公开(公告)号：ES2284899T3

公开(公告)日：2007-11-16

申请号：ES02753807

申请日：2002-03-22

Applicant: QUALCOMM INC

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

IPC: H04B7/00 ,  H04J99/00 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04L1/00 ,  H04L27/26

Abstract: Un procedimiento para transmitir datos desde una unidad transmisora a una unidad receptora en un sistema de comunicación de múltiple entrada y múltiple salida (MIMO), que comprende: en la unidad receptora, recibir una pluralidad de señales a través de una pluralidad de antenas de recepción, en la que la señal recibida desde cada antena de recepción comprende una combinación de una o más señales transmitidas desde la unidad transmisora, procesar la señales recibidas para obtener información de estado de canal (CSI) indicativa de características de una pluralidad de canales de transmisión utilizados para la transmisión de datos, y transmitir la CSI de vuelta a la unidad transmisora; y en la unidad transmisora, recibir la CSI desde la unidad receptora, y procesar datos para su transmisión a la unidad receptora basándose en la CSI recibida, caracterizado porque la CSI presentada comprende estimaciones de la relación señal/ruido más interferencia (SNR) para cada uno de la pluralidad de canales de transmisión, y en el que el procesamiento en la unidad transmisora incluye datos de codificación para cada canal de transmisión basándose en la estimación de la SNR para el canal de transmisión.

公开(公告)号：BRPI0413985A

公开(公告)日：2006-11-14

申请号：BRPI0413985

申请日：2004-09-01

Applicant: QUALCOMM INC

Inventor： LING FUNYUN ,  GUPTA ALOK ,  KRISHNAMOORTHI RAGHURAMAN ,  MURALI RAMASWAMY ,  VIJAYAN RAJIV

IPC: H04B3/10 ,  H04J20060101 ,  H04J1/16 ,  H04J11/00

Abstract: In an OFDM system, a transmitter broadcasts a first TDM pilot on a first set of subbands followed by a second TDM pilot on a second set of subbands in each frame. The subbands in each set are selected from among N total subbands such that (1) an OFDM symbol for the first TDM pilot contains at least S1 identical pilot-1 sequences of length L1 and (2) an OFDM symbol for the second TDM pilot contains at least S2 identical pilot-2 sequences of length L2, where L2>L1, S1.L1=N, and S2.L2=N. The transmitter may also broadcast an FDM pilot. A receiver processes the first TDM pilot to obtain frame timing (e.g., by performing correlation between different pilot-1 sequences) and further processes the second TDM pilot to obtain symbol timing (e.g., by detecting for the start of a channel impulse response estimate derived from the second TDM pilot).

公开(公告)号：BR0011050A

公开(公告)日：2006-06-13

申请号：BR0011050

申请日：2000-06-13

Applicant: QUALCOMM INC

Inventor： BONACCORSO MARIO ,  LING FUNYUN ,  HUSHAYANA NAGABHUSHANA ,  BLACK PETER

IPC: H04B1/7117 ,  H04B1/10 ,  H04B1/707 ,  H04B1/709 ,  H04B7/08

Abstract: An optimum combiner that reduces the amount of interference imposed upon a first base station (102) by transmissions of other base stations within the same communication system. Two antennas (112, 114) are used to receive transmissions within a receiving station (110). A rake receiver is coupled to each antenna (112, 114). By optimally combining the signals that are received by each independent finger of the rake receiver, interference that is correlated between a finger associated with the first antenna (112) and a finger associated with the second antenna (114) can be minimized with respect to the desired signal. Optimum combining requires determination of optimum combining coefficients. A max-ratio combining algorithm may be substituted for the optimal combining algorithm depending upon interference characteristics.

公开(公告)号：HK1057949A1

公开(公告)日：2004-04-23

申请号：HK04100690

申请日：2004-02-02

Applicant: QUALCOMM INC

Inventor： BONACCORSO MARIO ,  LING FUNYUN ,  SINDHUSHAYANA NAGABHUSHANA ,  BLACK PETER

IPC: H04B1/7117 ,  H04B1/10 ,  H04B1/707 ,  H04B1/709 ,  H04B7/08 ,  H04B

Abstract: An optimum combiner that reduces the amount of interference imposed upon a first base station (102) by transmissions of other base stations within the same communication system. Two antennas (112, 114) are used to receive transmissions within a receiving station (110). A rake receiver is coupled to each antenna (112, 114). By optimally combining the signals that are received by each independent finger of the rake receiver, interference that is correlated between a finger associated with the first antenna (112) and a finger associated with the second antenna (114) can be minimized with respect to the desired signal. Optimum combining requires determination of optimum combining coefficients. A max-ratio combining algorithm may be substituted for the optimal combining algorithm depending upon interference characteristics.

