Compensation of IQ imbalance in OFDM systems
Compensation of IQ imbalance in OFDM systems
复制标题
OFDM 系统中 IQ 不平衡的补偿
DOI：
10.1109/icc.2003.1204086
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
M. Engels
中科院分区：
文献类型：
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作者：
J. Tubbax;B. Come;L. Perre;L. Deneire;S. Donnay;M. Engels
如今，人们将大量注意力集中在开发廉价的 OFDM 接收器上。特别是，零中频接收器非常有吸引力，因为它们避免了昂贵的中频滤波器。然而，这意味着射频处的 IQ 解调，因此不能以数字方式完成，从而引入 IQ 失配。不幸的是，OFDM 对接收器 IQ 不平衡非常敏感。因此，我们开发了一种新的补偿方案来解决基带的 IQ 不平衡问题。在本文中，我们描述了该算法并表示了性能结果。我们的补偿方案几乎完美地消除了智商失衡。这带来了巨大的改进，特别是在多径通道方面（高达 10 dB 的性能增益），并实现了低成本的零中频接收器。
Today a lot of attention is spent on developing inexpensive OFDM receivers. Especially, zero-IF receivers are very appealing, because they avoid costly IF filters. However, this implies IQ demodulation at RF, which therefore cannot be done digitally and thus introduces IQ mismatch. Unfortunately, OFDM is very sensitive to receiver IQ imbalance. Therefore, we developed a new compensation scheme to combat the IQ imbalance at baseband. In this paper, we describe the algorithm and represent the performance results. Our compensation scheme eliminates the IQ imbalance almost perfect. This leads to tremendous improvements, especially in multi-path channels (up to 10 dB performance gain), and enables low-cost zero-IF receivers.