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公开(公告)号：US6138261A
公开(公告)日：2000-10-24
申请号：US69681
申请日：1998-04-29
CPC分类号： H03M13/15
摘要： The present invention provides a method for custom coding uplink signals and downlink beams in a satellite communications system. The method includes the step of applying, at a ground station (100), an outer code (102) to an uplink signal to produce an outer coded uplink signal. Next, the ground station (100) applies a selected reduced complexity inner code (104) to the outer coded uplink signal to produce a concatenated coded uplink signal. The ground station (100) transmits the concatenated coded uplink signal to a satellite (110). At the satellite (110), the inner code of the concatenated coded uplink signal is decoded (116) to produce an outer coded satellite data stream. Next, the satellite (110) applies a selected inner code (120) to a portion of the outer coded satellite data stream to produce a concatenated coded satellite data stream. The satellite (110) then transmits the concatenated coded satellite data stream in a downlink beam to a destination ground station (126).
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2.发明授权
公开(公告)号：US6070074A
公开(公告)日：2000-05-30
申请号：US66069
申请日：1998-04-24
IPC分类号： H04Q7/20
CPC分类号： H04L1/0009 , H04B7/18534 , H04L1/0065 , H04L1/203 , H04L1/0071
摘要： A method for enhancing the performance of a communications system is disclosed. The system generally includes an originating ground station (300) which produces error-control coded uplink signals and transmits the coded uplink signals to a satellite (310). The system also includes a destination ground station (326) which receives a downlink beam from the satellite (310). The method includes the steps of receiving uplink signals transmitted by an originating ground station (300) at a destination ground station (326) and determining a downlink channel signal quality indication (504) at the destination ground station (326). The method also includes the steps of measuring an error rate associated with at least a portion of a downlink beam at said destination ground station (326) and determining an operating point (506) relative to a desired performance curve (502) based on the signal quality indication (504) and the error rate. At least one signal processing parameter of said originating ground station (300) is adjusted based on the operating point (506) when said operating point (506) lies in a predetermined region relative to the performance curve (502).
摘要翻译： 公开了一种用于增强通信系统的性能的方法。 该系统通常包括产生误差控制编码的上行链路信号的发起地面站（300），并将编码的上行链路信号发送到卫星（310）。 该系统还包括从卫星（310）接收下行链路波束的目的地地面站（326）。 该方法包括以下步骤：在目的地地面站（326）处接收由始发地面站（300）发送的上行链路信号，并确定目的地地面站（326）处的下行链路信道质量指示（504）。 该方法还包括以下步骤：测量与所述目的地地面站（326）处的下行链路波束的至少一部分相关联的错误率，并基于该信号确定相对于期望性能曲线（502）的操作点（506） 质量指示（504）和错误率。 当所述工作点（506）位于相对于性能曲线（502）的预定区域时，基于工作点（506）来调节所述始发地面站（300）的至少一个信号处理参数。
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公开(公告)号：US06516438B1
公开(公告)日：2003-02-04
申请号：US09690232
申请日：2000-10-17
IPC分类号： H03M1300
CPC分类号： H03M13/15
摘要： The present invention provides a method for custom coding uplink signals and downlink beams in a satellite communications system. The method includes the step of applying, at a ground station (100), an outer code (102) to an uplink signal to produce an outer coded uplink signal. Next, the ground station (100) applies a selected reduced complexity inner code (104) to the outer coded uplink signal to produce a concatenated coded uplink signal. The ground station (100) transmits the concatenated coded uplink signal to a satellite (110). At the satellite (110), the inner code of the concatenated coded uplink signal is decoded (116) to produce an outer coded satellite data stream. Next, the satellite (110) applies a selected inner code (120) to a portion of the outer coded satellite data stream to produce a concatenated coded satellite data stream. The satellite (110) then transmits the concatenated coded satellite data stream in a downlink beam to a destination ground station (126).
