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1. 发明授权

US07012937B2 Method and apparatus for tracking a synchronization signal 有权
公开(公告)号：US07012937B2
公开(公告)日：2006-03-14
申请号：US09768728
申请日：2001-01-24
申请人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
发明人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
IPC分类号： H04J3/06
CPC分类号： H04J3/0611 , H04B7/2125 , H04J3/0605 , H04L7/0004 , H04L7/043 , H04L7/10
摘要： A method and system for tracking a time division multiplexed synchronization signal in a satellite communication system is provided. The signal is provided as a series of frames with beacon signals time division multiplexed into at least one time slot of each frame. The beacon signal in each frame comprises a unique word sequence, which is the same in each frame, and a portion of a PN sequence. The entire PN sequence is distributed into a plurality of frames forming a superframe. Frequency variations of the incoming signal are tracked at the satellite terminal by correlating the PN sequence of the incoming signal against early and late locally generated versions of the PN sequence in a discriminate circuit. The output of the discriminate is provided to a delay locked loop circuit of at least third order. The output of the loop is used to adjust the frequency of the VCO, which clocks the A/D converter operating on the incoming signal. The product of the PN sequence of the incoming signal and an on-time locally generated version of the PN sequence is provided to an FFT circuit. The satellite terminal determines if it is locked onto the incoming signal based on the output of the FFT. If the satellite terminal is not locked, the terminal returns to an acquisition mode.

2. 发明授权

US07042854B2 Method and apparatus for acquiring a synchronization signal 有权
公开(公告)号：US07042854B2
公开(公告)日：2006-05-09
申请号：US09768726
申请日：2001-01-24
申请人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
发明人： Bassel Beidas , Olga Ritterbush , Stanley Kay , Yezdi Antia , Bala Subramaniam
IPC分类号： H04B7/212
CPC分类号： H04J3/0611 , H04B7/2125 , H04L7/0004
摘要： A method and system for acquiring a time division multiplexed synchronization signal in a satellite communication system is provided. The signal is provided as a series of frames with beacon signals time division multiplexed into at least one time slot of each frame. The beacon signal in each frame comprises a unique word sequence, which is the same in each frame, and a portion of a PN sequence. The entire PN sequence is distributed into a plurality of frames forming a superframe. Initially, the power level of the incoming signal is determined by locating the maximum power received in half time slot intervals. Next a series of frames are correlated against the expected unique word, each at one of a plurality of possible frequencies. The frequency generating the maximum correlation with the unique word is selected. The frequency is fine tuned by comparing the actual arrival time of the unique word in each frame with the estimated arrival time based on the current frequency, and adjusting the frequency accordingly. Also, the start of the superframe is located by correlating the PN sequence portion of each beacon signal against a known PN sequence until a match is found. Once the frequency offset is reduced below a threshold value, and the start of the PN sequence of the incoming signal is located, acquisition is completed.

