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1. 发明申请

US20160034421A1 DIGITAL PRE-DISTORTION AND POST-DISTORTION BASED ON SEGMENTWISE PIECEWISE POLYNOMIAL APPROXIMATION 审中-公开
标题翻译：基于分段多项式逼近的数字预失真和失败
公开(公告)号：US20160034421A1
公开(公告)日：2016-02-04
申请号：US14449326
申请日：2014-08-01
申请人： INFINEON TECHNOLOGIES AG
发明人： Thomas Magesacher , Peter Singerl , Martin Mataln , Christian Schuberth
IPC分类号： G06F17/11 , G06F17/50
CPC分类号： G06F17/11 , G06F17/17 , G06F17/5009 , H03F1/3247 , H03F1/3258 , H03F2201/3233 , H04B10/2507 , H04B2210/252 , H04B2210/254 , H04L27/3427 , H04L27/368
摘要： A nonlinear distorter is configured to mitigate nonlinearity from a nonlinear component of a nonlinear system. The nonlinear distorter operates to model the nonlinearity as a function of a piecewise polynomial approximation applied to segments of a nonlinear function of the nonlinearity. The nonlinear distorter generates a model output that decreases the nonlinearity of the nonlinear component.
摘要翻译：非线性变阻器被配置为从非线性系统的非线性分量减轻非线性。非线性变异器用于将非线性模型作为应用于非线性的非线性函数的分段的分段多项式近似的函数。非线性损耗器产生一个减小非线性分量非线性的模型输出。

2. 发明申请

US20110033009A1 System and Method for Adapting a Change in Constellation Density While Receiving a Signal 有权
标题翻译：接收信号时适应星座密度变化的系统和方法
公开(公告)号：US20110033009A1
公开(公告)日：2011-02-10
申请号：US12908325
申请日：2010-10-20
申请人： William L. Betts
发明人： William L. Betts
IPC分类号： H04L27/00
CPC分类号： H04L1/0006 , H04L25/03343 , H04L27/3427 , H04L2025/0342
摘要： One embodiment comprises a transmitter precoder operating on an input signal to produce an output signal for modulation. The output signal is transmitted using a constellation with a constellation density. The transmitter precoder comprises scaler logic, precoder logic and selection logic. The scaler logic scales the input signal to maintain constant power on the input signal independent of the constellation density. The precoder logic precodes the scaled signal to produce a dither signal limited to a range of values. The range is inversely proportional to the constellation density. The selection logic is operable in two states. In the first state, the selection logic combines the scaled signal with the dither signal to produce the output signal. In the second state, the selection provides the scaled signal as the output signal.
摘要翻译：一个实施例包括对输入信号进行操作以产生用于调制的输出信号的发射器预编码器。使用星座密度的星座传输输出信号。发射机预编码器包括缩放器逻辑，预编码器逻辑和选择逻辑。缩放器逻辑将输入信号缩放以保持输入信号上的恒定功率，而与星座密度无关。预编码器逻辑预处理缩放的信号以产生限于一定范围值的抖动信号。该范围与星座密度成反比。选择逻辑可在两种状态下操作。在第一状态下，选择逻辑将经缩放的信号与抖动信号组合以产生输出信号。在第二状态下，选择提供缩放信号作为输出信号。

