公开(公告)号：DE69535410D1

公开(公告)日：2007-04-12

申请号：DE69535410

申请日：1995-11-29

Applicant: QUALCOMM INC

Inventor： TIEDEMANN EDWARD G ,  JOU YU-CHEUN ,  WEAVER LINDSAY A ,  BAYLEY GWAIN

IPC: H04L1/00 ,  H04L1/24 ,  H04B3/46 ,  H04B7/26 ,  H04B17/00 ,  H04L1/12 ,  H04L1/20 ,  H04L27/00 ,  H04L69/40

Abstract: The invention provides a system and method for testing signal transmission quality within a digital communication system and may be incorporated within a digital cellular communication system in which information is exchanged over spread spectrum communication channels. A test sequence of digital data transmitted over the communication channel is received at a receiving station, within which is also generated a replica of the test sequence of digital data. The accuracy of transmission over the communication channel is then determined by comparing the replica of the test sequence of digital data to the test sequence of data received over the communication channel. The invention allows the test sequence of digital data to be transmitted at one of a set of known data rates, with the received station being disposed to identify the data rate associated with each test sequence of digital data. In order to simulate the transmission of, for example, voice data, the system may be configured such that each test sequence of digital data is generated in accordance with a pseudorandom process.

公开(公告)号：PT98079B

公开(公告)日：1999-10-29

申请号：PT9807991

申请日：1991-06-24

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  JACOBS IRWIN M ,  PADOVANI ROBERTO ,  WEAVER LINDSAY A ,  WHEATLEY CHARLES E ,  VITERBI ANDREW J

IPC: H04B1/707 ,  H04B1/7075 ,  H04B1/709 ,  H04B1/7115 ,  H04B7/005 ,  H04B7/26 ,  H04J3/02 ,  H04J3/16 ,  H04J3/22 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10 ,  H04J13/18 ,  H04L20060101 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L5/02 ,  H04L5/12 ,  H04L23/02 ,  H04L27/30 ,  H04W52/26 ,  H04B7/00

Abstract: A cell site, comprising: means for modulating configured to format digital data for transmission on a communications channel and to insert at least one timing command into the digital data, the digital data comprising a plurality of bits; means for transmitting coupled to the means for modulating and configured to receive the digital data from the means for modulating, convert the digital data to analog data, and transmit the analog data on the communications channel; and means for receiving configured to receive a signal from at least one remote unit and to determine a timing error of the received signal to be used to generate the timing command in accordance with the timing error, the means for receiving being coupled to the means for modulating and configured to provide the timing command to the means for modulating.

公开(公告)号：BR9609480A

公开(公告)日：1999-09-21

申请号：BR9609480

申请日：1996-06-07

Applicant: QUALCOMM INC

Inventor： BROCK MICHAEL P ,  WEAVER LINDSAY A ,  ROBBINS BARRY R ,  KHATIBI FARROKH

IPC: H04L12/66 ,  H04Q7/24 ,  H04L12/56

Abstract: A fast and efficient packet transmission system and method for transmitting and routing packets through a digital communications network (101, 102, 103, 104, 105 and 106) which utilizes both variable length packets and fixed length packets, or cells, for achieving maximum efficiency and minimum delay in the digital communications network. Network efficiency is maximized by using variable length packets to transmit information across transmission lines (102) and network speed is maximized by using cells to route information to their intended destinations.

公开(公告)号：IN179893B

公开(公告)日：1997-12-27

申请号：IN479MA1991

申请日：1991-06-25

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  JACOBS IRWIN M ,  PADOVANI ROBERTO ,  WEAVER LINDSAY A ,  WHEATLEY CHARLES E ,  VITERBI ANDREW J

IPC: H03B29/00 ,  H04L27/18

公开(公告)号：DE3751232T2

公开(公告)日：1995-08-24

申请号：DE3751232

申请日：1987-10-15

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  JACOBS IRWIN M ,  WEAVER LINDSAY A

IPC: H04J13/00 ,  H04B7/15 ,  H04B7/216 ,  H04B7/26 ,  H04B7/185

公开(公告)号：HU9204111D0

公开(公告)日：1993-03-29

申请号：HU411192

申请日：1991-06-21

Applicant: QUALCOMM INC

Inventor： GILHOUSEN KLEIN S ,  JACOBS IRWIN M ,  PADOVANI ROBERTO ,  WEAVER LINDSAY A ,  WHEATLEY CHARLES E ,  VITERBI ANDREW J

IPC: H04B1/707 ,  H04B1/7075 ,  H04B1/709 ,  H04B1/7115 ,  H04B7/005 ,  H04B7/26 ,  H04J3/02 ,  H04J3/16 ,  H04J3/22 ,  H04J11/00 ,  H04J13/00 ,  H04J13/10 ,  H04J13/18 ,  H04L20060101 ,  H04L1/00 ,  H04L1/06 ,  H04L1/08 ,  H04L5/02 ,  H04L5/12 ,  H04L23/02 ,  H04L27/30 ,  H04W52/26

Abstract: A cell site, comprising: means for modulating configured to format digital data for transmission on a communications channel and to insert at least one timing command into the digital data, the digital data comprising a plurality of bits; means for transmitting coupled to the means for modulating and configured to receive the digital data from the means for modulating, convert the digital data to analog data, and transmit the analog data on the communications channel; and means for receiving configured to receive a signal from at least one remote unit and to determine a timing error of the received signal to be used to generate the timing command in accordance with the timing error, the means for receiving being coupled to the means for modulating and configured to provide the timing command to the means for modulating.

公开(公告)号：NO922212L

公开(公告)日：1992-06-04

申请号：NO922212

申请日：1992-06-04

Applicant: QUALCOMM INC

Inventor： AMES WILLIAM G ,  JACOBS IRWIN M ,  WEAVER LINDSAY A ,  GILHOUSEN KLEIN S

IPC: G01S5/12 ,  G01S5/14 ,  G01S13/87 ,  G01S19/00 ,  G01S19/01 ,  G01S19/38 ,  G01S19/48 ,  H04B7/185 ,  H04B

Abstract: A method and system for determining the position of an object using a fixed station and a plurality of earth orbit satellites whose positions are known. Separate periodic signals are transmitted from the fixed station via first and second satellites to the object whose postion is to be determined. The phase offset in periodic characteristics of the periodic signals as received from the first and second satellites is measured at the object. The phase offset corresponds to a relative time difference in propagation of the signals traveling two different paths to the object. The object transmits via the first satellite a return signal indicative of the measured relative time difference. This return signal is activated some time in the future according to the object local time, which is slaved to receipt of the periodic signal sent through the first satellite. This future time is the start of the particular time period as decided by the fixed station's schedule. At the fixed station, an instantaneous round trip delay, determined by the time offset of the current transmission clock time relative to the receive clock time of reception of the return signal, along with the measured relative time difference sent back on the return signal, is used to calculate the distances between the first and second satellites to the object. From these distances the position of the object is calculated.