电讯技术2024，Vol.64Issue(1)：120-125,6.DOI:10.20079/j.issn.1001-893x.230725003
调制解调非理想特性联合补偿数字预失真方法
A Modulation and Demodulation Non-ideal Characteristic Joint Compensation Digital Predistortion Method
摘要
Abstract
In view of the problem that the non-ideal characteristics of modulation and demodulation affect the digital predistortion effect and lead to poor performance of adjacent channel power ratio,a digital predistortion method with joint compensation at the modulation and demodulation ends is proposed.Firstly,the baseband equivalent models of orthogonal modulators and demodulators are established.Then,based on polynomial predistortion and by utilizing the characteristics of orthogonal modulators and demodulators,combined with recursive least squares method,the principle of joint compensation for digital predistortion is derived,avoiding the phenomenon of only compensating the modulation end or compensating the modulation end and demodulation end separately,which can only make the digital predistortion algorithm converge to the local optimal solution.Finally,by taking the commonly used differential 8 phase shift keying(D8PSK)modulation method in very high frequency aviation communication as an example,simulation and implementation verification is conducted,the adjacent channel power ratio can be improved by 28 dBc compared with that of the method without predistortion,and by 16 dBc compared with that of existing joint compensation digital predistortion.关键词
甚高频航空通信/数字预失真/非理想特性/基带等效模型/联合补偿Key words
VHF aviation communication/digital predistortion/non-ideal characteristics/baseband equivalent model/joint compensation分类
信息技术与安全科学引用本文复制引用
姚元飞,张小舟,蔡方凯,李晓钰..调制解调非理想特性联合补偿数字预失真方法[J].电讯技术,2024,64(1):120-125,6.基金项目
教育部第二批新工科研究与实践项目(E-XTYR20200661) （E-XTYR20200661）
四川省科技成果转移转化示范项目(2020ZHZY0010) （2020ZHZY0010）
成都工业学院引进人才科研启动项目(2022RC006) （2022RC006）
