-
公开(公告)号：US10693574B2
公开(公告)日：2020-06-23
申请号：US15190601
申请日：2016-06-23
发明人： Qiang Wu , Peter John Black , Jelena Damnjanovic
IPC分类号： H04B17/364 , H04B7/204 , H04B7/185 , H04L5/14 , H04W24/08
摘要： Methods and apparatus for efficient transmission of data by half-duplex transceivers in satellite communication systems are provided. Time reference for the return link is skewed or time-lagged relative to the time reference for the forward link to reduce the amount of guard time required to separate return link transmission from forward link reception by the half-duplex transceiver of a user terminal. The guard time is determined based on a maximum differential round-trip propagation delay and transition times of the half-duplexer transceiver to switch between transmit and receive modes. In a satellite communication system in which a large number of active user terminals are present in a beam coverage, random time offsets are applied to spread approximately equal traffic loads across the time offsets.
-
公开(公告)号：US20180376392A1
公开(公告)日：2018-12-27
申请号：US16012613
申请日：2018-06-19
发明人： Qiang Wu , Peter John Black , Ruoheng Liu
摘要： A method and apparatus for operating a satellite system including different satellites that may belong to different types of satellite constellations. In some implementations, the satellite system may include a LEO satellite constellation and one or more non-LEO satellite constellations that can be used to increase the forward link capacity of the LEO satellite constellation, for example, by allowing an LEO satellite to offload at least some of its forward link traffic to one of the non-LEO satellites. The user terminals can dynamically switch forward link communications between a LEO satellite and a non-LEO satellite while maintaining a return link connection with the LEO satellite.
-
公开(公告)号：US09585150B2
公开(公告)日：2017-02-28
申请号：US14864791
申请日：2015-09-24
CPC分类号： H04W72/046 , H04B7/185 , H04B7/18513 , H04B7/18539 , H04B7/2041 , H04W52/243
摘要： A method and apparatus for operating one or more satellites in a non-geosynchronous orbit (NGSO) satellite constellation are disclosed. In some aspects, a coverage area on Earth for a first beam transmitted from a first satellite in the NGSO satellite constellation may be determined, a cone may be projected onto a first region of the beam coverage area, a second region of the beam coverage area may be defined as including portions of the beam coverage area lying outside the first region, and a minimum arc angle for each of a plurality of points within the first region but not the second region of the beam coverage area may be determined.
摘要翻译： 公开了一种在非地球同步轨道（NGSO）卫星星座中操作一个或多个卫星的方法和装置。 在一些方面中，可以确定从NGSO卫星星座中的第一卫星发送的用于第一波束的地球上的覆盖区域，锥体可投影到波束覆盖区域的第一区域，波束覆盖区域的第二区域 可以被定义为包括位于第一区域之外的波束覆盖区域的部分，并且可以确定波束覆盖区域的第一区域内但不是波束覆盖区域的第二区域中的多个点中的每一个点的最小弧角。
-
公开(公告)号：US11146328B2
公开(公告)日：2021-10-12
申请号：US14865390
申请日：2015-09-25
发明人： James Determan , Dan Vassilovski , Peyman Razaghi , Allen Minh-Triet Tran , Mehmet Izzet Gurelli , Sumeeth Nagaraja , Peter John Black , Qiang Wu , Gene Wesley Marsh
摘要： A non-geosynchronous satellite system, where each satellite has an antenna (perhaps a multi-element antenna) to form a beam pattern comprising a set of beams in the footprint of the satellite, where in one implementation each beam is substantially elliptical in shape having a minor axis and a major axis, where the minor axes are substantially collinear and the major axes are substantially oriented east to west. For a satellite, power is reduced or turned off for a subset of the set of beams, wherein each beam in the subset is reduced at or below a corresponding power level such that when a beam is powered above its corresponding power level an equivalent power flux-density (EPFD) exceeds a limit at some point on the Earth's surface.
