公开(公告)号：US6046629A

公开(公告)日：2000-04-04

申请号：US96455

申请日：1998-06-11

申请人： Toshiyuki Akiyama ,  Atsushi Miyashita ,  Seiichi Sano ,  Nobuo Tsukamoto ,  Shigeki Moriyama ,  Kenichi Tsuchida

发明人： Toshiyuki Akiyama ,  Atsushi Miyashita ,  Seiichi Sano ,  Nobuo Tsukamoto ,  Shigeki Moriyama ,  Kenichi Tsuchida

IPC分类号： H04L27/38 ,  H03D3/00

CPC分类号： H04L27/389

摘要： In a demodulating method of demodulating amplitude-demodulated signals in an amplitude phase shift keying system for conducting an amplitude modulation by setting signal points as information codes on a complex plane representing a signal space of transmission signals onto circumferences of two concentric circles including a first circle having a first diameter and a second circle having a second diameter smaller than the first diameter on the complex plane, there are obtained, in accordance with an amplitude value of an amplitude component of each symbol of a received amplitude-modulated signal, a first threshold value and a second threshold value having a predetermined relationship with the amplitude value. Next, the amplitude value the an amplitude component of each symbol of the successively received amplitude-modulated signal is compared with the first and second first threshold values to determine an amplitude variation in the amplitude component of each symbol in accordance with a result from the comparison so as to output therefrom a signal representing the determination result as a code obtained by demodulating the amplitude component.

摘要翻译： 在解调幅度相移键控系统中的幅度解调信号的解调方法中，用于通过将表示发送信号的信号空间的信号空间的信号点设置为信号点进行幅度调制，以将发送信号的信号空间设置在包括第一圆周的两个同心圆的周围 具有第一直径和第二直径小于复平面上的第一直径的第二直径，根据接收到的幅度调制信号的每个符号的振幅分量的振幅值，获得第一阈值 值和与振幅值具有预定关系的第二阈值。 接下来，将连续接收的幅度调制信号的每个符号的振幅分量的振幅值与第一和第二第一阈值进行比较，以根据比较结果确定每个符号的幅度分量的振幅变化 从而从其输出表示确定结果的信号作为通过解调幅度分量而获得的代码。

公开(公告)号：US5432800A

公开(公告)日：1995-07-11

申请号：US968406

申请日：1992-10-29

申请人： Toru Kuroda ,  Masafumi Saito ,  Shigeki Moriyama ,  Tomohiro Saito ,  Masayuki Takada ,  Osamu Yamada

发明人： Toru Kuroda ,  Masafumi Saito ,  Shigeki Moriyama ,  Tomohiro Saito ,  Masayuki Takada ,  Osamu Yamada

IPC分类号： H03M13/29 ,  H03M13/33 ,  H04L1/00 ,  H04L7/10 ,  G06F11/10

CPC分类号： H03M13/29 ,  H03M13/33 ,  H04L1/0083 ,  H04L7/10 ,  H04H2201/15

摘要： Method and apparatus for transmitting an information signal generate a plurality of block signals on the basis of the information signal, generate a plurality of parity block signals on the basis of the plural data block signals, generate a frame signal containing the plural data block signals and the parity block signals, and send out the frame signal. Each of the data block signals includes a first block synchronizing signal indicating the start of the data block signal, a data signal containing the information signal and a first parity signal derived by encoding the data signal. Each of the parity block signals incudes a second block synchronizing signal indicating the start of the parity block signal, a second parity signal and a third parity signal. Bit signals located at same bit positions in the respective second parity signals are derived by encoding bit signals located at the same positions in the respective data signals. Bit signals located at same bit positions in the respective third parity signals are derived by encoding the bit signals located at the same bit positions in the respective first parity signals or alternatively the third parity signal in each parity block signal is derived by encoding the second parity signal in each parity block signal.

摘要翻译： 用于发送信息信号的方法和装置基于信息信号产生多个块信号，根据多个数据块信号产生多个奇偶校验块信号，生成包含多个数据块信号的帧信号，以及 奇偶校验块信号，并发出帧信号。 每个数据块信号包括指示数据块信号的开始的第一块同步信号，包含信息信号的数据信号和通过对数据信号进行编码导出的第一奇偶校验信号。 每个奇偶校验块信号包括指示奇偶校验块信号的开始的第二块同步信号，第二奇偶校验信号和第三奇偶校验信号。 通过对位于相应数据信号中的相同位置的位信号进行编码，导出位于各个第二奇偶校验信号中相同位位置的位信号。 通过对位于相应的第一奇偶校验信号中的相同位位置的位信号进行编码，或者通过对第二奇偶校验位进行编码来导出每个奇偶校验块信号中的第三奇偶校验信号，导出位于相应的第三奇偶校验信号中位于相同位位置的位信号 信号在每个奇偶校验块信号。

公开(公告)号：US5406551A

公开(公告)日：1995-04-11

申请号：US9819

申请日：1993-01-27

申请人： Masafumi Saito ,  Toru Kuroda ,  Shigeki Moriyama ,  Tomohiro Saito ,  Masayuki Takada ,  Osamu Yamada

发明人： Masafumi Saito ,  Toru Kuroda ,  Shigeki Moriyama ,  Tomohiro Saito ,  Masayuki Takada ,  Osamu Yamada

IPC分类号： H04J1/20 ,  H04J11/00 ,  H04J99/00 ,  H04L27/26

CPC分类号： H04L27/2613 ,  H04L27/2657 ,  H04L27/34 ,  H04L27/2662 ,  H04L27/2675 ,  H04L5/0007 ,  H04L5/0048

摘要： A digital signal transmission using OFDM modulation scheme in which the valid transmission data can be reproduced without requiring a recovery of the carriers at a receiver side. On a transmitter side, the transmission data sequence in which predetermined reference data for each carrier are placed among valid transmission data is modulated according to an orthogonal frequency division multiplexing (OFDM) modulation scheme using a plurality of carriers and obtained OFDM transmission signals are transmitted. On a receiver side, the received OFDM transmission signals are demodulated to obtain received data sequence containing valid received data and received reference data, and the valid transmission data are estimated from the received data sequence according to the valid received data, the received reference data, and the predetermined reference data for each carrier.

摘要翻译： 使用OFDM调制方式的数字信号传输，其中可以再现有效的传输数据，而不需要在接收机侧恢复载波。 在发送机侧，根据使用多个载波的正交频分复用（OFDM）调制方式对传输数据序列中的每个载波的预定参考数据放置在有效发送数据之间进行发送，并且获得OFDM传输信号。 在接收机侧，接收到的OFDM传输信号被解调，以获得包含有效接收数据和接收到的参考数据的接收数据序列，并且根据接收到的数据序列根据接收到的有效数据，接收的参考数据， 和每个载波的预定参考数据。