3. 发明授权

US06487251B1 System and method for performing combined multi-rate convolutional coding 有权
标题翻译：用于执行组合多速率卷积编码的系统和方法
公开(公告)号：US06487251B1
公开(公告)日：2002-11-26
申请号：US09386053
申请日：1999-08-30
申请人： Yezdi Antia , Zhen-Liang Shi , A. Roger Hammons, Jr. , Olga Ritterbush
发明人： Yezdi Antia , Zhen-Liang Shi , A. Roger Hammons, Jr. , Olga Ritterbush
IPC分类号： H04L2701
CPC分类号： H04L1/0068 , H04L1/0041 , H04L1/007 , H04L1/08
摘要： A system and method for establishing an integrated forward error correction (FEC) scheme to perform multi-rate encoding on different priority data bits of a channel access message transmitted on a random access channel between devices of a communications network, such as between an access terminal and a base station of a satellite-based communications network. The channel access message includes a first data group representing first information and a second data group representing second information, which is transmitted between an access terminal and a base station in a satellite-based communications network. The system and method encodes the second data group at an encoding rate to provide a second encoded data group, and encodes the first data group at the same encoding rate to provide a first encoded data group. The encoding of the first and second data groups is performed by a single encoder, such as a rate ¼ convolutional encoder. The second encoded data group is transmitted from the access terminal to the base over a random access channel. The second encoded data group further can be punctured during transmission to in effect decrease its coding rate, for example, to rate ½ coding. The first encoded data group is transmitted from the access terminal to the base station, and is then retransmitted from the access terminal to the base station to in effect increase the rate of coding of the first encoded data group to, for example, ⅛ coding. At the base station, a combiner/demodulator combines the transmitted and retransmitted first encoded data group, and the combined first encoded data groups and the second encoded data group are then decoded by a decoder.
摘要翻译：一种用于建立综合前向纠错（FEC）方案的系统和方法，用于对通信网络的设备之间在诸如接入终端之间的随机接入信道上发送的信道接入消息的不同优先级数据比特执行多速率编码以及基于卫星的通信网络的基站。信道接入消息包括表示第一信息的第一数据组和表示在基于卫星的通信网络中的接入终端和基站之间传输的第二信息的第二数据组。该系统和方法以编码速率对第二数据组进行编码以提供第二编码数据组，并以相同的编码速率对第一数据组进行编码以提供第一编码数据组。第一和第二数据组的编码由单个编码器执行，例如速率¼卷积编码器。第二编码数据组通过随机接入信道从接入终端发送到基站。第二编码数据组在传输期间还可以被打孔，从而实际上降低了其编码率，例如，对1/2编码进行速率估计。第一编码数据组从接入终端发送到基站，然后从接入终端重传到基站，实际上将第一编码数据组的编码速率提高到例如1/8 编码。在基站，组合器/解调器组合发送和重传的第一编码数据组，然后由解码器解码组合的第一编码数据组和第二编码数据组。

4. 发明授权

US10819419B2 Timing synchronization for a beam hopping satellite 有权
公开(公告)号：US10819419B2
公开(公告)日：2020-10-27
申请号：US16518363
申请日：2019-07-22
申请人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar
发明人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar
IPC分类号： H04B7/185 , H04B7/204 , H04L7/00 , H04B7/06 , H04W72/04 , H04L27/26 , H04W28/18
摘要： A system and method for timing synchronization of satellite switching instants with gateway switching instants is described. The method includes: generating satellite switching instants according to a Beam Hopping Time Plan (BHTP); generating gateway switching instants according to the BHTP; transmitting a channel addressed to a plurality of beams hopped according to the BHTP based on the gateway switching instants, wherein each of the plurality of beams includes a signal including timing markers and a guard period at an end of the signal for the respective beam; receiving a synchronization information, without a loopback beam, for one of the plurality of beams; determining an adjustment period and an adjusted symbol rate for the generating of the gateway switching instants, based on the synchronization information, for a transmission of the channel such that at least a portion of the guard period in a respective signal for a respective beam aligns with one of the satellite switching instants; and adjusting a timing and a symbol rate of the transmission according to the adjustment period and the adjusted symbol rate, respectively.

5. 发明授权

US10361772B2 Timing synchronization for a beam hopping satellite 有权
公开(公告)号：US10361772B2
公开(公告)日：2019-07-23
申请号：US15914021
申请日：2018-03-07
申请人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar
发明人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar
IPC分类号： H04B7/185 , H04L27/26 , H04W72/04 , H04W28/18 , H04B7/204 , H04B7/06 , H04L7/00
摘要： A system and method for timing synchronization of satellite switching instants with gateway switching instants is described. The method includes: generating satellite switching instants according to a Beam Hopping Time Plan (BHTP); generating gateway switching instants according to the BHTP; transmitting a channel addressed to a plurality of beams hopped according to the BHTP based on the gateway switching instants, wherein each of the plurality of beams includes a signal including timing markers and a guard period at an end of the signal for the respective beam; receiving a synchronization information, without a loopback beam, for one of the plurality of beams; determining an adjustment period and an adjusted symbol rate for the generating of the gateway switching instants, based on the synchronization information, for a transmission of the channel such that at least a portion of the guard period in a respective signal for a respective beam aligns with one of the satellite switching instants; and adjusting a timing and a symbol rate of the transmission according to the adjustment period and the adjusted symbol rate, respectively.

