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1. 发明授权

US06611493B1 Communication, transmission and receiving method and apparatus using orthogonal frequency division multiplexing modulation system 失效
标题翻译：采用正交频分复用调制方式的通信，收发方式及装置
公开(公告)号：US06611493B1
公开(公告)日：2003-08-26
申请号：US09236601
申请日：1999-01-26
申请人： Atsushi Miyashita , Toshiyuki Akiyama , Seiichi Sano , Hiroyuki Takesue , Tatuhiro Nakada , Nobuo Tsukamoto
发明人： Atsushi Miyashita , Toshiyuki Akiyama , Seiichi Sano , Hiroyuki Takesue , Tatuhiro Nakada , Nobuo Tsukamoto
IPC分类号： H04J1100
CPC分类号： H04L27/2608
摘要： A communication method in an orthogonal frequency division multiplexing modulation communication system includes a transmission apparatus in which a frequency bandwidth of a signal modulated in accordance with an orthogonal frequency division multiplexing modulation system is changed and the modulated signal is transmitted and a receiving apparatus in which the modulated signal is received and a frequency bandwidth for demodulation of the received signal is changed to follow the change of the frequency bandwidth of the modulated signal.
摘要翻译：正交频分复用调制通信系统中的通信方法包括：发送装置，其中根据正交频分复用调制方式调制的信号的频率带宽被改变，并且调制信号被发送;以及接收装置，其中，接收到调制信号，并且改变接收信号的解调频率带宽以跟随调制信号的频率带宽的变化。

2. 发明授权

US06304611B1 OFDM modulator and OFDM modulation method for digital modulated wave having guard interval 失效
标题翻译：具有保护间隔的数字调制波的OFDM调制器和OFDM调制方法
公开(公告)号：US06304611B1
公开(公告)日：2001-10-16
申请号：US09099390
申请日：1998-06-18
申请人： Atsushi Miyashita , Toshiyuki Akiyama , Seiichi Sano , Nobuo Tsukamoto , Tatuhiro Nakada
发明人： Atsushi Miyashita , Toshiyuki Akiyama , Seiichi Sano , Nobuo Tsukamoto , Tatuhiro Nakada
IPC分类号： H04K110
CPC分类号： H04L27/2607 , H04L27/2626
摘要： An orthogonal frequency division multiplex (OFDM) modulator of such a system as to add guard intervals to a temporal waveform generated by modulating an input data train into a large number of (sub)carriers, conducting quadrature modulation, and outputting an OFDM signal. The OFDM modulator includes an IFFT circuit for conducting inverse fast Fourier transform processing to modulate the input data train into a large number of (sub)carriers, a guard interval adder for adding a guard interval to each effective symbol duration of a composite carrier signal supplied from the IFFT circuit and outputting a resultant signal, a control signal generator for generating, in synchronism with each guard interval of the composite carrier signal having the guard intervals added thereto, such a control signal as to attenuate signal amplitude of the composite carrier signal over an interval substantially equal in length to each guard interval; and an amplitude controller, responsive to the control signal, to attenuate the amplitude of the composite carrier signal supplied from the guard interval adder and output a resultant signal, only over an interval substantially equal in length to each guard interval. The amplitude controller outputting, in remaining intervals, the composite carrier signal supplied from the guard interval adder as it is.
摘要翻译：这种系统的正交频分复用（OFDM）调制器，用于通过将输入数据串调制成大量（子）载波，进行正交调制并输出OFDM信号而产生的时间波形增加保护间隔。 OFDM调制器包括用于进行快速傅立叶逆变换逆变换处理以将输入数据串调制成大量（子）载波的IFFT电路，用于将提供的复合载波信号的每个有效符号持续时间加上保护间隔的保护间隔加法器从IFFT电路输出结果信号，控制信号发生器，与与其相加的保护间隔的复合载波信号的每个保护间隔同步地产生一个控制信号，以便衰减复合载波信号的信号幅度长度与每个保护间隔基本相等的间隔; 以及振幅控制器，响应于控制信号，衰减从保护间隔加法器提供的复合载波信号的振幅，并输出结果信号，仅在长度上与每个保护间隔基本相等的间隔上。幅度控制器以剩余的间隔输出从保护间隔加法器原样提供的复合载波信号。

3. 发明授权

US06473466B1 Data transmitting method and data transmitting apparatus accompanied with a plurality of transmitting of receiving antennas 失效
标题翻译：伴随着多个接收天线的发送的数据发送方法和数据发送装置
公开(公告)号：US06473466B1
公开(公告)日：2002-10-29
申请号：US09206406
申请日：1998-12-07
申请人： Atsushi Miyashita , Seiichi Sano , Toshiyuki Akiyama , Nobuo Tsukamoto , Tatuhiro Nakada
发明人： Atsushi Miyashita , Seiichi Sano , Toshiyuki Akiyama , Nobuo Tsukamoto , Tatuhiro Nakada
IPC分类号： H04B720
CPC分类号： H04B7/0608 , H04L1/0001 , H04L2025/03694
摘要： A data transmitting apparatus in which in an antenna switching of the data transmitting apparatus, a sudden change of transmission path characteristics is prevented and a state where an automatic equalizing function on the reception side can follow can be held. The apparatus has a processing circuit for gradually switching antennas of the data transmitting apparatus with respect to the time and for continuously switching one antenna from the rated level to the 0 level and for continuously switching the other antenna from the 0 level to the rated level. The apparatus operates so as to always keep the optimum constellation state in which the automatic equalizing process follows.
摘要翻译：一种数据发送装置，其中在数据发送装置的天线切换中防止传输路径特性的突然变化，并且可以保持接收侧的自动均衡功能能够跟随的状态。该装置具有处理电路，用于相对于时间逐渐切换数据发送装置的天线，并且将一个天线从额定电平连续地切换到0电平，并且将另一个天线从0电平连续地切换到额定电平。该装置操作以便始终保持自动均衡处理遵循的最佳星座状态。

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