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公开(公告)号：CA2279122A1
公开(公告)日：2000-03-18
申请号：CA2279122
申请日：1999-07-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MATUSEVICH ALEX
Abstract: In a time division multiple access communication system, adjacent and co-channel interference are reduced by discontinuing or shutting off modulation of carrier frequency signals during inactive time slots so that transmitted power of carrier frequency signals are reduced. Also, the time slots and carrier frequency signals are organized so that each carrier frequency signal has the least amount of time slots designated as active time slots. The time slots are designated so that the respective same time slots of adjacent carrier frequency signals are not concurrently designated as active time slots.
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公开(公告)号：AU3390399A
公开(公告)日：1999-12-23
申请号：AU3390399
申请日：1999-06-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MATUSEVICH ALEX
Abstract: A technique for synchronizing the timing signals in the base stations of a wireless telecommunications system is disclosed. In accordance with the illustrative embodiment of the present invention, each base station derives the frequency of its timing signal from one periodic signal, but the phase of its timing signal from a second periodic signal. In general, the base station derives its timing signal based on: (1) the frequency of a reference timing signal, and (2) the phase of a feedback signal. The reference timing signal can be obtained from a common timing source or from different timing sources which are designed to have the same frequency. The feedback signal is advantageously the confluence of two feedback loops. In accordance with the first feedback loop, the feedback signal is based on the phase of the base station's own timing signal. In accordance with the second feedback loop, the feedback signal is based on the phase of the timing signals from one or more nearby base stations. Advantageously, the feedback signal is based on the Boolean AND or NAND function of the base station's own timing signal and the timing signals of the nearby base stations.
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公开(公告)号：DE69935383D1
公开(公告)日：2007-04-19
申请号：DE69935383
申请日：1999-09-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MATUSEVICH ALEX
Abstract: In a time division multiple access communication system, adjacent and co-channel interference are reduced by discontinuing or shutting off modulation of carrier frequency signals during inactive time slots so that transmitted power of carrier frequency signals are reduced. Also, the time slots and carrier frequency signals are organized so that each carrier frequency signal has the least amount of time slots designated as active time slots. The time slots are designated so that the respective same time slots of adjacent carrier frequency signals are not concurrently designated as active time slots.
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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：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
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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Patent Agency Ranking
公开(公告)号：BR9915627A
公开(公告)日：2001-07-24
申请号：BR9915627
申请日：1999-05-31
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MATUSEVICH ALEX
Abstract: A wireless telecommunications system is disclosed that hands off a wireless terminal from one base station to another as the wireless terminal moves within a wireless telecommunications system. Each pair of communications channels (forward and reverse) that are used by the system for communication with a specific wireless terminal are not associated with a specific base station. Instead, the pair of communications channels are associated with the wireless terminal and are used by the wireless terminal both before and after a hand off. Before the hand off, the wireless terminal uses the pair of communications channels for communicating with a first base station. To accomplish the hand off to a second base station, the first base station stops using the communications channels at the same time that the second base station starts using them. Although the wireless terminal is handed off from the first base station to the second base station, re-tuning of the wireless terminal is not required.
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公开(公告)号：AU5360200A
公开(公告)日：2001-03-08
申请号：AU5360200
申请日：2000-08-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： GARCERAN JULIO ANTONIO , HANSON KATHRYN W , MATUSEVICH ALEX
Abstract: A system for determining coverage in a wireless communications systems uses location information for a wireless unit and collects information on communications between the wireless unit and the wireless communications system in association with the location information. The wireless communications system determines and/or receives location information for the wireless unit along with other information associated with the location information. The information by location can be used to represent the coverage of a geographic region. For example, during communications between a serving base station and a wireless unit, the serving base station could receive and/or determine signal quality measurements of a forward link and/or of a reverse link at a particular location. Additionally, neighboring base stations can monitor the communications and determine and/or receive location information for the location of the wireless unit along with the information associated with or corresponding to the location of the wireless unit. The associated information can be linked with additional parameters, such as wireless unit type, wireless unit identity, frequency, operating conditions and/or base station identity. In accordance with other aspects of the present invention, the information and/or measurements stored by location can be used to derive additional and/or different information by location or determine how the wireless communications system communicates with a wireless unit at a location, for example the base station to service the wireless unit at the location. A wireless unit in a location or range of location(s) could be served by a serving base station(s) at a certain transmit power and frequencies given certain operating conditions or parameters, such as time, weather, traffic load, path loss and/or interference level. A change in operating condition could trigger a dynamic change in the RF coverage provided by the serving base station(s) and/or neighboring base stations to the wireless unit(s) in the location or range of locations.
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公开(公告)号：CA2270040A1
公开(公告)日：1999-12-10
申请号：CA2270040
申请日：1999-04-27
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MATUSEVICH ALEX
Abstract: A wireless telecommunications system is disclosed that hands off a wireless terminal from one base station to another as the wireless terminal moves within a wireless telecommunications system. Each pair of communications channels (forward and reverse) that are used by the system for communication with a specific wireless terminal are not associated with a specific base station. Instead. the pair of communications channels are associated with the wireless terminal and are used by the wireless terminal both before and after a hand off. Before the hand off, the wireless terminal uses the pair of communications channels for communicating with a first base station. To accomplish the hand off to a second base station, the first base station stops using the communications channels at the same time that the second base station starts using them. Although the wireless terminal is handed off from the first base station to the second base station, re-tuning of the wireless terminal is not required.
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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：DE69935383T2
公开(公告)日：2007-11-29
申请号：DE69935383
申请日：1999-09-07
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MATUSEVICH ALEX
Abstract: In a time division multiple access communication system, adjacent and co-channel interference are reduced by discontinuing or shutting off modulation of carrier frequency signals during inactive time slots so that transmitted power of carrier frequency signals are reduced. Also, the time slots and carrier frequency signals are organized so that each carrier frequency signal has the least amount of time slots designated as active time slots. The time slots are designated so that the respective same time slots of adjacent carrier frequency signals are not concurrently designated as active time slots.
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