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    • 4. 发明申请
    • Simplified Digital Predistortion in a Time-Domain Duplexed Transceiver
    • 时域双工收发器中的简化数字预失真
    • US20080144539A1
    • 2008-06-19
    • US11610563
    • 2006-12-14
    • Roland SperlichGregory C. Copeland
    • Roland SperlichGregory C. Copeland
    • H04J3/00
    • H04L25/0286H04L5/1469H04L27/368
    • A transceiver for time-domain duplexed (TDD) communications, for example in connection with wireless broadband data communications, is disclosed. The transceiver includes digital predistortion compensation circuitry, which compensates the digital signals to be transmitted based on feedback signals from the output of the power amplifier, in order to linearize the output from the power amplifier. The feedback signals from the power amplifier are coupled back to the digital predistortion circuitry over part of the same receive path as the received signals from the wireless communications channel. The shared path includes analog-to-digital converters that are used both in the transmit period of the TDD cycle to convert the feedback signals from the power amplifier output, and in the receive period of the TDD cycle to convert the analog received signals.
    • 公开了一种用于例如与无线宽带数据通信有关的时域双工(TDD)通信的收发器。 收发器包括数字预失真补偿电路,其基于来自功率放大器的输出的反馈信号来补偿要传输的数字信号,以便使功率放大器的输出线性化。 来自功率放大器的反馈信号通过与来自无线通信信道的接收信号相同的接收路径的一部分而耦合回数字预失真电路。 共享路径包括在TDD周期的发射周期中用于转换来自功率放大器输出的反馈信号以及TDD周期的接收周期以转换模拟接收信号的模数转换器。
    • 6. 发明授权
    • Distortion compensation in a communication system
    • 通信系统中的失真补偿
    • US07778345B2
    • 2010-08-17
    • US11936551
    • 2007-11-07
    • Roland SperlichGregory C. Copeland
    • Roland SperlichGregory C. Copeland
    • H04B15/00H04B1/10H04L25/49
    • H03F1/3247H03F1/3241H04B2001/0425
    • In one embodiment of the invention, a modulator mixes a transmit-path signal based on a local oscillator (LO) signal and an amplifier amplifies the mixed transmit-path signal to generate an output signal for transmission. A demodulator generates a receive-path signal based on the output signal and the LO signal. Phase-shift control components provide the output signal and the LO signal to the demodulator during a first time duration and provide a phase-shifted version of one of the output signal and the LO signal to the demodulator during a second time duration. The demodulator generates a second receive-path signal based on the one of the phase-shifted output signal and the phase-shifted LO signal during the second time duration. At least one predistortion circuit adjusts at least one of the transmit-path signal and the receive-path signal based on a difference in signal characteristics of the receive-path signal during the second time duration relative to the first time duration.
    • 在本发明的一个实施例中,调制器基于本地振荡器(LO)信号来混合发射路径信号,并且放大器放大混合的发射路径信号以产生用于传输的输出信号。 解调器基于输出信号和LO信号产生接收路径信号。 相移控制部件在第一持续时间期间向解调器提供输出信号和LO信号,并且在第二持续时间期间向解调器提供输出信号和LO信号之一的相移版本。 解调器在第二持续时间期间基于相移输出信号和相移LO信号中的一个产生第二接收路径信号。 至少一个预失真电路基于在相对于第一持续时间的第二持续时间期间的接收路径信号的信号特性的差异来调整发射路径信号和接收路径信号中的至少一个。
    • 7. 发明授权
    • Simplified digital predistortion in a time-domain duplexed transceiver
    • 时域双工收发器中的简化数字预失真
    • US07783263B2
    • 2010-08-24
    • US11610563
    • 2006-12-14
    • Roland SperlichGregory C. Copeland
    • Roland SperlichGregory C. Copeland
    • H04B7/005H04J3/00
    • H04L25/0286H04L5/1469H04L27/368
    • A transceiver for time-domain duplexed (TDD) communications, for example in connection with wireless broadband data communications, is disclosed. The transceiver includes digital predistortion compensation circuitry, which compensates the digital signals to be transmitted based on feedback signals from the output of the power amplifier, in order to linearize the output from the power amplifier. The feedback signals from the power amplifier are coupled back to the digital predistortion circuitry over part of the same receive path as the received signals from the wireless communications channel. The shared path includes analog-to-digital converters that are used both in the transmit period of the TDD cycle to convert the feedback signals from the power amplifier output, and in the receive period of the TDD cycle to convert the analog received signals.
    • 公开了一种用于例如与无线宽带数据通信有关的时域双工(TDD)通信的收发器。 收发器包括数字预失真补偿电路,其基于来自功率放大器的输出的反馈信号来补偿要传输的数字信号,以便使功率放大器的输出线性化。 来自功率放大器的反馈信号通过与来自无线通信信道的接收信号相同的接收路径的一部分而耦合回数字预失真电路。 共享路径包括在TDD周期的发射周期中用于转换来自功率放大器输出的反馈信号以及TDD周期的接收周期以转换模拟接收信号的模数转换器。
    • 8. 发明申请
    • DISTORTION COMPENSATION IN A COMMUNICATION SYSTEM
    • 通信系统中的失真补偿
    • US20090116578A1
    • 2009-05-07
    • US11936551
    • 2007-11-07
    • Roland SperlichGregory C. Copeland
    • Roland SperlichGregory C. Copeland
    • H04B15/00
    • H03F1/3247H03F1/3241H04B2001/0425
    • In one embodiment of the invention, a modulator mixes a transmit-path signal based on a local oscillator (LO) signal and an amplifier amplifies the mixed transmit-path signal to generate an output signal for transmission. A demodulator generates a receive-path signal based on the output signal and the LO signal. Phase-shift control components provide the output signal and the LO signal to the demodulator during a first time duration and provide a phase-shifted version of one of the output signal and the LO signal to the demodulator during a second time duration. The demodulator generates a second receive-path signal based on the one of the phase-shifted output signal and the phase-shifted LO signal during the second time duration. At least one predistortion circuit adjusts at least one of the transmit-path signal and the receive-path signal based on a difference in signal characteristics of the receive-path signal during the second time duration relative to the first time duration.
