Distortion compensating apparatus, transmitter, distortion compensating method, and transfer function calculating method
US9143091B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2013 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | Dec 25, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2201/3224
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An amplifier module is expressed by a model having a first filter that is a linear time-invariant filter for limiting the bandwidth of an input signal, an amplifier unit that amplifies a signal output from the first filter, and a second filter that is a linear time-invariant filter for limiting the bandwidth of a signal output from the amplifier unit. A memoryless amplifier unit calculates an output from the amplifier module when being memoryless, using AM-to-AM distortion and AM-to-PM distortion of the amplifier unit. A cross-correlation calculating unit calculates a correlation between the signal output from the amplifier module and the output calculated by the memoryless amplifier unit and calculates an estimate of a transfer function of the first filter and the second filter. A distortion compensating unit compensates the input signal based on the estimate of the transfer function and outputs the signal to the amplifier module.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.