公开(公告)号：US5193224A

公开(公告)日：1993-03-09

申请号：US690432

申请日：1991-04-24

Applicant: John D. McNicol ,  Stephen G. Harman

Inventor： John D. McNicol ,  Stephen G. Harman

IPC: H03C3/08 ,  H03F1/32 ,  H04L27/36

CPC classification number: H03F1/3247 ,  H03C3/08 ,  H03F1/3258 ,  H03F1/3282 ,  H04L27/368 ,  H03F2200/438 ,  H03F2201/3233

Abstract: In a QAM microwave radio communications system an IF (intermediate frequency) input signal is amplified and predistorted, and the amplified IF signal is mixed with a local oscillator signal to produce an RF (radio frequency) signal which is amplified in a power amplifier for transmission, the predistortion compensating for non-linearity of the power amplifier. Adaptive phase control of the predistorter is provided by mixing the local oscillator signal with part of the RF signal to produce an IF output signal representative of the output of the power amplifier, detecting phase differences between the IF input and IF output signals to produce a phase difference signal, selectively inverting the phase difference signal in dependence upon whether or not an IF signal amplitude exceeds a comparison level, and integrating the selectively inverted phase difference signal to produce a phase control signal for the predistorter.

Abstract translation: 在QAM微波无线电通信系统中，IF（中频）输入信号被放大和预失真，并且放大的IF信号与本地振荡器信号混合以产生RF（射频）信号，该RF（射频）信号在用于传输的功率放大器中被放大 ，补偿功率放大器非线性的预失真。 通过将本地振荡器信号与RF信号的一部分混合来产生预失真器的自适应相位控制，以产生表示功率放大器的输出的IF输出信号，检测IF输入和IF输出信号之间的相位差，以产生相位 差分信号，根据IF信号幅度是否超过比较电平，选择性地反相相位差信号，并积分有选择地反相的相位差信号，以产生用于预失真器的相位控制信号。

公开(公告)号：US4977580A

公开(公告)日：1990-12-11

申请号：US256958

申请日：1988-10-13

Applicant: John D. McNicol

Inventor： John D. McNicol

IPC: H04L27/22 ,  H04J3/00 ,  H04L7/00 ,  H04L7/02 ,  H04L7/027 ,  H04L7/10 ,  H04L27/00 ,  H04L27/227 ,  H04L27/233

CPC classification number: H04L7/0029 ,  H04L27/2273 ,  H04L27/2276 ,  H04L27/2332 ,  H04L2027/003 ,  H04L2027/0048 ,  H04L2027/0095 ,  H04L7/0274

Abstract: The present invention provides a method of detecting the clock rate and recovering the carrier in a TDMA (time division multiple access) signal. The quadrature baseband components are stored for a predetermined amount of time as sampled data and the clock phase error of the baseband samples are estimated. The clock phase of the baseband samples are corrected from the estimated clock phase error by using interpolation over the sampled quadrature components. The carrier phase error of the stored baseband time corrected quadrature samples are then estimated and the carrier phase is corrected according to the estimated phase error. The corrected clock and carrier signals are then forwarded to decision circuit means for providing demodulated data.

Abstract translation: 本发明提供了一种在TDMA（时分多址）信号中检测时钟速率和恢复载波的方法。 将正交基带分量作为采样数据存储预定量的时间，并估计基带采样的时钟相位误差。 通过对采样的正交分量进行插值，从估计的时钟相位误差校正基带采样的时钟相位。 然后估计存储的基带时间校正正交采样的载波相位误差，并根据估计的相位误差校正载波相位。 校正的时钟和载波信号然后被转发到用于提供解调数据的判定电路装置。

