中文摘要：

首先,提出了一种基于自动增益控制（automatic gain control,AGC）技术的自适应干扰对消系统,并对该对消系统进行了建模与理论分析;然后,研究了AGC对消系统的收敛时间、干扰对消比和有用信号损耗特性,并分析了零漂对系统性能的影响。分析结果表明：使用该对消系统可有效降低零漂对系统性能的影响;在干扰信号功率较小时,也可得到较高的干扰对消比和较快的收敛速度。实验结果也验证了理论分析的正确性和AGC技术的有效性。

英文摘要：

An adaptive interference cancellation system （AICS） based on automatic gain control （AGC） is proposed. Modeling and analysis of the adaptive interference cancellation system with AGC are made. The convergence time, interference cancellation ratio （ICR） and desired signal cancellation ratio （SCR） are analyzed. The influence of zero drift on system performance is also analyzed. It is found that the AICS with AGC could effectively suppress the influence of zero drift by proper gain assignment. Furthermore, a higher ICR and a faster convergence speed could be obtained even though the interference signal power is low. The experimental results are in agreement with the theoretical analysis and demonstrate the effectiveness of the AGC, which is of great value to improving the performance of the AICS.