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公开(公告)号：AT393501T
公开(公告)日：2008-05-15
申请号：AT00930387
申请日：2000-05-03
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD
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公开(公告)号：AT218777T
公开(公告)日：2002-06-15
申请号：AT98954979
申请日：1998-10-14
Applicant: QUALCOMM INC
Inventor： SILBERGER AMNON , BUTLER BRIAN , SCHIFF LEONARD
Abstract: A method and apparatus for accurately determining the operating characteristics or impact of nonlinear effects on devices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately determine system response. This information can be used by power control loops in controlling or adjusting the operation of nonlinear elements or stages such as high power amplifiers in orthogonal CDMA communication systems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The measurements used to formulate the WPR can be made to individual components or to entire systems by injecting communication signals in multiple channels containing data, and leaving at least one empty channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empty to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operation through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.
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公开(公告)号：CA2306375C
公开(公告)日：2008-12-09
申请号：CA2306375
申请日：1998-10-14
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD , BUTLER BRIAN , SILBERGER AMNON
Abstract: A method and appararatus for accurately determining the operating characteristics or im-pact of nonlinear effects on de-vices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately deter-mine system response. This in-formation can be used by power control loops in controlling or adjusting the operation of non--linear elements or stages such as high power amplifiers in orthog-onal CDMA communication sys-tems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The mea-surements used to formulate the WPR can be made to individual components or to entire systems by injecting communication sig-nals in multiple channels containing data, and leaving at least one empt y channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empt y to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operatio n through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.
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公开(公告)号：AT406061T
公开(公告)日：2008-09-15
申请号：AT97945252
申请日：1997-09-23
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD , MILLER DAVID
Abstract: A handoff technique in which system users detect transitions in service between a current service area and an adjacent service area, and request a forward link channel in the new service area 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 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 minimum change in energy from a prior pilot signal is detected. In addition, communications using the previous service area can be dropped almost immediately upon engaging the new service area.
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公开(公告)号：AT399401T
公开(公告)日：2008-07-15
申请号：AT03765994
申请日：2003-07-23
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD
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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Patent Agency Ranking
公开(公告)号：CA2306375A1
公开(公告)日：1999-04-22
申请号：CA2306375
申请日：1998-10-14
Applicant: QUALCOMM INC
Inventor： BUTLER BRIAN , SILBERGER AMNON , SCHIFF LEONARD
Abstract: A method and appararatus for accurately determining the operating characteristics or impact of nonlinear effects on devices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately determine system response. This information can be used by power control loops in controlling or adjusting the operation of nonlinear elements or stages such as high power amplifiers in orthogonal CDMA communication systems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The measurements used to formulate the WPR can be made to individual components or to entire systems by injecting communication signals in multiple channels containing data, and leaving at least one empty channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empty to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operation through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.
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公开(公告)号：AT424663T
公开(公告)日：2009-03-15
申请号：AT99937339
申请日：1999-07-21
Applicant: QUALCOMM INC
Inventor： ANTONIO FRANKLIN , MARSH GENE , STEWART RICHARD , BJEREDE MARIE , CHOCKALINGAM ANANTHANARAYANAN , KERNS ARTHUR , BUTLER BRIAN , GROB MATTHEW , DETERMAN JAMES , GROVER DOUGLAS , SCHIFF LEONARD , AMES WILLIAM
Abstract: A method for reducing call dropping rates in a multi-beam communication system. The multi-beam communication system includes a user terminal, a gateway, and a plurality of beam sources, where each beam source projects a plurality of beams, and where a communication link between the user terminal and the gateway is established on one or more beams. The method according to the present invention relies on a messaging protocol between the gateway and the user terminal. Based on messages sent from the user terminal to the gateway, preferably on a preselected periodic basis, the gateway can determine the more desirable beam(s) for transmitting data or information to the user terminal. The messages sent from the user terminal to the gateway contain values representing beam strengths as measured at the user terminal. The gateway uses the user terminal measured beam strengths to select the beams that should be used for transmitting data or information to the user terminal. The beams that should be used are the beams that if used will decrease the call dropping rates and provide a desired level of beam source diversity.
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公开(公告)号：AT409990T
公开(公告)日：2008-10-15
申请号：AT00941757
申请日：2000-06-22
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD
Abstract: A system and method for spatial multiplexing signals on the feeder links of a satellite communication system. A beamforming antenna forms a plurality of feeder beams from signals received from system gateways, each feeder beam illuminating one of the gateways and including a plurality of frequency division multiple access (FDMA) channels. A plurality demultiplexers separate each of the feeder beams into the FDMA channels, and signal combiners combine first and second ones of the channels, each comprising signals corresponding to user terminals illuminated by a specific user beam, to produce a user beam signal which is used by a beamforming user link antenna to form a specific user beam. In a further aspect, a user link beamforming antenna forms a plurality of user beams from signals received from user terminals, each including a plurality of FDMA channels, and a plurality of demultiplexers separate each of the user beams into the channels. A combiner combines a first and a second one of the FDMA channels, which comprise signals corresponding to a gateway illuminated by a specific feeder beam, to produce a feeder beam signal which is used by a user link beamforming antenna to form a specific feeder beam.
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公开(公告)号：AT363791T
公开(公告)日：2007-06-15
申请号：AT96913014
申请日：1996-04-22
Applicant: QUALCOMM INC
Inventor： ZEHAVI EPHRAIM , WOLF JACK , SCHIFF LEONARD
Abstract: A variable rate transmission system wherein a packet of variable rate data generated by a variable rate data source is modulated on traffic channel by traffic channel modulator if the capacity of the traffic channel is capable of transmitting the packet. And where the packet of variable rate data is modulated onto traffic channel by traffic channel modulator and at least one overflow channel by traffic channel modulator, if the capacity of the traffic channel is less than required to transmit the packet. A receiving system for receiving variable rate data transmitted in accordance with the above.
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公开(公告)号：HK1050091A1
公开(公告)日：2003-06-06
申请号：HK03102186
申请日：2003-03-26
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD
IPC: H04B20060101 , H04B7/185
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