公开(公告)号：US20190158342A1

公开(公告)日：2019-05-23

申请号：US16313840

申请日：2017-06-21

申请人： LG ELECTRONICS INC.

发明人： Kilbom LEE ,  Kyuseok KIM ,  Kijun KIM ,  Minki AHN

IPC分类号： H04L27/38 ,  H04L27/36 ,  H04L27/34

CPC分类号： H04L27/389 ,  H04L5/0048 ,  H04L27/34 ,  H04L27/3438 ,  H04L27/364 ,  H04L27/38 ,  H04L27/3863

摘要： A method by which a base station transmits a reference signal in a wireless communication system can comprise the steps of: transmitting, to a terminal, information on a modulation method of a reference signal for estimating a phase difference between symbols in a time domain; and transmitting, to the terminal, the reference signal, for estimating the phase difference between the symbols, to which the modulation method is applied.

公开(公告)号：US20020031190A1

公开(公告)日：2002-03-14

申请号：US09887490

申请日：2001-06-22

发明人： Lior Ophir ,  Naftali Sommer ,  Ofir Shalvi

IPC分类号： H04L005/12

CPC分类号： H04L1/005 ,  H04L1/0042 ,  H04L1/006 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/3411 ,  H04L27/3433 ,  H04L27/3438

摘要： A technique that combines a turbo trellis coded modulation (TTCM) coding scheme with constellation shaping and precoding schemes to implement a binary coded communication system and method that can achieve high performance (high coding gains achieved in combination with shaping gain, and when necessary, also with high performance in ISI-channels via preceding).

摘要翻译： 一种将turbo网格编码调制（TTCM）编码方案与星座整形和预编码方案相组合的技术，以实现二进制编码通信系统和方法，该系统和方法可以实现高性能（结合增益获得高编码增益，并且在必要时还可以实现） 通过前面的ISI通道具有高性能）。

公开(公告)号：US5442626A

公开(公告)日：1995-08-15

申请号：US110906

申请日：1993-08-24

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H03M13/00 ,  H03M13/23 ,  H04J7/00 ,  H04L1/00 ,  H04L25/03 ,  H04L27/34 ,  H04J11/00

CPC分类号： H04L1/0065 ,  H04J7/00 ,  H04L1/0057 ,  H04L1/006 ,  H04L25/03044 ,  H04L27/3427 ,  H04L27/3438

摘要： A cost-effective, bandwidth-efficient, and power-efficient system is provided in which data streams received from several different video sources are converted into sequences of symbols selected from a predetermined constellation and are multiplexed on a symbol-by-symbol basis into a single sequence of symbols for transmission on a channel. Using a symbol multiplexer helps to mitigate the effect of bursty noise in the receiver and reduces the processing speed requirement in the receiver.

摘要翻译： 提供了一种具有成本效益，带宽效率和功率效率的系统，其中从多个不同视频源接收的数据流被转换成从预定星座中选择的符号序列，并且逐个符号地被复用到 用于在信道上传输的单个符号序列。 使用符号多路复用器有助于减轻接收机中突发噪声的影响，并降低接收机中的处理速度要求。

公开(公告)号：US5311547A

公开(公告)日：1994-05-10

申请号：US829820

申请日：1992-02-03

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H04L25/03 ,  H04L25/497 ,  H04L27/34 ,  H04N7/015 ,  H04N7/26 ,  H04L25/34 ,  H04L25/49

CPC分类号： H04L25/4975 ,  H04L25/03343 ,  H04L25/497 ,  H04L27/3438

摘要： Digital data is transmitted over partial-response channels using a precoding technique which allows for the use of a wide variety of transmit constellations. A sequence of signal points is selected from a predetermined base constellation meeting particular criteria. A so-called combined signal point is developed for a present symbol interval by a) selecting a signal point from the base constellation as a function of input bits associated with the present symbol interval and b) combining the signal point thus selected with a feedback signal which is a function of one or more combined signal points that were developed for previous symbol intervals, that function being determined by the characteristic of the partial-response channel. A transmit signal which represents the combined signal points is then provided. In one implementation, the processing steps are performed explicitly using an integrated precoder/constellation mapper. In another implementation those steps are performed implicitly using table look-up.

摘要翻译： 使用允许使用各种传输星座的预编码技术，通过部分响应信道发送数字数据。 从满足特定标准的预定基座星座选择信号点序列。 针对当前的符号间隔开发所谓的组合信号点，该方法是：a）从基本星座中选择一个信号点作为与当前符号间隔相关联的输入位的函数，以及b）将所选择的信号点与反馈信号 其是针对先前符号间隔开发的一个或多个组合信号点的函数，其功能由部分响应信道的特性确定。 然后提供表示组合信号点的发送信号。 在一个实现中，使用集成的预编码器/星座映射器来明确地执行处理步骤。 在另一个实现中，这些步骤使用表查找隐式地执行。

