中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

191 records (took 0.025 seconds)

    HIGH EFFICIENCY, HIGH PERFORMANCE COMMUNICATIONS SYSTEM EMPLOYING MULTI-CARRIER MODULATION
    81.
    发明专利
    HIGH EFFICIENCY, HIGH PERFORMANCE COMMUNICATIONS SYSTEM EMPLOYING MULTI-CARRIER MODULATION 未知

    公开(公告)号：CA2402011A1

    公开(公告)日：2001-09-27

    申请号：CA2402011

    申请日：2001-03-20

    Applicant: QUALCOMM INC

    Inventor： WALTON JAY R ,  WALLACE MARK ,  JALALI AHMAD

    IPC: H04J11/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04Q7/38

    Abstract: Transmitter and receiver units for use in a communications system and configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals. The transmitter unit includes a system data processor, one or more modulators, and one or more antennas. The system data processor receives and partitions an input data stream into a number of channel data streams and further processes the channel data streams to generate one or more modulation symbol vector streams. Each modulation symbol vector stream includes a sequence of modulation symbol vectors representative of data in one or more channel data streams. Each modulator receives and modulates a respective modulation symbol vector stream to provide an RF modulated signal, and each antenna receives and transmits a respective RF modulated signal. Each modulator may include an inverse (fast) Fourier transform (IFFT) and a cyclic prefix generator. The IFFT generates time-domain representations of the modulation symbol vectors, and the cyclic prefix generator repeats a portion of the time-domain representation of each modulation symbol vector. The channel data streams are modulated using multi-carrier modulation, e.g., OFDM modulation. Time division multiplexing (TDM) may also be used to increase flexibility.

    METHODS AND APPARATUSES FOR FAST POWER CONTROL OF SIGNALS TRANSMITTED ON A MULTIPLE ACCESS CHANNEL
    82.
    发明专利
    METHODS AND APPARATUSES FOR FAST POWER CONTROL OF SIGNALS TRANSMITTED ON A MULTIPLE ACCESS CHANNEL 未知

    公开(公告)号：CA2346060A1

    公开(公告)日：2000-04-13

    申请号：CA2346060

    申请日：1999-10-01

    Applicant: QUALCOMM INC

    Inventor： HOWARD STEVEN J ,  KETCHUM JOHN W ,  WALLACE MARK S ,  WALTON JAY R

    IPC: H04L12/28 ,  H04B7/005 ,  H04B7/26 ,  H04W52/50 ,  H04W72/14 ,  H04Q7/38

    Abstract: A method and apparatus for controlling the transmission of signals from one or more of a plurality of mobile stations (1300) to a base station (1400) on a plurality of M multiple access channels. A power control information packet formed from a plurality of power control bits is transmitted from the base station (1400) to the one or more mobile stations (1300). Each of the power control bits in the power control information packet has a position that is mapped to a selected access channel and to a time offset within the selected access channel. The power control information packet is received at a first mobile station (1300). A message is then transmitted from the first mobile station (1300) to the base station (1400) on a first access channel and at a first time offset associated with the first access channel. The message is transmitted from the first mobile station (1300) at a power level determined in response to a first power control bit in the power control information packet. The first power control bit is located in a first position in the power control information packet, the first position being mapped to the fir st access channel and the first time offset.

    Procedimiento y aparato de asignación de recursos en un sistema de comunicación de múltiples entradas y múltiples salidas (MIMO)
    84.
    发明专利
    Procedimiento y aparato de asignación de recursos en un sistema de comunicación de múltiples entradas y múltiples salidas (MIMO) 未知

