公开(公告)号：DE602006013804D1

公开(公告)日：2010-06-02

申请号：DE602006013804

申请日：2006-03-08

Applicant: QUALCOMM INC

Inventor： WANG MICHAEL MAO ,  LING FUYUN ,  VIJAYAN RAJIV

IPC: H04W52/02 ,  H04B1/16

Abstract: Apparatus and methods for estimating the frequency of a sleep or slow clock by selectively utilizing an estimated sleep clock frequency and an estimated change in the sleep clock frequency. The disclosed apparatus includes a sleep clock frequency estimator to output a fast clock derived sleep clock frequency estimate and a sleep clock change frequency estimator to output an estimate of a change in frequency of the sleep clock. The apparatus further includes a combiner that weights at least one of the fast clock derived sleep clock frequency estimate to obtain a weighted sleep clock frequency estimate and the estimate of the change in frequency of the sleep clock to obtain a weighted estimate of the change in frequency of the sleep clock. The combiner also determines a new estimate of the sleep clock frequency using at least one of the weighted sleep clock frequency estimate and the weighted estimate of the change in frequency of the sleep clock. Complementary methods are also disclosed.

公开(公告)号：AT466424T

公开(公告)日：2010-05-15

申请号：AT06788921

申请日：2006-07-27

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  CHARI MURALI RAMASWAMY ,  VIJAYAN RAJIV ,  MANTRAVADI ASHOK ,  GUPTA ALOK KUMAR ,  MUKKAVILLI KRISHNA KIRAN ,  WANG MICHAEL MAO ,  VRCELJ BOJAN ,  COLLINS BRUCE

IPC: H04L1/00 ,  H04L27/26 ,  H04W88/02 ,  H04W92/10

Abstract: Systems and methods are provided for processing forward link only (FLO) messages. A device for processing forward link only (FLO) wireless messages comprises receiving a FLO message and processing the FLO message including a header, an 8-bit FLO information block field, a 7-bit FLO count, an RF channel identifier, a transmit mode indicator, an outer code rate, and a stream identifier.

公开(公告)号：DE602006012467D1

公开(公告)日：2010-04-08

申请号：DE602006012467

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：MX2010000952A

公开(公告)日：2010-03-10

申请号：MX2010000952

申请日：2008-07-25

Applicant: QUALCOMM INC

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

IPC: H04W48/16

Abstract: Se describen sistemas y metodologías que facilitan el monitoreo de canales RF en un ambiente de comunicación inalámbrico para determinar si uno o más canales comprenden una señal sólo delantera (FLO). Un receptor puede recibir un primer canal RF con la señal FLO y puede monitorear otros canales RE' para las señales FLO. Una vez que se determina que el canal RF monitoreado comprende la señal FLO, el receptor "puede conmutar entre el primer canal RF y el canal RF monitoreado. La detección de señal FLO puede realizarse usando uno o más de un protocolo de detección de energía de canal de identificación de área ancha y un protocolo de detección de error •que decodifica el símbolo de información suplementaria de área ancha.

公开(公告)号：BRPI0609275A2

公开(公告)日：2010-03-09

申请号：BRPI0609275

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： VRCELJ BOJAN ,  MANTRADAVI ASHOK ,  MUKKAVILLI KRISHNA KIRAN ,  LING FUYUN ,  KRISHNAMOORTHI RAGHURAMAN ,  WANG MICHAEL MAO

IPC: H04L27/26 ,  H04L25/02

Abstract: Systems and methods are provided for channel estimation and timing synchronization in a wireless network. In an embodiment, a method is provided for time synchronization at a wireless receiver. The method includes decoding at least one TDM pilot symbol located at a transition between wide and local waveforms and processing the TDM pilot symbol to perform time synchronization for a wireless receiver. Methods for channel estimation at a wireless receiver are also provided. This includes decoding at least one TDM pilot symbol and receiving the TDM pilot symbol from an OFDM broadcast to facilitate channel estimation for a wireless receiver.

公开(公告)号：AT456234T

公开(公告)日：2010-02-15

申请号：AT06737927

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：BRPI0608338A2

公开(公告)日：2009-12-01

申请号：BRPI0608338

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  KRISHNAMOORTHI RAGHURAMAN ,  VRCELJ BOJAN ,  MURTHY VINAY

IPC: H04L27/26

Abstract: A method for synchronizing timing of a receiver to a received orthogonal frequency division multiplexing (OFDM) signal is disclosed. A first timing acquisition is performed with a first received time division multiplexed (TDM) pilot to determine a course timing estimate of the received OFDM signal. A second timing acquisition is performed with a second TDM pilot to determine a fine timing estimate for a OFDM symbol of the received OFDM signal. In the second timing acquisition, the accumulated energy of channel taps over a detection window is determined and a trailing edge of the accumulated energy curve is detected. A Fourier transform (FT) collection window location for subsequent OFDM symbols is adjusted according to the trailing edge information.

公开(公告)号：AU2009202323A1

公开(公告)日：2009-07-02

申请号：AU2009202323

申请日：2009-06-11

Applicant: QUALCOMM INC

Inventor： AGRAWAL AVNEESH ,  LING FUYUN ,  KHANDEKAR AAMOD

IPC: H04L25/03 ,  H04L1/00

Abstract: For an iterative channel and interference estimation and decoding scheme, prior information for channel gain and interference is initially obtained based on received pilot symbols. Forward information for code bits corresponding to received data symbols is derived based on the received data symbols and the prior information and then decoded to obtain feedback information for the code bits corresponding to the received data symbols. A posteriori information for channel gain and interference for each received data symbol is derived based on the feedback information for that received data symbol. The a posteriori information for the received data symbols and the prior information are combined to obtain updated information for channel gain and interference for each received data symbol. The process can be repeated for any number of iterations. The prior, a posteriori, and updated information may be represented by joint probability distributions on channel gain and interference. The forward and feedback information may be represented by log-likelihood ratios.

公开(公告)号：CA2703968A1

公开(公告)日：2009-02-05

申请号：CA2703968

申请日：2008-07-26

Applicant: QUALCOMM INC

Inventor： LING FUYUN ,  CHARI MURALI RAMASWAMY ,  MANTRAVADI ASHOK ,  KRISHNAMOORTHI RAGHURAMAN

IPC: H04L5/00

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：BRPI0513928A

公开(公告)日：2008-05-20

申请号：BRPI0513928

申请日：2005-07-29

Applicant: QUALCOMM INC

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

IPC: H04L1/00

Abstract: A method for improving frequency diversity in an OFDM system using interleaved interlaces for constellation symbol interleaving comprises interleaving a number of subcarriers of an interlace in a bit reversal fashion and interleaving a number of interlaces in the bit reversal fashion.