Digital baseband compensation of joint TX/RX frequency-dependent I/Q imbalance in mobile MIMO-OFDM transceivers

2009 43rd Annual Conference on Information Sciences and Systems Pub Date : 2009-03-18 DOI:10.1109/CISS.2009.5054780

B. Narasimhan, S. Narayanan, N. Al-Dhahir, H. Minn

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引用次数: 5

Abstract

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 Inter-Carrier 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.

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

直接转换正交频分复用(OFDM)系统存在发射和接收模拟处理缺陷，如同相/正交(I/Q)不平衡导致子载波之间的载波间干扰(ICI)。在OFDM系统中，性能受限的另一个来源是由于移动性引起的多普勒频散，但性质不同。与之前单独考虑这两个问题的工作不同，我们开发了一个广义的分析框架来表征、估计和共同减轻由于I/Q不平衡和高流动性而导致的ICI。在一般模型的基础上，利用特殊的ICI结构设计了高迁移率条件下联合收发频率无关和频率相关I/Q不平衡的有效信道和I/Q不平衡参数估计和数字基带补偿方案。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)情况，特别是空间复用(SM)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2009 43rd Annual Conference on Information Sciences and Systems

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