Blind Frequency-Dependent I/Q Imbalance Compensation for Direct-Conversion Receivers
Blind Frequency-Dependent I/Q Imbalance Compensation for Direct-Conversion Receivers
复制标题
DOI：
10.1109/twc.2010.06.090651
复制
发表时间：
2010-06
影响因子：
10.4
通讯作者：
Yingming Tsai;Chia-Pang Yen;Xiaodong Wang
中科院分区：
文献类型：
--
作者：
Yingming Tsai;Chia-Pang Yen;Xiaodong Wang
频率相关的I/Q不平衡是高速宽带无线系统直接转换接收机（DCR）的主要缺陷之一。我们提出了两种新的盲法来补偿频率相关的I/Q不平衡。第一个是时域方法。在此基础上提出了盲I/Q不平衡补偿的代价函数和梯度下降搜索算法。第二种盲法是OFDM系统的频域盲法。在这里，我们提供了频率选择性I/Q不平衡参数的盲估计，一旦获得，I/Q不平衡可以通过简单的单抽头矩阵滤波器反演来补偿。我们提供了大量的仿真结果来证明所提出算法的性能。
Frequency-dependent I/Q imbalance is one of the major impairments in the direct-conversion receivers (DCR) for high-speed wideband wireless systems. We propose two new blind methods for compensating frequency-dependent I/Q imbalance. The first one is a time-domain approach. Specifically we develop a blind identifiability condition based on which a cost function and a gradient descent search algorithm are proposed for blind I/Q imbalance compensation. The second blind method is a frequency-domain approach for OFDM systems. Here we provide blind estimators for the frequency-selective I/Q imbalance parameters, which once obtained, the I/Q imbalance can then be compensated by a simple single-tap matrix filter inversion. We provide extensive simulation results to demonstrate the performance of the proposed algorithms.