    公开(公告)号：ES2436766T3

    公开(公告)日：2014-01-07

    申请号：ES07011912

    申请日：2002-05-15

    Applicant: QUALCOMM INC

    Inventor： WALTON JAY R ,  WALLACE MARK ,  HOWARD STEVEN J

    IPC: H04L1/06 ,  H04B7/04 ,  H04B7/06 ,  H04J99/00 ,  H04L1/00 ,  H04W16/00 ,  H04W16/28 ,  H04W84/14

    Abstract: Un procedimiento de planificación de la transmisión de datos en un sistema (100) de comunicación inalámbrica, estando el procedimiento implementado por una estación base (104), y comprendiendo el procedimiento: formar múltiples conjuntos de terminales (106) para recibir la transmisión de datos desde la estación base (104) en un próximo intervalo de transmisión, incluyendo cada conjunto uno o más terminales (106), y correspondiendo a una hipótesis distinta, a evaluar en base a uno o más criterios, en donde los múltiplesconjuntos de terminales (106) incluyen un primer conjunto de uno o más terminales (106) correspondientes auna primera hipótesis a evaluar, y un segundo conjunto de uno o más terminales (106) correspondientes a unasegunda hipótesis a evaluar, y en donde dichos uno o más terminales (106) en el primer conjunto son distintos adichos uno o más terminales (106) en el segundo conjunto; asignar una pluralidad de antenas (524) de transmisión a dichos uno o más terminales (106) en cada conjunto;evaluar el rendimiento de cada hipótesis en base a la información de estado de canal, CSI, asociada a cadaterminal (106), siendo la CSI indicativa de las características de canal entre el respectivo terminal (106) y lascorrespondientes antenas transmisoras (524); seleccionar una de las múltiples hipótesis evaluadas, en base al rendimiento; y planificar la transmisión de datos a dichos uno o más terminales (106) en la hipótesis seleccionada.

    METHOD AND APPARATUS FOR PROCESSING DATA IN A MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM UTILIZING CHANNEL STATE INFORMATION
    86.
    发明专利
    METHOD AND APPARATUS FOR PROCESSING DATA IN A MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM UTILIZING CHANNEL STATE INFORMATION 未知

    公开(公告)号：CA2446512C

    公开(公告)日：2012-03-13

    申请号：CA2446512

    申请日：2002-05-07

    Applicant: QUALCOMM INC

    Inventor： WALTON JAY R ,  WALLACE MARK ,  KETCHUM JOHN W ,  HOWARD STEVEN J

    IPC: H04B7/08 ,  H04J99/00 ,  H04B7/06 ,  H04B7/12 ,  H04L1/00 ,  H04L1/06

    Abstract: Techniques to "successively" process received signals at a receiver unit in a MIMO system to recover transmitted data, and to "adaptively" process data at a transmitter unit based on channel state information available for the MIMO channel. A successive cancellation receiver processing technique is used to process the received signals and performs a number of iterations to provide decoded data streams. For each iteration, input (e.g., received) signals for the iteration are processed to provide one or more symbol streams. One of the symbol streams is selected and processed to provide a decoded data stream. The interference due to the decoded data stream is approximately removed (i.e., canceled) from the input signals provided to the next iteration. The channel characteristics are estimated and reported back to the transmitter system and used to adjust (i.e., adapt) the processing (e.g., coding, modulation, and so on) of data prior to transmission.

    87.
    发明专利
    未知

    公开(公告)号：AT534198T

    公开(公告)日：2011-12-15

    申请号：AT05015739

    申请日：2001-03-20

    Applicant: QUALCOMM INC

    Inventor： WALLACE MARK ,  WALTON JAY R ,  JALALI AHMAD

    IPC: H04B7/00 ,  H04J11/00 ,  H04B1/707 ,  H04B7/06 ,  H04B7/08 ,  H04B7/12 ,  H04B7/26 ,  H04B17/00 ,  H04J99/00 ,  H04L25/02 ,  H04L27/26 ,  H04W52/08 ,  H04W52/42

    Abstract: The invention relates to a method for transmitting pilot signals used for measuring and reporting channel state information, CSI, in a multiple input/multiple output, MIMO, system, comprising: generating a pilot sequence by using a maximal-length shift register sequence, m-sequence; assigning a different shift to multiple transmit antennas, wherein the value of the shift is dependent on at least one characteristic of the communication channel; generating a pilot signal at each transmit antenna by shifting the pilot sequence by the value specified by the shift; and transmitting the pilot signal via the transmit antenna.

    89.
    发明专利
    未知

    公开(公告)号：AT450094T

    公开(公告)日：2009-12-15

    申请号：AT03761175

    申请日：2003-06-20

    Applicant: QUALCOMM INC

    Inventor： KETCHUM JOHN W ,  WALTON JAY R

    IPC: H04J99/00 ,  H04L1/06 ,  H04B7/04 ,  H04L1/00 ,  H04L25/02 ,  H04L25/03

    Abstract: Techniques for processing a data transmission at a transmitter and receiver, which use channel eigen-decomposition, channel inversion, and (optionally) 'water-pouring'. At the transmitter, (1) channel eigen-decomposition is performed to determine eigenmodes of a MIMO channel and to derive a first set of steering vectors, (2) channel inversion is performed to derive weights ( e . g ., one set for each eigenmode) used to minimize ISI distortion, and (3) water-pouring may be performed to derive scaling values indicative of the transmit powers allocated to the eigenmodes. The first set of steering vectors, weights, and scaling values are used to derive a pulse-shaping matrix, which is used to precondition modulation symbols prior to transmission. At the receiver, channel eigen-decomposition is performed to derive a second set of steering vectors, which are used to derive a pulse-shaping matrix used to condition received symbols such that orthogonal symbol streams are recovered.

Patent Agency Ranking