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公开(公告)号：US20240106525A1
公开(公告)日：2024-03-28
申请号：US18523052
申请日：2023-11-29
发明人： Liping Chen , Rohit Iyer Seshadri , Mustafa Eroz , Lin-Nan Lee , Stan Kay
CPC分类号： H04B7/18513 , H04L1/0005 , H04L27/364
摘要： Various arrangements for performing transmodulation of a forward feeder link are presented. A first data stream and a second data stream can be modulated into a higher-order modulation forward feeder link having a higher-order digital modulation scheme. A satellite can receive the higher-order modulation forward feeder link. The satellite can demodulate the higher-order modulator forward feeder link into a bit stream. This bit stream may then be remodulated and retransmitted as multiple forward user links.
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公开(公告)号：US20230141927A1
公开(公告)日：2023-05-11
申请号：US18148100
申请日：2022-12-29
发明人： Lin-Nan Lee , Udaya Bhaskar
CPC分类号： H04B7/18513 , H04B7/18515 , H04L45/64
摘要： Various arrangements for a satellite-based forward link overlay are presented herein. In some embodiments, broadband data is modulated at a particular frequency, phase, and/or timing to create a broadband data signal. The frequency, phase, and/or timing are used to modulate a low-bandwidth data signal. The low-bandwidth data signal can then be combined with the broadband data signal and transmitted via satellite to a geographic region. A low-bandwidth receiver unit may determine the frequency, phase, and/or timing from the embedded broadband signal and use such information to demodulate and despread the low-bandwidth data signal.
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公开(公告)号：US10237016B2
公开(公告)日：2019-03-19
申请号：US15374418
申请日：2016-12-09
摘要： A receiver, transmitter and system are programmed to communicate based on a signal including a plurality of signal components associated respectively with a plurality of subcarriers over a communications channel. The receiver is programmed to determine, from the plurality of subcarriers, a subcarrier subject to interference and erase the signal component associated with the subcarrier subject to interference. The receiver is further programmed to reconstruct the signal based on the plurality of first signal components excluding the erased first signal component.
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公开(公告)号：US20180115390A1
公开(公告)日：2018-04-26
申请号：US15374418
申请日：2016-12-09
CPC分类号： H04L1/0041 , H03M13/1105 , H03M13/1165 , H04B7/185 , H04B7/18519 , H04B7/1858 , H04B7/18582 , H04L1/0045 , H04L1/0047 , H04L1/0057 , H04L1/0058
摘要： A receiver, transmitter and system are programmed to communicate based on a signal including a plurality of signal components associated respectively with a plurality of subcarriers over a communications channel. The receiver is programmed to determine, from the plurality of subcarriers, a subcarrier subject to interference and erase the signal component associated with the subcarrier subject to interference. The receiver is further programmed to reconstruct the signal based on the plurality of first signal components excluding the erased first signal component.
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公开(公告)号：US09924482B2
公开(公告)日：2018-03-20
申请号：US15185016
申请日：2016-06-16
发明人： Lin-Nan Lee , Liping Chen , Victor Liau
CPC分类号： H04W56/005 , H04B1/69 , H04B1/7105 , H04J13/0003 , H04J13/0029 , H04L25/03872 , H04W12/10 , H04W74/0833 , H04W74/085
摘要： A communications terminal receives a data communications signal via a random access channel. A processor searches for data bursts in a first time-slot that include one of a first set of signature sequences assigned to the first time-slot. When a data burst A in the first time-slot includes one of the first set of signature sequences, the data burst A in the first time-slot is an initial burst of a message from a first communications terminal. The processor determines whether a second time-slot includes a data burst B that includes the one signature sequence. When the second time-slot includes the data burst B, the message is a multi-burst message and that the data burst B is a second burst of the multi-burst message. When the second time-slot does not include the data burst B the message is a single-burst message that has been completed via the first time-slot.
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公开(公告)号：US09768858B2
公开(公告)日：2017-09-19
申请号：US14845921
申请日：2015-09-04
发明人： Chi-Jiun Su , Lin-Nan Lee
IPC分类号： H04B7/185 , H04L1/18 , H04L12/721 , H04L1/00
CPC分类号： H04B7/18528 , H04L1/0057 , H04L1/1867 , H04L45/70 , H04L2001/0093
摘要： A method for efficient retransmission over a satellite network including transmitting data packets to VSATs, receiving retransmission requests for at least one of the data packets from the VSATs, generating a retransmission packet based on the retransmission requests using XOR summing, transmitting the retransmission packet to the plurality of VSATs.
