Two-Dimensional Cartesian Memory Polynomial Model for Nonlinearity and I/Q Imperfection Compensation in Concurrent Dual-Band Transmitters
Two-Dimensional Cartesian Memory Polynomial Model for Nonlinearity and I/Q Imperfection Compensation in Concurrent Dual-Band Transmitters
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DOI：
10.1109/tcsii.2015.2482678
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
S. Lajnef;N. Boulejfen;A. Abdelhafiz;F. Ghannouchi
中科院分区：
文献类型：
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作者：
S. Lajnef;N. Boulejfen;A. Abdelhafiz;F. Ghannouchi
对高数据速率和宽带无线接入的需求使得开发使用多频带信号的无线电系统成为必要。随着这些系统的部署，所使用的射频前端和功率放大器（PA）表现出许多非线性效应，导致信号失真。使用线性化技术是必要的，以提高线性效率的权衡。本简报探讨了适用于双频段信号驱动时遭受硬件缺陷的发射机建模和线性化的新方案。提出了一种增强的、精确的2-D笛卡尔记忆多项式模型（2DECMPM），用于补偿非线性失真以及同相和正交相位（I-Q）不平衡和直流偏移等硬件损伤。从准确性的角度来看，所提出的模型提供了更好的补偿性能，这主要是由于与2-D联合记忆多项式模型（2DJMPM）相比，在I和Q信号之间使用了额外的交叉项。实验结果表明，提出的基于2DECMPM的预失真器实现了上级PA线性化和I-Q不平衡补偿，具有与最先进的2DJMPM模型相当的复杂性。
The demand for high data rates and broadband wireless access necessitates the development of radio systems that use multiband signals. With the deployment of these systems, the radio-frequency front ends and power amplifiers (PAs) used exhibit many nonlinear effects leading to signal distortions. The use of a linearization technique is necessary to enhance the linearity-efficiency tradeoff. This brief explores new schemes suitable for the modeling and linearization of transmitters suffering from hardware imperfections when driven with dual-band signals. An enhanced and accurate 2-D Cartesian memory polynomial model (2DECMPM) is proposed to compensate for hardware impairments such as the in-phase and quadrature-phase (I-Q) imbalance and dc offset in addition to nonlinear distortion. From an accuracy perspective, the proposed model offers better compensation performance, mainly due to the use of additional cross-terms between I and Q signals compared to the 2-D joint memory polynomial model (2DJMPM). Experimental results show that the proposed 2DECMPM-based predistorter enabled superior PA linearization and I-Q imbalance compensation with a comparable complexity with the state-of-the-art 2DJMPM model.