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公开(公告)号:US5418818A
公开(公告)日:1995-05-23
申请号:US950241
申请日:1992-09-22
申请人: Robert F. Marchetto , Todd A. Stewart , Paul A. Goud , David W. Kroeger , Charles B. Cox , Timothy J. Linderer , Richard J. Hinkle , Robert J. Shade
发明人: Robert F. Marchetto , Todd A. Stewart , Paul A. Goud , David W. Kroeger , Charles B. Cox , Timothy J. Linderer , Richard J. Hinkle , Robert J. Shade
CPC分类号: H03C1/00
摘要: A digital exciter (30) for selectively modulating digital or analog input data. The digital exciter includes a digital signal modulator (32) and a digital quadrature modulator (DQM)(36) comprising two digital signal processors (DSPs). The signal modulator is controlled by a control (40). An operator can selectively determine whether the digital exciter is used for modulating either two level or four level NRZ digital data and whether the device is to provide linear modulation or frequency modulation (FM) of the input signal. An interpolator (38) interpolates a 662/3 kHz timer interrupt rate used in the signal modulator to a 400 kHz rate, thereby reducing the processing load on the DSP comprising the DQM by simplifying the sine and cosine values used in the quadrature modulation. An operator can select from among a plurality of operating parameters on a menu for controlling the signal modulator, either from a local or a remote video display terminal (VDT).
摘要翻译: 一种用于选择性地调制数字或模拟输入数据的数字激励器(30)。 数字激励器包括数字信号调制器(32)和包括两个数字信号处理器(DSP)的数字正交调制器(DQM)(36)。 信号调制器由控制器(40)控制。 操作者可以选择性地确定数字激励器是用于调制两级或四级NRZ数字数据以及该装置是否提供输入信号的线性调制或调频(FM)。 内插器(38)将在信号调制器中使用的662 / 3kHz定时器中断速率内插到400kHz速率,从而通过简化在正交调制中使用的正弦和余弦值来减少包括DQM的DSP的处理负载。 操作员可以从用于从本地或远程视频显示终端(VDT)控制信号调制器的菜单上的多个操作参数中进行选择。
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公开(公告)号:US5732333A
公开(公告)日:1998-03-24
申请号:US601118
申请日:1996-02-14
申请人: Charles Brian Cox , David Kent Bonds , Jay Jui-Chieh Chen , Flaviu C. Costescu , Joel Richard Dierks , Wayne Douglas Duello , Thomas L. Frederick , Paul A. Goud , Derek Stephen Hilborn , Richard Johnathan Hinkle , Terry Lee Hinkle , David E. Jones , Theron Lee Jones , Patricia Fern Kavanagh , David W. Kroeger , Robert Richard Leyendecker , Vladimir Pavlovic , Claudio Gustavo Rey , Ray M.R. Sewlochan , Emre Tapucu , Mark A. Walker
发明人: Charles Brian Cox , David Kent Bonds , Jay Jui-Chieh Chen , Flaviu C. Costescu , Joel Richard Dierks , Wayne Douglas Duello , Thomas L. Frederick , Paul A. Goud , Derek Stephen Hilborn , Richard Johnathan Hinkle , Terry Lee Hinkle , David E. Jones , Theron Lee Jones , Patricia Fern Kavanagh , David W. Kroeger , Robert Richard Leyendecker , Vladimir Pavlovic , Claudio Gustavo Rey , Ray M.R. Sewlochan , Emre Tapucu , Mark A. Walker
CPC分类号: H03C3/406 , H03F1/3247 , H03F1/3294 , H03F2201/3233 , H04B2001/0425
摘要: A linear transmitter (101) using predistortion includes a modulator (103), a predistorter (107), a digital quadrature modulator (111), an upconverter (113), a power amplifier (115), and an antenna (117). In addition, the transmitter (101) has a feedback loop including a coupler (119), a downconverter (123), a digital quadrature demodulator (125), and a trainer (131). The digital data to be transmitted is provided into the modulator (103), which converts the digital data into in-phase and quadrature component signals. The in-phase and quadrature component signals are then provided to the predistorter (107), which "predistorts" the component signals prior to amplification. The digital quadrature modulator (111) converts the component signals into a single analog signal. The upconverter (113) upconverts this signal from the predistorter (107) into the desired frequency of transmission, which is provided to the power amplifier (115) and the antenna (117) for amplification and broadcast. The coupler (119) provides a portion of the amplified signal to the analog downconverter (123), which lowers the frequency of this signal to a range that is easily processed. The signal is then provided to the digital quadrature demodulator (125), which outputs the in-phase and quadrature component signals of the signal. These in-phase and quadrature component signals are provided to the trainer (131) which analyzes them with the output signals from the modulator. The trainer (131) compares these signals and updates the predistorter (107) so that the digital quadrature demodulator (125) output signals are substantially equivalent to the modulator (103) output signals.
摘要翻译: 使用预失真的线性发射机(101)包括调制器(103),预失真器(107),数字正交调制器(111),上变频器(113),功率放大器(115)和天线(117)。 另外,发射机(101)具有包括耦合器(119),下变频器(123),数字正交解调器(125)和训练器(131)的反馈回路。 要发送的数字数据被提供给调制器(103),其将数字数据转换成同相和正交分量信号。 然后将同相和正交分量信号提供给预失真器(107),其在放大之前“分段”分量信号。 数字正交调制器(111)将分量信号转换为单个模拟信号。 上变频器(113)将该信号从预失真器(107)上变频成期望的发送频率,其被提供给用于放大和广播的功率放大器(115)和天线(117)。 耦合器(119)将放大信号的一部分提供给模拟下变频器(123),这将该信号的频率降低到容易处理的范围。 然后将信号提供给数字正交解调器(125),其输出信号的同相和正交分量信号。 这些同相和正交分量信号被提供给训练器(131),其利用来自调制器的输出信号对它们进行分析。 训练器(131)比较这些信号并更新预失真器(107),使得数字正交解调器(125)输出信号基本上等于调制器(103)的输出信号。
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