3. 发明授权

US07515642B2 LDPC (Low Density Parity Check) coded 128 DSQ (Double Square QAM) constellation modulation and associated labeling 失效
标题翻译： LDPC（低密度奇偶校验）编码128 DSQ（双方QAM）星座调制和相关标签
公开(公告)号：US07515642B2
公开(公告)日：2009-04-07
申请号：US11211210
申请日：2005-08-25
申请人： Gottfried Ungerboeck , Ba-Zhong Shen , Scott Richard Powell , Kelly Brian Cameron , Hau Thien Tran
发明人： Gottfried Ungerboeck , Ba-Zhong Shen , Scott Richard Powell , Kelly Brian Cameron , Hau Thien Tran
IPC分类号： H04L5/12
CPC分类号： H03M13/255 , H03M13/11 , H04L25/4975 , H04L27/3405 , H04L27/3427
摘要： LDPC (Low Density Parity Check) coded 128 DSQ (Double Square QAM) constellation modulation and its associated labeling. A novel means is introduced by which a constellation may be arranged and mapping in its symbols may be determined to provide for improved performance. One application area in which this may be employed is transmission over twisted pair (typically copper) cabling existent within data centers of various networks. The operation of the IEEE 802.3 Ethernet local area networks currently being used (as well as those currently under development) would benefit greatly by employing the various principles presented herein. When this novel approach of an LDPC coded 128 DSQ constellation modulation combined with TH (Tomlinson-Harashima) preceding is employed within a communication device at a transmitter end of a communication channel (i.e., in a transmitter and/or a transceiver), the overall operation of a communication system may improve significantly when compared to prior techniques.
摘要翻译： LDPC（低密度奇偶校验）编码128 DSQ（双方QAM）星座调制及其相关标签。引入了一种新颖的装置，通过该装置可以布置星座，并且可以确定其符号中的映射以提供改进的性能。可以采用这种方式的一个应用领域是在各种网络的数据中心内存在的双绞线（通常为铜缆）布线。目前正在使用的IEEE 802.3以太网局域网（以及目前正在开发中的那些）的运行将通过采用本文呈现的各种原理而受益匪浅。当在通信信道（即，在发射机和/或收发机）的发射机端的通信设备内采用与TH（Tomlinson-Harashima）组合的LDPC编码的128个DSQ星座调制的新颖方法时，与现有技术相比，通信系统的操作可以显着改善。

4. 发明授权

US07187728B2 Coding method and use of a receiver with a convolutional decoder 有权
标题翻译：具有卷积解码器的接收机的编码方法和使用
公开(公告)号：US07187728B2
公开(公告)日：2007-03-06
申请号：US10204299
申请日：2001-02-23
申请人： Udo Seier , Joerg-Martin Mueller , Andreas Engel
发明人： Udo Seier , Joerg-Martin Mueller , Andreas Engel
IPC分类号： H04L5/12 , H04L23/02 , H04L27/06 , H04L27/20 , H03D1/00 , H03D3/00 , H03C3/00
CPC分类号： H04L27/3427
摘要： A coding method for modulating carrier signals with 16 different digital states (4 bit signals) possesses a high synchronicity robustness and an at least partially improved coding gain. The coding parameters are obtained by the following steps: a) using a 2 ASK/8 PSK coding; b) choosing a convolutional code and determining all possible code word sequences with the free distance of the convolutional code; c) producing possible mappings by allocating a partial quantity of the 2 ASK/8 PSK channel bits to subsets; d) choosing the mapping at which, after determination of the optimum radii of the two amplitudes for every possible mapping, the resulting minimum Euclidean distance takes a maximum value between two possible subset sequences code word sequence.
摘要翻译：用于调制具有16种不同数字状态（4位信号）的载波信号的编码方法具有高同步性鲁棒性和至少部分改进的编码增益。编码参数通过以下步骤获得：a）使用2个ASK / 8PSK编码; b）选择卷积码并用卷积码的自由距离确定所有可能的码字序列; c）通过将2个ASK / 8PSK信道位的部分量分配给子集来产生可能的映射; d）选择映射，在确定每个可能映射的两个幅度的最佳半径之后，所得到的最小欧几里德距离在两个可能的子集序列码字序列之间取最大值。

5. 发明授权

US07027528B2 Timing recovery using the pilot signal in high definition TV 有权
标题翻译：使用高分辨率电视中的导频信号进行定时恢复
公开(公告)号：US07027528B2
公开(公告)日：2006-04-11
申请号：US10895579
申请日：2004-07-21
申请人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe
发明人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe
IPC分类号： H04L27/14
CPC分类号： H04N5/21 , H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/455 , H04N5/46 , H04N11/002
摘要： Improved carrier recovery and symbol timing systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system is disclosed. Carrier and symbol timing acquisition and tracking loops are phase/frequency locked to an inserted pilot signal provided in an input VSB spectrum at a given frequency. An input spectrum is centered about baseband and the pilot is extracted by an equivalent filter which functions as a bandpass filter having pass bands centered about the pilot frequency. Since the pilot signal's frequency is given, its position in the frequency domain for any sampling frequency, is deterministic. The receiver's sampling frequency is provided such that the relationship is expressed as fc=fS/4. When tracked by a phase-lock loop, the pilot signal will appear at the correct location in the spectrum if the sampling frequency fS is correct, and will be shifted in one direction or the other if the sampling frequency fS is too high or too low.
摘要翻译：公开了适用于双模QAM / VSB接收机系统的改进的载波恢复和符号定时系统和方法。载波和符号定时采集和跟踪环路被相位/频率锁定到在给定频率下在输入VSB频谱中提供的插入导频信号。输入频谱以基带为中心，并且通过等效滤波器提取导频，该等效滤波器用作具有以导频频率为中心的通带的带通滤波器。由于给出了导频信号的频率，所以在频域中对于任何采样频率的位置是确定性的。提供了接收机的采样频率，使得该关系被表示为f / c = f S / S / 4。当通过锁相环路进行跟踪时，如果采样频率f S S S正确，则导频信号将出现在频谱中的正确位置，并且如果采样频率f S S太高或太低。

