公开(公告)号：US06473878B1

公开(公告)日：2002-10-29

申请号：US09451070

申请日：1999-11-30

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H03M1331

CPC分类号： H03M13/2703 ,  H03M13/256 ,  H03M13/258 ,  H03M13/2972 ,  H03M13/2993

摘要： Advantageous error rate performance, high bandwidth efficiency, low delay and reduced error floor are achieved at an acceptable level of decoding complexity via the use of serial concatenated turbo codes. These are codes for which at least some of the output bits, including at least one redundant bit, provided by a first, outer encoder are, after interleaving, further processed by a second, inner encoder. The resulting data and redundant bits then select a symbol from a predetermined constellation for transmission. In the receiver, the turbo code is decoded using a corresponding number of soft output decoders which operates iteratively in such a way that improved performance as compared to a single encoding can be achieved. The turbo codes can be of various dimensionalities and can be used as a component of a multilevel code to achieve a desired level of bandwidth efficiency.

摘要翻译： 通过使用串行级联turbo码，可以在可接受的解码复杂度水平上实现有利的错误率性能，高带宽效率，低延迟和降低的误码底层。 这些代码是由第一外部编码器提供的包括至少一个冗余位的至少一些输出位在交织之后进一步由第二内部编码器处理的代码。 所得到的数据和冗余位然后从预定的星座中选择一个符号进行传输。 在接收机中，使用相应数量的软输出解码器对turbo码进行解码，该解码器以可以实现与单个编码相比提高的性能的迭代操作。 turbo代码可以具有各种维度，并且可以用作多级代码的组件以实现期望的带宽效率水平。

公开(公告)号：US06233286B1

公开(公告)日：2001-05-15

申请号：US09049268

申请日：1998-03-27

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H04L2302

CPC分类号： H04L25/03235

摘要： Improved error rate performance of data transmissions systems using both coded and uncoded modulation in the presence of more-than-mild intersymbol interference is achieved in the receiver using M-path joint decision feedback equalizer/decoder in conjunction with a finer partition of the constellation than was used in the transmitter and a refined receiver trellis diagram based on that finer partition.

摘要翻译： 在接收机中使用M-path联合判决反馈均衡器/解码器结合星座的更精细分区，实现了在存在多于轻微的符号间干扰的情况下使用编码和未编码调制的数据传输系统的改进的差错率性能， 被用于发射机和基于更精细分区的精细接收机网格图。

公开(公告)号：US6151370A

公开(公告)日：2000-11-21

申请号：US23063

申请日：1998-02-12

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H04L25/03 ,  H04L27/34 ,  H04L27/06 ,  H04L23/02

CPC分类号： H04L25/03235 ,  H04L27/3422

摘要： A path-oriented approach is provided to determine surviving paths in a decoder. The paths that are retained as the surviving paths are some number, M, of the paths which have the smallest path metrics, even if two or more of those paths come into a given state. This approach provides significantly improved performance in at least those applications in which branch metrics are a function of the surviving path from which the branch emanates.

摘要翻译： 提供了一种面向路径的方法来确定解码器中的存活路径。 作为幸存路径保留的路径是具有最小路径度量的路径的一些数量M，即使这些路径中的两个或更多个进入给定状态。 这种方法在至少那些应用中提供了显着改进的性能，其中分支度量是分支发出的幸存路径的函数。

公开(公告)号：US5719875A

公开(公告)日：1998-02-17

申请号：US661511

申请日：1996-06-11

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H03M13/23 ,  H03M13/27 ,  H03M13/29 ,  H03M13/22

CPC分类号： H03M13/2732 ,  H03M13/23 ,  H03M13/29

摘要： A systematic convolutional interleaver arrangement that is obtained by treating the input signals of an associated error correcting encoder as if they had been pre-interleaved in a very particular way so that the order of the input signals of the encoder is not altered when it is transmitted to the channel. By way of example, an interleaver/deinterleaver arrangement is disclosed that uses Reed Solomon code RS(120,116) and employs delay element banks and associated routing to interleave and deinterleave the signals.

摘要翻译： 通过将相关联的纠错编码器的输入信号以非常特定的方式进行预交错处理来获得的系统卷积交织器布置，使得编码器的输入信号的顺序在发送时不被改变 到频道。 作为示例，公开了使用Reed Solomon码RS（120,116）并采用延迟元组和相关联的路由来对信号进行交织和解交织的交织器/解交织器装置。

公开(公告)号：US5706312A

公开(公告)日：1998-01-06

申请号：US840438

申请日：1997-03-31

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H04L27/00 ,  H03M13/23 ,  H03M13/25 ,  H03M13/29 ,  H04L1/00 ,  H04L27/34 ,  H04N5/44 ,  H04N21/2383 ,  H04N21/438 ,  H04L5/12 ,  H03M13/12

CPC分类号： H04L1/006 ,  H03M13/253 ,  H03M13/2936 ,  H04N21/2383 ,  H04N21/4382 ,  H03M13/1515 ,  H04N5/4401

摘要： Coding gain is improved by employing an N-dimensional trellis encoder incorporating an N'-dimensional convolutional encoder where N' is less than N. The additional coding gain is realized as a shaping gain. This unique modulator encodes a digital signal by generating a sequence of N-dimensional symbols as a function of the digital signal using an N'-dimensional convolutional encoder within the trellis encoder more than once (integer N/N' times) during each N-dimensional symbol interval. This allows the trellis encoder to produce an output of higher dimensionality than would normally be expected from the lower dimensionality convolutional encoder. The trellis encoder is applicable to television transmission.

