Peak-to-Average Power Ratio Analysis for OFDM-Based Mixed-Numerology Transmissions
Peak-to-Average Power Ratio Analysis for OFDM-Based Mixed-Numerology Transmissions
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DOI：
10.1109/tvt.2019.2960801
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发表时间：
2020-02-01
影响因子：
6.8
通讯作者：
Wei, Jibo
中科院分区：
文献类型：
--
作者：
Liu, Xiaoran;Zhang, Lei;Wei, Jibo
分析了基于正交频分复用的混合数字传输系统的峰值平均功率比的概率分布。最新技术的理论分析隐含地假设了ofdm信号的连续和对称频谱。因此，由于其复杂性，很难将其应用于混合数字系统。通过综合考虑各个子带的信号形态、带宽和功率电平等系统参数，提出了基于电平交叉理论的连续时间信号PAPR的一般解析分布函数。该方法既适用于传统的单一命理系统，也适用于混合命理系统。此外，它还保证了非连续-ofdm(NC-ofdm)的有效性。给出了得到的分布表达式，进一步研究了不同数字之间的功率分配对PAPR的影响。仿真结果表明，该方法与理论计算结果吻合较好。
In this paper, the probability distribution of the peak to average power ratio (PAPR) is analyzed for the mixed numerologies transmission based on orthogonal frequency division multiplexing (OFDM). State of the art theoretical analysis implicitly assumes continuous and symmetric frequency spectrum of OFDM signals. Thus, it is difficult to be applied to the mixed-numerology system due to its complication. By comprehensively considering system parameters, including numerology, bandwidth and power level of each subband, we propose a generic analytical distribution function of PAPR for continuous-time signals based on level-crossing theory. The proposed approach can be applied to both conventional single numerology and mixed-numerology systems. In addition, it also ensures the validity for the noncontinuous-OFDM (NC-OFDM). Given the derived distribution expression, we further investigate the effect of power allocation between different numerologies on PAPR. Simulations are presented and show the good match of the proposed theoretical results.