RF transmitter with predistortion and method therefor
US7724840B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2006 |
| Grant date | May 25, 2010 |
| Priority date | — |
| Expiry date | Feb 23, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03687
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An RF transmitter (10) includes a linear predistorter (22) and a nonlinear predistorter (24) which together drive analog transmitter components (14). The linear and nonlinear predistorters (22, 24) are implemented using a collection of adaptive equalizers (30). A feedback signal (20) is developed by downconverting an RF communication signal (16) obtained from the analog components (14). The feedback signal (20) are used in driving tap coefficients (34) for the adaptive equalizers (30′, 30″) in the nonlinear predistorter (24). An intermodulation-product canceller (94) uses signal cancellation to cancel intermodulation products from the feedback signal (20) and generate an intermodulation-neutralized feedback signal (96). The intermodulation-neutralized feedback signal (96) is used along with a modulated convergence factor (43) in driving tap coefficients (34) for the adaptive equalizer (30) in the linear predistorter (22).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.