Adaptive digital self-interference cancellation based on fractional order LMS in LFMCW radar

• 作者: LUO Yongjiang BI Luhao ZHAO Dong
• 来源期刊: 系统工程与电子技术（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: DEFENCE ELECTRONICS TECHNOLOGY
• 页码范围: 573-583
• 页数: 11页
• 语种: 英文
• DOI: 10.23919/JSEE.2021.000049

摘要

Adaptive digital self-interference cancellation(ADSIC)is a significant method to suppress self-interference and im-prove the performance of the linear frequency modulated con-tinuous wave(LFMCW)radar.Due to efficient implementation structure,the conventional method based on least mean square(LMS)is widely used,but its performance is not sufficient for LFMCW radar.To achieve a better self-interference cancellation(SIC)result and more optimal radar performance,we present an ADSIC method based on fractional order LMS(FOLMS),which utilizes the multi-path cancellation structure and adaptively up-dates the weight coefficients of the cancellation system.First,we derive the iterative expression of the weight coefficients by using the fractional order derivative and short-term memory prin-ciple.Then,to solve the problem that it is difficult to select the parameters of the proposed method due to the non-stationary characteristics of radar transmitted signals,we construct the performance evaluation model of LFMCW radar,and analyze the relationship between the mean square deviation and the para-meters of FOLMS.Finally,the theoretical analysis and simula-tion results show that the proposed method has a better SIC performance than the conventional methods.