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    • 14. 发明授权
    • Satellite communication system
    • 卫星通信系统
    • US4748622A
    • 1988-05-31
    • US890235
    • 1986-07-29
    • Takuro MurataniTatsuo WatanabeMichihisa OhkawaKeiichiro Koga
    • Takuro MurataniTatsuo WatanabeMichihisa OhkawaKeiichiro Koga
    • H04B7/15H04B7/185H04J3/06
    • H04B7/18578H04J3/0626
    • 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.
    • 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。
    • 15. 发明授权
    • Feed-forward microwave power amplifier with difference signal distortion
cancellation circuit
    • 前馈微波功率放大器,具有差分信号失真消除电路
    • US4629996A
    • 1986-12-16
    • US671849
    • 1984-11-15
    • Tatsuo WatanabeKiyohiko Suzuki
    • Tatsuo WatanabeKiyohiko Suzuki
    • H03F1/32H03F1/26
    • H03F1/3229
    • A feed forward microwave power amplifier having a divider for dividing an input signal into two parts, a first main amplifier for amplifying one of the divided signals, means for providing a part of the output of the first amplifier as a signal S.sub.1, means for providing a signal S.sub.2 by another output of the divider, a subtractor for providing the difference between S.sub.2 and S.sub.1, a second amplifier having the same gain as that of the first amplifier for amplifying this difference, a 3 dB coupler for coupling an output S.sub.4 of the first amplifier and an output S.sub.4 e, where e is a constant, of the second amplifier to provide coupled power which is free from distortion, and adjusting means for adjusting the level of signals S.sub.1 and S.sub.2 so that S.sub.2 is higher than S.sub.1, and the value e is in the range between 0.2 and 0.5. The particular features of the present invention, compared with a prior feed forward amplifier, are the use of a 3 dB coupler, and the configuration of the second amplifier which accepts not only the distortion component but also some desired component of the output of the first amplifier.
    • 一种前馈微波功率放大器,具有用于将输入信号分成两部分的分频器,用于放大所分割信号中的一个的第一主放大器,用于将第一放大器的输出的一部分提供为信号S1的装置, 通过分频器的另一输出的信号S2,用于提供S2和S1之间的差的减法器,具有与用于放大该差的第一放大器相同的增益的第二放大器,用于耦合第一放大器的输出S4的3dB耦合器 第一放大器和第二放大器的e为常数的输出S4e,以提供没有失真的耦合功率,以及用于调整信号S1和S2的电平以使S2高于S1的调整装置,并且该值 e在0.2和0.5之间。 与现有的前馈放大器相比,本发明的特征是使用3dB耦合器,并且第二放大器的配置不仅接受失真分量,而且还接受第一放大器的输出的一些期望分量 放大器