Performance evaluation of non-ideal RF transmitter in LTE/LTE-Advanced systems

2009 European Wireless Conference Pub Date : 2009-05-17 DOI:10.1109/EW.2009.5358002

C. Galiotto, Yonghui Huang, N. Marchetti, M. Zorzi

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引用次数: 9

Abstract

The Long Term Evolution (LTE) and LTE-Advanced (LTE-A) standards are under development for the next generation mobile communication systems. High peak data rates and high spectral efficiency are some of the requirements of these standards, which should also include Flexible Spectrum Usage (FSU) techniques for an efficient use of the limited available bandwidth (BW). Considering Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) as a possible FSU proposal for LTE/LTE-Advanced, in this paper an analysis of the effects of the RF imperfections —such as IQ imbalance, phase noise and non-linear power amplifier— on the downlink transmission in LTE/LTE-Advanced is presented. Two different aspects are pointed out. First, concerning NC-OFDM, it is shown that the RF transmitter causes an increase of the Power Spectral Density (PSD) in the subchannels not used for transmission, which means interference with the other systems using those subchannels. Second, concerning the high data rates and high spectral efficiency, it turns out that the 64-QAM rate 3/4, used to reach these requirements, is deeply affected by the RF transmitter imperfections.

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LTE/LTE- advanced系统中非理想射频发射机的性能评估

下一代移动通信系统的长期演进(LTE)和LTE- advanced (LTE- a)标准正在开发中。高峰值数据速率和高频谱效率是这些标准的一些要求，还应包括灵活频谱使用(FSU)技术，以有效利用有限的可用带宽(BW)。本文将非连续正交频分复用(NC-OFDM)作为LTE/LTE- advanced的一种可能的FSU方案，分析了IQ不平衡、相位噪声和非线性功率放大器等射频缺陷对LTE/LTE- advanced下行传输的影响。他们指出了两个不同的方面。首先，关于NC-OFDM，研究表明射频发射机会导致未用于传输的子信道中的功率谱密度(PSD)的增加，这意味着对使用这些子信道的其他系统的干扰。其次，关于高数据速率和高频谱效率，事实证明，用于达到这些要求的64-QAM速率3/4深受射频发射机缺陷的影响。

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 European Wireless Conference

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