-
公开(公告)号：CA2380264C
公开(公告)日：2008-11-25
申请号：CA2380264
申请日：2000-07-14
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
Abstract: A method and apparatus for controlling a signal transmission power. The meth od 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 determine d (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：DE60038676D1
公开(公告)日：2008-06-05
申请号：DE60038676
申请日：2000-05-03
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
-
13.发明专利
公开(公告)号：ES2281202T3
公开(公告)日：2007-09-16
申请号：ES99963873
申请日：1999-11-09
Applicant: QUALCOMM INC
Inventor： ANTONIO FRANKLIN P , SCHIFF LEONARD N , AMES WILLIAM G
Abstract: Un procedimiento para el aislamiento de transmisiones de canales múltiples sobre señales de comunicaciones de múltiples fuentes (102, 104, 106) de señal, comprendiendo dicho procedimiento: dividir dichos canales en N grupos de canales; y transmitir primera información sobre uno primero de dichos N grupos de canales desde una primera fuente (102, 104, 106) de señal utilizando un primer modo de polarización mientras que se transmite simultáneamente de forma sustancial segunda información sobre un segundo de dichos N grupos de canales desde una segunda fuente (102, 104, 106) de señal utilizando un segundo modo de polarización que es sustancialmente ortogonal al primer modo de polarización, caracterizado por después: transmitir la primera información sobre el primero de dichos N grupos de canales desde dicha segunda fuente (102, 104, 106) de señal utilizando dicho segundo modo de polarización mientras que se transmite simultáneamente de forma sustancial la segunda información sobre el segundo de dichos N grupos de canales desde dicha primera fuente (102, 104, 106) de señal utilizando dicho primer modo de polarización.
-
公开(公告)号：CA2337992C
公开(公告)日：2006-01-24
申请号：CA2337992
申请日：1999-07-21
Applicant: QUALCOMM INC
Inventor： MARSH GENE W , STEWART RICHARD A , GROB MATTHEW S , SCHIFF LEONARD N , BJEREDE MARIE M , ANTONIO FRANKLIN P , AMES WILLIAM G , CHOCKALINGAM ANANTHANARAYANAN , BUTLER BRIAN , DETERMAN JAMES T , GROVER DOUGLAS , KERNS ARTHUR S
Abstract: Method for reducing call dropping rates in a multi-beam communication system that includes a user terminal, a gateway, and a plurality of beam sources projecting a plurality of beams, and where a link between the user terminal and the gateway is established on one or more beams. The method relies on a messaging protocol between the gateway and the user. Based on messages sent from the user to the gateway, preferably on a preselected periodic basis, the gateway determines the more desirable beam(s) for transmitting to the user. The messages sent from the user to the gateway contain values representing beam strengths as measured at the user. The gateway uses the user measured beam strengths to select the beams that should be used for the user. The beams to be used are the beams that will decrease the call dropping rates and provide a desired level of beam source diversity.
-
公开(公告)号：HK1071973A1
公开(公告)日：2005-08-05
申请号：HK05104785
申请日：2005-06-08
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
IPC: H04L20090101 , 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.
-
Patent Agency Ranking
公开(公告)号：BR0009369A
公开(公告)日：2004-04-20
申请号：BR0009369
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
-
公开(公告)号：AU2003252133A1
公开(公告)日：2004-02-09
申请号：AU2003252133
申请日：2003-07-23
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N , MILLER DAVID S
IPC: H04B7/185
Abstract: A satellite communication system for providing communications between user terminals and gateways constituted with m primary satellites. In one embodiment, n back up satellites are also provided. Further, each satellite, primary or back-up, is equipped to project N/m beams onto and across an area in a loosely-packed array manner. M of the m primary and n back-up satellites collectively create N beam spots to cover the area. Moreover, each sub-area is covered by a beam spot separated from another sub-area covered by another beam spot by one beam width. Each satellite is also equipped to facilitate communication over 1 of m band of frequencies on one beam. AS a result, any of the m primary satellites may be efficiently replaced on demand by a selected one of the n back-up satellites. The gateways and user terminals are configured to communicate signals through or with both or either the primary and back-up satellites.
-
公开(公告)号：BR0013341A
公开(公告)日：2003-02-25
申请号：BR0013341
申请日：2000-08-16
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N
Abstract: A method for deep paging in a communication system employing orthogonal channelizing codes, such as Walsh sequences, of predetermined length m, that does not require a high powered paging channel. The method includes the steps of generating a paging channel message which is combined with a Walsh sequence having a length greater than or equal to 2 m , and transmitting the paging channel message at a data rate of less than 480 bits per second (bps). By transmitting the paging channel message at a low data rate and integrating collected energy over a period longer by a factor on the order of 1000, the message is able to penetrate buildings and other structures or high attenuation environments, thereby allowing one to successfully page a user terminal that is inside such a structure or area. Preferably, the paging channel message is formed using an auxiliary Walsh sequence on the order of 65536 chips in length, and the data rate is less than 10 bps.
-
公开(公告)号：AU743859B2
公开(公告)日：2002-02-07
申请号：AU4649897
申请日：1997-09-23
Applicant: QUALCOMM INC
Inventor： SCHIFF LEONARD N , MILLER DAVID S
-
公开(公告)号：BR9915144A
公开(公告)日：2002-01-02
申请号：BR9915144
申请日：1999-11-09
Applicant: QUALCOMM INC
Inventor： ANTONIO FRANKLIN P , SCHIFF LEONARD N , AMES WILLIAM G
Abstract: The information signals are transferred to end users, customers, or service subscribers using at least two signal sources, generally satellites, and polarized radiation. Two polarization modes are employed, with the preferred modes being left-hand and right-hand circularly polarized radiation, although other polarization modes may be employed. The total number of channels can be divided among the polarization modes and transferred to end users either through the use of polarization switching in the receivers to selectively switch between the satellites, or by switching elements in the satellites (sources) to switch between polarization modes used for transmission.
-
-
-
-
-
-
-
-
-
Search Results
145
records
(took 0.024 seconds)
