公开(公告)号：US09749161B1

公开(公告)日：2017-08-29

申请号：US15051120

申请日：2016-02-23

Applicant: Freescale Semiconductor, Inc.

Inventor： Avraham D. Gal ,  Roi M. Shor ,  Igor Levakov

IPC: H04B1/62 ,  H04L25/03 ,  H04B1/04

CPC classification number: H04L25/03885 ,  H04B1/0475 ,  H04B2001/0425 ,  H04L25/03057 ,  H04L2025/03681

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.

公开(公告)号：US20170244582A1

公开(公告)日：2017-08-24

申请号：US15051120

申请日：2016-02-23

Applicant: Freescale Semiconductor, Inc.

Inventor： Avraham D. Gal ,  Roi M. Shor ,  Igor Levakov

IPC: H04L25/03 ,  H04B1/04

CPC classification number: H04L25/03885 ,  H04B1/0475 ,  H04B2001/0425 ,  H04L25/03057 ,  H04L2025/03681

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.