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公开(公告)号：JP2001086181A
公开(公告)日：2001-03-30
申请号：JP2000224391
申请日：2000-07-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GORDON ALEXANDER , TSAI SHENG-JEN , MATUSEVICH ALEX , TOBIAS JONATHAN M , WANG ROBERT C
Abstract: PROBLEM TO BE SOLVED: To create and measure an event provided with a continuing time for only several nano-seconds by stipulating a symbol transition time between symbols by a frequency measurement value. SOLUTION: The second copy of a quadrature phase shift keyed(QPSK) signal passes through a frequency modulator (FM demodulator) 120 to create the measurement value of an instantaneous frequency of the signal. A peak detector 124 catches a peak in a frequency output and creates a signature. A digital signal processor 126 gives a proper signature signal (signature event) to a call processor 128, demodulates a time slot symbol in a T/2 symbol period and obtains phase transition between the two prescribed symbols. The processor 126 monitors a T/2 window and catches the occurrence of the peak. The call processor 128 receives the signature event and seals a time stamp on it. The demodulated inter-symbol transition time is stipulated based on the frequency measurement value.
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公开(公告)号：JP2001057577A
公开(公告)日：2001-02-27
申请号：JP2000174767
申请日：2000-06-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOEDDEL THOMAS W , MATUSEVICH ALEX , SARRAF MOHSEN , TOBIAS JONATHAN M , TSAI SHENG
Abstract: PROBLEM TO BE SOLVED: To synchronize a sample process with a receiving symbol by providing a means using the measured value of the frequency of a phase modulation signal in order to control sample timing for sampling a demodulation symbol, etc. SOLUTION: The 2nd part of a QPSK signal is made to pass through an FM demodulator 120 and generates the measured value of an instantaneous frequency being a phase derivative value from a phase including transmitted data. The measured value of the frequency is used for controlling sample timing, and subsequently, an instantaneous frequency output from the demodulator 120 is added to a peak detector 124. The detector 124 generates a signature to be added to a digital signal processor 126. The processor 126 generates an appropriate sample timing signal by using the signature and gives it to a sample timing generator 128.
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公开(公告)号：JP2001177469A
公开(公告)日：2001-06-29
申请号：JP2000311492
申请日：2000-10-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOGDAN BRIAN J , GOLDEN MICHAEL J , MATUSEVICH ALEX , TOBIAS JONATHAN M , TSAMUTALIS CHRIS C
IPC: G01S13/75 , G01S13/76 , G01S13/79 , G01S19/13 , G01S19/48 , H04B7/26 , H04W64/00 , G01S5/14 , H04Q7/34
Abstract: PROBLEM TO BE SOLVED: To calculate a position of a mobile station (cellular phone) without the need for synchronization of base stations. SOLUTION: The method of this invention adopts the trigonometrical survey that calculates distances between a plurality of the base stations and a mobile station by measuring a round time delay (that is, a round time delay value) of a known symbol of a transmitted signal.
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公开(公告)号：JP2002044716A
公开(公告)日：2002-02-08
申请号：JP2001153735
申请日：2001-05-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BENEDICT RUSSELL BERNARD , MATUSEVICH ALEX , PEKRUL WINSTON EDWARD , TOBIAS JONATHAN M , TSAMUTALIS CHRIS CONSTANTINE
Abstract: PROBLEM TO BE SOLVED: To provide a method of dynamic decision for interference and the ratio of carrier to interference waves in a wireless system of time division multiple access. SOLUTION: In the method of dynamic decision for interference and the ratio of carrier to interference waves, the interferences are measured during an active TDMA time slot. In an embodiment, while a mobile station is transmitting in a discontinued transmission mode, a base station decides the level of the interference at the active time slot by using a power level measurement processed in a DTX OFF period. In another embodiment, the base station instructs to the mobile station to stop transmission between SACCH parts of the time slot, and decides measured value of the interference level 1 by using the power level measurement processed for non-active SACCH field. Furthermore in another embodiment, the interference level 1 is decided by using the power level measurement processed for a guard and a ramp field.
