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1. 发明授权

US4748622A Satellite communication system 失效
标题翻译：卫星通信系统
公开(公告)号：US4748622A
公开(公告)日：1988-05-31
申请号：US890235
申请日：1986-07-29
申请人： Takuro Muratani , Tatsuo Watanabe , Michihisa Ohkawa , Keiichiro Koga
发明人： Takuro Muratani , Tatsuo Watanabe , Michihisa Ohkawa , Keiichiro Koga
IPC分类号： H04B7/15 , H04B7/185 , H04J3/06
CPC分类号： H04B7/18578 , H04J3/0626
摘要： A satellite communication among a plurality of small earth stations (very small aperture terminal;VSAT) through a satellite is performed by using a relay earth station which has higher power than a small earth station. A signal goes from an originating small earth station to a destination small earth station, through a satellite, a relay earth station, and a satellite by using two hops propagation. Communication is carried out in digital form. The relay earth station regenerates digital signals from small earth stations. In the process of the regeneration of the digital signals, the error correction technique is applied to reduce the error rate, and a frequency compensation technique is also employed. Thus, a small simple earth station can provide high quality of communication with high C/N. A reference clock signal for operating a small earth station is derived from a reception signal from a satellite.
摘要翻译：通过使用具有比小地球站更高的功率的中继地球站，通过卫星进行多个小地球站（非常小的孔径终端; VSAT）之间的卫星通信。信号通过卫星，中继地球站和卫星通过使用两个跳传播从原始的小地球站到达目的地小地球站。沟通以数字形式进行。中继地球站从小地球站再生数字信号。在数字信号的再生过程中，采用纠错技术来降低误码率，并采用频率补偿技术。因此，一个小型简单的地球站可以提供高C / N的高质量通信。用于操作小型地球站的参考时钟信号是从卫星的接收信号导出的。

2. 发明授权

US4272846A Method for cancelling impulsive noise 失效
标题翻译：消除脉冲噪声的方法
公开(公告)号：US4272846A
公开(公告)日：1981-06-09
申请号：US4989
申请日：1979-01-19
申请人： Takuro Muratani , Tatsuo Watanabe , Michihisa Ohkawa , Takeshi Mizuike
发明人： Takuro Muratani , Tatsuo Watanabe , Michihisa Ohkawa , Takeshi Mizuike
IPC分类号： H04B1/10 , H04B1/12 , H04B14/04
CPC分类号： H04B1/12
摘要： A method for cancelling impulsive noise in a system of transmitting a band-limited baseband signal through a channel with a wider band than that of the baseband signal, in which an impulsive noise caused in the transmission channel is detected, to produce a detected output, from the received signal of the transmission channel outside of the frequency band of the band-limited baseband signal, and in which a cancelling pulse of reverse-polarity is produced as a pseudo noise pulse from the detected impulsive noise output and then superimposed on the original received signal, thereby cancelling the impulsive noise.
摘要翻译：一种在通过具有比基带信号更宽的频带的信道发送带限基带信号的系统中消除脉冲噪声的方法，其中检测到在传输信道中引起的脉冲噪声，以产生检测到的输出，从频带限制基带信号的频带以外的发送信道的接收信号，根据检测出的脉冲噪声输出产生反极性的抵消脉冲作为伪噪声脉冲，然后叠加在原始信号上接收信号，从而消除脉冲噪声。

3. 发明授权

US4553086A Carrier power to noise power ratio measuring system for TDMA signals 失效
标题翻译：载波功率比测量系统用于TDMA信号
公开(公告)号：US4553086A
公开(公告)日：1985-11-12
申请号：US472292
申请日：1983-03-04
申请人： Tatsuo Watanabe , Michihisa Ohkawa , Toshio Mizuno
发明人： Tatsuo Watanabe , Michihisa Ohkawa , Toshio Mizuno
IPC分类号： G01R29/26 , G01R27/00
CPC分类号： G01R29/26
摘要： A system for measuring a carrier power to noise power ratio of a TDMA (Time Division Multiple Access) signal corrupted by noise comprises a detector for detecting the signal, a circuit to sample the output signal from the detector, a circuit for holding the sampled detector output, and an A/D converter for converting the signal held as described above into a digital quantity. A signal processor effects the measurement of the carrier power to noise power ratio of a signal under test by finding at least one of the squared average value, the average value, and the dispersion on the basis of the output of the aforementioned A/D converter.
摘要翻译：用于测量被噪声损坏的TDMA（时分多址）信号的载波功率与功率比的系统包括用于检测信号的检测器，用于对来自检测器的输出信号进行采样的电路，用于保持采样检测器的电路输出和用于将如上所述保持的信号转换为数字量的A / D转换器。信号处理器通过基于上述A / D转换器的输出找到平均值，平均值和色散中的至少一个来实现测试信号的载波功率与噪声功率比的测量。

4. 发明授权

US4566100A Bit error rate measuring system 失效
标题翻译：误码率测量系统
公开(公告)号：US4566100A
公开(公告)日：1986-01-21
申请号：US486319
申请日：1983-04-19
申请人： Toshio Mizuno , Gunkichi Satoh , Michihisa Ohkawa
发明人： Toshio Mizuno , Gunkichi Satoh , Michihisa Ohkawa
IPC分类号： H04L1/00 , H04L1/20 , H04L27/00 , G06F11/00
CPC分类号： H04L1/206
摘要： A bit error rate of M-phase digital phase-modulated waves is measured by the steps comprising multiplying a received wave by M, phase-detecting the M-multiplied signal either directly or after frequency conversion, detecting errors by comparing the output level of the phase detection with a threshold, and counting the number of such errors. By employing above mentioned system, a bit error rate can be measured easily and accurately by a simple circuit structure.
摘要翻译：通过以下步骤测量M相数字相位调制波的误码率，该步骤包括将接收波乘以M，直接或在频率转换之后相位检测M相乘信号，通过比较输出电平具有阈值的相位检测，并且对这些错误的数量进行计数。通过采用上述系统，可以通过简单的电路结构容易且精确地测量误码率。

5. 发明授权

US4612515A PLL having phase comparator with hysteresis characteristics 失效
标题翻译： PLL具有滞后特性的相位比较器
公开(公告)号：US4612515A
公开(公告)日：1986-09-16
申请号：US749848
申请日：1985-06-28
申请人： Michihisa Ohkawa , Hideo Kobayashi
发明人： Michihisa Ohkawa , Hideo Kobayashi
IPC分类号： H03L7/10 , H03L7/085 , H03L7/087 , H04L27/227 , H03L7/06
CPC分类号： H03L7/087
摘要： A phase synchronization circuit of a phase lock loop having a phase comparator, a loop filter or a low-pass filter and a voltage controlled oscillator controlled by output of said loop filter has been improved by a phase comparator having the hysterisis characteristics in which one of a pair of output levels is provided for each input phase difference according to phase error direction, except in the vicinity of a stable point of phase.
摘要翻译：具有相位比较器，环路滤波器或低通滤波器以及由所述环路滤波器的输出控制的压控振荡器的锁相环的相位同步电路已经通过具有滞后特性的相位比较器而改进，除了在稳定的相位附近，根据相位误差方向为每个输入相位差提供一对输出电平。

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