公开(公告)号：AU2004302856B2

公开(公告)日：2010-04-29

申请号：AU2004302856

申请日：2004-09-02

Applicant: QUALCOMM INC

Inventor： WALKER KENT ,  KHANDEKAR AAMOD ,  VIJAYAN RAJIV ,  LING FUYUN ,  MURALI RAMASWAMY

IPC: H04J11/00 ,  H04B7/00 ,  H04H20/00 ,  H04J3/24 ,  H04L1/00 ,  H04L5/02 ,  H04L5/06 ,  H04L12/28 ,  H04L25/02 ,  H04L27/26 ,  H04W4/06 ,  H04W28/06 ,  H04W72/00 ,  H04W72/04

Abstract: Techniques for multiplexing and transmitting multiple data streams are described. Transmission of the multiple data streams occurs in “super-frames”. Each super-frame has a predetermined time duration and is further divided into multiple (e.g., four) frames. Each data block for each data stream is outer encoded to generate a corresponding code block. Each code block is partitioned into multiple subblocks, and each data packet in each code block is inner encoded and modulated to generate modulation symbols for the packet. The multiple subblocks for each code block are transmitted in the multiple frames of the same super-frame, one subblock per frame. Each data stream is allocated a number of transmission units in each super-frame and is assigned specific transmission units to achieve efficient packing. A wireless device can select and receive individual data streams.

公开(公告)号：AT460037T

公开(公告)日：2010-03-15

申请号：AT06737928

申请日：2006-03-09

Applicant: QUALCOMM INC

Inventor： VRCELJ BOJAN ,  MANTRAVADI ASHOK ,  LING FUYUN ,  VIJAYAN RAJIV ,  WANG MICHAEL

IPC: H04L27/26

Abstract: A method for positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.

公开(公告)号：DE602006011869D1

公开(公告)日：2010-03-11

申请号：DE602006011869

申请日：2006-03-09

Applicant: QUALCOMM INC

Inventor： VRCELJ BOJAN ,  MANTRAVADI ASHOK ,  LING FUYUN ,  VIJAYAN RAJIV ,  WANG MICHAEL MAO

IPC: H04L27/26

Abstract: A method for positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.

公开(公告)号：BRPI0609270A2

公开(公告)日：2010-03-09

申请号：BRPI0609270

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： VRCELJ BOJAN ,  LING FUYUN ,  MUKKAVILLI KIRAN ,  MANTRAVADI ASHOK

IPC: H04L25/02 ,  H04L27/26

Abstract: Systems and methods are provided for determining and applying timing corrections in a digital communications system. In an aspect, a timing correction method is provided for a multi-carrier system. This includes aligning two or more symbols with respect to each other from a symbol subset in order to account for timing differences between the symbols. The symbol alignment is first carried out to generate channel estimates for data demodulation. The channel estimates, thus generated, along with the timing alignment information are in turn used for determining timing corrections-to be applied to future symbols.

公开(公告)号：SG155171A1

公开(公告)日：2009-09-30

申请号：SG2009050899

申请日：2005-07-29

Applicant: QUALCOMM INC

Inventor： WANG MICHAEL MAO ,  LING FUYUN ,  MURALI RAMASWAMY ,  VIJAYAN RAJIV

Abstract: A system and method for frequency diversity uses interleaving. Subcarriers of an interlace are interleaved in a bit reversal fashion and the interlaces are interleaved in the bit reversal fashion.

公开(公告)号：AU2005208658B2

公开(公告)日：2009-02-05

申请号：AU2005208658

申请日：2005-01-20

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  GORE DHANANJAY ASHOK ,  KRISHNANMOORTHI RAGHURAMAN ,  MUKKAVILLI KIRAN ,  MANTRAVADI ASHOK

IPC: H04L25/02 ,  H04L27/26

Abstract: Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, time filtering is utilized. Time filtering is utilized to combat excess delay spread effects in channel estimation. The time filtering is performed in the presence of staggered pilots and helps in improving the channel estimate in the presence of excess delay spread.

公开(公告)号：CA2703967A1

公开(公告)日：2009-01-29

申请号：CA2703967

申请日：2008-07-25

Applicant: QUALCOMM INC

Inventor： MANTRAVADI ASHOK ,  CHARI MURALI RAMASWAMY ,  WANG MICHAEL ,  LING FUYUN ,  VIJAYAN RAJIV ,  KRISHNAMOORTHI RAGHURAMAN

IPC: H04L27/26 ,  H03M13/27 ,  H04L1/00 ,  H04L5/02

Abstract: A system and method for frequency diversity uses interleaving in a wireless communication system utilizing orthogonal frequency division multiplexing (OFDM) with various FFT sizes. Subcarriers of one or more interlaces are interleaved in a bit reversal fashion and the one or more interlaces are interleaved.

公开(公告)号：AU2008279021A1

公开(公告)日：2009-01-29

申请号：AU2008279021

申请日：2008-07-25

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  KRISHNAMOORTHI RAGHURAMAN ,  LI LINBO ,  MANTRAVADI ASHOK

IPC: H04W36/28 ,  H04W36/30 ,  H04W72/00

公开(公告)号：AT402526T

公开(公告)日：2008-08-15

申请号：AT00967131

申请日：2000-09-29

Applicant: QUALCOMM INC

Inventor： CHEN TAO ,  LING FUYUN ,  HOLTZMAN JACK ,  JOU YU-CHEUN ,  LUNDBY STEIN

IPC: H04B7/02 ,  H04J99/00 ,  H01Q1/24 ,  H01Q3/26 ,  H04B7/04 ,  H04B7/06 ,  H04B7/08 ,  H04B7/26

Abstract: A method and apparatus for wireless communications wherein a base station transmits a signal to sending data to a subscriber station through a signal beam that sweeps through the coverage area of the base station. User data addressed to the subscriber station is buffered until the signal beam angle of the signal beam allows efficient transmission. The base station may alter the beam sweep speed or the shape of the beam's radiation pattern over time to maximize system efficiency and capacity.

公开(公告)号：AR060918A1

公开(公告)日：2008-07-23

申请号：ARP070102071

申请日：2007-05-14

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  SUN THOMAS ,  KRISHNAMOORTHI RAGHURAMAN ,  VAN VEEN DURK L ,  CHARI MURALI RAMASWAMY

IPC: H03M13/00

Abstract: Estimacion de la varianza del ruido asociada con un transmisor. Por ejemplo, la varianza del ruido puede ser estimada en conexion con la determinacion de los parámetros de eficiencia asociados con un transmisor. La determinacion de la varianza del ruido puede incluir los actos de la estimacion de la alteracion de la fase de una senal recibida por medio de la utilizacion de un algoritmo de estimacion, basado en los cuadrados mínimos. La determinacion de la varianza del ruido también puede incluir el acto de determinar una estimacion imparcial de la varianza del ruido como una funcion de la alteracion estimada de la fase.