US 12,457,041 B2
Apparatus and method for measuring nonlinear system noises
Jingnan Li, Beijing (CN); and Zhenning Tao, Beijing (CN)
Assigned to Fujitsu Limited, Kawasaki (JP)
Filed by Fujitsu Limited, Kawasaki (JP)
Filed on May 2, 2023, as Appl. No. 18/311,080.
Claims priority of application No. 202210502703.9 (CN), filed on May 10, 2022.
Prior Publication US 2023/0370168 A1, Nov. 16, 2023
Int. Cl. H04B 10/58 (2013.01); H04B 10/2575 (2013.01); H04B 10/61 (2013.01)
CPC H04B 10/58 (2013.01) [H04B 10/25759 (2013.01); H04B 10/6163 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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.