发明名称 |
Digital pre-distortion of input signals for reducing spurious emissions in communication networks |
摘要 |
Pre-distortion, whose magnitude-and preferably phase-are frequency-dependent, is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion technique of the present invention is implemented in combination with the (frequency-independent) magnitude and phase pre-distortion technique described in U.S. patent application Ser. No. 09/395,490 ("the '490 application"), where the frequency-dependent pre-distortion corresponds to amplifier distortion that has a magnitude that is proportional to the frequency offset from the carrier frequency and a phase shift of ±90° on either side of the carrier frequency. The frequency-dependent pre-distortion is generated by differentiating waveforms corresponding to pre-distortion parameters with respect to time and then applying the resulting differentiated pre-distortion parameters to the input signal. Depending on the implementation, the waveforms may be differentiated in either the analog or digital domain.
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申请公布号 |
US2003227981(A1) |
申请公布日期 |
2003.12.11 |
申请号 |
US20020217930 |
申请日期 |
2002.08.13 |
申请人 |
ANDREW CORPORATION, A DELAWARE CORPORATION |
发明人 |
VELLA-COLEIRO GEORGE P.;YANG RUIKANG |
分类号 |
H04L27/36;(IPC1-7):H04K1/02;H04L25/03 |
主分类号 |
H04L27/36 |
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