6. 发明申请

US20040264499A1 Re-mapping trellis encoded data associated with a 2-bit constellation tone to data associated with a pair of 1-bit constellation tones 失效
标题翻译：将与2位星座音调相关联的网格编码数据重新映射到与一对1位星座音调相关联的数据
公开(公告)号：US20040264499A1
公开(公告)日：2004-12-30
申请号：US10609731
申请日：2003-06-30
发明人： Jong-Kae Fwu
IPC分类号： H04L012/56
CPC分类号： H04L27/3427 , H04L27/2602
摘要： According to some embodiments, Trellis encoded data associated with a 2-bit constellation tone is re-mapped to data associated with a pair of 1-bit constellation tones.
摘要翻译：根据一些实施例，将与2位星座音调相关联的网格编码数据重新映射到与一对1比特星座音调相关联的数据。

7. 发明申请

US20040196897A1 Technique for minimizing decision feedback equalizer wordlength in the presence of a DC component 有权
标题翻译：在DC分量存在的情况下，最小化决策反馈均衡器字长的技术
公开(公告)号：US20040196897A1
公开(公告)日：2004-10-07
申请号：US10830827
申请日：2004-04-23
申请人： Broadcom Corporation
发明人： Loke Kun Tan , Tian-Min Liu , Hing "Ada" T. Hung
IPC分类号： H04B001/10 , H03K005/159
CPC分类号： H04N5/46 , H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/21 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N11/002
摘要： A system for reducing the complexity of an adaptive decision feedback equalizer, for use in connection with a dual-mode QAM/VSB receiver system is disclosed. QAM and VSB symbols, which are expressed in two's compliment notation, include an extra bit required to compensate for a fixed offset term introduced by the two's compliment numbering system. A decision feedback equalizer includes a decision feedback filter section which operates on symbolic decisions represented by a wordlength which excludes the added bit representing the offset. The vestigal word is convolved with the decision feedback filter's coefficients, while a DC component, corresponding to the excluded bit, is convolved with the same coefficient values in a correction filter. The two values are summed to provide an ISI compensation signal at the input of a decision device such as a slicer. A DC component representing a pilot tone in VSB transmission systems also introduces a DC component, and additional bits, to a VSB wordlength. These additional bits are similarly excluded and the vestigal representation convolved with coefficient values in a decision feedback filter. The DC component, including the pilot tone representation, is convolved with the same coefficient values in a correction filter.
摘要翻译：公开了一种用于降低自适应判决反馈均衡器的复杂性的系统，用于与双模式QAM / VSB接收机系统相结合。以二进制符号表示的QAM和VSB符号包括补偿由二进制编号系统引入的固定偏移项所需的额外位。判决反馈均衡器包括判定反馈滤波器部分，其对由字长表示的符号决定进行操作，该字长不包括表示偏移量的相加位。遗留词与决策反馈滤波器的系数进行卷积，而对应于排除比特的DC分量与校正滤波器中的相同系数值进行卷积。将两个值相加以在诸如限幅器的决定装置的输入处提供ISI补偿信号。表示VSB传输系统中的导频音的DC分量还将DC分量和附加比特引入VSB字长。类似地排除这些附加位，并且在判决反馈滤波器中与系数值卷积的残余表示。包括导频音表示的DC分量在校正滤波器中与相同的系数值进行卷积。