公开(公告)号：US09621274B2

公开(公告)日：2017-04-11

申请号：US13082378

申请日：2011-04-07

Applicant: John D. McNicol ,  Kuang-Tsan Wu

Inventor： John D. McNicol ,  Kuang-Tsan Wu

IPC: H04B10/06 ,  H04B10/50 ,  H04B10/556

CPC classification number: H04B10/5055 ,  H04B10/5561

Abstract: Consistent with the present disclosure a transmitter is provided that transmits data in either a “quasi-DP-BPSK” (“QDP”) mode or in a DP-QPSK mode. In the QDP mode, data bits are transmitted as changes in phase between first and second phase states along a first axis or as changes in phase between third and fourth phase states along a second axis in the IQ plane. Although the transmitter outputs an optical signal that changes in phase between each of the four states, a sequence bit identifies which axis carries the data bit. The sequence bit is one of a series of sequence bits that may be generated by a pseudo-random number generator. The series of sequence bits can be relatively long, e.g., 32 bits, to permit sufficiently random changes in the axis that carries the data. Thus, unlike conventional BPSK, in which data is transmitted between phase states along a single axis, the present disclosure provides an apparatus and related method for randomly selecting one of two axes, for example, for each transmitted bit. In the receiver, it has been observed that the MU-CMA algorithm can process data carried by optical signals in the QDP mode with relatively few errors. Thus, the same equalizer (FIR) filter may be used to process BPSK, as well as QPSK data.

公开(公告)号：US09485049B2

公开(公告)日：2016-11-01

申请号：US13853421

申请日：2013-03-29

Applicant: John D. McNicol ,  Han H. Sun ,  David J. Krause

Inventor： John D. McNicol ,  Han H. Sun ,  David J. Krause

IPC: H04B10/079 ,  H04J14/02 ,  H04B10/04 ,  H04B10/077 ,  H04B10/50

CPC classification number: H04J14/0224 ,  H04B10/0775 ,  H04B10/506 ,  H04B2210/072 ,  H04J14/0273

Abstract: An optical system may include optical transmitters to provide respective optical signals. Each of the respective optical signals may provide one or more carriers in an optical channel. The optical channel may include multiple carriers associated with the respective optical signals. First and second carriers, of the multiple carriers, may have a particular carrier space width. The particular carrier space width may include a frequency error associated with one or more optical signals of the respective optical signals. The optical system may include a control system to determine the frequency error and cause one or more of the optical transmitters to adjust the particular carrier space width based on the adjusted frequency error.

Abstract translation: 光学系统可以包括光发射器，以提供相应的光信号。 每个相应的光信号可以在光通道中提供一个或多个载波。 光信道可以包括与相应的光信号相关联的多个载波。 多载波的第一和第二载波可以具有特定载波空间宽度。 特定载波空间宽度可以包括与相应光信号的一个或多个光信号相关联的频率误差。 光学系统可以包括用于确定频率误差的控制系统，并且使得一个或多个光发射机基于调整的频率误差来调整特定载波空间宽度。

公开(公告)号：US20140294381A1

公开(公告)日：2014-10-02

申请号：US13853421

申请日：2013-03-29

Applicant: John D. MCNICOL ,  Han H. SUN ,  David J. KRAUSE

Inventor： John D. MCNICOL ,  Han H. SUN ,  David J. KRAUSE

IPC: H04B10/079 ,  H04J14/02

CPC classification number: H04J14/0224 ,  H04B10/0775 ,  H04B10/506 ,  H04B2210/072 ,  H04J14/0273

Abstract: An optical system may include optical transmitters to provide respective optical signals. Each of the respective optical signals may provide one or more carriers in an optical channel. The optical channel may include multiple carriers associated with the respective optical signals. First and second carriers, of the multiple carriers, may have a particular carrier space width. The particular carrier space width may include a frequency error associated with one or more optical signals of the respective optical signals. The optical system may include a control system to determine the frequency error and cause one or more of the optical transmitters to adjust the particular carrier space width based on the adjusted frequency error.