6. 发明授权

US10694479B2 Timing synchronization with a modified DVB-S2X waveform for a beam hopping satellite 有权
公开(公告)号：US10694479B2
公开(公告)日：2020-06-23
申请号：US15914058
申请日：2018-03-07
申请人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar , Seokho Kim
发明人： Murali Regunathan , Yezdi Antia , Neal David Becker , Stanley Kay , Uday R. Bhaskar , Seokho Kim
IPC分类号： H04W16/28 , H04W72/04 , H04W56/00 , H04B7/06 , H04B7/185
摘要： A system and method for timing synchronization with a modified DVB-S2X waveform for a forward beam hopping satellite is described. The method includes: transmitting a channel including a plurality of beams per a Beam Hopping Time Plan (BHTP), wherein each beam includes a discontinuous signal including a superframe including timing markers and a Beam Hopping Forward Synchronization Pattern (BHFSP); receiving a synchronization information, without a loopback beam, for one of the plurality of beams; determining an adjustment period and an adjusted symbol rate for generation of terrestrial switching instants, based on the synchronization information, for a transmission of the plurality of beams such that at least a portion of a respective BHFSP of one of the beams aligns with one of satellite switching instants; and adjusting a timing and symbol rate of the transmission according to the adjustment period and the adjusted symbol rate, respectively.

7. 发明授权

US08711759B2 Frame timing synchronization in a geostationary satellite system 有权
标题翻译：地球静止卫星系统中的帧定时同步
公开(公告)号：US08711759B2
公开(公告)日：2014-04-29
申请号：US13538119
申请日：2012-06-29
申请人： Udaya R. Bhaskar , Yezdi Antia , Satyajit Roy
发明人： Udaya R. Bhaskar , Yezdi Antia , Satyajit Roy
IPC分类号： H04B7/185
CPC分类号： H04B7/2048 , H04B7/18513 , H04B7/2125 , H04W56/001
摘要： Aspects of the invention provide a system and method to allow inroute frame timing synchronization without the aid of hub signal loopback or satellite ephemeris data. Furthermore, it allows tracking and compensating of the satellite motion to allow multiple remotes to use TDMA on the inroute frequencies, while minimizing the aperture. Two main techniques proposed are CLT and polling based approaches, which are used in combination for an optimum solution. In CLT based approach, hub transmits remote specific timing correction feedback messages on the outroute on as needed basis. In polling based approach, the remotes derive their timing based on a per-beam average delay estimate broadcast by the hub and a measured local delay specific to each outroute stream from a remote. An aspect of the invention uses triangulation method to determine satellite position. Furthermore, an aspect of the invention uses hub burst arrival method instead of polling approach.
摘要翻译：本发明的方面提供了一种系统和方法，其允许在无需集线器信号环回或卫星星历数据的帮助下进行帧定时同步。此外，它允许跟踪和补偿卫星运动，以允许多个遥控器在最小化孔径的同时使用TDMA在路由频率上。提出的两个主要技术是基于CLT和轮询的方法，它们被组合用于最佳解决方案。在基于CLT的方法中，集线器根据需要在远端传输远程特定定时校正反馈消息。在基于轮询的方法中，遥控器基于由集线器广播的每个波束的平均延迟估计和来自远程的每个外向流特定的测量的本地延迟导出其定时。本发明的一个方面使用三角测量方法来确定卫星位置。此外，本发明的一个方面使用集线器突发到达方法而不是轮询方法。

