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1. 发明公开

EP3155776A4 MULTICARRIER SUCCESSIVE PREDISTORTION FOR DIGITAL TRANSMISSION 有权
公开(公告)号：EP3155776A4
公开(公告)日：2018-02-21
申请号：EP15806065
申请日：2015-06-12
申请人： HUGHES NETWORK SYSTEMS LLC
发明人： BEIDAS BASSEL , SESHADRI ROHIT IYER , BECKER NEAL
IPC分类号： H03F1/32 , H03F3/195 , H03F3/24 , H03F3/68 , H04B1/04 , H04L25/03 , H04L27/36
CPC分类号： H03F3/195 , H03F1/3241 , H03F1/3247 , H03F1/3258 , H03F3/245 , H03F3/68 , H03F2200/111 , H03F2201/3236 , H04B1/0475 , H04B2001/0425 , H04L25/03343 , H04L27/2626
摘要： An approach for improved compensation for nonlinear distortion in multicarrier satellite systems is provided. Source reflecting encoded and modulated sequences of source data symbols are received. Each source signal is predistorted, and a transmit filter is applied to each predistorted source signal. Each filtered signal is translated to a carrier frequency, and the translated signals are combined into a composite signal for transmission via a multicarrier transponder. The final predistorted version of each source signal is generated via an iterative process of a number of stages, wherein, for a given stage and for each source signal, the process comprises: receiving a prior predistorted version of each source signal from a preceding stage; processing each prior predistorted source signal based on all of the received prior predistorted source signals, wherein the processing is performed based on a characterization of one or more characteristics of the multicarrier satellite transponder.

2. 发明公开

EP3055962A4 SYSTEM AND METHOD FOR PRE-DISTORTION AND ITERATIVE COMPENSATION FOR NONLINEAR DISTORTION IN SYSTEM EMPLOYING FTN SYMBOL TRANSMISSION RATES 有权
标题翻译：系统和方法的侧重点与FTN符号传输速率补偿和反复的非线性失真系统中的
公开(公告)号：EP3055962A4
公开(公告)日：2017-06-14
申请号：EP14853035
申请日：2014-10-08
申请人： HUGHES NETWORK SYSTEMS LLC
发明人： BEIDAS BASSEL , SEHADRI ROHIT LYER , EROZ MUSTAFA , LEE LIN-NAN
IPC分类号： H04B1/04 , H04B7/185
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：一种信号传输方法包括编码的源信号（包括源符号的多元性），以产生相应的编码信号。该编码信号是通过每一个源符号映射到在施加的信号星座中的信号respectivement星座点，以产生调制信号调制。经调制的信号是预失真基于失真估计，以生成一预失真信号。该预失真信号进行滤波，以产生经滤波的信号。经滤波的信号的频率转换和放大通过在卫星通信系统中的上行链路信道，以生成用于传输的传输信号。为了提高吞吐量，源信号通过装置处理，并在一个快于被生成的所得的发送信号奈奎斯特（FTN）的符号率，并用紧频率滚降。经调制的信号是预失真基于失真估计有关的非线性和之前和/或预失真后应用的滤波器。

3. 发明公开

EP3020173A4 SYSTEM AND METHOD FOR ITERATIVE COMPENSATION FOR LINEAR AND NONLINEAR INTERFERENCE IN SYSTEM EMPLOYING FTN SYMBOL TRANSMISSION RATES 有权
标题翻译：系统和方法的线性和非线性问题迭代补偿系统中的带符号FTN传输速率
公开(公告)号：EP3020173A4
公开(公告)日：2017-03-22
申请号：EP14822126
申请日：2014-07-08
申请人： HUGHES NETWORK SYSTEMS LLC
发明人： BEIDAS BASSEL , SESHADRI ROHIT LYER , EROZ MUSTAFA , LEE LIN-NAN
IPC分类号： H04L25/40 , H04L1/00 , H04L25/03 , H04L25/497
CPC分类号： H04L25/03006 , H04L1/0048 , H04L1/005 , H04L1/0054 , H04L25/0314 , H04L25/03165 , H04L25/03834 , H04L25/497
摘要： An approach for increasing transmission throughput of a non-linear wireless channel, and efficient decoding of the transmitted signal via a simplified receiver, is provided. A signal reflects a source signal, and includes linear inter-symbol interference based on a faster-than-Nyquist signaling rate and a tight frequency roll-off, and non-linear interference based on high-power amplification for transmission over the wireless channel. The signal is received over a non-linear wireless channel, and is processed via a plurality of decoding iterations. A set of soft information of a current decoding iteration is generated based on a current estimate of the source signal and a final set of soft information from a previous decoding iteration. The current estimate of the source signal is based on an estimate of the linear ISI and the non-linear interference, which is based on the final set of soft information from the previous decoding iteration.

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