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    • 62. 发明申请
    • METHOD TO CREATE HIERARCHICAL MODULATION IN OFDM
    • 在OFDM中创建分层调制的方法
    • WO2005055444A2
    • 2005-06-16
    • PCT/US2004/039797
    • 2004-11-23
    • DELPHI TECHNOLOGIES, INC.WALKER, Glenn, A.DIBIASO, Eric, A.HIATT, Michael, L., Jr.
    • WALKER, Glenn, A.DIBIASO, Eric, A.HIATT, Michael, L., Jr.
    • H04B
    • H04L27/183H04B7/18513H04B7/18523H04L1/005H04L1/0066H04L27/2604H04L27/2626H04L27/2647H04L27/3488
    • The present invention involves a method for transmitting data using an orthogonal frequency division multiplex (OFDM) transmission system, such as over a terrestrial network used in satellite digital audio radio. A OF'DM signal is generated based on first input data. A variation is introduced in the OFDM signal based on second input data to generate a modified OFDM signal which is transmitted. The modified OFDM signal is decoded by performing a demodulation of the modified OFDM signal then a first and second detection to obtain the first input data and the second input data. The introduction of a variance may include introducing an additional phase offset across adjacent OFDM sub-carriers, across adjacent OFDM symbols, an additional phase offset in the OFDM signal., an additional amplitude offset in the OFDM signal, an additional amplitude augmentation in the OFDM signal, and/or a second variation in the first OFDM signal based on third input data.
    • 本发明涉及一种使用正交频分多路复用(OFDM)传输系统来发送数据的方法,例如通过卫星数字音频无线电中使用的地面网络。 基于第一输入数据产生OFDM信号。 基于第二输入数据在OFDM信号中引入变化,以生成被发送的经修改的OFDM信号。 通过对经修改的OFDM信号进行解调,然后对第一和第二检测进行解调,以获得第一输入数据和第二输入数据,对经修改的OFDM信号进行解码。 引入方差可以包括在相邻OFDM符号之间跨越相邻OFDM子载波引入附加相位偏移,在OFDM信号中附加相位偏移,OFDM信号中的附加振幅偏移,OFDM中的附加幅度增大 基于第三输入数据的第一OFDM信号中的信号和/或第二变化。
    • 64. 发明申请
    • INTERNET BROADCAST SYSTEM
    • 互联网广播系统
    • WO02032025A1
    • 2002-04-18
    • PCT/EP2000/009894
    • 2000-10-09
    • H04B7/185H04H40/90H04L29/08H04N7/16H04N7/173H04H1/00G06F17/30H04H1/10
    • H04H40/90H04B7/18523H04L67/22H04L67/306H04L69/329H04N7/17318H04N21/2543H04N21/4331H04N21/4532H04N21/454H04N21/4622H04N21/4782
    • The invention refers to a system for distributing data from a transmission station to a plurality of user stations over a transmission channel having a predetermined bandwidth. In order to provide internet services to the end user via a single direct-to-home satellite transmission channel, the transmission channel comprises a contents channel and an announcement channel, wherein the transmission station transmits over the contents channel a data subset within a certain period and transmits over the announcement channel an index of future data subsets to be transmitted, and wherein a user profile is stored in each user station characterizing the relative importance of topics of interest to the user and wherein the user station downloads data subsets from the transmission channel in accordance with the quality of matching between the index of the announcement channel and the user profile.
    • 本发明涉及一种用于通过具有预定带宽的传输信道从传输站向多个用户站分发数据的系统。 为了通过单个直接到家庭卫星传输信道向最终用户提供互联网服务,传输信道包括内容信道和通告信道,其中传输站在一定周期内通过内容信道发送数据子集 并且通过所述通知信道发送要发送的未来数据子集的索引,并且其中在每个用户站中存储表征用户感兴趣的主题的相对重要性的用户简档,并且其中所述用户站从所述传输信道下载数据子集 按照公告通道索引与用户配置文件的匹配质量。
    • 66. 发明申请
    • BROADBAND COMMUNICATION SYSTEM USING POINT AND SHOOT APPROACH
    • 使用点和拍摄方式的宽带通信系统
    • WO99049696A1
    • 1999-09-30
    • PCT/US1999/005746
    • 1999-03-16
    • H04B7/185H04Q11/04
    • H04Q11/0478H04B7/18523H04J2203/0019H04J2203/0037
    • A broadband communication network uses a point and shoot approach for data transmission. A broadband information signal is transmitted from a transmitting station to a receiving station. The information signal is divided into a series of data packets, each including addressing information and data intended for a particular receiver. The information signal is parsed to extract addressing information. The addressing information parsed from the information signal is used to construct a narrow band index signal. The narrow band index signal is transmitted, along with the broadband information signal, to a plurality of receiving stations. Each receiving station demodulates and decodes the narrow band index signal. The address information contained in the index field includes pointers to data packets in the information signal. Using the addressing information and pointers in the index signal, each receiving station can locate and extract data packets from the broadband information signal which are intended for that particular receiver. The data packets from the information signal are buffered to permit demodulation and decoding the particular packet(s) belong to that particular receiver at the same rate of the information signals.
