发明名称 |
Transmitter predistortion circuit and method therefor |
摘要 |
A digital communications transmitter ( 100 ) includes a digital linear-and-nonlinear predistortion section ( 200, 1800, 2800 ) to compensate for linear and nonlinear distortion introduced by transmitter-analog components ( 120 ). A direct-digital-downconversion section ( 300 ) generates a complex digital return-data stream ( 254 ) from the analog components ( 120 ) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream ( 254 ) is effectively increased through arithmetic processing. Distortion introduced by an analog-to-digital converter ( 304 ) may be compensated using a variety of adaptive techniques. Linear distortion is compensated using adaptive techniques with an equalizer ( 246 ) positioned in the forward-data stream ( 112 ). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers ( 226 ) that filter a plurality of orthogonal, higher-ordered-basis functions ( 214 ) generated from the forward-data stream ( 112 ). The filtered-basis functions are combined together and subtracted from the forward-data stream ( 112 ).
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申请公布号 |
US2005163252(A1) |
申请公布日期 |
2005.07.28 |
申请号 |
US20040012427 |
申请日期 |
2004.12.14 |
申请人 |
CRESTCOM, INC. |
发明人 |
MCCALLISTER RONALD D.;BROMBAUGH ERIC M. |
分类号 |
H03D3/24;H03F1/32;H03H7/30;H03H17/02;H04B1/04;H04K1/02;H04L5/06;H04L25/49;H04L27/10;H04L27/26;(IPC1-7):H04L27/10 |
主分类号 |
H03D3/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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