摘要翻译： 通过采用纳入N'小于N的N维卷积编码器的N维网格编码器来提高编码增益。附加编码增益被实现为整形增益。 该唯一调制器通过在网格编码器期间多次（整数N / N'次）内的N维卷积编码器生成作为数字信号的函数的N维符号序列来编码数字信号， 三维符号间隔。 这允许网格编码器产生比通常从较低维度卷积编码器预期的更高维度的输出。 网格编码器适用于电视传输。

公开(公告)号：US5418798A

公开(公告)日：1995-05-23

申请号：US49739

申请日：1993-04-19

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H04L25/08 ,  H03M13/23 ,  H03M13/25 ,  H04L27/00 ,  H04L27/34 ,  G06F11/10 ,  H04L5/12

CPC分类号： H04L27/3438

摘要： A trellis-coded modulation system is provided in which the output of the trellis encoder is used to select a subset of a multidimensional QAM constellation. The selection process is performed such that a) the minimum square Euclidean distance between valid sequences of successive selected subsets is maximized, b) the resulting code is rotationally invariant, and c) the selected subset corresponding to a transition of the trellis encoder from a present state i to a different next state j is different from the selected subset that corresponds to a transition of the trellis encoder from a present state j to a next state i.

摘要翻译： 提供了网格编码调制系统，其中网格编码器的输出用于选择多维QAM星座的子集。 执行选择过程，使得a）连续选择的子集的有效序列之间的最小平方欧氏距离最大化，b）所得到的代码是旋转不变的，以及c）所选择的子集对应于网格编码器从现在 状态i到不同的下一状态j不同于对应于格状编码器从当前状态j到下一状态i的转换的所选子集。

公开(公告)号：US5329551A

公开(公告)日：1994-07-12

申请号：US869991

申请日：1992-04-16

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： G06F11/10 ,  H03M13/00 ,  H04L27/00 ,  H04L27/34 ,  H04L25/34 ,  H04L25/49

CPC分类号： H04L27/3433

摘要： A multilevel coded modulation scheme trellis encodes a portion of the input data and the resulting encoded stream is used to identify a particular one of a predetermined number of subsets of symbols of a predetermined signal constellation. The remaining input data is coded using a Reed-Solomon (RV) code whose output is used to select for transmission a particular symbol from the identified subset. In applications in which phase hits or other channel phenomena may cause the received signal points to be phase-rotated versions of the signal points that were transmitted, differential encoding is included in the overall coded modulation scheme. In different embodiments, the differential encoding/decoding and RV encoding/decoding are in different orders. In one such embodiment, overlapped multilevel codes are used to preserve the advantages afforded by taking a multilevel coding approach.

摘要翻译： 多级编码调制方案网格编码输入数据的一部分，并且所得到的编码流用于识别预定数量的预定信号星座符号子集中的特定一个。 剩余的输入数据使用Reed-Solomon（RV）码进行编码，其输出用于从所识别的子集中选择传输特定符号。 在相位匹配或其他通道现象可能导致接收到的信号点被发送的信号点的相位旋转版本的应用中，差分编码被包括在总体编码调制方案中。 在不同的实施例中，差分编码/解码和RV编码/解码是不同的顺序。 在一个这样的实施例中，使用重叠的多级代码来保持采用多级编码方法所提供的优点。

公开(公告)号：US5301209A

公开(公告)日：1994-04-05

申请号：US773828

申请日：1991-10-09

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H04B7/26 ,  H04L27/18 ,  H04L5/12 ,  H04L23/02

CPC分类号： H04L27/186

摘要： The decoding depth of a multidimensional trellis-coding scheme with X-fold time diversity is reduced, or minimized. As a result, an improvement in error rate performance is achieved for the multidimensional trellis code, which can then be favorably applied to a fading channel application.

摘要翻译： 减少或最小化具有X倍时间分集的多维网格编码方案的解码深度。 结果，对于多维网格码实现了错误率性能的改善，其可以有利地应用于衰落信道应用。

公开(公告)号：US5243629A

公开(公告)日：1993-09-07

申请号：US753491

申请日：1991-09-03

申请人： Lee-Fang Wei

发明人： Lee-Fang Wei

IPC分类号： H03M13/00 ,  H04B14/04 ,  H04J1/00 ,  H04L27/26 ,  H04N7/015 ,  H04N7/08 ,  H04N21/2383 ,  H04N21/438

CPC分类号： H04N21/2383 ,  H04L27/2604 ,  H04N21/4382 ,  H04N7/015 ,  H04N7/0806

摘要： A high definition television (HDTV) signal is transmitted by a multi-subcarrier transmission scheme in which each subcarrier is used to carry a different class of HDTV information.

公开(公告)号：US5214656A

公开(公告)日：1993-05-25

申请号：US627156

申请日：1990-12-13

申请人： Hong Y. Chung ,  Jin-Der Wang ,  Lee-Fang Wei

发明人： Hong Y. Chung ,  Jin-Der Wang ,  Lee-Fang Wei

IPC分类号： H04B14/04 ,  H03M13/35 ,  H04L1/00 ,  H04L27/34 ,  H04N5/44 ,  H04N7/015 ,  H04N7/24 ,  H04N19/89

CPC分类号： H04L1/006 ,  H03M13/35 ,  H04L1/0003 ,  H04L1/0017 ,  H04L1/0065 ,  H04L1/0071 ,  H04L27/0008 ,  H04L27/3422 ,  H04L27/3427 ,  H04N19/89 ,  H04N5/4401 ,  H04N7/015 ,  H04N7/24 ,  H04L2001/0098 ,  H04N19/30

摘要： Unequal error protection is provided for an HDTV signal by separately coding each one of the classes of information in the HDTV signal by using a conventional coded modulation scheme and then time-division-multiplexing the various coded outputs for transmission. In particular, each class of information is separately coded by a 4-dimensional 8-state trellis code and a uniformly-spaced (QAM) signal constellation.