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7.发明授权System and method for pre-distortion and iterative compensation for nonlinear distortion in system employing FTN symbol transmission rates 有权采用FTN符号传输速率的系统中非线性失真的预失真和迭代补偿的系统和方法公开(公告)号：US09515723B2
公开(公告)日：2016-12-06
申请号：US14955007
申请日：2015-11-30
发明人： Bassel Beidas , Rohit Iyer Seshadri , Mustafa Eroz , Lin-Nan Lee
CPC分类号： H04B7/18517 , H03F1/3241 , H04B1/0475 , H04B2001/0425
摘要： A signal transmission approach comprises encoding a source signal (comprising source symbols) to generate a corresponding encoded signal. The encoded signal is modulated by mapping each source symbol to a respective signal constellation point of an applied signal constellation to generate a modulated signal. The modulated signal is pre-distorted based on a distortion estimate to generate a pre-distorted signal. The pre-distorted signal is filtered to generate a filtered signal. The filtered signal is frequency translated and amplified to generate a transmission signal for transmission via an uplink channel of a satellite communications system. To increase throughput, the source signal is processed through the apparatus and the resulting transmission signal is generated at a Faster-than-Nyquist (FTN) symbol rate and with a tight frequency roll-off. The modulated signal is pre-distorted based on a distortion estimate relating to the nonlinearity and the filters applied before and/or after the pre-distorter.
摘要翻译： 信号传输方法包括编码源信号（包括源符号）以产生对应的编码信号。 通过将每个源符号映射到所施加的信号星座的相应信号星座点来调制编码信号以产生调制信号。 调制信号基于失真估计被预失真以产生预失真信号。 预失真信号被滤波以产生滤波信号。 经滤波的信号被频率转换和放大以产生用于经由卫星通信系统的上行链路信道传输的传输信号。 为了增加吞吐量，通过装置处理源信号，并且以更快的奈奎斯特（FTN）符号速率和严格的频率滚降产生所得到的传输信号。 基于与非线性相关的失真估计和在预失真器之前和/或之后应用的滤波器，调制信号被预失真。
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公开(公告)号：US20150381268A1
公开(公告)日：2015-12-31
申请号：US14845921
申请日：2015-09-04
发明人： Chi-Jiun Su , Lin-Nan Lee
IPC分类号： H04B7/185 , H04L12/721
CPC分类号： H04B7/18528 , H04L1/0057 , H04L1/1867 , H04L45/70 , H04L2001/0093
摘要： A method for efficient retransmission over a satellite network including transmitting data packets to VSATs, receiving retransmission requests for at least one of the data packets from the VSATs, generating a retransmission packet based on the retransmission requests using XOR summing, transmitting the retransmission packet to the plurality of VSATs.
摘要翻译： 一种通过卫星网络有效重传的方法，包括向VSAT发送数据分组，从VSAT接收至少一个数据分组的重传请求，根据使用XOR求和的重传请求生成重传分组，将重传分组发送给 多个VSAT。
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9.发明授权System and method for pre distortion and iterative compensation for nonlinear distortion in system employing FTN symbol transmission rates 有权采用FTN符号传输速率的系统中非线性失真的预失真和迭代补偿的系统和方法公开(公告)号：US09203450B2
公开(公告)日：2015-12-01
申请号：US14510080
申请日：2014-10-08
发明人： Bassel Beidas , Rohit Iyer Seshadri , Mustafa Eroz , Lin-Nan Lee
CPC分类号： H04B7/18517 , H03F1/3241 , H04B1/0475 , H04B2001/0425
摘要： A signal transmission approach comprises encoding a source signal (comprising a plurality of source symbols) to generate a corresponding encoded signal. The encoded signal is modulated by mapping each source symbol to a respective signal constellation point of an applied signal constellation to generate a modulated signal. The modulated signal is pre-distorted based on a distortion estimate to generate a pre-distorted signal. The pre-distorted signal is filtered to generate a filtered signal. The filtered signal is frequency translated and amplified to generate a transmission signal for transmission via an uplink channel of a satellite communications system. To increase throughput, the source signal is processed through the apparatus and the resulting transmission signal is generated at a Faster-than-Nyquist (FTN) symbol rate and with a tight frequency roll-off. The modulated signal is pre-distorted based on a distortion estimate relating to the nonlinearity and the filters applied before and/or after the pre-distorter.
摘要翻译： 信号传输方法包括对源信号（包括多个源符号）进行编码以产生对应的编码信号。 通过将每个源符号映射到所施加的信号星座的相应信号星座点来调制编码信号以产生调制信号。 调制信号基于失真估计被预失真以产生预失真信号。 预失真信号被滤波以产生滤波信号。 经滤波的信号被频率转换和放大以产生用于经由卫星通信系统的上行链路信道传输的传输信号。 为了增加吞吐量，通过装置处理源信号，并且以更快的奈奎斯特（FTN）符号速率和严格的频率滚降产生所得到的传输信号。 基于与非线性相关的失真估计和在预失真器之前和/或之后应用的滤波器，调制信号被预失真。
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公开(公告)号：US11444686B2
公开(公告)日：2022-09-13
申请号：US17137269
申请日：2020-12-29
发明人： Liping Chen , Rohit Iyer Seshadri , Mustafa Eroz , Lin-Nan Lee , Stan Kay
摘要： Various arrangements for performing transmodulation of a forward feeder link are presented. A first data stream and a second data stream can be modulated into a higher-order modulation forward feeder link having a higher-order digital modulation scheme. A satellite can receive the higher-order modulation forward feeder link. The satellite can demodulate the higher-order modulator forward feeder link into a bit stream. This bit stream may then be remodulated and retransmitted as multiple forward user links.
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