Apparatus and method for measuring nonlinear system noises
AssigneeFujitsu Limited
InventorsJingnan Li, Zhenning Tao
Life of this patent
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Abstract
An apparatus and method to measure nonlinear system noises may include a processor to generate a bilateral notch signal, a unilateral notch signal and a multi-tone signal; to measure power of an additive Gaussian white noise of a nonlinear system by using the multi-tone signal; to measure a first power-to-noise ratio of the nonlinear system by using the bilateral notch signal; to measure a second power-to-noise ratio of the nonlinear system by using the unilateral notch signal. The processor is to calculate a nonlinear power-to-noise ratio of the nonlinear system and a power-to-noise ratio introduced by IQ imbalance according to the power of the additive Gaussian white noise, the first power-to-noise ratio and the second power-to-noise ratio.
Claims9
An apparatus to measure nonlinear system noises, the apparatus comprising:
- a memory;
- and
- a processor coupled to the memory to control execution of a process to,
- generate a bilateral notch signal and a unilateral notch signal in which notch depths of the bilateral notch signal and the unilateral notch signal are greater than or equal to a preset depth,
- generate a multi-tone signal via transmitter digital signal processing, such that a frequency interval of the multi-tone signal is greater than or equal to a notch bandwidth of the unilateral notch signal or the bilateral notch signal, and the multi-tone signal is generated by adjusting initial phases of different single-tone signals so that a peak-to-average power ratio of the multi-tone signal is close to that of the unilateral notch signal or the bilateral notch signal;
- measure a power of an additive Gaussian white noise of a nonlinear system by using the multi-tone signal;
- measure a first power-to-noise ratio of the nonlinear system by using the bilateral notch signal;
- measure a second power-to-noise ratio of the nonlinear system by using the unilateral notch signal;
- and
- calculate a nonlinear power-to-noise ratio of the nonlinear system and a power-to-noise ratio introduced by IQ imbalance, according to the power of the additive Gaussian white noise, the first power-to-noise ratio and the second power-to-noise ratio.
Dependencies are inferred from the claim text.