摘要翻译： 本发明提供一种在卫星通信系统中自定义编码上行链路信号和下行链路波束的方法。 该方法包括在地面站（100）向上行链路信号应用外部码（102）以产生外部编码的上行链路信号的步骤。 接下来，地面站（100）将所选择的缩小复杂度内码（104）应用于外部编码的上行链路信号，以产生级联编码的上行链路信号。 地面站（100）将连续编码的上行链路信号发送到卫星（110）。 在卫星（110）处，对拼接编码的上行链路信号的内部码进行解码（116）以产生外部编码的卫星数据流。 接下来，卫星（110）将所选择的内部码（120）应用于外部编码卫星数据流的一部分，以产生级联编码的卫星数据流。 卫星（110）然后将下行链路波束中的级联编码的卫星数据流发送到目的地地面站（126）。
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公开(公告)号：US06320850B1
公开(公告)日：2001-11-20
申请号：US09066064
申请日：1998-04-24
IPC分类号： H04B7185
CPC分类号： H04B7/18513
摘要： A method for maximizing satellite downlink information rate is disclosed. A ground transmitter (102) applies an outer block code to a data channel, modulates it, and transmits an uplink data stream (104) to a satellite (106) which demodulates the uplink data stream to produce a demodulated uplink data stream consisting of 1 to N user channels (230). The method uses a first multiplexer (232) to produce 1 to M multiplexed data signals (234) which are fed into quality encoders (236). The quality encoders (236) encode the multiplexed data signals (234) according to a selected quality level to produce custom-coded data signals (238). The level of coding applied to the custom-coded data signals (238) may be controlled by information received by a channel measurement element (250). Next, the method passes the custom-coded data signals (238) into a second multiplexer (240) which produces one multiplexed data stream (242). The multiplexed data stream (242) is then fed into the satellite's modulator before transmission back to a ground receiver.
摘要翻译： 公开了一种使卫星下行链路信息速率最大化的方法。 地面发射机（102）将外部块码应用于数据信道，对其进行调制，并向上行链路数据流解调的卫星（106）发送上行链路数据流（104），以产生由1 到N个用户信道（230）。 该方法使用第一多路复用器（232）产生被馈送到质量编码器（236）中的1到M个多路复用数据信号（234）。 质量编码器（236）根据所选择的质量等级对复用的数据信号（234）进行编码，以产生定制编码的数据信号（238）。 应用于定制编码数据信号（238）的编码电平可以由信道测量元件（250）接收的信息来控制。 接下来，该方法将自定义编码数据信号（238）传递到产生一个复用数据流（242）的第二多路复用器（240）。 然后将复用的数据流（242）送回卫星的调制器，然后传送回地面接收机。
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公开(公告)号：US06625776B1
公开(公告)日：2003-09-23
申请号：US09163775
申请日：1998-09-30
IPC分类号： H03M1300
CPC分类号： H04L1/0065 , H04L1/0009 , H04L1/0015 , H04L1/0025
摘要： The present invention provides a comprehensive method for controlling, independently, transmit power and coding levels for data transmitted in uplinks and downlinks. One preferred embodiment of the present invention provides a method for adaptive coding of data in a downlink. A data error rate associated with downlink data (e.g., a character error rate provided by a Reed Solomon decoder) is determined. The method, based upon pre-established error rate thresholds, controls the level of coding (e.g., heavy or light) on data in the downlink to achieve a desired data error rate. Heavy coded data is typically associated with a code rate half that of light coded data, and changes between heavy and light coding may be selected using a destination address applied at an originating terminal and interpreted at the satellite.
摘要翻译： 本发明提供了一种用于独立地控制在上行链路和下行链路中传输的数据的发送功率和编码电平的综合方法。 本发明的一个优选实施例提供了一种用于下行链路中的数据的自适应编码的方法。 确定与下行链路数据相关联的数据错误率（例如，由里德所罗门解码器提供的字符错误率）。 该方法基于预先建立的错误率阈值来控制下行链路中的数据上的编码（例如重或轻）的水平以实现期望的数据错误率。 重编码数据通常与光编码数据的码率相关联，并且可以使用在始发终端处应用并在卫星处解释的目的地地址来选择重和轻编码之间的变化。
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6.发明授权Downlink transmission and reception techniques for a processing communication satellite 有权用于处理通信卫星的下行链路传输和接收技术公开(公告)号：US06512749B1
公开(公告)日：2003-01-28
申请号：US09408041
申请日：1999-09-29
IPC分类号： H04B7185
CPC分类号： H04B7/18515
摘要： Communication satellite downlink transmitting and reception techniques includes circuitry which groups a predetermined number of data cells with a predetermined error correction code to generate frame bodies. The circuitry also groups the frame bodies with header symbols and trailer symbols to generate data frames. One or more modulators enable the placement of the modulated data frames into a plurality of frequency bands having a predetermined frequency range and a predetermined transmission rate. One or more antennas transmit the modulated data frames over one or more beams with different forms of polarization to other antennas. A demodulator is connected to demodulate the radio carrier signals and the beams into data frames from a plurality of frequency bands. Decoders are connected to decode the frame bodies with header symbols and with trailer symbols from the data frames and to decode four data cells as a group by using a predetermined error correction code.
