公开(公告)号：EP0406507B1

公开(公告)日：1994-06-01

申请号：EP89810516.8

申请日：1989-07-07

申请人： International Business Machines Corporation

发明人： Chevillat, Pierre René, Dr. ,  Eleftheriou, Evangelos Stavros, Dr. ,  Maiwald, Dietrich Gerhard Ulrich, Dr.

IPC分类号： H04L27/00

CPC分类号： H04L27/3433 ,  H04L27/3477

公开(公告)号：EP0406507A1

公开(公告)日：1991-01-09

申请号：EP89810516.8

申请日：1989-07-07

申请人： International Business Machines Corporation

发明人： Chevillat, Pierre René, Dr. ,  Eleftheriou, Evangelos Stavros, Dr. ,  Maiwald, Dietrich Gerhard Ulrich, Dr.

IPC分类号： H04L27/00

CPC分类号： H04L27/3433 ,  H04L27/3477

摘要： In a trellis-coded modulation (TCM) transmission system, data bits are grouped into bit blocks (13), and each such bit block is encoded to select a fixed number w of symbols from a given symbol set (14). The symbols are subdivided into subsets, and each subset includes a few outer symbols and a greater number of inner symbols. Each symbol represents one particular transmission signal value. A first portion (17) of each bit block is separated into w bit subgroups, each of which is separately expanded by a convolutional encoder (20) to obtain a bit combination (19, 15) for specifying one of the symbol subsets. The remaining portion (21) of each bit block is expanded by a block coder (22) to obtain w bit subgroups (23), each being a bit combination (25, 16) for selecting one particular symbol out of a specified subset; outer symbols are selected less frequently than inner symbols (e.g. one outer symbol per bit block). The arrangement allows to transmit a non-integer number of data bits per symbol, and further allows to operate with single-symbol TCM, i.e. transmitting and decoding each symbol separately.

摘要翻译： 在网格编码调制（TCM）传输系统中，数据比特被分组成比特块（13），并且每个这样的比特块被编码以从给定的符号集合（14）中选择固定数量的符号。 符号被细分为子集，每个子​​集包括一些外部符号和更多个内部符号。 每个符号表示一个特定的传输信号值。 每个位块的第一部分（17）被分成w位子组，每个子组由卷积编码器（20）单独扩展，以获得用于指定符号子集之一的位组合（19,15）。 每个位块的剩余部分（21）由块编码器（22）扩展以获得w位子组（23），每个子组分别是用于从指定子集中选择一个特定符号的位组合（25,16） 选择外部符号比内部符号（例如，每位块的一个外部符号）频率更低。 该配置允许每个符号发送一个非整数个数据位，并且还允许以单符号TCM进行操作，即分别发送和解码每个符号。

公开(公告)号：EP0543070A1

公开(公告)日：1993-05-26

申请号：EP91810906.7

申请日：1991-11-21

申请人： International Business Machines Corporation

发明人： Cideciyan, Roy Daron, Dr. ,  Eleftheriou, Evangelos Stavros, Dr.

IPC分类号： H03M5/20 ,  H04L25/49 ,  G11B20/14

CPC分类号： G11B20/1496 ,  H03M5/20 ,  H04L25/4917

摘要： In digital data transmission and storage, binary data strings are encoded into symbols from a quaternary alphabet by a specific inventive use of finite-state machines. The novel, high-rate quaternary codes offer spectral shaping properties together with a significant increase in noise margin when used on channels which lend themselves to partial-response shaping. In principle, the encoding occurs in three steps: a u-state transition diagram (fig 2 ) generates quaternary symbols whose running digital sum assumes values from a given set; the u-state transition diagram is converted into a v-state machine (fig 3) each of the v states being associated with a number of transitions sufficient to encode the input data bytes into output code words; finally, the v-state machine is switched into a next state depending on its current state and the last encoded input data byte.

摘要翻译： 在数字数据传输和存储中，二进制数据串通过有限状态机的具体创造性使用从四进制字母表编码为符号。 新颖的高速四进制代码提供频谱整形特性，同时在用于部分响应成形的通道上使用时，噪声容限显着增加。 原则上，编码发生在三个步骤中：u状态转换图（图2）生成运行数字和假定来自给定集合的值的四进制符号; u状态转换图被转换成v状态机（图3），每个v状态与足以将输入数据字节编码为输出代码字的多个转换相关联; 最后，v状态机根据其当前状态和最后编码的输入数据字节切换到下一状态。