Abstract translation: 光学系统可以包括光发射器，以提供相应的光信号。 每个相应的光信号可以在光通道中提供一个或多个载波。 光信道可以包括与相应的光信号相关联的多个载波。 多载波的第一和第二载波可以具有特定载波空间宽度。 特定载波空间宽度可以包括与相应光信号的一个或多个光信号相关联的频率误差。 光学系统可以包括用于确定频率误差的控制系统，并且使得一个或多个光发射机基于调整的频率误差来调整特定载波空间宽度。

公开(公告)号：US08831439B2

公开(公告)日：2014-09-09

申请号：US12897786

申请日：2010-10-05

Applicant: Kuang-Tsan Wu ,  John D. McNicol ,  David F. Welch ,  Stephen G. Grubb ,  Pierre Mertz

Inventor： Kuang-Tsan Wu ,  John D. McNicol ,  David F. Welch ,  Stephen G. Grubb ,  Pierre Mertz

IPC: H04B10/04

CPC classification number: H04B10/516 ,  H04B10/2575

Abstract: Consistent with the present disclosure, data, in digital form, is received by a transmit nodes of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data. The modulated light is then transmitted over an optical communication path to a receive node. At the receive node, the modulated optical signal, as well as other modulated optical signals are supplied to a photodetector circuit, which receives additional light at one of the optical signal wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of individual channels is unnecessary.

Abstract translation: 与本公开一致，数字形式的数据由光通信的发射节点接收，并由数模转换器（DAC）转换为模拟信号以驱动调制器。 调制器又根据接收的数据调制多个波长中的一个波长的光。 然后将调制的光通过光通信路径传输到接收节点。 在接收节点处，调制的光信号以及其它调制的光信号被提供给光电检测器电路，光电检测器电路从本地振荡器激光器接收来自光信号波长之一的附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对来自ADC的输出进行滤波，使得各个信道的光解复用是不必要的。

公开(公告)号：US08477056B2

公开(公告)日：2013-07-02

申请号：US12791694

申请日：2010-06-01

Applicant: Han Henry Sun ,  Kuang-Tsan Wu ,  Yuejian Wu ,  Sandy Thomson ,  John D. McNicol ,  David J. Krause

Inventor： Han Henry Sun ,  Kuang-Tsan Wu ,  Yuejian Wu ,  Sandy Thomson ,  John D. McNicol ,  David J. Krause

IPC: H03M1/12

CPC classification number: H03H17/0621 ,  H03H17/0685 ,  H03H2017/0298

Abstract: A system, method, and apparatus is disclosed for interpolation of an output of an analog to digital converter (ADC) to enable operation of the ADC at a sampling rate that is independent of the sampling rate for a DSP core so as to efficiently enable operation at higher date rates. According to one of the embodiments, an interpolation circuit is coupled between the ADC and DSP core and receives a first plurality of samples of data at the first data rate from the ADC and supplies a plurality of samples of second data at a second data rate to the DSP core; the second data rate being less than the first data rate. According to one of the embodiments, the interpolation circuit includes a memory and a FIR filter circuit having filter tap coefficient values selected to provide attenuation at high frequencies to reduce aliasing noise.

Abstract translation: 公开了一种用于对模数转换器（ADC）的输出进行插值的系统，方法和装置，以使得能够以独立于DSP核的采样率的采样速率对ADC进行操作，以便有效地使能操作 以较高的日期率。 根据实施例之一，内插电路耦合在ADC和DSP内核之间，并从ADC接收第一数据速率的第一多个数据采样，并将第二数据的多个样本以第二数据速率提供给 DSP内核; 第二数据速率小于第一数据速率。 根据实施例中的一个，内插电路包括存储器和具有滤波器抽头系数值的FIR滤波器电路，该滤波器抽头系数值被选择以在高频率下提供衰减以减少混叠噪声。

公开(公告)号：US20120082460A1

公开(公告)日：2012-04-05

申请号：US12897788

申请日：2010-10-05

Applicant: Kuang-Tsan Wu ,  John D. McNicol ,  David F. Welch ,  Stephen G. Grubb ,  Pierre Mertz

Inventor： Kuang-Tsan Wu ,  John D. McNicol ,  David F. Welch ,  Stephen G. Grubb ,  Pierre Mertz

IPC: H04J14/02

CPC classification number: H04J14/0279 ,  H04B10/5053 ,  H04B10/616 ,  H04J14/0208 ,  H04J14/0212 ,  H04J14/0224 ,  H04J14/0256 ,  H04J14/0271 ,  H04J14/0272 ,  H04J14/06

Abstract: Consistent with the present disclosure, data, in digital form, is received by a transmit nodes of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data. The modulated light is then transmitted over an optical communication path to a receive node. At the receive node, the modulated optical signal, as well as other modulated optical signals are supplied to a photodetector circuit, which receives additional light at one of the optical signal wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of individual channels is unnecessary.