摘要翻译： 通信卫星下行链路发射和接收技术包括以预定的纠错码对预定数量的数据信元进行分组以产生帧体的电路。 电路还将帧体与头部符号和尾部符号分组以产生数据帧。 一个或多个调制器使得能够将经调制的数据帧放置在具有预定频率范围和预定传输速率的多个频带中。 一个或多个天线将具有不同形式的偏振的一个或多个波束上的经调制的数据帧发射到其他天线。 连接解调器，将无线电载波信号和波束解调成来自多个频带的数据帧。 连接解码器以用头部符号和来自数据帧的尾标符号对帧体进行解码，并通过使用预定的纠错码将四个数据信元解码为一组。
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7.发明授权Uplink transmission and reception techniques for a processing satelliteation satellite 有权用于处理卫星卫星的上行链路传输和接收技术公开(公告)号：US06466569B1
公开(公告)日：2002-10-15
申请号：US09408331
申请日：1999-09-29
IPC分类号： H04Q1104
CPC分类号： H04B7/18513
摘要： Uplink transmission and reception techniques for a processing satellite including one or more earth terminals 400 connected to receive ATM data cells. One or more encoders 418 are connected to coordinate four data cells with an error correction code to generate data bursts and to coordinate the data bursts with synchronizing bursts to generate data frames. One or more modulators 420 are connected to modulate the data frames by frequency division multiple access modulation to enable placement of the modulated data frames into a plurality of channels. One or more antennas 406 transmit the modulated data frames to a satellite 100 over 48 beams with various forms of polarization. In satellite 100, a receiving multibeam antenna and feed 106 responds to one or more beams of radiocarrier signals having one or more forms of polarization. One or more demodulators 138 demodulate the radio carrier signals into data frames from various channels including a plurality of channel types. One or more decoders 146 decode data bursts and synchronizing bursts from the data frames and decode four data cells from the bursts using error correction code.
摘要翻译： 用于包括连接到接收ATM数据单元的一个或多个接地端子400的处理卫星的上行链路传输和接收技术。 连接一个或多个编码器418以配置具有纠错码的四个数据单元，以产生数据脉冲串，并且以同步脉冲串协调数据脉冲以产生数据帧。 连接一个或多个调制器420以通过频分多址调制来调制数据帧，以便将调制的数据帧放置在多个信道中。 一个或多个天线406通过具有各种形式的偏振的48个波束将经调制的数据帧发射到卫星100.在卫星100中，接收多波束天线和馈送106响应于具有一个或多个形式的极化的一个或多个无线电载波信号波束 。 一个或多个解调器138将无线电载波信号解调为包括多个信道类型的各种信道的数据帧。 一个或多个解码器146解码数据突发并且从数据帧中同步脉冲串，并使用纠错码从脉冲串中解码四个数据信元。
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公开(公告)号：US6088416A
公开(公告)日：2000-07-11
申请号：US63799
申请日：1998-04-21
CPC分类号： H04B7/2041
摘要： A method for reducing interference and increasing spectral efficiency in a frequency reuse pattern (600) is disclosed. The method includes the steps of generating n original communications beams (302-308) assigned to substantially non-overlapping frequency bands, with the original communications beams extending over a first set of predetermined bandwidths. The method also generates n shifted communications beams (402-408) shifted by an orthogonal frequency separation from the n original communications beams (302-308), with the n shifted communications beams (402-408) extending over a second set of predetermined bandwidths. The method projects the n original communications beams (302-308) and the n shifted communications beams (402-408) in a frequency reuse pattern (600) over a region of interest by alternating the n original communications beams (302-308) with the n shifted communications beams (402-408).
