公开(公告)号：US4940954A

公开(公告)日：1990-07-10

申请号：US180497

申请日：1988-04-12

申请人： Donald E. Aubert ,  You-Sun Wu ,  Vishnu W. Nerurkar

发明人： Donald E. Aubert ,  You-Sun Wu ,  Vishnu W. Nerurkar

IPC分类号： H04L27/20

CPC分类号： H04L27/2032

摘要： An unbalanced quadrature phase-shift keyed UQPSK modulator modulates two information signals onto mutually quadrature components of a carrier. If the carrier components differ from an exact quadrature relationship by an error angle, crosstalk orr distortion is introduced. The effects of such an error are ameliorated by a limiter following the modulator.

摘要翻译： 不平衡正交相移键控UQPSK调制器将两个信息信号调制到载波的相互正交分量上。 如果载波分量与精确的正交关系与误差角不同，则会引入串扰或失真。 这种误差的影响通过调制器后的限幅器来改善。

公开(公告)号：US4736170A

公开(公告)日：1988-04-05

申请号：US47941

申请日：1987-05-08

申请人： You-Sun Wu ,  Donald E. Aubert

发明人： You-Sun Wu ,  Donald E. Aubert

IPC分类号： H04L27/20

CPC分类号： H04L27/2064 ,  H04L27/2035

摘要： An unbalanced quarternary phase-shift keying modulator provides relatively higher signal power for one of two signal information channels. The carrier to be modulated is split into two equal-amplitude, equal-phase portions, each of which is applied to a biphase modulator. Each of the information signals is also applied to one of the biphase modulators, for producing two equal-amplitude, phase modulated carriers, each biphase modulated by one of the information signals. The modulated carriers are applied to the ports of a quadrature hybrid coupler which is other than a 3 dB (equal-amplitude) coupler. In one embodiment, the coupler is a 7 dB coupler. The modulated carrier applied to the through port of the coupler appears with reference amplitude and phase at the output of the hybrid. The modulated carrier applied to the other or coupled port appears at the output with relatively reduced amplitude and a relative phase shift. In one embodiment, the phase shift is 90.degree.. The resulting sum signal is quarternary keyed by the information signals. Waveguide and microstrip unbalanced couplers are described.

摘要翻译： 不平衡的三相相移键控调制器为两个信号信道之一提供相对较高的信号功率。 要调制的载波被分成两个等幅，等相位部分，每个部分被施加到双相调制器。 每个信息信号也被应用于双相调制器中的一个，用于产生两个等幅度的相位调制载波，每个相位调制载波由信号信号之一调制。 调制载波被应用于除3 dB（等振幅）耦合器之外的正交混合耦合器的端口。 在一个实施例中，耦合器是7dB耦合器。 施加到耦合器的通孔的调制载波在混合信号的输出处出现参考振幅和相位。 施加到另一个或耦合端口的调制载波出现在具有相对减小的幅度和相对相移的输出处。 在一个实施例中，相移为90°。 所得到的和信号由信息信号键入。 描述了波导和微带非平衡耦合器。

公开(公告)号：US4588958A

公开(公告)日：1986-05-13

申请号：US717877

申请日：1985-03-29

申请人： Allen Katz ,  Rajagopalan Sudarsanam ,  Donald E. Aubert

发明人： Allen Katz ,  Rajagopalan Sudarsanam ,  Donald E. Aubert

IPC分类号： H03F1/32 ,  H03G7/00

CPC分类号： H03F1/3276 ,  H03G7/00

摘要： A predistortion circuit of the reflective type uses antiparallel-connected diodes for the desired amplitude and phase nonlinearity. If the signal applied to the diodes is of not of the correct magnitude, the desired nonlinearity will not be obtained. The magnitude of the signal applied to the diodes is increased or decreased as required by an impedance transforming circuit. The impedance transforming circuit is tuned for the frequencies of interest. The overall distortion is reduced by applying a direct bias to the diode pair.

摘要翻译： 反射型的预失真电路使用反并联连接的二极管达到所需的幅度和相位非线性。 如果施加到二极管的信号的幅度不正确，则不能获得所需的非线性。 施加到二极管的信号的大小根据阻抗变换电路的要求而增加或减小。 针对感兴趣的频率调整阻抗变换电路。 通过向二极管对施加直接偏置来减小整体失真。