Abstract translation: 与本公开一致，数字形式的数据由光通信的发射节点接收，并由数模转换器（DAC）转换为模拟信号以驱动调制器。 调制器又根据接收的数据调制多个波长中的一个波长的光。 然后将调制的光通过光通信路径传输到接收节点。 在接收节点处，调制的光信号以及其它调制的光信号被提供给光电检测器电路，光电检测器电路从本地振荡器激光器接收来自光信号波长之一的附加光。 在接收节点中提供模数转换器（ADC），以将从光电检测器输出的电信号转换为数字形式。 然后在电域中对来自ADC的输出进行滤波，使得各个信道的光解复用是不必要的。

公开(公告)号：US5170495A

公开(公告)日：1992-12-08

申请号：US607385

申请日：1990-10-31

Applicant: John D. McNicol ,  Stephen G. Harman

Inventor： John D. McNicol ,  Stephen G. Harman

IPC: H03G3/30 ,  H03G3/20 ,  H03G11/04 ,  H04B1/04

CPC classification number: H03G3/3042 ,  H04B2001/0425

Abstract: In a QAM microwave radio communications system an IF (intermediate frequency) input signal is amplified and predistorted, and the amplified IF signal is mixed with a local oscillator signal to produce an RF (radio frequency) signal which is amplified in a power amplifier for transmission, the predistortion compensating for non-linear gain of the power amplifier. Clipping in the power amplifier is controlled by down-converting part of the RF signal to produce an IF output signal, monitoring amplitude distortion of the RF signal by comparing the IF output signal with the IF input signal, and controlling the IF amplifier gain in dependence upon the monitored amplitude distortion.

Abstract translation: 在QAM微波无线电通信系统中，IF（中频）输入信号被放大和预失真，并且放大的IF信号与本地振荡器信号混合以产生RF（射频）信号，该RF（射频）信号在用于传输的功率放大器中被放大 ，预失真补偿功率放大器的非线性增益。 功率放大器中的钳位通过下变频部分RF信号来控制，以产生IF输出信号，通过将IF输出信号与IF输入信号进行比较来监测RF信号的幅度失真，并依赖于IF放大器增益 受监控的幅度失真。

公开(公告)号：US09900124B2

公开(公告)日：2018-02-20

申请号：US13078895

申请日：2011-04-01

Applicant: John D. McNicol ,  Michael Francis Van Leeuwen

Inventor： John D. McNicol ,  Michael Francis Van Leeuwen

IPC: H04J14/02 ,  H04J14/06

CPC classification number: H04J14/06 ,  H04J14/02 ,  H04J14/0209 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0256

Abstract: Consistent with the present disclosure, data, in digital form, is received by a transmit node of an optical communication system, is processed and then output to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data, forming a plurality of corresponding carriers. The plurality of wavelengths used for the plurality of carriers are spectrally spaced apart by a common, periodic fixed spacing. The plurality of carriers are optically combined with a fixed spacing combiner to form a superchannel. A plurality of superchannels are generated and then multiplexed together onto an optical communication path and transmitted to a receive node. Each superchannel includes a plurality of carriers, each spectrally separated by the same fixed spacing. The plurality of superchannels are spectrally separated by an amount corresponding to the fixed spacing of the plurality of carriers. At the receive node, the superchannels are optically demultiplexed, and the plurality of carriers of a respective superchannel are then supplied to a photodetector circuit, which receives additional light at one of the optical signal carrier wavelengths from a local oscillator laser. The resultant signals are then processed electronically to separate the individual carriers and output data corresponding to the input data.