单比特量化软件接收机中的鲁棒数字鉴相器

Robust digital phase discriminator in one-bit quantized software-defined receivers

提出一种新的应用于单比特量化软件接收机中的鉴相器——鲁棒数字鉴相器。与已有的数字鉴相器不同,提出的鉴相器是对I、Q两路的载波相位分别进行估计,再进行线性融合,从而提供了比数字鉴相器更好的精度和鲁棒性。分析与仿真结果表明,无论是在高信噪比还是低信噪比环境下,在单比特量化接收机中,提出的鉴相器估计精度均优于传统的反正切鉴相器和数字鉴相器,具有良好的性能和鲁棒性。

This paper presents a novel phase discriminator called robust digital phase discriminator（RDPD） for one-bit analog-to-digital conversion（ADC） software-defined receivers.Differing from the existing digital phase discriminator（DPD）,the proposed RDPD estimates carrier phases of I-branch and Q-branch separately and then fuses the estimation results to achieve a higher precision and better robustness.Analysis and simulation results indicate that the proposed RDPD outperforms traditional arctangent phase discriminator（APD） and DPD in estimation precision whether the signal-to-noise ratio（SNR） is high or low.