公开(公告)号：US5113411A

公开(公告)日：1992-05-12

申请号：US560389

申请日：1990-07-31

申请人： Atsushi Yoshida ,  Hisashi Oishi

发明人： Atsushi Yoshida ,  Hisashi Oishi

IPC分类号： H04L27/00 ,  H04L27/34 ,  H04L27/38

CPC分类号： H04L27/3438

摘要： A MODEM has a delay equalizer for receiving a trellis-coded test signal transmitted from an opposite MODEM and compensating for delay distortion of this test signal on the transmission path. The output of this delay equalizer and the input test signal are selectively entered into a demodulator. The output of this demodulator is assigned to predetermined signal point coordinates by a decision circuit. A Viterbi decoder computes a branch metric representing the distance between each assigned point and receive signal point from the output signals of the decision circuit and the demodulator, and figures out the pass metrics of accumulated values based on the branch metrics so computed. A difference signal represents the difference between the maximum and minimum values of the pass metrics from the Viterbi decoder. A first difference signal corresponds to the pass metrics when the delay equalizer is not set for the transmission path, and a second difference signal corresponds to the pass metrics when the delay equalizer is set for the transmission path. A control circuit compares the first and second difference signals and sets the delay equalizer out of the transmission path if the first difference signal is greater than the second, or sets the delay equalizer in the transmission path if the second difference signal is greater than the first. Thus the MODEM automatically decides whether the delay equalizer is to be inserted in the transmission path.

摘要翻译： MODEM具有延迟均衡器，用于接收从相对的MODEM发送的网格编码的测试信号，并补偿该测试信号在传输路径上的延迟失真。 该延迟均衡器的输出和输入测试信号被选择性地输入到解调器中。 该解调器的输出通过判定电路被分配给预定的信号点坐标。 维特比解码器根据决策电路和解调器的输出信号计算表示每个分配点和接收信号点之间的距离的分支度量，并根据所计算的分支度量计算出累积值的通过量度。 差分信号表示来自维特比解码器的通过度量的最大值和最小值之间的差。 当延迟均衡器未被设置用于传输路径时，第一差分信号对应于通过度量，并且当为传输路径设置延迟均衡器时，第二差分信号对应于通过量度。 如果第一差分信号大于第二差分信号，则控制电路比较第一和第二差分信号，并将延迟均衡器设置在传输路径之外，或者如果第二差分信号大于第一差分信号，则将延迟均衡器设置在传输路径中 。 因此，MODEM自动地确定延迟均衡器是否被插入到传输路径中。

公开(公告)号：US4716385A

公开(公告)日：1987-12-29

申请号：US889804

申请日：1986-07-23

申请人： Seiichi Noda ,  Makoto Yoshimoto

发明人： Seiichi Noda ,  Makoto Yoshimoto

IPC分类号： H03M13/25 ,  H03M13/45 ,  H04L1/00 ,  H04L27/34 ,  H03K7/00 ,  H03K9/00

CPC分类号： H03M13/25 ,  H03M13/251 ,  H04L1/0057 ,  H04L27/3411 ,  H04L27/3416 ,  H04L27/3438

摘要： In a multilevel modulator for use in modulating an input digital signal of N levels into a multilevel modulated signal, the input digital signal is converted by a code converting unit into a major converted signal for the input digital signal and a minor converted signal corresponding to the major converted signal. The major converted signal is rearranged into groups each of which consists of a predetermined number of levels smaller than N and which is produced in a time division fashion together with with minor converted signal. A signal producing unit processes each group to produce a Lee-error correcting code sequence. Alternatively, major and minor converted signals are produced on quadrature-phase amplitude modulation of a circular signal arrangement of N-levels to divide the circular signal arrangement into a square signal arrangement and the remaining signal arrangement. In a counterpart multilevel demodulator, an inverse operation is carried out to reproduce the input digital signal.

摘要翻译： 在用于将N电平的输入数字信号调制成多电平调制信号的多电平调制器中，输入数字信号由码转换单元转换成用于输入数字信号的主转换信号和对应于 主要转换信号。 主转换信号被重新排列成组，每个组由预定数量的小于N的电平组成，并且与次转换信号一起以时分方式产生。 信号产生单元处理每个组以产生一个错误纠错码序列。 或者，主要和次要转换的信号在N电平的圆形信号布置的正交相位幅度调制上产生，以将圆形信号布置分成平方信号布置和剩余的信号布置。 在对应的多电平解调器中，执行逆运算以再现输入数字信号。

