公开(公告)号：CA2310368C

公开(公告)日：2003-12-02

申请号：CA2310368

申请日：2000-05-31

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SARRAF MOHSEN ,  TOBIAS JONATHAN MICHAEL ,  TSAI SHENG-JEN ,  MATUSEVICH ALEX ,  GOEDDEL THOMAS WILLIAM

IPC: H04L27/18 ,  H04L7/033 ,  H04L27/22

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phase- modulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.

公开(公告)号：AU5359900A

公开(公告)日：2001-03-08

申请号：AU5359900

申请日：2000-08-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ANDERSON CARL RICHARD ,  HANSON KATHRYN W ,  MATUSEVICH ALEX ,  RAUSCHER MARY ELLEN ,  TOBIAS JONATHAN MICHAEL

IPC: H04J3/00 ,  H04B7/26 ,  H04W36/32 ,  H04Q7/22

Abstract: A system for performing a handoff of a wireless unit uses location information for the wireless unit to determine whether to handoff the wireless unit and/or to which base station to handoff the wireless unit. For example, a wireless unit can have a location system, such as a global positioning system (GPS), which determines the location of the wireless unit. The wireless unit can obtain location information for the wireless unit and provide the location information to the serving base station. From the location information, the serving base station can determine that the wireless unit is leaving the coverage area of the serving base station and may need to be handed off. The serving base station then can send at least a portion of the location information to the MSC, and the MSC can determine to which base station the wireless unit is handed off to based on the location information. Alternatively, the serving base station can determine to which base station the wireless unit is to be handed off.

公开(公告)号：CA2313814A1

公开(公告)日：2001-01-26

申请号：CA2313814

申请日：2000-07-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： WANG ROBERT CHUENLIN ,  TOBIAS JONATHAN MICHAEL ,  MATUSEVICH ALEX ,  TSAI SHENG-JEN ,  GORDON ALEXANDER

IPC: H04L27/22 ,  G01S1/04 ,  G01S5/10 ,  H04B7/26 ,  H04J3/00 ,  H04L27/14 ,  H04Q7/34

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signa l in a wireless communication system is demodulated by frequency demodulating the phase-modulated signal. The phase-modulated signal is a separated into first and second copies, the first copy is phase demodulated to generate demodulated symbols, and the second copy is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of t he phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to generate event signa ls having signature properties (signature events). These signature events are used in traditiona l Time Difference of Arrival tdoa algorithms to accurately determine position of a mobile unit in the wireless communication system.

公开(公告)号：AU4869800A

公开(公告)日：2001-02-01

申请号：AU4869800

申请日：2000-07-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GORDON ALEXANDER ,  TSAI SHENG-JEN ,  MATUSEVICH ALEX ,  TOBIAS JONATHAN MICHAEL ,  WANG ROBERT CHUENLIN

IPC: H04L27/22 ,  G01S1/04 ,  G01S5/10 ,  H04B7/26 ,  H04J3/00 ,  H04L27/14 ,  H04Q7/34 ,  G01S5/02 ,  H04B7/212 ,  H03C3/00 ,  H03D3/02

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated by frequency demodulating the phase-modulated signal. The phase-modulated signal is a separated into first and second copies, the first copy is phase demodulated to generate demodulated symbols, and the second copy is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to generate event signals having signature properties (signature events). These signature events are used in traditional Time Difference of Arrival tdoa algorithms to accurately determine position of a mobile unit in the wireless communication system.

公开(公告)号：CA2310368A1

公开(公告)日：2000-12-10

申请号：CA2310368

申请日：2000-05-31

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GOEDDEL THOMAS WILLIAM ,  TSAI SHENG-JEN ,  SARRAF MOHSEN ,  TOBIAS JONATHAN MICHAEL ,  MATUSEVICH ALEX

IPC: H04L27/18 ,  H04L7/033 ,  H04L27/22

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated using sample timing based at least in part on frequency information generated by frequency demodulating the phasemodulated signal. The phase-modulated signal is separated into first and second portions, the first portion is phase demodulated to generate demodulated symbols, and the second portion is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to establish the sample timing such that proper sampling of the symbols is ensured.

公开(公告)号：BR0004567A

公开(公告)日：2001-04-03

申请号：BR0004567

申请日：2000-08-25

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ANDERSON CARL RICHARD ,  MATUSEVICH ALEX ,  TOBIAS JONATHAN MICHAEL ,  HANSON KATHRYN W ,  RAUSCHER MARY ELLEN

IPC: H04J3/00 ,  H04B7/26 ,  H04W36/32 ,  H04Q7/38

Abstract: A system for performing a handoff of a wireless unit uses location information for the wireless unit to determine whether to handoff the wireless unit and/or to which base station to handoff the wireless unit. For example, a wireless unit can have a location system, such as a global positioning system (GPS), which determines the location of the wireless unit. The wireless unit can obtain location information for the wireless unit and provide the location information to the serving base station. From the location information, the serving base station can determine that the wireless unit is leaving the coverage area of the serving base station and may need to be handed off. The serving base station then can send at least a portion of the location information to the MSC, and the MSC can determine to which base station the wireless unit is handed off to based on the location information. Alternatively, the serving base station can determine to which base station the wireless unit is to be handed off.

公开(公告)号：BR0003015A

公开(公告)日：2001-03-13

申请号：BR0003015

申请日：2000-07-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GORDON ALEXANDER ,  MATUSEVICH ALEX ,  TSAI SHENG-JEN ,  TOBIAS JONATHAN MICHAEL ,  WANG ROBERT CHUENLIN

IPC: H04L27/22 ,  G01S1/04 ,  G01S5/10 ,  H04B7/26 ,  H04J3/00 ,  H04L27/14 ,  H04Q7/34 ,  G01S1/20

Abstract: A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated by frequency demodulating the phase-modulated signal. The phase-modulated signal is a separated into first and second copies, the first copy is phase demodulated to generate demodulated symbols, and the second copy is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to generate event signals having signature properties (signature events). These signature events are used in traditional Time Difference of Arrival tdoa algorithms to accurately determine position of a mobile unit in the wireless communication system.

公开(公告)号：CA2316440A1

公开(公告)日：2001-02-28

申请号：CA2316440

申请日：2000-08-18

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ANDERSON CARL RICHARD ,  RAUSCHER MARY ELLEN ,  HANSON KATHRYN W ,  MATUSEVICH ALEX ,  TOBIAS JONATHAN MICHAEL

IPC: H04J3/00 ,  H04B7/26 ,  H04W36/32 ,  H04Q7/38

Abstract: A system for performing a handoff of a wireless unit uses location informati on for the wireless unit to determine whether to handoff the wireless unit and/ or to which base station to handoff the wireless unit. For example, a wireless unit can have a location system, such as a global positioning system (GPS), which determines the location of the wireless unit. The wireless unit can obtain location information for the wireless unit and provide the location information to the serving base station. From the location information, the serving base station can determine that the wireless unit is leaving the coverage area of the serving base station and may need to be handed off. The serving base station then can send at least a portion of the locati on information to the MSC, and the MSC can determine to which base station the wireless unit is handed off to based on the location information. Alternatively, the serving base station can determine to which base station the wireless unit i s to be handed off.