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公开(公告)号：ZA9603021B
公开(公告)日：1996-10-24
申请号：ZA9603021
申请日：1996-04-16
Applicant: QUALCOMM INC
Inventor： ZEHAVI EPHRAIM , WOLF JACK K , SCHIFF LEONARD N
IPC: H04B7/15 , H04J3/24 , H04J11/00 , H04J13/00 , H04L1/00 , H04L12/28 , H04L12/56 , H04W72/04 , H04B , H04L , H04Q
CPC classification number: H04L1/0083 , H04B7/18513 , H04J3/247 , H04J13/00 , H04L1/0014 , H04W72/0486
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公开(公告)号：IN2258CHN2014A
公开(公告)日：2015-06-19
申请号：IN2258CHN2014
申请日：2014-03-25
Applicant: QUALCOMM INC
Inventor： JALALI AHMAD , TIAN BIN , SCHIFF LEONARD N , AMES WILLLIAM G
Abstract: A method for air to ground communication interference mitigation within an aircraft equipped with a multi beam array antenna includes adjusting a modulation symbol interleaving and/or forward error correction of an aircraft receiver interface in response to detected interference from an interferer. The method further includes reducing a data rate of the aircraft receiver interface when the adjusting of the modulation symbol interleaving and/or forward error correction does not mitigate the detected interference. Another method for interference mitigation may include performing antenna beam steering away from a geographic (GEO) arc during an aircraft turn. This method further includes reducing an aircraft transmitter transmit power when a signal quality of a forward link is within a predetermined range of a signal quality threshold.
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公开(公告)号：CA2368415C
公开(公告)日：2010-07-27
申请号：CA2368415
申请日：2000-03-29
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
Abstract: Apparatus and method for paging a user terminal (UT) using a satellite communications system having a gateway and one or more satellites, wherein each satellite produces a plurality (n) of beams and each beam includes a plurality of channels. The method of the present invention includes the step of recalling a first location of the UT, wherein the first location corresponds to a location of the UT at a first time t1. In one embodiment, this is accomplished by performing a lookup in a table or database that includes location information for user terminals at different points in time. The method also includes the step of determining a first group (g1) of beams which covers the first location of the UT at a second time t2, where g1
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公开(公告)号：DE69942423D1
公开(公告)日：2010-07-08
申请号：DE69942423
申请日：1999-10-26
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
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公开(公告)号：ES2310525T3
公开(公告)日：2009-01-16
申请号：ES00978290
申请日：2000-10-27
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
Abstract: Un procedimiento para comunicaciones por satélite, en el que una pasarela (108) se comunica con un satélite (102) a través de un enlace (112) de alimentación, y en el que el satélite (102) se comunica con terminales (106) de usuario terrestres a través de un enlace (110) de usuario, que comprende las etapas de: multiplexar (402), en la pasarela (108), una primera señal BPSK y una segunda señal BPSK para producir una señal (612) de enlace de alimentación, en el que dicha señal (612) de enlace de alimentación se modula por QPSK y se ensancha por QPSK; transmitir (404) dicha señal (612) de enlace de alimentación desde la pasarela (108) al satélite (102); desmultiplexar (406), en el satélite (102), dicha señal (612) de enlace de alimentación para producir dichas señales BPSK primera y segunda; modular (408), en el satélite (102), dicha primera señal BPSK para producir una primera señal de enlace de usuario, en el que dicha primera señal de enlace de usuario se modula por BPSK y se ensancha por QPSK; modular (408), en el satélite (102), dicha segunda señal BPSK para producir una segunda señal de enlace de usuario, en el que dicha segunda señal de enlace de usuario se modula por BPSK y se ensancha por QPSK; y transmitir (410) dichas señales de enlace de usuario primera y segunda desde el satélite (102) a los terminales (106) de usuario.
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Patent Agency Ranking
公开(公告)号：DE60321796D1
公开(公告)日：2008-08-07
申请号：DE60321796
申请日：2003-07-23
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
IPC: H04L1/00
Abstract: Time-scattering of data is employed to reduce the interference effects, such as, error rate, between terminals disposed in nearby beams, or cells, of a communication system. A scattering schedule is determined, typically by a gateway, for a terminal. Scattering instructions, based at least in part on that scattering schedule, are provided to the terminal. The scattering instructions provide terminals with information suitable for controlling the temporal scattering of time slot data to be transmitted by the terminals so that interference impact of nearby out-of beam terminals is reduced. Time-scattered data received by a receiver remote from the terminal is returned to the desired order by sorting the data in accordance with the scattering schedule to achieve a reversing of the scattering. Time-scattering may be applied to data moving in either or both of the forward and reverse directions of a communication system.
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公开(公告)号：CA2266951C
公开(公告)日：2008-06-03
申请号：CA2266951
申请日：1997-09-23
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N , MILLER DAVID S
Abstract: A handoff technique in which system users detect transitions in service between a current service area (B10, S4) and an adjacent service area (B2, S5), and request a forward link channel in the new service area (B2, S5) when a detected signal strength for the new service area exceeds predetermined threshold levels. The forward communications link in the current service area is maintained until the strength of the new service area signal (B2, S5) reaches a certain level and appropriate channel quality is confirmed, as based on various known criteria. Typically, service area transitions are detected using the signal strength of pilot or paging signals associated with service areas, which are used to determine a relative signal strength of new service area signals. Pilot signal level adjustments used to counter roll-off effects are detected and compensated for in comparing signal levels . To minimize the burden on system resources, new service area signals are not selectable until a minimum time has passed, or a minimu m change in energy from a prior pilot signal is detected. In addition, communications using the previous service area can be dropped almo st immediately upon engaging the new service area.
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公开(公告)号：AU2004203062B2
公开(公告)日：2007-11-08
申请号：AU2004203062
申请日：2004-07-08
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
IPC: H04B7/185
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公开(公告)号：AR050157A1
公开(公告)日：2006-10-04
申请号：ARP050102272
申请日：2005-06-02
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N , JALALI AHMAD , SHI WEI
IPC: H04B7/185
Abstract: Métodos y aparatos para la provision de una comunicacion de acceso multiple ortogonal en el enlace de retorno de un sistema de comunicacion satelital. En una realizacion se puede desarrollar un control de bucle cerrado de un parámetro de transmision asociado a senales de transmision. Sumado a ello, se monitorea los cambios de movimiento de una terminal de manera tal que se lleva a cabo un control de bucle abierto de un parámetro de transmision si el cambio detectado alcanza un umbral determinado. Por ejemplo, si se detecta un movimiento abrupto o repentino se lleva a cabo un control abierto.
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公开(公告)号：AT326796T
公开(公告)日：2006-06-15
申请号：AT00918519
申请日：2000-03-29
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
Abstract: Apparatus and method for paging a user terminal (UT) using a satellite communications system having a gateway and one or more satellites, wherein each satellite produces a plurality (n) of beams and each beam includes a plurality of channels. The method of the present invention includes the step of recalling a first location of the UT, wherein the first location corresponds to a location of the UT at a first time t1. In one embodiment, this is accomplished by performing a lookup in a table or database that includes location information for user terminals at different points in time. The method also includes the step of determining a first group (g1) of beams which covers the first location of the UT at a second time t2, where g1
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