    • 宽带通信网络使用点对点方式进行数据传输。 宽带信息信号从发送站发送到接收站。 信息信号被分成一系列数据分组,每个数据分组包括寻址信息和用于特定接收机的数据。 解析信息信号以提取寻址信息。 从信息信号解析的寻址信息用于构造窄带索引信号。 窄带索引信号与宽带信息信号一起发送到多个接收站。 每个接收站对窄带索引信号进行解调和解码。 包含在索引字段中的地址信息包括指向信息信号中的数据分组的指针。 使用索引信号中的寻址信息和指针,每个接收站可以定位和提取来自该特定接收机的宽带信息信号的数据分组。 来自信息信号的数据分组被缓冲以允许以相同的信息信号速率对属于该特定接收机的特定分组进行解调和解码。
    • 67. 发明申请
    • APPARATUS AND METHOD FOR REUSING SATELLITE BROADCAST SPECTRUM FOR TERRESTRIALLY BROADCAST SIGNALS
    • 卫星广播频谱用于重播广播信号的装置和方法
    • WO99031832A1
    • 1999-06-24
    • PCT/US1998/026655
    • 1998-12-15
    • H04B7/185H04H20/16H04H40/90H04N7/20H04H1/00
    • H04H40/90H04B7/18523H04N7/20
    • A satellite receiving antenna (16) at a user location (14) receives satellite signals at a first frequency from a satellite (12). The satellite signals travel along a satellite signal route (42) within a look angle about the centerline (28) of the antenna (16). A terrestrial transmitter (20) transmits signals at the first frequency along a wireless transmission route (40) from the transmitter to the user location (14). The terrestrial transmitter (20) is located with respect to the user location (14) so that the wireless transmission route (40) is at a relatively large angle to the centerline (28) of the first antenna (16). The angle of the wireless transmission route (40) to the satellite antenna centerline (28) is large enough so that the terrestrial signals present at the location (14) result in terrestrial input signals from the antenna (16) which are less than an interference level with respect to satellite input signals produced by the antenna. Thus, the terrestrial signals do not interfere with the satellite signals even though they are transmitted at a common frequency.
    • 在用户位置(14)处的卫星接收天线(16)从卫星(12)以第一频率接收卫星信号。 卫星信号在围绕天线(16)的中心线(28)的视角内沿着卫星信号路线(42)行进。 地面发射机(20)沿着无线传输路由(40)以第一频率从发射机向用户位置(14)发射信号。 地面发射机(20)相对于用户位置(14)定位,使得无线传输路线(40)与第一天线(16)的中心线(28)成相对较大的角度。 无线传输路由(40)到卫星天线中心线(28)的角度足够大,使得存在于位置(14)处的地面信号导致来自天线(16)的地面输入信号小于干扰 相对于由天线产生的卫星输入信号。 因此,即使以公共频率发送卫星信号,地面信号也不会干扰卫星信号。
    • 68. 发明申请
    • RELAY APPARATUS, DECODER AND SECURITY BROADCASTING APPARATUS
    • 继电器,解码器和安全广播设备
    • WO1995012951A1
    • 1995-05-11
    • PCT/JP1994001852
    • 1994-11-02
    • KABUSHIKI KAISHA TOSHIBANISHIURA, Masaaki
    • KABUSHIKI KAISHA TOSHIBA
    • H04N07/167
    • H04H40/90H04B7/18523H04H20/76H04H60/15H04H60/16H04H60/21H04H60/23H04N5/4401H04N7/1675
    • In a head end (3) for sending pay satellite broadcasts received through a BS antenna to a cable, a separation portion (11) separates scrambled video and audio signals from the received signals and another separation portion (13) separates descrambling information signals multiplexed with the audio signals and associated information packets. The descrambling information signal is packeted by a packeting portion (45). When this packeting is made, the descrambling information signal is encoded and a corresponding error correcting code is read out from a ROM and added to the encoded information signal. Next, this descrambling information packet and the associated information packet separated by the separation portion (13) are multiplexed by a VBI multiplexing portion (51) during the vertical blanking period of the video signals and in this case, the descrambling information packet is multiplexed prior to the associated information packet. The multiplexed packets of scrambled video signals from the VBI multiplexing portion (51) and the received audio signals descrambled by a descrambler (39) are subjected to frequency multiplexing in a frequency multiplexing portion (53) and are sent to the cable.