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Patent Agency Ranking
公开(公告)号：JP2001112041A
公开(公告)日：2001-04-20
申请号：JP2000262274
申请日：2000-08-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ANDERSON CARL RICHARD , HANSON KATHRYN W , MATUSEVICH ALEX , RAUSCHER MARY ELLEN , TOBIAS JONATHAN M
Abstract: PROBLEM TO BE SOLVED: To provide a wireless unit hand-off execution system that decides whether or not hand-off is required for a wireless unit and/or decides a base station that hands off the wireless unit by using the position information of the wireless unit. SOLUTION: For example, the wireless unit has a position system such as a global positioning system GPS to decide its own position. The wireless unit acquires the position information of itself and provides the position information to a base station in service. The base station in service detects that the wireless unit is moving away from a service area of the base station on the basis of the position information and decides the necessity of hand-off. Then the base station in service transmits at least part of the position information to an MSC, and the MSC can decide the base station that hands off the wireless unit. In other method, the base station in service can decide a base station that hands off the wireless unit.
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公开(公告)号：DE60035548D1
公开(公告)日：2007-08-30
申请号：DE60035548
申请日：2000-05-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOEDDEL THOMAS W , MATUSEVICH ALEX , SARRAF MOHSEN , TOBIAS JONATHAN M , TSAI SHENG-JEN
IPC: H04L7/033 , H04L27/18 , H04L27/22 , H04L27/233
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.
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公开(公告)号：DE60021241T2
公开(公告)日：2006-04-27
申请号：DE60021241
申请日：2000-10-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOGDAN BRIAN J , GOLDEN MICHAEL J , MATUSEVICH ALEX , TOBIAS JONATHAN M , TSAMUTALIS CHRIS C
Abstract: A method for locating a mobile unit without synchronizing base-stations is provided. A triangulation scheme where distances between a plurality of base-stations and a mobile unit (herein termed mobile) are calculated by measuring at least three round-trip-delay-values wherein each round-trip-delay-value corresponds to transmission of a downlink signal from each base-station to the mobile unit and transmission of an uplink signal, in response to the downlink signal, from the mobile unit to each base-station is described. It is a low-cost solution without requiring the participating base-stations to be accurately synchronized in time and with the added advantages of utilizing a known downlink signal and a known uplink signal in determining the position of the mobile.
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公开(公告)号：DE60035548T2
公开(公告)日：2008-03-20
申请号：DE60035548
申请日：2000-05-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GOEDDEL THOMAS W , MATUSEVICH ALEX , SARRAF MOHSEN , TOBIAS JONATHAN M , TSAI SHENG-JEN
IPC: H04L7/033 , H04L27/18 , H04L27/22 , H04L27/233
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.
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公开(公告)号：DE60021241D1
公开(公告)日：2005-08-18
申请号：DE60021241
申请日：2000-10-09
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BOGDAN BRIAN J , GOLDEN MICHAEL J , MATUSEVICH ALEX , TOBIAS JONATHAN M , TSAMUTALIS CHRIS C
IPC: G01S13/75 , G01S13/76 , G01S13/79 , G01S19/13 , G01S19/48 , H04B7/26 , H04W64/00 , H04Q7/38 , G01S5/00
Abstract: A method for locating a mobile unit without synchronizing base-stations is provided. A triangulation scheme where distances between a plurality of base-stations and a mobile unit (herein termed mobile) are calculated by measuring at least three round-trip-delay-values wherein each round-trip-delay-value corresponds to transmission of a downlink signal from each base-station to the mobile unit and transmission of an uplink signal, in response to the downlink signal, from the mobile unit to each base-station is described. It is a low-cost solution without requiring the participating base-stations to be accurately synchronized in time and with the added advantages of utilizing a known downlink signal and a known uplink signal in determining the position of the mobile.
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