宽带数字接收机IQ不平衡估计与自适应补偿算法

针对宽带调制解调技术中广泛存在的IQ不平衡问题,在IQ不平衡模型及补偿原理的分析基础上提出了一种宽带数字接收机IQ不平衡估计与自适应补偿算法。首先利用解调数据对IQ不平衡参数进行实时估计,然后利用估计参数对接收信号进行自适应补偿。实验结果表明,所提算法可以有效解决宽带调制解调系统中普遍存在的IQ不平衡问题,提升系统误码性能。

An IQ Imbalance Estimation and Adaptive Compensation Algorithm in Broadband Digital Receivers

The IQ imbalance problem widely appears in broadband modulation and demodulation technology.According to the analysis of IQ unbalance model and compensation principle,an adaptive compensation algorithm for IQ imbalance is proposed.The algorithm first uses the receiver data to estimate the unbalanced parameters in real time,and compensates the received signal with the estimated parameters adaptively.The experimental results show that the proposed algorithm can effectively overcome the IQ imbalance in broadband modulation and demodulation systems,and also significantly improve the system performance.