公开(公告)号：US4713829A

公开(公告)日：1987-12-15

申请号：US746538

申请日：1985-06-19

申请人： Vedat M. Eyuboglu

发明人： Vedat M. Eyuboglu

IPC分类号： H03M13/25 ,  H04L1/00 ,  H04L25/03 ,  H04L27/34 ,  H04L27/00

CPC分类号： H04L1/0052 ,  H03M13/25 ,  H04L1/0054 ,  H04L1/0058 ,  H04L1/0065 ,  H04L25/03057 ,  H04L27/3438

摘要： A receiver for deciding which signal points were sent from a transmitter based on corresponding noise affected signals received via a distorting channel, the noise affected signals carrying information about a particular sequence of encoding states occupied in a succession of time intervals by a finite state process having a finite number of possible encoding states, the receiver including modifying circuitry for generating a plurality of different modified versions of each received signal, and a decoder for deciding which signal points were sent based on estimating a particular sequence of decoder states by storing a number of path histories of previous signal points and using the modified versions to extend the path histories, the different modified versions of each received signal numbering fewer than the number of stored path histories. In other aspects, the constellation of signal points is partitioned into decision subsets, each possible transitions from a possible decoder state are associated with a decision subset, based on the signal points in the path histories, and each of the modified versions is associated with one of the decision subsets; there are fewer modified versions than the number of decoder states; and the decoder states number fewer than the number of decoder states in an optimum trellis decoder.

摘要翻译： 一种接收机，用于基于经由失真信道接收到的相应的噪声影响信号来决定哪些信号点从发射机发送，所述噪声影响信号携带有关具有一段时间间隔的特定的编码状态序列的信息，所述有限状态过程具有 有限数量的可能的编码状态，所述接收机包括用于产生每个接收到的信号的多个不同修改版本的修改电路，以及解码器，用于基于通过存储多个编码状态来估计解码器状态的特定序列来决定哪些信号点被发送 先前信号点的路径历史，并使用修改版本来扩展路径历史，每个接收信号的不同修改版本的编号少于存储的路径历史数。 在其他方面，信号点的星座被划分为决策子集，根据路径历史中的信号点，从可能的解码器状态的每个可能的转变与决策子集相关联，并且每个修改版本与一个相关联 的决策子集; 比解码器状态数量少的修改版本; 并且解码器的状态数量少于最佳网格解码器中的解码器状态的数量。

公开(公告)号：US4713817A

公开(公告)日：1987-12-15

申请号：US727398

申请日：1985-04-25

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H03M13/25 ,  H04L1/00 ,  H04L27/34 ,  H04L27/36 ,  H04L27/38 ,  G06F11/10

CPC分类号： H04L1/0058 ,  H03M13/25 ,  H04L1/0052 ,  H04L1/0054 ,  H04L1/0065 ,  H04L1/0072 ,  H04L27/3438

摘要： A family of multi-dimensional convolutionally coded modulation systems achieves enlarged minimum distance between possible sequences of signal points, reduced number of error events with the minimum distance, acceptable peak-to-average power ratio, reduced number of signal points in each constituent two-dimensional constellation, immunity to rapid carrier phase changes, and reduced complexity, resulting in a reduced error probability when maximum likelihood decoding is used.These advantages are achieved by the construction and by the partitioning into subsets of the multi-dimensional constellation, by the design of convolutional codes using those multi-dimensional subsets, by using a bit converter and a block encoder to convert a multi-dimensional constellation mapping into multiple two-dimensional constellations mappings, and by a simplified decoding technique.

公开(公告)号：US4660214A

公开(公告)日：1987-04-21

申请号：US761606

申请日：1985-08-01

申请人： Kaveh Pahlavan ,  Jerry L. Holsinger

发明人： Kaveh Pahlavan ,  Jerry L. Holsinger

IPC分类号： H04L27/34 ,  H04L27/02

CPC分类号： H04L27/3438 ,  H04L27/3411

摘要： A signal structure for high speed Trellis coded data communications selects each signal point in the structure to attain a low probability of error in the presence of both additive noise and multiplicative noise. Viterbi decoding is modified to take account of the multiplicative noise energy content of the received signal.

摘要翻译： 用于高速网格编码数据通信的信号结构选择结构中的每个信号点，以在存在加性噪声和乘法噪声的情况下获得低概率误差。 修改维特比解码以考虑接收信号的乘法噪声能量内容。

公开(公告)号：US4562426A

公开(公告)日：1985-12-31

申请号：US439740

申请日：1982-11-08

申请人： George D. Forney, Jr.

发明人： George D. Forney, Jr.

IPC分类号： H03M5/14 ,  H03M13/25 ,  H04L27/34

CPC分类号： H04L27/3438 ,  H03M13/25 ,  H03M5/145

摘要： In apparatus for transmitting digital symbols over a band-limited channel using a modulated carrier system by encoding the symbols into discrete signals selected by a finite state encoder from a signal alphabet comprised of subsets each corresponding to transitions from a particular previous state to a particular current state of the encoder, the improvement in which at least two of the subsets have a signal in common, and at least one signal belongs to only one of the two subsets.

摘要翻译： 在用于通过使用调制载波系统的频带限制信道上发送数字符号的装置中，通过将码元编码为由有限状态编码器选择的离散信号从包括子集的信号字母发送数字符号，每个子集对应于从特定先前状态到特定电流的转换 编码器的状态，其中至少两个子集具有共同信号的改进，并且至少一个信号仅属于两个子集中的一个。