IQ不平衡下全双工非线性自干扰频域对消  

Frequency-domain nonlinear interference cancellation scheme with IQ imbalance in full-duplex systems

作　　者：何怡敏 赵宏志[1] 邵士海[1] Yimin HE;Hongzhi ZHAO;Shihai SHAO(National Key Laboratory of Science and Technology on Communications,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室,成都611731

出　　处：《中国科学：信息科学》2023年第6期1212-1229,共18页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:62071094,61901396)资助项目。

摘　　要：在全双工自干扰信道反射径较多的情况下,针对已有时域自干扰对消方案复杂度高的问题,提出了一种低复杂度的频域自干扰对消方案.该方案以全双工零中频架构为基础,综合考虑了IQ不平衡以及功放非线性对自干扰重建模型的影响,优化了已有频域自干扰重建模型的准确度.在此基础上,利用正交化辅助的连续干扰对消技术实现了低复杂度的自干扰消除.仿真分析表明,所提方案相比已有的基于RLS算法的频域自干扰对消方案,能够在存在IQ不平衡以及功放非线性的情况下实现几乎相同的自干扰对消性能,但是降低了68.75%的复杂度.In this article,a novel frequency-domain(FD) self-interference cancellation method is proposed for full-duplex systems that reduces the complexity of existing time-domain,self-interference cancellation methods,as the reflection paths of self-interference are rich.Based on direct conversion full-duplex architecture,we improve the accuracy of the self-interference model by jointly considering IQ imbalance and power amplifier(PA) nonlinearity.Then,self-interference cancellation with low complexity is realized by performing orthogonalization-assisted successive interference cancellation.Simulation results show that the proposed method achieves a performance equivalent to that of the existing RLS-based FD self-interference cancellation method in the presence of IQ imbalance and PA nonlinearity,while reducing computational cost by 68.75%.

关 键 词：全双工 自干扰对消 IQ不平衡 非线性 频域 

分 类 号：TN972[电子电信—信号与信息处理]