    • 在用于通过BS天线发送付费卫星广播到电缆的头端(3)中,分离部分(11)将加扰的视频和音频信号与接收到的信号分开,另一个分离部分(13)分离多路复用的解扰信息信号 音频信号和相关信息包。 解扰信息信号由打包部分(45)打包。 当进行这种打包时,对解扰信息信号进行编码,并从ROM中读出相应的纠错码并将其加到编码的信息信号上。 接下来,在视频信号的垂直消隐期间,分离部分(13)分离的该解扰信息分组和相关联的信息分组被VBI复用部分(51)复用,在这种情况下,解扰信息分组被复用 到相关联的信息分组。 来自VBI复用部分(51)的加扰视频信号的复用分组和由解扰器(39)解扰的接收音频信号在频率复用部分(53)中进行频率复用,并被发送到电缆。
    • 69. 发明申请
    • SIMULCAST TRANSMISSION SYSTEM HAVING PREDETERMINED LAUNCH TIMES
    • 具有预定发射时间的SIMULCAST传输系统
    • WO1992013417A1
    • 1992-08-06
    • PCT/US1992000497
    • 1992-01-21
    • MOTOROLA, INC.
    • MOTOROLA, INC.HIBEN, Bradley, M.BOCCI, Paul, M.
    • H04M11/00
    • H04H20/67H04B7/18523
    • A simulcast radio transmission system (250) is disclosed for transmitting message signals (318), originating from a message source (202), to a geographical area (115). The simulcast system includes a controller (204) coupled between the message source (202) and a plurality of remote transmitter sites (208, 210) for exchanging message signals (318) therebetween. Connecting the controller (204) to the plurality of transmitter sites (208, 210) are a plurality of interconnect links (224, 226), each having bounded propagation time delay characteristics. The simulcast system (250) employs a precision reference timing signal (314) for calculating a launch time, which calculation also uses a predetermined propagation time delay for determining the launch time. The controller (204) then combines (508) the message signals (318) with the launch time to establish a message bundle and sends the message bundle to at least one of the plurality of transmitters (208, 210), via at least one of the plurality of interconnect links (224, 226).
    • 公开了用于将源自消息源(202)的消息信号(318)发送到地理区域(115)的同时广播无线电传输系统(250)。 联播系统包括耦合在消息源(202)和多个远程发射器站点(208,210)之间的用于在其间交换消息信号(318)的控制器(204)。 将控制器(204)连接到多个发射机站点(208,210)是多个互连链路(224,226),每个互连链路具有有界的传播时间延迟特性。 联播系统(250)采用精确参考定时信号(314)来计算发射时间,该计算还使用预定的传播时间延迟来确定发射时间。 然后,控制器(204)将消息信号(318)与启动时间组合(508)以建立消息束,并且经由以下各项中的至少一个将消息束发送到多个发射机(208,210)中的至少一个: 多个互连链路(224,226)。
    • 70. 发明申请
    • MULTICAST SERVICE DELIVERY OVER HIGH THROUGHPUT SATELLITE IN A KA SPOT-BEAM NETWORK
    • KA SPOT-BEAM网络中的高通量卫星传输服务
    • WO2017030633A9
    • 2017-04-13
    • PCT/US2016035596
    • 2016-06-02
    • HUGHES NETWORK SYSTEMS LLC
    • ROY SATYAJIT
    • H04B7/185H04B7/204
    • H04B7/18523H04B7/18513H04B7/18517H04B7/2041H04L65/103H04L65/4076
    • A method and a satellite communication system are provided. At least one satellite gateway earth station receives at least one multicast stream from an external network. In a static forwarding mode, the at least one satellite gateway earth station replicates and forwards traffic from the at least one multicast stream over at least one first respective outroute carrier of at least one first respective spot beam of a satellite regardless of whether any terminal is arranged to actively receive any of the at least one multicast stream. In a dynamic forwarding mode, the at least one satellite gateway earth station replicates and forwards second traffic from any of the at least one multicast stream over at least one second respective outroute carrier of at least one second respective spot beam only when at least one respective terminal is arranged to actively receive the any of the at least one multicast stream.
    • 提供了一种方法和卫星通信系统。 至少一个卫星网关地球站从外部网络接收至少一个组播流。 在静态转发模式中,所述至少一个卫星网关地球站在卫星的至少一个第一相应点波束的至少一个第一相应的前向载波上复制并转发来自所述至少一个多播流的业务,而不管终端是否为 被布置为主动地接收所述至少一个多播流中的任何一个。 在动态转发模式中,至少一个卫星网关地球站仅在至少一个相应的点波束的至少一个第二相应点​​波束的至少一个第二相应的前向载波上复制并转发来自至少一个多播流中的任一个的第二业务 终端被配置为主动地接收所述至少一个多播流中的任何一个。