| 摘要: |
| 针对宽带卫星收发机的频率相关I/Q不平衡（In-phase/Quadrature imbalance）问题，提出了基于归一化最小均方（Normalized Least Mean Squares，NLMS）准则和恒模均衡的I/Q不平衡补偿算法。该算法首先基于NLMS准则对接收信号进行预处理，消除I/Q不平衡导致的镜像分量，随后采用恒模均衡对接收信号进行滤波，消除残余误差的影响，从而恢复原始信号。 |
| 关键词: 宽带卫星收发机 I/Q不平衡 频率相关 归一化最小均方（NLMS）准则 恒模均衡 |
| DOI：10.20079/j.issn.1001-893x.250228003 |
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| 基金项目: |
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| A Frequency-dependent I/Q Imbalance Compensation Algorithm with Constant Modulus Equalization |
| LONG Jiawei,WANG Shuting,OU Jinglan,WU Haowei,YIN Weihua |
| (1.School of Microelectronics and Communication Engineering，Chongqing University，Chongqing 400044，China;2.Chongqing Space Rocket Electronic Technology Co.，Ltd.，Chongqing 400039，China) |
| Abstract: |
| To address the issue of frequency-dependent in-phase/quadrature(I/Q) imbalance in broadband satellite transceivers，the authors propose an I/Q imbalance compensation algorithm based on the normalized least mean squares(NLMS) criterion and constant modulus equalization.The proposed algorithm first employs NLMS-based preprocessing to mitigate the image component induced by I/Q imbalance.Subsequently，constant modulus equalization is applied to filter the received signal，thereby eliminating the impact of residual errors and recovering the original signal.Simulation results show that when the bit error rate is 10-4，compared with the NLMS joint algorithm，the proposed algorithm has a 1 dB performance improvement and is close to the ideal situation without I/Q imbalance.This method is applicable not only to scenarios involving I/Q imbalance at the receiver，but also to cases where imbalances exist at both the receiver and transmitter. |
| Key words: broadband satellite transceiver I/Q imbalance frequency-dependent normalized least mean squares（NLMS） criterion constant modulus equalization |
《电讯技术》编辑部 