公开(公告)号：WO2013025932A3

公开(公告)日：2013-05-16

申请号：PCT/US2012051201

申请日：2012-08-16

Applicant: QUALCOMM INC ,  JALALI AHMAD ,  SCHIFF LEONARD N ,  AMES WILLIAM G

Inventor： JALALI AHMAD ,  SCHIFF LEONARD N ,  AMES WILLIAM G

IPC: H04B7/185

CPC classification number: H04B7/18508 ,  H04B7/18502 ,  H04W16/14 ,  H04W36/20 ,  H04W36/30

Abstract: An air to ground communication system provides internet access to aircraft from ground based stations. The air to ground system shares spectrum with uplink portions of a satellite communication spectrum. Interference mitigation techniques are employed to avoid interference between the ground based communications and satellite communications. Fade mitigation techniques are employed to provide communication to aircraft at low angles of elevation in the presence of rain.

Abstract translation: 空对地通信系统提供从地面站到飞机的互联网接入。 空对地系统与卫星通信频谱的上行链路部分共享频谱。 采用干扰抑制技术来避免地面通信和卫星通信之间的干扰。 采用衰减消减技术来在雨天存在的情况下以低仰角提供与飞机的通信。

公开(公告)号：WO2005029729A2

公开(公告)日：2005-03-31

申请号：PCT/US2004030963

申请日：2004-09-21

Applicant: QUALCOMM INC ,  AMES WILLIAM G ,  SCHIFF LEONARD N

Inventor： AMES WILLIAM G ,  SCHIFF LEONARD N

IPC: H04B7/185 ,  H04Q7/20

CPC classification number: H04B7/18515

Abstract: An apparatus and method for a wireless communication system in which a forward/uplink portion and a return/uplink portion are assigned within an available frequency bandwidth is disclosed. More particularly, a service area is divided into multiple regions. The assignment of the forward/uplink portion of the return/uplink portion is shuffled in the multiple regions. The apparatus and method may be implemented in a multi-beam wireless communication system.

Abstract translation: 公开了一种无线通信系统的装置和方法，其中在可用频带内分配了前向/上行链路部分和返回/上行链路部分。 更具体地，服务区域被分成多个区域。 返回/上行链路部分的前向/上行链路部分的分配在多个区域中进行混洗。 该装置和方法可以在多波束无线通信系统中实现。

公开(公告)号：AU2009202870B2

公开(公告)日：2011-01-20

申请号：AU2009202870

申请日：2009-07-16

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/185 ,  H04L1/00

Abstract: Systems and methods for burden sharing in satellite based communication systems are disclosed. One or more users in a satellite based communication system may experience signal degradation or signal fading that can occur for an extended period of time, such as when the fade is due to rain fade. The system can improve a communication link with a particular user by varying the data rate. The data rate can be varied by reducing a coding rate to compensate for low signal quality. In a time multiplexed communication system where multiple users time multiplex the available communication bandwidth, the system can concurrently adjust a time allocated to a user based in part on the coding rate. The time allocated to a user can be increased for decreased coding rates in order to maintain a substantially stable symbol rate to the user for each time multiplex cycle of users.

公开(公告)号：DE60044592D1

公开(公告)日：2010-08-05

申请号：DE60044592

申请日：2000-08-16

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/185 ,  H04B7/15 ,  H04B7/26 ,  H04J13/00 ,  H04L7/00

公开(公告)号：AU2005223266B2

公开(公告)日：2009-08-27

申请号：AU2005223266

申请日：2005-03-15

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/185

Abstract: Communication diversity using a plurality of satellites is disclosed. The satellites can support multiple regions corresponding to multiple satellite beams. Each satellite can support all regions in the reverse direction and each satellite can be designated as a primary satellite for one of the multiple regions corresponding to one of the multiple satellite beams. Each satellite can receive from any of the regions reverse link signals broadcast by, for example, a mobile station. Each satellite can communicate the received reverse link signals to, for example, a base station or gateway where the signals can be combined to increase signal quality. A mobile station receives forward link signals from the primary satellite and monitors a signal quality from the primary satellite and from a secondary satellite. If the signal quality from the primary satellite drops below a threshold value, the communication signal is transferred to the secondary satellite.

公开(公告)号：DE69940514D1

公开(公告)日：2009-04-16

申请号：DE69940514

申请日：1999-07-21

Applicant: QUALCOMM INC

Inventor： ANTONIO FRANKLIN P ,  MARSH GENE W ,  STEWART RICHARD A ,  BJEREDE MARIE M ,  CHOCKALINGAM ANANTHANARAYANAN ,  KERNS ARTHUR S ,  BUTLER BRIAN ,  GROB MATTHEW S ,  DETERMAN JAMES T ,  GROVER DOUGLAS ,  SCHIFF LEONARD N ,  AMES WILLIAM G

IPC: H04B7/02 ,  H04B7/26 ,  H04B7/185 ,  H04Q7/36

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.

公开(公告)号：DE60037196T2

公开(公告)日：2008-10-02

申请号：DE60037196

申请日：2000-07-14

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/005 ,  H04L1/00 ,  H04B7/185 ,  H04B7/26

Abstract: A method and apparatus for controlling a signal transmission power. The method of the present invention includes the steps of demodulating a received signal (401) to produce a demodulated signal (407) and distorting the demodulated signal (412) to produce a distorted demodulated signal (413). The demodulated signal (412) can be distorted by, for example, adding noise. A signal quality measurement, such as signal-to-noise ratio, is then determined (416, 418, 502, 602) based on the distorted demodulated signal rather than the demodulated signal. An adjustment in the transmission power is then requested (420, 506, 508) based on the signal quality measurement of the distorted demodulated signal.

公开(公告)号：DE60322709D1

公开(公告)日：2008-09-18

申请号：DE60322709

申请日：2003-07-23

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/185

公开(公告)号：CA2348542C

公开(公告)日：2007-05-29

申请号：CA2348542

申请日：1999-10-26

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N

IPC: H04B7/005 ,  H04B1/04 ,  H04B7/26

Abstract: An apparatus and method for using a variable loop gain in a double-loop powe r control system to control the power of a forward link signal sent by a gateway to a user terminal to compensate for fading in a wireless communications system. In one embodiment the invention includes the steps of detecting fast fading in the forward link signal and informing the gateway of the fast fading; and at the gateway, reducing the loop gain of the power control loop when fast fading i s indicated. In another embodiment, the invention includes the steps of, at the gateway, detecting fast fading in a reverse link signal received from the user terminal and reducing the loop gain of the power control loop when fast fading is indicated.

公开(公告)号：BR0312080A

公开(公告)日：2007-05-29

申请号：BR0312080

申请日：2003-06-20

Applicant: QUALCOMM INC

Inventor： SCHIFF LEONARD N ,  JALALI AHMAD

IPC: H04B7/216 ,  H04B7/185 ,  H04B7/26

Abstract: Orthogonal CDMA (OCDMA) in the return link of a satellite based communications system provides improved bandwidth efficiencies; increased ability to overcome channel degrading phenomenon; reduced transmission power; or various combinations thereof. By achieving code synchronization needed for advantageous use of OCDMA in the return link of a satellite based communication system, a plurality of terminals, each with a unique time slot/code channel assignment, may transmit concurrently, with the same, or lower, aggregate power as would be used by a single terminal using TDMA. Use of OCDMA in the return link allows one or more terminals, each in a common beam and assigned a common time slot, to transmit at a higher transmission power to overcome channel degradation effects. The ability to allow for higher transmission power for a particular terminal can increase the effective data rate for that terminal by enabling the use of a higher order modulation technique.