发明名称 |
TRANSMITTER PREDISTORTION CIRCUIT AND METHOD THEREFOR |
摘要 |
<p>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).</p> |
申请公布号 |
WO2005074121(A1) |
申请公布日期 |
2005.08.11 |
申请号 |
WO2005US02316 |
申请日期 |
2005.01.24 |
申请人 |
CRESTCOM, INC.;MCCALLISTER, RONALD, D. |
发明人 |
MCCALLISTER, RONALD, D. |
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):H03D3/24 |
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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