公开(公告)号：BR0112578A

公开(公告)日：2003-12-30

申请号：BR0112578

申请日：2001-07-17

Applicant: QUALCOMM INC

Inventor： RAZOUMOV LEONID ,  LING FUNYUN ,  LUNDBY STEIN A

IPC: G06F11/10 ,  H03M13/00 ,  H03M13/23 ,  H03M13/25 ,  H04L1/00

Abstract: Techniques for puncturing symbols in a communications system are disclosed. S symbols are received for a frame having a capacity of N symbols, with S being greater than N. P symbols need to be punctured so that remaining symbols fit into the frame. A number of puncture distances, D1 through DN, are computed based on S and P. A particular number of symbol punctures is determined for each computed puncture distance. P1 through PN symbol punctures are then performed at the distances of D1 through DN, respectively. For a more even distribution of the symbol punctures, each of the distances D1 through DN can be selected to be greater than or equal to a minimum puncture distance Dmin defined as Dmin=└S/P┘, where └┘ denotes a floor operator. The symbol punctures at each computed distance can be performed together or distributed with symbol punctures at other distances. In the alternative, an accumulator is configured to wrap around after it has been incremented to a value of S, each increment being of size P. A symbol index is incremented by one each time the accumulator is incremented by P, until the symbol index exceeds the value S. The process is advantageously begun with a puncture. Each time the accumulator wraps around, another puncture is performed. As another alternative, puncturing can be combined with symbol repetition.

公开(公告)号：AU763873B2

公开(公告)日：2003-07-31

申请号：AU1931500

申请日：1999-12-03

Applicant: QUALCOMM INC

Inventor： ROWITCH DOUGLAS N ,  LING FUNYUN

IPC: G06F11/10 ,  H03M13/27 ,  H03M13/29 ,  H04L1/00

Abstract: A turbo code interleaver (100) using linear congruential sequences may be employed as a two-dimensional interleaver (16) in a turbo coder (10) that also includes first and second constituent encoders (12, 14). The interleaver (16) and the first encoder (12) are each configured to receive input bits. The first encoder (12) produces output symbols (22, 24) therefrom. The interleaver (16) receives the input bits (20) sequentially by row. A linear congruential sequence recursion algorithm within the interleaver (16) serves to pseudo-randomly rearrange, or shuffle, the bits within each row of the interleaver (16). The bits (26) are then output from the interleaver sequentially by column. The second encoder (14) is configured to receive the interleaved bits from the interleaver. The second encoder (14) produces output symbols (28) therefrom.; The two streams of output symbols (22, 24) are multiplexed together, with appropriate puncturing. If desired, the linear congruential recursion sequence can be generated in reverse. Also if desired, a bit reversal technique can be used in the interleaver (16) to rearrange, or shuffle, the rows of the interleaver (16).

公开(公告)号：BR0010474A

公开(公告)日：2002-12-31

申请号：BR0010474

申请日：2000-05-09

Applicant: QUALCOMM INC

Inventor： LING FUNYUN ,  HOLTZMAN JACK ,  WHEATLEY CHARLES E III ,  CHEN TAO ,  TIEDEMANN EDWARD G ,  LEUNG GILBERT

IPC: H04B7/005 ,  H04B7/26 ,  H04W36/08 ,  H04W52/22 ,  H04W52/40 ,  H04W52/42 ,  H04Q7/38

Abstract: A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.

公开(公告)号：AU2002259221A1

公开(公告)日：2002-11-25

申请号：AU2002259221

申请日：2002-05-17

Applicant: QUALCOMM INC

Inventor： LING FUNYUN ,  KETCHUM JOHN W ,  WALTON JAY ROD ,  WALLACE MARK S ,  HOWARD STEVEN J

IPC: H04J99/00 ,  H04B7/005 ,  H04B7/04 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04L1/00 ,  H04L1/06 ,  H04L5/06 ,  H04L25/03 ,  H04L27/26

Abstract: Techniques are provided to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbols and pre-weighting the modulation symbols for each selected channel based on the channel's characteristics. The pre-weighting may be achieved by "inverting" the selected channels so that the received SNRs are approximately similar for all selected channels. With selective channel inversion, only channels having SNRs at or above a particular threshold are selected, "bad" channels are not used, and the total available transmit power is distributed across only "good" channels. Inproved performance is achieved due to the combined benefits of using only the best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

公开(公告)号：HK1045229A1

公开(公告)日：2002-11-15

申请号：HK02106623

申请日：2002-09-09

Applicant: QUALCOMM INC

Inventor： LING FUNYUN ,  PETER BLACK J ,  KENNETH EASTON D

IPC: H04B1/7075 ,  H04B1/707 ,  H04L20090101 ,  H04B1/709 ,  H04L27/00 ,  H04L27/233

Abstract: Coherent detection of high-speed digital wireless communications becomes more difficult when the frequencies of the transmitter and receiver oscillators do not coincide. A frequency-locked loop may be used to characterize this frequency offset by processing the samples received on a pilot channel. Rather than using the offset information thus derived to correct the frequency of the received signal, the invention realizes a considerable computational savings by applying a frequency correction to the despread pilot samples instead.

公开(公告)号：BR0012996A

公开(公告)日：2002-06-18

申请号：BR0012996

申请日：2000-08-03

Applicant: QUALCOMM INC

Inventor： LING FUNYUN ,  BLACK PETER J

IPC: H04B7/005 ,  H04B7/26 ,  H04W52/12 ,  H04W52/20 ,  H04W52/22 ,  H04W52/28 ,  H04W52/42

Abstract: According to one aspect of the invention, a method for determining a power control set point is provided. In one embodiment, the power control set point is determined based on one or more factors including a first factor corresponding to a pilot bit error rate, a second factor corresponding to a normalized signal variance, and a third factor corresponding to an average number of fingers in lock.