公开(公告)号：US5200977A

公开(公告)日：1993-04-06

申请号：US660054

申请日：1991-02-25

申请人： Hiroshi Ohnishi ,  Yuuri Yamamoto ,  Kouei Misaizu

发明人： Hiroshi Ohnishi ,  Yuuri Yamamoto ,  Kouei Misaizu

IPC分类号： H04L27/20 ,  H03H21/00 ,  H04B7/005 ,  H04J3/02 ,  H04J3/06 ,  H04L27/227

CPC分类号： H03H21/0012 ,  H04B7/005

摘要： A terminal unit apparatus for a time division multiplexing access radio communications system formed of a base station and a number of terminal units remote from the base station, includes a 2-dimensional adaptive equalizer circuit for equalizing two quadrature-relationship baseband signals which are obtained from a received quadrature digital modulation signal during receiving operation of the terminal unit, and an internal signal source which generates a local oscillator signal for use in demodulating a received signal to obtain these baseband signals. A frequency correction quantity is derived from the average rate of variation in each symbol interval of the ratio of the two main tap coefficients of the 2-dimensional adaptive equalizer circuit, and used to correct the frequency of operation of the internal signal source during both receiving operation and also in transmitting operation, in which the internal signal source provides a carrier signal for modulation. Frequency correction can thereby be achieved that is independent of the effects of multi-path interference to the transmission path upon the received quadrature digital modulation signal.

摘要翻译： 一种用于由基站和远离该基站的多个终端单元形成的时分复用接入无线电通信系统的终端单元装置，包括：二维自适应均衡器电路，用于均衡两个正交关系基带信号， 在终端单元的接收操作期间接收的正交数字调制信号，以及产生用于解调接收信号以获得这些基带信号的本地振荡器信号的内部信号源。 从二维自适应均衡器电路的两个主抽头系数的比率的每个符号间隔的平均变化率导出频率校正量，并且用于在两个接收期间校正内部信号源的操作频率 操作和发送操作，其中内部信号源提供用于调制的载波信号。 从而可以实现与接收到的正交数字调制信号时的多路径干扰对传输路径的影响的频率校正。

公开(公告)号：US5115515A

公开(公告)日：1992-05-19

申请号：US367577

申请日：1989-06-19

申请人： Yuuri Yamamoto ,  Mitsuo Makimoto

发明人： Yuuri Yamamoto ,  Mitsuo Makimoto

IPC分类号： H04B7/26 ,  H03J7/06 ,  H04B1/26

CPC分类号： H03J7/06

摘要： A base station transmits a radio-frequency signal to a mobile station. The radio-frequency signal includes a frequency calibration signal. The mobile station includes a receiver receiving the radio-frequency signal. The receiver includes a referance oscillator generating a reference signal whose frequency is controlled in accordance with the frequency calibration signal. The receiver includes mixers and local oscillators. The mixers mix the radio-frequency signal with local oscillator signals from the local oscillator signals and convert the radio-frequency signal into a corresponding intermediate-frequency signal. The local oscillator signals are synchronized with the reference signal. The frequency of the intermediate-frequency signal is divided to derive a frequency-divided signal. The frequency of the reference signal is controlled in accordance with the frequency-divided signal.

摘要翻译： 基站向移动台发送射频信号。 射频信号包括频率校准信号。 移动站包括接收射频信号的接收机。 接收机包括产生参考信号的参考振荡器，其频率根据频率校准信号被控制。 接收机包括混频器和本地振荡器。 混频器将射频信号与本地振荡器信号的本地振荡器信号混合，并将射频信号转换为相应的中频信号。 本地振荡器信号与参考信号同步。 中频信号的频率被分割以得到分频信号。 参考信号的频率根据分频信号进行控制。

公开(公告)号：US5335251A

公开(公告)日：1994-08-02

申请号：US995077

申请日：1992-12-22

申请人： Hiroshi Onishi ,  Akihiko Matsuoka ,  Kouei Misaizu ,  Yuuri Yamamoto

发明人： Hiroshi Onishi ,  Akihiko Matsuoka ,  Kouei Misaizu ,  Yuuri Yamamoto

IPC分类号： H04L1/06 ,  H04B7/08 ,  H04L1/02 ,  H04L25/03 ,  H04L27/01 ,  H04B7/10

CPC分类号： H04L1/02 ,  H04B7/0822 ,  H04L25/03063

摘要： A diversity receiver includes a first antenna and a second antenna. A first receiving section connected to the first antenna serves to convert a digital modulation wave induced at the first antenna into a first intermediate-frequency signal. A first band pass filter connected to the first receiving section serves to subject the first intermediate-frequency signal to a band pass filtering process. A second receiving section connected to the second antenna serves to convert a digital modulation wave induced at the second antenna into a second intermediate-frequency signal. A second band pass filter connected to the second receiving section serves to subject the second intermediate-frequency signal to a band pass filtering process. A switch alternately selects one of output signals of the first and second band pass filters at a period equal to a half of a period corresponding to the symbol rate. A quadrature demodulator connected to the switch serves to demodulate an output signal of the switch into quadrature baseband signals. An analog-to-digital converter connected to the quadrature demodulator converts the quadrature baseband signals into corresponding digital signals. A decision feedback adaptive equalizer connected to the analog-to-digital converter serves to subject the digital signals to an equalizing process.

摘要翻译： 分集接收机包括第一天线和第二天线。 连接到第一天线的第一接收部分用于将在第一天线处感应的数字调制波转换为第一中频信号。 连接到第一接收部分的第一带通滤波器用于使第一中频信号进行带通滤波处理。 连接到第二天线的第二接收部分用于将在第二天线处感应的数字调制波转换为第二中频信号。 连接到第二接收部分的第二带通滤波器用于使第二中频信号进行带通滤波处理。 交换机以等于对应于符号率的周期的一半的周期交替地选择第一和第二带通滤波器的输出信号之一。 连接到开关的正交解调器用于将开关的输出信号解调为正交基带信号。 连接到正交解调器的模数转换器将正交基带信号转换成相应的数字信号。 连接到模数转换器的判决反馈自适应均衡器用于对数字信号进行均衡处理。