Broadcast transmission system with single correction filter for correcting linear and non-linear distortion
US6501805B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1999 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3258
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a digital broadcast transmission system (60), a power amplifier (66) amplifies an information signal to a power level suitable to excite an antenna to emit a broadcast signal. Prior to, an subsequent to, the amplification processing circuitry (68, 70) processes the signal. In particular, the information signal is bandpass filtered. The power amplifier (66) causes non-linear distortion to the information signal. The processing circuitry (68, 70) causes linear distortions to the information signal. A single, memoryful filter (76) pre-distorts the information signal to compensate for all of the linear and non-linear distortions. Preferably, the memoryful filter (76) is a volterra filter. In another embodiment, a memoryful filter (112) pre-distorts an information signal to compensate for linear distortion from a power amplifier (102) and non-linear distortion from pre-amplification processing circuitry (104). Linear distortion from post-amplification processing circuitry is compensated by a linear equalizer (114). For each embodiment, the number of compensation steps is reduced compared to a sequence in which separate compensation occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.