公开(公告)号：CA2569455C

公开(公告)日：2013-07-23

申请号：CA2569455

申请日：2005-06-03

Applicant: QUALCOMM INC

Inventor： AGRAWAL AVNEESH ,  MALLADI DURGA P ,  STAMOULIS ANASTASIOS ,  MANTRAVADI ASHOK ,  MURALI RAMASWAMY

IPC: H04W72/04 ,  H04L1/00 ,  H04L5/02 ,  H04L27/26 ,  H04L29/08 ,  H04W80/02 ,  H04W88/10 ,  H04W92/10

Abstract: To transmit overhead information for broadcast and multicast services in a system that utilizes multiple radio technologies, time slots used for OFDM in a super-frame are initially ascertained. Overhead information for multiple streams to be sent in the time slots used for OFDM is generated. The overhead information conveys the time slots and the coding and modulation used for the streams and may be given in various forms. Multiple records may be formed for the overhead information for the streams. The overhead information for the streams is processed and time division multiplexed with the data for the streams in the super-frame. Information indicating the time slots used for OFDM in the super-frame may be sent separately or included in the overhead information. An indicator may also be appended to each stream to indicate whether there is any change in the overhead information for the stream in the next super-frame.

公开(公告)号：CA2699640C

公开(公告)日：2011-07-12

申请号：CA2699640

申请日：2005-04-25

Applicant: QUALCOMM INC

Inventor： VIJAYAN RAJIV ,  MANTRAVADI ASHOK ,  MUKKAVILLI KRISHNA KIRAN

IPC: H04B1/76 ,  H04B7/204 ,  H04B14/08 ,  H04L25/02 ,  H04L27/26

Abstract: To allow a receiving entity to derive a longer channel estimate while limiting overhead, a transmitting entity transmits a pilot on different groups of subbands in different time intervals. N subbands in the system are arranged into M non-overlapping groups. Each group includes subbands that are uniformly distributed across the N subbands. The transmitting entity transmits the pilot on a different subband group in each time interval, and selects all M subband groups in M time intervals based on a pilot staggering pattern. The receiving entity derives (1) an initial impulse response estimate with P channel taps based on the pilot received on one subband group and (2) two longer impulse response estimates with different lengths used for data detection and time tracking. Each longer impulse response estimate may be derived by filtering initial impulse response estimates for a sufficient number of subband groups using a time-domain filter.

公开(公告)号：PL1678866T3

公开(公告)日：2010-12-31

申请号：PL04789175

申请日：2004-09-27

Applicant: QUALCOMM INC

Inventor： MANTRAVADI ASHOK ,  AGRAWAL AVNEESH

IPC: H04L1/00 ,  H04J99/00 ,  H04L5/04 ,  H04L1/06 ,  H04L27/34

公开(公告)号：BRPI0610452A2

公开(公告)日：2010-06-22

申请号：BRPI0610452

申请日：2006-04-07

Applicant: QUALCOMM INC

Inventor： LI LINBO ,  MANTRAVADI ASHOK ,  LING FUYUN ,  MUKKAVILLI KRISHNA KIRAN

IPC: H04L25/02

公开(公告)号：AT466459T

公开(公告)日：2010-05-15

申请号：AT06740615

申请日：2006-04-07

Applicant: QUALCOMM INC

Inventor： MANTRAVADI ASHOK ,  RADHAKRISHNAN DHINAKAR ,  CHARI MURALI RAMASWAMY

IPC: H04W4/06 ,  H04L12/18

Abstract: The disclosure is directed to a mobile communication device that determines when a performance disruption indicates a loss of synchronization with a broadcast signal and, in response, initiates reacquisition of the signal. Reacquisition techniques may include identifying and decoding only select portions of header information in the broadcast signal. Reacquisition may also be initiated in response to one or more deterministic triggers and during a test mode of operation.

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：ES2337827T3

公开(公告)日：2010-04-29

申请号：ES06738060

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： WANG MICHAEL MAO ,  VRCELJ BOJAN ,  MUKKAVILLI KRISHNA KIRAN ,  KRISHNAMOORTHI RAGHURAMAN ,  MANTRAVADI ASHOK

IPC: H04L25/02 ,  H04L5/02

Abstract: Un procedimiento para la multidifusión de información en un sistema de comunicación de múltiples portadoras, que comprende: la generación de un bloque de transmisión; y la inserción de por lo menos un símbolo piloto TDM de Multiplexación por División de Tiempo caracterizado porque el por lo menos un símbolo piloto TDM contiene pilotos de área amplia y de área local y porque se sitúa en una transición entre formas de onda de área amplia y de área local para facilitar la decodificación del bloque de transmisión.

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：BRPI0609235A2

公开(公告)日：2010-03-09

申请号：BRPI0609235

申请日：2006-03-10

Applicant: QUALCOMM INC

Inventor： MUKKAVILLI KRISHNA KIRAN ,  KRISHNAMOORTHI RAGHURAMAN ,  MANTRAVADI ASHOK ,  WANG MICHAEL MAO ,  VRCELJ BOJAN

IPC: H04L25/02 ,  H04L5/02

Abstract: Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.