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A New Scheme to Mitigate the OFDM High PAR Problem by Minimizing the Signal's Nonlinear Distortion Caused by HPA

机译:通过最小化HPA引起的信号非线性失真来缓解OFDM高PAR问题的新方案

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摘要

How to mitigate the negative impact of high PAR in OFDM systems is an important issue. Most of recent works have focused on minimizing the PAR of OFDM signal to enhance performance. However, after relating this issue with the specific characteristics of HPA, we propose a new scheme to mitigate the high PAR problem. Rather than minimizing OFDM signal's PAR, the new scheme uses the amount of OFDM signal's nonlinear distortion to be caused by HPA as a new measure and increases the performance of OFDM system by minimizing this nonlinear distortion. The pre-calculation of the new measure is achieved by employing an adaptive nonlinear system identification process. Meanwhile, because the new scheme only changes the measure of the OFDM signal but not the frameworks of the prior PAR-reduction methods based on minimum PAR criterion, these prior PAR-reduction methods can be easily extended to incorporate the new scheme. A case study of the new scheme by adopting it in the SLM method shows its superiority over the conventional scheme
机译:如何减轻高PAR在OFDM系统中的负面影响是一个重要的问题。最近的大多数工作都集中在最小化OFDM信号的PAR以提高性能上。但是,在将此问题与HPA的特定特征联系起来之后,我们提出了一种新的方案来缓解高PAR问题。新方案不是最小化OFDM信号的PAR,而是使用HPA引起的OFDM信号的非线性失真量作为新措施,并通过最小化该非线性失真来提高OFDM系统的性能。通过采用自适应非线性系统识别过程,可以实现对新措施的预先计算。同时,由于新方案仅改变了OFDM信号的度量,而没有改变基于最小PAR准则的现有PAR降低方法的框架,因此这些现有PAR降低方法可以容易地扩展以合并新方案。通过在SLM方法中采用新方案的案例研究表明,该方案优于传统方案

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