摘要翻译： 公开了一种用于减少频率复用模式（600）中的干扰并提高频谱效率的方法。 该方法包括产生分配给基本上非重叠频带的n个原始通信波束（302-308）的步骤，原始通信波束在第一组预定带宽上延伸。 该方法还生成从N个原始通信波束（302-308）移位正交频率分离的n个移位通信波束（402-408），其中n个移位通信波束（402-408）在第二组预定带宽 。 该方法通过将n个原始通信波束（302-308）交替设置，在n个原始通信波束（302-308）和n个移动的通信波束（402-408）中以频率重用模式（600）在所关注的区域上投射， n个移位的通信波束（402-408）。
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公开(公告)号：US06865166B1
公开(公告)日：2005-03-08
申请号：US09187370
申请日：1998-11-06
CPC分类号： H04B7/18532
摘要： A satellite based cellular communications system (10) for servicing multiple user terminals (14) is provided. The satellite based cellular communications system (10) includes at least one processing communications satellite (12) which supports communications uplinks (16) and communications downlinks (18) between multiple user terminals (14). A network operations center (24) having a central control processor (26) communicates with the processing communication satellite (12) on the communications uplinks (16) and the communications downlinks (18). The central control processor (26) minimizes intra-system interference between the multiple user terminals (14) by allocating a connection parameter to each user terminal (14) based upon accessing a plurality of communication system parameters.
摘要翻译： 提供了一种用于维修多个用户终端（14）的基于卫星的蜂窝通信系统（10）。 基于卫星的蜂窝通信系统（10）包括支持多个用户终端（14）之间的通信上行链路（16）和通信下行链路（18）的至少一个处理通信卫星（12）。 具有中央控制处理器（26）的网络操作中心（24）在通信上行链路（16）和通信下行链路（18）上与处理通信卫星（12）进行通信。 中央控制处理器（26）通过基于访问多个通信系统参数向每个用户终端（14）分配连接参数来最小化多个用户终端（14）之间的系统内干扰。
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10.发明授权Cellular satellite communication system and method for controlling antenna gain pattern therein 有权蜂窝卫星通信系统及其中控制天线增益模式的方法公开(公告)号：US06188896B1
公开(公告)日：2001-02-13
申请号：US09255175
申请日：1999-02-22
申请人： Eldad Perahia , Donald C. Wilcoxson
发明人： Eldad Perahia , Donald C. Wilcoxson
IPC分类号： H04B7185
CPC分类号： H04B7/18515
摘要： A satellite-based telecommunication system is provided which communicates with earth-based users located within a predetermined communications area. The communications areas have an associated interference pattern. A satellite antenna is controlled to form an antenna gain pattern distributed across the communications area. The antenna gain pattern represents the gain at any given point within the communications area. The interference pattern corresponds to the amount of interference associated with each point within the communications area. A method and apparatus are provided for controlling the gain defined by a transmitter and/or receiver of a satellite. The transmitter/receiver produces a desired antenna gain pattern. The preferred embodiment includes determining an interference pattern associated with a communications area of interest. Once the interference pattern is identified, a desired antenna gain pattern is then identified. It is preferable that the antenna gain pattern conform to the interference pattern for the communications area.
摘要翻译： 提供了一种基于卫星的电信系统，其与位于预定通信区域内的基于地球的用户进行通信。 通信区域具有相关联的干扰模式。 控制卫星天线以形成分布在通信区域上的天线增益模式。 天线增益模式表示通信区域内任何给定点处的增益。 干扰模式对应于与通信区域内的每个点相关联的干扰量。 提供了一种用于控制由卫星的发射机和/或接收机定义的增益的方法和装置。 发射机/接收机产生所需的天线增益模式。 优选实施例包括确定与感兴趣的通信区域相关联的干扰模式。 一旦识别出干扰图案，则识别出期望的天线增益模式。 优选地，天线增益模式符合通信区域的干扰模式。
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