-
公开(公告)号：US10694517B2
公开(公告)日：2020-06-23
申请号：US15849455
申请日：2017-12-20
摘要： Embodiments disclosed herein relate to methods and systems for providing improved position location (e.g., time-of-arrival) measurement and enhanced position location in wireless communication systems. In an example method, an access terminal may receive a reference signal in a time slot, the reference signal comprising a sequence of symbols known to a receiver before being received, and may determine, based at least in part on the reference signal, a position location of the access terminal.
-
公开(公告)号：US20190305882A1
公开(公告)日：2019-10-03
申请号：US16366997
申请日：2019-03-27
摘要： Methods, systems, and devices for wireless communications are described. Efficient low-density parity-check (LDPC) scheduling of layered decoding may include receiving a message encoded as an LDPC code that includes a number of check nodes and a number of bit nodes, applying a first number of decoding iterations to decoding the message, applying a second number of decoding iterations to decoding the message after the first number of decoding iterations are applied, and decoding the message through completion of both the first number of decoding iterations and the second number of decoding iterations. In some cases, only a portion of the number of check nodes is decoded during each of the first number of decoding iterations and all of the number of check nodes are decoded during each of the second number of decoding iterations.
-
公开(公告)号：US20180376393A1
公开(公告)日：2018-12-27
申请号：US16012639
申请日：2018-06-19
发明人： Qiang Wu , Peter John Black , Ruoheng Liu
摘要： A method and apparatus for operating a satellite system including different satellites that may belong to different types of satellite constellations. In some implementations, the satellite system may include a LEO satellite constellation and one or more non-LEO satellite constellations that can be used to increase the forward link capacity of the LEO satellite constellation, for example, by allowing an LEO satellite to offload at least some of its forward link traffic to one of the non-LEO satellites. The user terminals can dynamically switch forward link communications between a LEO satellite and a non-LEO satellite while maintaining a return link connection with the LEO satellite.
-
公开(公告)号：US20180278363A1
公开(公告)日：2018-09-27
申请号：US15991712
申请日：2018-05-29
发明人： Naga Bhushan , Peter John Black
CPC分类号： H04L1/0002 , H04L1/0003 , H04L1/0007 , H04L1/0009 , H04L1/0025 , H04L1/005 , H04L1/0059 , H04L1/0066 , H04L1/0069 , H04L1/0071 , H04L1/0083 , H04L1/18 , H04L5/0048
摘要： In a transmission scheme wherein multi-slot packet transmissions to a remote station can be terminated by an acknowledgment signal from the remote station, code symbols can be efficiently packed over the multi-slot packet so that the remote station can easily decode the data payload of the multi-slot packet by decoding only a portion of the multi-slot packet. Hence, the remote station can signal for the early termination of the multi-slot packet transmission, which thereby increases the data throughput of the system.
-
公开(公告)号：US10075313B2
公开(公告)日：2018-09-11
申请号：US15584920
申请日：2017-05-02
发明人： Peter John Black
CPC分类号： H04L27/261 , H04L1/0026 , H04L1/1671 , H04L5/0007 , H04L5/0037 , H04L5/005 , H04L5/0091 , H04L27/2613 , H04W36/18 , H04W74/04
摘要： Embodiments disclosed herein relate to methods and systems for pilot grouping, route protocols, and scheduling in multi-carrier communication systems. In an embodiment, an access terminal may group a plurality of pilot signals characterized by different frequencies into one or more pilot groups, each pilot grouping being identified by a plurality of parameters (e.g., a PN offset and a group ID). Each pilot group may include pilot signals having substantially the same coverage area. The access terminal may further select a representative pilot signal from each pilot group for pilot strength reporting. The access terminal may also use the pilot grouping for effective set management.
-
10.发明申请公开(公告)号：US20180115973A1
公开(公告)日：2018-04-26
申请号：US15849455
申请日：2017-12-20
摘要： Embodiments disclosed herein relate to methods and systems for providing improved position location (e.g., time-of-arrival) measurement and enhanced position location in wireless communication systems. In an example method, an access terminal may receive a reference signal in a time slot, the reference signal comprising a sequence of symbols known to a receiver before being received, and may determine, based at least in part on the reference signal, a position location of the access terminal.
-
-
-
-
-
-
-
-
-
搜索结果
34 条记录 (耗时 0.021 秒)
