferentes vectores de direccion para diferentes sub-bandas a fin de lograr la diversidad de direccion; cada vector de direccion define o forma un haz para una sub-banda asociada; se puede utilizar cualquier vector de direccion para la diversidad de direccion; los vectores de direccion se pueden definir de manera que los haces varien en una forma continua en lugar de una forma abrupta a traves de las sub-bandas para cada antena de transmision; como un ejemplo, los desplazamientos de fase se pueden cambiar en una forma lineal a traves de las sub-bandas para cada antena de transmision, y cada antena se puede asociar con una inclinacion de fase diferente; la aplicacion de desplazamientos de fase linealmente cambiantes para simbolos de modulacion en el dominio de frecuencia se puede lograr retrasando o desplazando circularmente las muestras de dominio de tiempo correspondientes.
-
公开(公告)号：CA2612342A1
公开(公告)日：2006-12-28
申请号：CA2612342
申请日：2006-06-07
Applicant: QUALCOMM INC
Inventor： WALTON JAY RODNEY , WALLACE MARK S , KETCHUM JOHN W , MONSEN PETER , HOWARD STEVEN J
Abstract: Techniques to efficiently derive a spatial filter matrix are described. In a first scheme, a Hermitian matrix is iteratively derived based on a channel response matrix, and a matrix inversion is indirectly calculated by deriving the Hermitian matrix iteratively. The spatial filter matrix is derived based on the Hermitian matrix and the channel response matrix. In a second scheme, multiple rotations are performed to iteratively obtain first and second matrices for a pseudo-inverse matrix of the channel response matrix. The spatial filter matrix is derived based on the first and second matrices. In a third scheme, a matrix is formed based on the channel response matrix and decomposed to obtain a unitary matrix and a diagonal matrix. The spatial filter matrix is derived based on the unitary matrix, the diagonal matrix, a nd the channel response matrix.
-
公开(公告)号：HK1086125A1
公开(公告)日：2006-09-08
申请号：HK06104070
申请日：2006-04-03
Applicant: QUALCOMM INC
Inventor： WALTON J RODNEY , WALLACE MARK S , KETCHUM JOHN W , HOWARD STEVEN J
IPC: H04B7/005 , H04B7/06 , H04B7/08 , H04J99/00 , H04L20090101 , H04L1/00 , H04L1/06 , H04L1/08 , H04L1/16 , H04L1/18 , H04L12/28 , H04L12/56 , H04L25/02 , H04L25/03 , H04L27/00 , H04L27/26 , H04W28/06 , H04W28/20 , H04W28/22 , H04W52/00 , H04W52/42 , H04W52/50 , H04W72/04 , H04W72/12 , H04W74/00 , H04W74/08 , H04W84/12
Abstract: A multiple-access MIMO WLAN system that employs MIMO, OFDM, and TDD. The system (1) uses a channel structure with a number of configurable transport channels, (2) supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities, (3) employs a pilot structure with several types of pilot (e.g., beacon, MIMO, steered reference, and carrier pilots) for different functions, (4) implements rate, timing, and power control loops for proper system operation, and (5) employs random access for system access by the user terminals, fast acknowledgement, and quick resource assignments. Calibration may be performed to account for differences in the frequency responses of transmit/receive chains at the access point and user terminals. The spatial processing may then be simplified by taking advantage of the reciprocal nature of the downlink and uplink and the calibration.
-
-
-
-
-
-
-
-
-
Search Results
437
records
(took 0.026 seconds)