    • 在本发明的一个实施例中,调制器基于本地振荡器(LO)信号来混合发射路径信号,并且放大器放大混合的发射路径信号以产生用于传输的输出信号。 解调器基于输出信号和LO信号产生接收路径信号。 相移控制部件在第一持续时间期间向解调器提供输出信号和LO信号,并且在第二持续时间期间向解调器提供输出信号和LO信号之一的相移版本。 解调器在第二持续时间期间基于相移输出信号和相移LO信号中的一个产生第二接收路径信号。 至少一个预失真电路基于在相对于第一持续时间的第二持续时间期间的接收路径信号的信号特性的差异来调整发射路径信号和接收路径信号中的至少一个。
    • 9. 发明授权
    • Video finger print method and apparatus
    • 视频指纹方法和装置
    • US5668603A
    • 1997-09-16
    • US651480
    • 1996-05-22
    • Gregory C. Copeland
    • Gregory C. Copeland
    • G06F7/72G06F21/10G11B20/00H04N5/913H04N7/08H04N7/081H04N7/16
    • H04N21/8358G11B20/00086G11B20/00094G11B20/0021G11B20/00913H04N5/913H04N7/08H04N7/165G06F7/725H04N2005/91335
    • A method and apparatus for inserting source identification data into a video signal prior to its transmission, recording or display. The source identification data (Finger Print) is injected into the active picture area of a video signal without disturbing the viewing of the video signal and the data is retrieved by a data reader, called a Fingerprint Reader. The data injection or "fingerprinting" process consists of dynamically offsetting the video pedestal to carry information which can then be read back from any videotape made from the output of the data-injecting unit. In particular, the fingerprint carries the ID number of the unit used and the current date. The offset lasts for one entire field and has an amplitude of approximately 0.5 IRE--that is, a given field either has the nominal setup or a setup value differing from nominal by 0.5 IRE. The data is repeated every 128 fields in order to provide ample samples for the reader to detect and display the source identification data.
    • 一种用于在其发送,记录或显示之前将源标识数据插入到视频信号中的方法和装置。 源识别数据(Finger Print)被注入到视频信号的活动图像区域中,而不会影响视频信号的观看,并且数据被称为指纹读取器的数据读取器检索。 数据注入或“指纹”过程包括动态地偏移视频基座以携带信息,然后可以从由数据注入单元的输出形成的任何录像带读回。 特别地,指纹携带使用的单位的ID号和当前日期。 偏移量持续一个整个场,并且具有大约0.5IRE的幅度,也就是说,给定场具有标称设置或设置值与标称值不同,为0.5IRE。 每128个字段重复数据,以便为读者提供足够的样本来检测和显​​示源标识数据。
    • 10. 发明授权
    • Crest factor reduction processor for wireless communications
    • 用于无线通信的波峰因数降低处理器
    • US07697591B2
    • 2010-04-13
    • US10643179
    • 2003-08-18
    • Gregory C. Copeland
    • Gregory C. Copeland
    • H04B1/00
    • H04B1/707H04B2201/70706
    • A wireless base station (15) for transmitting spread spectrum signals is disclosed. The base station (15) includes a peak compression unit (16), which is comprised of a sequence of peak detection and cancellation circuits (32). Each peak detection and cancellation circuit (32) detects and compresses identified peaks. The further stages of peak detection and cancellation circuits (32) serve to reduce peaks that, as a result of “peak regrowth”, are caused at sample points near to a reduced peak point. According to one disclosed embodiment, a peak sample point is not qualified for compression unless a number of sample points subsequent to the peak all have lower magnitude than that of the peak. The cancellation pulses applied by the peak detection and cancellation circuits (32) may be generated by a finite impulse response (FIR) filter pulse, or alternatively by a minimum phase infinite impulse response (IIR) pulse. The peak compression unit (16) identifies and compresses statistical peaks in the digital symbol amplitude, so that the dynamic range requirements of the power amplifier (24) in the base station (15) may be relaxed.
    • 公开了一种用于发射扩频信号的无线基站(15)。 基站(15)包括由峰值检测和消除电路(32)的序列组成的峰值压缩单元(16)。 每个峰值检测和消除电路(32)检测和压缩识别的峰值。 峰值检测和消除电路(32)的进一步阶段用于减少由于“峰值再生长”而导致的峰值接近于降低的峰值点处的峰值。 根据一个公开的实施例,峰值采样点不符合压缩条件,除非峰值之后的多个采样点都具有比峰值更低的幅度。 由峰值检测和消除电路(32)施加的消除脉冲可以由有限脉冲响应(FIR)滤波器脉冲或者替代地由最小相位无限脉冲响应(IIR)脉冲产生​​。 峰值压缩单元(16)识别和压缩数字符号振幅中的统计峰值,使得基站(15)中的功率放大器(24)的动态范围要求可以被放宽。