公开(公告)号：EP1989913A2

公开(公告)日：2008-11-12

申请号：EP07757837.5

申请日：2007-03-02

Applicant: QUALCOMM Incorporated

Inventor： LEE, Chong, U. ,  STEIN, Jeremy, M. ,  SHEYNBLAT, Leonid

IPC: H04Q7/38 ,  G01S5/00 ,  G01S5/14 ,  G01S5/02

CPC classification number: G01S5/06 ,  G01S5/0081 ,  G01S5/0221 ,  G01S5/0226 ,  G01S5/0289 ,  G01S5/14 ,  G01S13/74 ,  G01S13/876 ,  G01S19/46 ,  G01S2205/008 ,  H04W64/00 ,  H04W84/18

Abstract: For position determination with peer-to-peer communication, a target terminal (120a) broadcasts a request for assistance in determining its position (1). At least one ranging terminal (120b, 120c, 12On) receives the request. Each ranging terminal (120b, 120c, 12On) sends a response with a time of arrival (TOA) measurement for the request and the position of the ranging terminal (3). For two-way peer-to-peer, the target terminal receives at least one response from the at least one ranging terminal, obtains a TOA measurement for each response, estimates the distance to each ranging terminal based on the TOA measurement for the request and/or the TOA measurement for the response, and computes a position estimate for itself based on the estimated distance and the position for each ranging terminal (4). For one-way peer-to-peer, a network entity receives at least one response from the at least one ranging terminal, computes a position estimate for the target terminal, and sends the position estimate to the target terminal.

公开(公告)号：EP0931417A1

公开(公告)日：1999-07-28

申请号：EP97910970.0

申请日：1997-10-09

Applicant: QUALCOMM INCORPORATED

Inventor： PIAN, Donald, T. ,  LEE, Chong, U.

IPC: G06T9 ,  H04N7

CPC classification number: H04N19/152 ,  H04N19/115 ,  H04N19/126 ,  H04N19/146 ,  H04N19/149 ,  H04N19/15 ,  H04N19/176 ,  H04N19/186 ,  H04N19/60 ,  H04N19/61

Abstract: A system and method for adaptively controlling the encoded data rate in a data compression system. The system and method sets up alternative encoded bit streams for each segment of data and selects the alternative that would produce the bit rate closest to a predetermined target bit rate for transmission. Each segment of the video input is quantized by a set of quantizers (20a-20c) to produce a plurality of quantized segments. Each quantized segment is variable rate encoded by a variable-length encoder (22a-22c) based on a quantization index to produce an alternative encoded bit stream. A set of rate measurers (24a-24c) measure the data rate that would be required to transmit each alternative encoded bit stream, and comparator (30) compares the measured rates with a predetermined target bit rate. The encoded bit stream having a rate closest to the target bit rate is provided to a rate buffer (34) in preparation for transmission. Having processed one segment of data, the system and method then updates its parameters for processing the next segment of data. A target bit rate update element (38) determines an updated target bit rate based on the rate buffer status. In addition, a quantization index update element (36) generates new quantization indices for processing the next segment of data.

公开(公告)号：EP0517834B1

公开(公告)日：1998-09-16

申请号：EP91906206.7

申请日：1991-02-26

Applicant: QUALCOMM INCORPORATED

Inventor： LEE, Chong, U.

IPC: H04N7/26 ,  H04N7/32 ,  H04N7/50 ,  H04N1/415 ,  G06K9/36

CPC classification number: H04N19/00 ,  G06T9/40 ,  H04N19/119 ,  H04N19/129 ,  H04N19/13 ,  H04N19/146 ,  H04N19/15 ,  H04N19/154 ,  H04N19/172 ,  H04N19/176 ,  H04N19/18 ,  H04N19/60 ,  H04N19/91 ,  H04N19/96 ,  H04N19/98