8. 发明申请

US20130315136A1 FRAME TIMING SYNCRHONIZATION IN A GEOSTATIONARY SATELLITE SYSTEM 有权
标题翻译：地球卫星系统中的帧时序同步
公开(公告)号：US20130315136A1
公开(公告)日：2013-11-28
申请号：US13538119
申请日：2012-06-29
申请人： Udaya R. Bhaskar , Yezdi Antia , Satyajit Roy
发明人： Udaya R. Bhaskar , Yezdi Antia , Satyajit Roy
IPC分类号： H04W88/04
CPC分类号： H04B7/2048 , H04B7/18513 , H04B7/2125 , H04W56/001
摘要： Aspects of the invention provide a system and method to allow inroute frame timing synchronization without the aid of hub signal loopback or satellite ephemeris data. Furthermore, it allows tracking and compensating of the satellite motion to allow multiple remotes to use TDMA on the inroute frequencies, while minimizing the aperture. Two main techniques proposed are CLT and polling based approaches, which are used in combination for an optimum solution. In CLT based approach, hub transmits remote specific timing correction feedback messages on the outroute on as needed basis. In polling based approach, the remotes derive their timing based on a per-beam average delay estimate broadcast by the hub and a measured local delay specific to each outroute stream from a remote. An aspect of the invention uses triangulation method to determine satellite position. Furthermore, an aspect of the invention uses hub burst arrival method instead of polling approach.
摘要翻译：本发明的方面提供了一种系统和方法，其允许在无需集线器信号环回或卫星星历数据的帮助下进行帧定时同步。此外，它允许跟踪和补偿卫星运动，以允许多个遥控器在最小化孔径的同时使用TDMA在路由频率上。提出的两个主要技术是基于CLT和轮询的方法，它们被组合用于最佳解决方案。在基于CLT的方法中，集线器根据需要在远端传输远程特定定时校正反馈消息。在基于轮询的方法中，遥控器基于由集线器广播的每个波束的平均延迟估计和来自远程的每个外向流特定的测量的本地延迟导出其定时。本发明的一个方面使用三角测量方法来确定卫星位置。此外，本发明的一个方面使用集线器突发到达方法而不是轮询方法。

9. 发明授权

US07043199B2 Uplink power control system for satellite communication system employing on-board satellite processing and fade estimation 有权
公开(公告)号：US07043199B2
公开(公告)日：2006-05-09
申请号：US09875607
申请日：2001-06-06
申请人： Jerry Dai , Stan Kay , Yezdi Antia , Zhenliang Shi , Anwer Khan , Gaguk Zakaria
发明人： Jerry Dai , Stan Kay , Yezdi Antia , Zhenliang Shi , Anwer Khan , Gaguk Zakaria
IPC分类号： H04B7/185
CPC分类号： H04B7/18543
摘要： An uplink power control system for terminals in a satellite communication system provides closed loop power control using feedback signals generated at a satellite. The satellite performs inter-beam routing of uplink signals from satellite terminals, and processing of uplink signals to generate terminal transmission-specific feedback information that is transmitted in downlink signals to the terminals. The satellite also generates a beacon signal. An uplink power control algorithm at each terminal uses the beacon signal and feedback data to adjust transmit power.

10. 发明授权

US09264675B2 System and method for multi-carrier multiplexing 有权
标题翻译：多载波复用的系统和方法
公开(公告)号：US09264675B2
公开(公告)日：2016-02-16
申请号：US13323467
申请日：2011-12-12
申请人： Yezdi Antia , Dave Roos , Neal Becker
发明人： Yezdi Antia , Dave Roos , Neal Becker
IPC分类号： H04L12/54 , H04N7/20
CPC分类号： H04N7/20
摘要： A system for a multiplexing scheme for wideband signals in a communications system is provided. A codeblock of a multiplexed datastream is decoded. The codeblock includes a flag indicating whether the codeblock contains a timeplan, signifying a multiplexing structure of the datastream. A determination is made whether the flag indicates the presence of the timeplan, and, if so, the timeplan is acquired. In response to a determination that the codeblock does not contain the timeplan, a subsequent codeblock is determined, and decoded. Each codeblock includes an indicator of a sequence position of the codeblock within a group of codeblocks of the datastream. The subsequent codeblock is determined based on one or more of a decode rate of the processor device and the sequence position indicator. A determination is made whether the flag of the subsequent codeblock indicates the presence of the timeplan, and, if so, the timeplan is acquired.
摘要翻译：提供了一种用于通信系统中的宽带信号的复用方案的系统。多路复用数据流的码块被解码。代码块包括指示代码块是否包含时钟表的标志，表示数据流的复用结构。确定标志是否表示是否存在timeplan，如果是，则获取该timeplan。响应于确定码块不包含时间延迟，确定并解码后续码块。每个码块包括在数据流的一组码块内的码块的序列位置的指示符。基于处理器设备的解码速率和序列位置指示符中的一个或多个确定随后的码块。确定后续代码块的标志是否指示timeplan的存在，如果是，则获取该timeplan。

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