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    • 23. 发明授权
    • Non-linear subcarrier predistortion and upconversion system
    • 非线性副载波预失真和上变频系统
    • US06587257B1
    • 2003-07-01
    • US09347899
    • 1999-07-01
    • Robert James Davies
    • Robert James Davies
    • G02F135
    • G02F1/353G02F2001/212
    • A method and apparatus for harmonically upconverting a phase and/or amplitude modulated subcarrier signal to a higher frequency through a non-linear optical link is disclosed. The method requires that a bandpass signal, with a carrier frequency at a submultiple of the desired radio transmission frequency, be frequency translated in a non-linear two-port device. To avoid the inherent distortion inflicted on the information signal in harmonic upconversion, a predistortion technique is outlined. This consists of phase compression in the case of a phase modulated signal, amplitude scaling in the case of amplitude only and combined phase-amplitude predistortion for QAM type signals. With predistortion on the subcarrier signal input to the non-linear two-port, the resulting upconverted signal may be transmitted in a standard form suitable for demodulation at the signal destination without special equipment.
    • 公开了一种用于通过非线性光学链路将相位和/或幅度调制子载波信号谐波上变频到较高频率的方法和装置。 该方法要求将具有所需无线电传输频率的多个载波频率的带通信号在非线性双端口设备中频率转换。 为了避免在谐波上变频中对信号信号造成的固有失真,概述了预失真技术。 在相位调制信号的情况下,包括相位压缩,仅在振幅情况下的幅度缩放,以及用于QAM型信号的组合相位幅度预失真。 通过对输入到非线性双端口的子载波信号进行预失真,可以在没有特殊设备的情况下以适合于在信号目的地解调的标准形式来发送所产生的上变频信号。