Estimation apparatus and method for a nonlinear characteristic
AssigneeFujitsu Limited
InventorsHao Chen, Lei Li, Zhenning Tao
Life of this patent
Estimating the term…
Abstract
Embodiments of the present disclosure provide an estimation apparatus and method for a nonlinear characteristic, which may simply and quickly estimate the nonlinear characteristic of a system to be measured by calculating parameters of the nonlinear model of the system to be measured according to the fundamental power and harmonic power of output signals of the system to be measured on at least two frequency spots obtained through measurement, with the accuracy of the result of estimation being relatively high.
Claims10
An estimation apparatus for estimating a nonlinear characteristic of a system to be measured of a communication system, to improve the communication system performance by dealing with the nonlinear characteristic of the system, the estimation apparatus is configured in one of an electronic equipment and a receiver and a transmitter of the communication system, the estimation apparatus comprising:
- a first calculating unit configured to respectively calculate groups of nonlinear coefficients of the nonlinear model of the system to be measured corresponding to frequency spots according to measured fundamental power and harmonic power of output signals of the system to be measured on at least two frequency spots, and take nonlinear coefficients corresponding to one of the at least two frequency spots as nonlinear coefficients of the nonlinear model of the system to be measured;
- a second calculating unit configured to calculate responses of a post-filter of the nonlinear model of the system to be measured according to the groups of nonlinear coefficients of the nonlinear model of the system to be measured corresponding to the frequency spots calculated by the first calculating unit;
- a third calculating unit configured to calculate responses of a pre-filter of the nonlinear model of the system to be measured according to measured linear filter responses of the system to be measured and the responses of the post-filter of the nonlinear model of the system to be measured calculated by the second calculating unit;
- and
- an estimating unit configured to estimate the nonlinear characteristic of the system to be measured according to the nonlinear coefficients of the nonlinear model of the system to be measured calculated by the first calculating unit, the responses of the post-filter of the nonlinear model of the system to be measured calculated by the second calculating unit and the responses of the pre-filter of the nonlinear model of the system to be measured calculated by the third calculating unit.
An estimation method applied in the estimation apparatus for a nonlinear characteristic of a system to be measured of a communication system, to improve the communication system performance by dealing with the nonlinear characteristic of the system, the estimation apparatus is configured in one of an electronic equipment and a receiver and a transmitter of the communication system, the estimation method comprising:
- respectively calculating groups of nonlinear coefficients of the nonlinear model of the system to be measured corresponding to frequency spots according to measured fundamental power and harmonic power of output signals of the system to be measured on at least two frequency spots, and taking nonlinear coefficients corresponding to one of the at least two frequency spots as nonlinear coefficients of the nonlinear model of the system to be measured;
- calculating responses of a post-filter of the nonlinear model of the system to be measured according to the groups of nonlinear coefficients of the nonlinear model of the system to be measured corresponding to the frequency spots;
- calculating responses of a pre-filter of the nonlinear model of the system to be measured according to measured linear filter responses of the system to be measured and the responses of the post-filter of the nonlinear model of the system to be measured;
- and
- estimating the nonlinear characteristic of the system to be measured according to the nonlinear coefficients of the nonlinear model of the system to be measured, the responses of the post-filter of the nonlinear model of the system to be measured and the responses of the pre-filter of the nonlinear model of the system to be measured.
Dependencies are inferred from the claim text.