Fixed-point conjugate gradient digital pre-distortion (DPD) adaptation
US9749161B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2016 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Feb 23, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03681
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A predistortion method and apparatus are provided which use a DPD actuator (225) to apply a memory polynomial formed with first DPD coefficients to a first input signal x[n], thereby generating a first pre-distorted input signal y[n] which is provided to the non-linear electronic device (253) to produce the output signal, where the memory polynomial may be adaptively modified with a digital predistortion adapter (224) which computes second DPD coefficients u[n] with an iterative fixed-point conjugate gradient method which uses N received digital samples of the first pre-distorted input signal y[n] and a feedback signal z[n] captured from the output signal to process a set of conjugate gradient parameters (u, b, v, r, ω, α, β) at each predetermined interval, thereby updating the first DPD coefficients with the second DPD coefficients u[n] generate a second pre-distorted input signal which is provided to the non-linear electronic device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.