8. 发明授权

US06775334B1 Equalization and decision-directed loops with trellis demodulation in high definition TV 有权
公开(公告)号：US06775334B1
公开(公告)日：2004-08-10
申请号：US09433733
申请日：1999-11-03
申请人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe
发明人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe
IPC分类号： H03D100
CPC分类号： H04L27/3827 , H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/21 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/46 , H04N11/002
摘要： Improved decision feedback equalizer and decision directed timing recovery systems and methods suitable for use in connection with a dual mode QAM/VSB receiver system are disclosed. A trellis decoder operates in conjunction with a decision feedback equalizer circuit on trellis coded 8-VSB modulated signals. The trellis decoder includes a 4-state traceback memory circuit outputting a maximum likelihood decision as well as a number of intermediate decisions based upon the maximum likelihood sequence path. Any number of decisions, along the sequence, may be provided as an input signal to timing recovery system loops, with the particular decision along the sequence chosen on the basis of its delay through the trellis decoder. Variable delay circuitry is coupled to the other input of the timing recovery system loops in order to ensure that both input signals bear the same timestamp. Final decisions are output from the trellis decoder to a DFE in order to enhance the DFE's ability to operate in low SNR environments. A decision sequence estimation error signal is also generated and used to drive the tap updates of both the DFE and an FFE portion of the equalizer.

9. 发明授权

US06704368B1 Coding and modulation method and apparatus for its implementation 失效
标题翻译：编码和调制方法及其实现方法
公开(公告)号：US06704368B1
公开(公告)日：2004-03-09
申请号：US09198213
申请日：1998-11-23
申请人： Nikolai Nefedov
发明人： Nikolai Nefedov
IPC分类号： H04L2302
CPC分类号： H04L1/0066 , H04L1/0041 , H04L1/005 , H04L1/0065 , H04L1/0068 , H04L1/0071 , H04L27/3427
摘要： For conveying coded digital information in the form of multiple-valued symbols from a transmitter to a receiver, the steps of a) encoding digital information in a Hybrid Concatenated Code encoder (501), b) mapping the encoded digital information into multiple-valued symbols in a Multi-Level Coding encoder (511, 512a-d, 513, 514), c) transmitting the multiple-valued symbols, d) receiving the multiple-valued symbols, and e) decoding the received multiple-valued symbols in a Multi-Stage Decoder (800) are employed.
摘要翻译：为了将多值符号形式的编码数字信息从发射机传送到接收机，a）在混合级联码编码器（501）中对数字信息进行编码的步骤，b）将编码的数字信息映射到多值符号中的多值符号多级编码编码器（511,512a-d，513,514），c）发送所述多值符号，d）接收所述多值符号，以及e）在多级符号中解码所接收的多值符号解码器（800）被采用。

10. 发明申请

US20030058967A1 Phase detectors in carrier recovery for offset QAM and VSB 有权
公开(公告)号：US20030058967A1
公开(公告)日：2003-03-27
申请号：US10288833
申请日：2002-11-06
申请人： Broadcom Corporation
发明人： Thuji S. Lin , Tian-Min Liu , Stephen E. Krafft
IPC分类号： H04L005/12 , H04L023/02 , H04L025/00 , H04L007/00 , H03D003/24 , H03D003/18
CPC分类号： H04N5/21 , H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/455 , H04N5/46 , H04N11/002
摘要： Improved carrier recovery, symbol timing, and carrier phase tracking systems and methods suitable for use in connection with a dual-mode QAM/VSB receiver system are disclosed. Carrier and phase recovery systems operate on complex signals representing symbols having the same time stamp for each phase error term. in-phase signals are sampled twice a symbol at the in-phase symbol sampling time and at the quadrature-phase symbol sampling time. The signals are de-multiplexed to generate I and XI data streams, where I represents the in-phase sampling time signals and XI represents mid-symbol point sample times. A similar procedure is carrier out on quadrature-phase signals. When the in-phase signal is de-multiplexed to generate a symbol I, the quadrature-phase signal is de-multiplexed to generate its mid-symbol point XQ. Both I and Q are decoded in a decision device to define a symbol error term, which is combined with the opposite mid-symbol signal to define a phase error term PI and PQ for each rail. In both cases, the symbol (I) decision (null), and mid-symbol (XQ) in each phase error term (PI) computation will have the same prime index.

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