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公开(公告)号：US5128625A
公开(公告)日：1992-07-07
申请号：US581820
申请日：1990-09-12
申请人： Yohtaro Yatsuzuka , Takuro Muratani
发明人： Yohtaro Yatsuzuka , Takuro Muratani
IPC分类号： H03L7/06 , H03L7/099 , H03L7/10 , H04L27/22 , H04L27/227
CPC分类号： H03L7/10 , H03L7/0991
摘要： A phase lock loop for a digital input signal has a phase detector, a loop filter, a digital voltage controlled oscillator (VCO), an initial phase difference calculator, a center frequency difference calculator and an input buffer memory. In an initial training mode prepared in the PLL operation, an optimum initial phase and an optimum center frequency of the VCO to complete a lock-in state is searched for the input signal stored in the buffer memmory. By estimating the initial phase difference and the center frequency difference between the input signal and the VCO output with repetative kick-offs in calculators, optimum values mentioned above are obtained. In a normal operation mode as a second mode in which the PLL operates normally as a conventional PLL, a phase lock operation between the VCO outut as the reference signal and the input signal in the buffer memory is carried out after the PLL is kicked off with the optimum initial phase and the optimum center frequency determined in the initial training mode.
摘要翻译： 用于数字输入信号的锁相环具有相位检测器，环路滤波器，数字压控振荡器（VCO），初始相位差计算器，中心频率差计算器和输入缓冲存储器。 在PLL操作中准备的初始训练模式中，搜索用于完成锁定状态的VCO的最佳初始相位和最佳中心频率以存储在缓冲器存储器中的输入信号。 通过在计算器中通过重复启动来估计输入信号和VCO输出之间的初始相位差和中心频率差，获得上述最佳值。 在作为常规PLL正常工作的第二模式的正常操作模式中，作为参考信号的VCO停止与缓冲存储器中的输入信号之间的锁相操作在PLL被启动之后执行， 在初始训练模式中确定最佳初始相位和最佳中心频率。
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公开(公告)号：US4328587A
公开(公告)日：1982-05-04
申请号：US115534
申请日：1980-01-25
申请人： Toshio Mizuno , Takuro Muratani
发明人： Toshio Mizuno , Takuro Muratani
IPC分类号： H04L27/227 , H03L7/02
CPC分类号： H04L27/2275 , H04L27/2273
摘要： A phase slip detector and systems employing said detector comprises a frequency detector for detecting an instantaneous value of received carrier frequency and an integrator for integrating the output of said detector, and determines an occurrence of phase slip by detecting the output level of the integrator larger than predetermind threshold level. Application of the phase slip detector to a carrier recovery system makes it possible to obtain a correct recovered carrier without the effect of phase slip, and application of the detector to a demodulated data compensation system makes it possible to obtain received or demodulated data compressed in generation of burst error and free from the effect of the phase slip.
摘要翻译： 相位滑动检测器和采用所述检测器的系统包括用于检测接收载波频率的瞬时值的频率检测器和用于对所述检测器的输出进行积分的积分器，并且通过检测积分器的输出电平大于 预设阈值级别。 将相位检测器应用到载波恢复系统使得可以获得正确的恢复载波而不会产生相位滑移，并且将检测器应用于解调数据补偿系统使得可以获得在一代中压缩的接收或解调数据 的突发错误并且没有相位滑移的影响。
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公开(公告)号：US4272846A
公开(公告)日：1981-06-09
申请号：US4989
申请日：1979-01-19
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。
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公开(公告)号：US4748622A
公开(公告)日：1988-05-31
申请号：US890235
申请日：1986-07-29
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。
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公开(公告)号：US5066957A
公开(公告)日：1991-11-19
申请号：US511681
申请日：1990-04-20
申请人： Toshio Mizuno , Takuro Muratani , Yasuhiko Ito , Tatsuo Watanabe , Takashi Inoue
发明人： Toshio Mizuno , Takuro Muratani , Yasuhiko Ito , Tatsuo Watanabe , Takashi Inoue
CPC分类号： H04L5/02 , H04B7/18532
摘要： In a satellite communication system including a plural small earth stations (3-8), a relay earth station (2) and a satellite (1), information transmission is undertaken by primary modulation of carrier wave, and transmission of operation status of each small earth station (3-8) is carried out by secondary modulation of said carrier wave. Primary modulation may be BPSK or multiphase PSK (MPSK), and secondary modulation may be PSK, ASK or FSK. Said operation status may be receive signal quality in each small earth station, and the relay earth station (2) may adjust transmit power to said small earth station such that the receive signal quality at small earth stations satisfies desired criteria irrespective of rain attenuation.
摘要翻译： 在包括多个小地球站（3-8），中继地球站（2）和卫星（1）的卫星通信系统中，通过载波的一次调制进行信息传输，并且每个小地面站的操作状态的传输 地球站（3-8）通过所述载波的二次调制进行。 主调制可以是BPSK或多相PSK（MPSK），二次调制可以是PSK，ASK或FSK。 所述操作状态可以是每个小地球站中的接收信号质量，并且中继地球站（2）可以调整到所述小地球站的发射功率，使得小地球站的接收信号质量不管雨衰是否满足期望的标准。
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公开(公告)号：US4862104A
公开(公告)日：1989-08-29
申请号：US296897
申请日：1989-01-12
摘要： A phase synchronization circuit for processing a received signal, the phase of which is detected by a first reference carrier from a fixed oscillator and a second reference carrier orthogonal to the first reference carrier. Two baseband signals are thus obtained and sampled with a certain period. Converters convert these two signals into digital values. Phase and amplitude values at each sample point are obtained from these digital values orthogonal to each other. The frequency and phase differences between the received signal and each of the first and second reference carriers are estimated by an optimization method by utilization of pluralities of phase and amplitude data obtained with a fixed period of time. The voltage-controlled oscillator and the phase shifter are controlled with the estimated values for generating a recovered carrier of a phase synchronized with the received signal. A circuit is provided in which the hysteresis of frequency and phase differences are stored at the time of current estimation. The stored values and currently-estimated values are compared with each other. On the basis of the results of the comparison of these values, the received signal is analogized. The numbers of data samples for use in the estimation of the frequency and phase differences are made variable according to the result analogy, thereby achieving an optimum phase synchronization in accordance with the state of the received signal.
摘要翻译： 一种用于处理接收信号的相位同步电路，其相位由来自固定振荡器的第一参考载波和与第一参考载波正交的第二参考载波检测。 从而获得两个基带信号并在一定周期内采样。 转换器将这两个信号转换为数字值。 从这些彼此正交的数字值获得每个采样点的相位和振幅值。 通过利用在固定时间段内获得的多个相位和幅度数据的优化方法来估计接收信号与第一和第二参考载波中的每一个之间的频率和相位差。 压控振荡器和移相器由用于产生与接收信号同步的相位的恢复载波的估计值来控制。 提供一种电路，其中在当前估计时存储频率和相位差的滞后。 将存储的值和当前估计值彼此进行比较。 基于这些值的比较结果，接收到的信号被类比。 根据结果类推，使用于估计频率和相位差的数据样本数量可变，从而根据接收信号的状态实现最佳相位同步。
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