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首页> 外文会议>Information Sciences and Systems, 2009. CISS 2009 >Digital baseband compensation of joint TX/RX frequency-dependent I/Q imbalance in mobile MIMO-OFDM transceivers
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Digital baseband compensation of joint TX/RX frequency-dependent I/Q imbalance in mobile MIMO-OFDM transceivers

机译：移动MIMO-OFDM收发器中联合的TX / RX频率相关I / Q不平衡的数字基带补偿

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摘要

Direct-conversion orthogonal frequency division multiplexing (OFDM) systems suffer from transmit and receive analog processing impairments such as in-phase/ quadrature (I/Q) imbalance causing intercarrier interference (ICI) between the sub-carriers. Another source of performance-limiting ICI, but with a different nature, in OFDM systems is Doppler spread due to mobility. Unlike previous work which considered these two problems separately, we develop a generalized analytical framework to characterize, estimate and jointly mitigate ICI due to both I/Q imbalance and high mobility. Based on our general model, we exploit the special ICI structure to design efficient channel and I/Q imbalance parameter estimation and digital baseband compensation schemes for joint transmit/receive frequency-independent and frequency-dependent I/Q imbalance under high-mobility conditions. Moreover, we extend the model, compensation and channel estimation methods to the multiple input multiple output (MIMO) case, spatial multiplexing (SM) in particular.
机译：直接转换正交频分复用（OFDM）系统遭受发射和接收模拟处理的损害，例如同相/正交（I / Q）不平衡，从而导致子载波之间的载波间干扰（ICI）。在OFDM系统中，性能受限的ICI的另一个来源却具有不同的性质，这是由于移动性引起的多普勒扩展。与以前的工作分别考虑这两个问题不同，我们开发了一个通用的分析框架来表征，估计和共同缓解由于I / Q不平衡和高移动性而导致的ICI。基于我们的通用模型，我们利用特殊的ICI结构来设计高效的信道和I / Q不平衡参数估计以及数字基带补偿方案，以在高移动性条件下联合发送/接收频率独立和频率依赖的I / Q不平衡。此外，我们将模型，补偿和信道估计方法扩展到多输入多输出（MIMO）的情况，尤其是空间复用（SM）。

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