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1. 发明公开

EP0653858A2 OFDM Synchronization demodulation circuit 失效
标题翻译： OFDM同步解调电路
公开(公告)号：EP0653858A2
公开(公告)日：1995-05-17
申请号：EP94308433.5
申请日：1994-11-15
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Seki, Takashi, c/o Intellectual Property Division , Sugita, Yasushi, Intellectual Property Division , Ishikawa, Tatsuya, Intellectual Property Division
IPC分类号： H04L5/06
CPC分类号： H04L27/2665 , H04L27/2657 , H04L27/2662
摘要： The invention provides an OFDM synchronization demodulation circuit which includes a receiving circuit for receiving an orthogonal modulated wave of an orthogonal frequency division multiplex (OFDM) modulated signal having an available symbol period and a guard period in waveform which coincides with a part of the available symbol period, an orthogonal axes demodulation circuit for demodulating an in-phase axis detection signal and an orthogonal axis detection signal through orthogonal detection for the OFDM modulated wave from the receiving circuit, a first delay circuit for delaying the in-phase axis detection signal by the available symbol period, a second delay circuit for delaying the orthogonal axis detection signal by the available symbol period, a correlation calculation circuit for calculating coefficients of the correlations of the in-phase axis detection signal and the orthogonal axis detection signal from the orthogonal demodulation circuit with the output of the first or the second delay circuits, a guard timing detection circuit for detecting a timing of the guard period in the demodulation outputs from the orthogonal demodulation circuit, and an OFDM signal demodulation circuit for demodulating the OFDM modulated signal by extracting the available symbol period signal only from the demodulated output of the orthogonal demodulation circuit using the timing signal.
摘要翻译：本发明提供了一种OFDM同步解调电路，它包括接收电路，用于接收正交频分多路复用（OFDM）调制信号的正交调制波，正交调制信号具有可用码元周期和波形保护周期，该波形与可用码元的一部分一致正交轴解调电路，用于通过对来自接收电路的OFDM调制波的正交检测对同相轴检测信号和正交轴检测信号进行解调;第一延迟电路，用于将同相轴检测信号延迟第二延迟电路，用于将正交轴检测信号延迟可用符号周期;相关性计算电路，用于计算来自正交解调电路的同相轴检测信号和正交轴检测信号的相关系数与第一或第三的输出第2延迟电路，检测来自正交解调电路的解调输出中的保护期间的定时的保护定时检测电路以及仅从该正交解调电路的解调输出中提取可用码元周期信号来解调OFDM调制信号的OFDM信号解调电路使用定时信号解调正交解调电路的输出。

2. 发明授权

EP0653858B1 OFDM Synchronization demodulation circuit 失效
标题翻译：同步解调电路，用于OFDM
公开(公告)号：EP0653858B1
公开(公告)日：2005-01-26
申请号：EP94308433.5
申请日：1994-11-15
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Seki, Takashi, c/o Intellectual Property Division , Sugita, Yasushi, Intellectual Property Division , Ishikawa, Tatsuya, Intellectual Property Division
IPC分类号： H04L5/06
CPC分类号： H04L27/2665 , H04L27/2657 , H04L27/2662

3. 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

4. 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。

5. 发明公开

EP0653858A3 OFDM Synchronization demodulation circuit 失效
标题翻译：同步解调电路，用于OFDM。
公开(公告)号：EP0653858A3
公开(公告)日：1995-10-18
申请号：EP94308433.5
申请日：1994-11-15
申请人： KABUSHIKI KAISHA TOSHIBA
发明人： Seki, Takashi, c/o Intellectual Property Division , Sugita, Yasushi, Intellectual Property Division , Ishikawa, Tatsuya, Intellectual Property Division
IPC分类号： H04L5/06
CPC分类号： H04L27/2665 , H04L27/2657 , H04L27/2662
摘要： The invention provides an OFDM synchronization demodulation circuit which includes a receiving circuit for receiving an orthogonal modulated wave of an orthogonal frequency division multiplex (OFDM) modulated signal having an available symbol period and a guard period in waveform which coincides with a part of the available symbol period, an orthogonal axes demodulation circuit for demodulating an in-phase axis detection signal and an orthogonal axis detection signal through orthogonal detection for the OFDM modulated wave from the receiving circuit, a first delay circuit for delaying the in-phase axis detection signal by the available symbol period, a second delay circuit for delaying the orthogonal axis detection signal by the available symbol period, a correlation calculation circuit for calculating coefficients of the correlations of the in-phase axis detection signal and the orthogonal axis detection signal from the orthogonal demodulation circuit with the output of the first or the second delay circuits, a guard timing detection circuit for detecting a timing of the guard period in the demodulation outputs from the orthogonal demodulation circuit, and an OFDM signal demodulation circuit for demodulating the OFDM modulated signal by extracting the available symbol period signal only from the demodulated output of the orthogonal demodulation circuit using the timing signal.

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