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1. 发明公开

EP0649237A1 AFC circuit for QPSK demodulator 失效
标题翻译： AFC-Schaltungfüreinen QPSK-Demodulator。
公开(公告)号：EP0649237A1
公开(公告)日：1995-04-19
申请号：EP94306801.5
申请日：1994-09-16
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Taga, Noboru, c/o Intellectual Property Division , Ishikawa, Tatsuya, c/o Intellectual Property Div. , Komatsu, Susumu, c/o Intellectual Property Div.
IPC分类号： H04L27/22
CPC分类号： H04L27/2332 , H04L2027/0032 , H04L2027/0055 , H04L2027/0057 , H04L2027/0065 , H04L2027/0081
摘要： AFC circuit for QPSK demodulator including, a circuit for obtaining quadrature related detection signals by multiplying a modulated input signal with quadrature related local oscillation frequency signals from a quadrature phase local oscillator, digital converter for converting the detection signals into corresponding digital signals by sampling them with quadrature related clocks which have a frequency two times higher than a symbol rate of the input signal, frequency error detecter for detecting a frequency error between the quadrature related digital signals using a symbol timing sample value and a symbol intermediate timing sample value in the converted digital signals, first validity determinator for determining whether the frequency error signal is valid or not through a detection of the pattern of the modulated input signal from sample values before and after the symbol timing so as to result a first validity signal, second validity determinator for deetermining whether the frequency error signal is valid or not through a detection of an absolute sample value of the symbol intermediate timing so as to result a second validity signal, and valid frequency error extractor for extracting the frequency error signal as a frequency control signal for controlling the oscillation frequency of the local oscillator when the frequency error signal has been proved to be valid by the first and the second validity signals.
摘要翻译：用于QPSK解调器的AFC电路，包括：通过将调制输入信号与来自正交相位本地振荡器的正交相关本地振荡频率信号相乘获得正交相关检测信号的电路，用于通过对检测信号进行采样将检测信号转换成相应的数字信号，具有比输入信号的符号率高两倍的频率的正交相关时钟，用于使用符号定时采样值检测正交相关数字信号之间的频率误差的频率误差检测器和转换后的数字信号中的符号中间定时采样值信号，第一有效性确定器，用于通过从符号定时之前和之后的采样值检测调制输入信号来确定频率误差信号是否有效，以产生第一有效信号，第二有效性确定器用于确定无论是通过检测符号中间定时的绝对采样值来产生第一有效信号，以及用于提取频率误差信号的有效频率误差提取器作为用于控制振荡频率的频率控制信号，当频率误差信号被证明是有效的第一和第二有效信号时的本地振荡器。

2. 发明公开

EP0527034A2 Digital phase-locked loop circuit 失效
标题翻译： Digitale Phasenregelschleife。
公开(公告)号：EP0527034A2
公开(公告)日：1993-02-10
申请号：EP92307120.3
申请日：1992-08-04
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA AVE CO., LTD
发明人： Taga, Noboru, c/o Intellectual Property Division , Ishikawa, Tatsuya, c/o Intellectual Property Div. , Komatsu, Susumu c/o Intellectual Property Division
IPC分类号： H04L27/22 , H03L7/087
CPC分类号： H04L27/2332 , H03L7/087 , H03L2207/14 , H04L2027/003 , H04L2027/0057 , H04L2027/0079
摘要： A digital phase locked loop, incorporating a phase comparator, which produces a phase deviation signal with a sinusoidal phase comparison characteristic rather than a sawtooth phase comparison characteristic, in order to avoid aliases.
摘要翻译：一种数字锁相环，其包括相位比较器，其产生具有正弦相位比较特性而不是锯齿相位比较特性的相位偏差信号，以避免别名。

3. 发明公开

EP0527034A3 Digital phase-locked loop circuit 失效
标题翻译：数字锁相环路
公开(公告)号：EP0527034A3
公开(公告)日：1993-08-11
申请号：EP92307120.3
申请日：1992-08-04
申请人： KABUSHIKI KAISHA TOSHIBA , TOSHIBA AVE CO., LTD
发明人： Taga, Noboru, c/o Intellectual Property Division , Ishikawa, Tatsuya, c/o Intellectual Property Div. , Komatsu, Susumu c/o Intellectual Property Division
IPC分类号： H04L27/22 , H03L7/087
CPC分类号： H04L27/2332 , H03L7/087 , H03L2207/14 , H04L2027/003 , H04L2027/0057 , H04L2027/0079
摘要： A digital phase locked loop, incorporating a phase comparator, which produces a phase deviation signal with a sinusoidal phase comparison characteristic rather than a sawtooth phase comparison characteristic, in order to avoid aliases.

