Factors Affecting Spectral Regrowth in DS-CDMA Signals Due to PD-HPA Nonlinear Distortion
Factors Affecting Spectral Regrowth in DS-CDMA Signals Due to PD-HPA Nonlinear Distortion
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DOI：
10.1109/vetecf.2010.5594446
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
T. Helaly;R. Dansereau;M. El-Tanany
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文献类型：
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作者：
T. Helaly;R. Dansereau;M. El-Tanany
当通过高功率放大器 (HPA) 时，下行链路直接序列码分多址 (DS-CDMA) 信号会导致额外的带外发射或频谱再生，这可能会影响相邻信道。在本文中，我们探讨了与放大器特性相关的输入 CDMA 信号的哪些特性有助于频谱再生。这些特性代表了信号与 HPA 相互作用的关键特性，使系统设计者/操作者能够最大限度地减少传输信号中的频谱再生。本文考虑的放大器链包括一个预失真器 (PD)，即 PD-HPA。假设基带 CDMA 信号的特征是带限高斯过程，我们开发了有助于频谱再生的特征的解析表达式。最后，仿真实验证明了已建立的信号特性对光谱再生的影响。
When passed through a high power amplifier (HPA), downlink direct sequence-code division multiple access (DS- CDMA) signals result in additional out-of-band emissions, or spectral regrowth, which could affect adjacent channels. In this paper, we explore which characteristics of the input CDMA signal, in relation to the amplifier characteristics, contribute to spectral regrowth. These characteristics represent the key features of the signal's interplay with the HPA, which give the system designer/operator the ability to minimize the spectral regrowth in the transmitted signal. The amplifier chain considered in this paper includes a predistorter (PD), namely PD- HPA. Assuming that the baseband CDMA signal is characterized as a band-limited Gaussian process, we develop analytic expressions for the characteristics contributing to spectral regrowth. Finally, simulation experiments are presented to demonstrate the effect of the established signal characteristics on spectral regrowth.