| Title |
RLS Implementation of Two-input Cubic Volterra Filters for Third-order PIMD Modeling |
| Authors |
임성빈(Sungbin Im) ; 김보배(Bobae Kim) ; 김지혜(Zhihui Jin) ; 송금자(Jinzi Song) ; 최준규(Jungyu Choi) |
| DOI |
https://doi.org/10.5573/ieie.2021.58.12.3 |
| Keywords |
Wireless communication system; PIMD; regression implementation; modeling |
| Abstract |
Passive elements in a wireless distributed antenna system can nonlinearly distort transmission signals of different frequency bands, which result in unexpected signals in the adjacent bands. This is called passive intermodulation distortion (PIMD). Unfortunately, PIMD sometimes is introduced into the mobile communication network's uplink band as interference, which lowers the network performance. For mitigating PIMD, the models descrbing the relationship between the downlink signals and the PIMD are required. In this paper, the two-input cubic Volterra filter (CVF) is employed for the model. In addition, since the passive components are time varying due to aging and operating temperature, the model should reflect this property. For this reason, we develop a RLS-based recursive implementation of the 2-input CVF, and investigate the performance of the proposed implementation compared to the batch approach. The experiments with simulated and measured data demonstrate that the proposed one is compatible with the batch approach. |