4. 发明授权

EP0734132B1 Signal structure for multicarrier modulation, which reduces the overhead requirement 失效
标题翻译：信号结构，用于多载波调制，这减少了需要额外的能力以管理
公开(公告)号：EP0734132B1
公开(公告)日：2005-12-14
申请号：EP96104617.4
申请日：1996-03-22
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Seki, Takashi, c/o Intellectual Property Division , Taga, Noboru, c/o Intellectual Property Division , Okita, Shigeru, c/o Intellectual Property Division , Ishikawa, Tatsuya, c/o Intellectual Property Div.
IPC分类号： H04L5/06 , H04L5/02 , H04L27/26
CPC分类号： H04L27/2657 , H04L5/0048 , H04L25/0232 , H04L25/03159 , H04L27/18 , H04L27/2613 , H04L27/2662 , H04L27/2675 , H04L27/34

5. 发明公开

EP0734132A2 Signal structure for multicarrier modulation, which reduces the overhead requirement 失效
标题翻译： SignalaufbaufürMehrträgermodulation，der den Bedarf anZusatzkapazitätzur Verwaltung vermindert
公开(公告)号：EP0734132A2
公开(公告)日：1996-09-25
申请号：EP96104617.4
申请日：1996-03-22
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Seki, Takashi, c/o Intellectual Property Division , Taga, Noboru, c/o Intellectual Property Division , Okita, Shigeru, c/o Intellectual Property Division , Ishikawa, Tatsuya, c/o Intellectual Property Div.
IPC分类号： H04L5/06
CPC分类号： H04L27/2657 , H04L5/0048 , H04L25/0232 , H04L25/03159 , H04L27/18 , H04L27/2613 , H04L27/2662 , H04L27/2675 , H04L27/34
摘要： A transmission system is disclosed which permits the receiving end to demodulate multi-valued modulated symbols successfully under fading conditions and reduces the amount of transmit reference data to improve data transmission efficiency. At the transmitting end, a multiplexing section (101), a modulating section (102), and a transmitting section (103) are provided. In transmitting an OFDM transmission frame, null symbols and reference symbols are placed in the beginning portion of the frame and QPSK symbols are placed in an information symbol data region in the frame with equal spacings in time and frequency. At the receiving end, a receiving section (111), a demodulation (112) section, an equalizing section (113), and a demultiplexing section (117) are provided. An error detector (114) detects amplitude and phase errors of each carrier from the reference symbols, and a variation detector (115) detects variations in amplitude and phase of a received signal from the QPSK symbols. The carrier amplitude and phase errors are corrected by a correction information producing section (116) on the amplitude and phase variations of the received signal detected by the variation detector to produce correction information. The equalizing section equalizes the demodulated symbol data according to the correction information.
摘要翻译：公开了一种传输系统，其允许接收端在衰落条件下成功解调多值调制符号，并减少发射参考数据量以提高数据传输效率。在发送端，设置复用部（101），调制部（102）和发送部（103）。在发送OFDM传输帧时，将空符号和参考符号放置在帧的开始部分，并且将QPSK符号放置在帧中的信息符号数据区域中，时间和频率等间隔。在接收端设置有接收部分（111），解调部分（112）部分，均衡部分（113）和解复用部分（117）。误差检测器（114）从参考符号检测每个载波的幅度和相位误差，并且变化检测器（115）根据QPSK符号检测接收信号的幅度和相位的变化。通过校正信息产生部分（116）对由变化检测器检测到的接收信号的幅度和相位变化校正载波振幅和相位误差，以产生校正信息。均衡部根据校正信息对解调后的符号数据进行均衡。

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