A peak-to-average power ratio reduction method for mixed-numerology multi-carrier systems

Nan SHI; Xiaoran LIU; Jun XIONG; Xiaoying ZHANG; Jibo WEI

doi:10.11959/j.issn.1000-0801.2023194

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A peak-to-average power ratio reduction method for mixed-numerology multi-carrier systems

Research and Development | 更新时间：2024-06-05

- A peak-to-average power ratio reduction method for mixed-numerology multi-carrier systems
- Telecommunications Science Vol. 39, Issue 10, Pages: 1-14(2023)
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- DOI：10.11959/j.issn.1000-0801.2023194
  CLC： TN919
- Published Online：2023-10，
  
  Published：20 October 2023
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Nan SHI, Xiaoran LIU, Jun XIONG, et al. A peak-to-average power ratio reduction method for mixed-numerology multi-carrier systems[J]. Telecommunications science, 2023, 39(10): 1-14.
DOI：

Nan SHI, Xiaoran LIU, Jun XIONG, et al. A peak-to-average power ratio reduction method for mixed-numerology multi-carrier systems[J]. Telecommunications science, 2023, 39(10): 1-14. DOI： 10.11959/j.issn.1000-0801.2023194.

摘要

为了满足多样化场景下的通信需求，5G采用了以正交频分复用（orthogonal frequency division multiplexing，OFDM）技术为基础的混合参数集系统。该系统将具有不同子载波间隔和循环前缀长度的OFDM符号在频域进行复用，同时服务不同场景下的用户。混合参数集系统中峰均比（peak-to-average power ratio，PAPR）过高的问题仍然存在，并且不同参数子信号叠加生成混合信号这一设计结构使得传统OFDM的PAPR抑制方法难以直接应用。基于预留子载波技术建立了混合参数集系统最小化 PAPR 的优化模型。利用时域核脉冲的单峰特性，根据混合信号的峰值位置同时在不同参数集中产生多个副本，之后叠加生成混合时域核脉冲进行峰值抵消。所提算法不需要在迭代中进行快速傅里叶逆变换（inverse fast Fourier transform，IFFT）/快速傅里叶变换（fast Fourier transform，FFT）操作，具有较低的计算复杂度。仿真结果表明，该算法有效降低了混合信号的PAPR。

Abstract

In order to support diverse service demands of communication scenarios

5G adopts the mixed-numerology system based on orthogonal frequency division multiplexing (OFDM).The mixed-numerology systems still have the problem of high peak-to-average power ratio (PAPR).Furthermore

its design structure makes it difficult to apply traditional PAPR suppression methods straight forwardly

in which mixed signals are generated by superimposing multiple sub-signals with different parameters.An optimization model for minimizing PAPR in mixed-numerology systems was established based on tone reservation method.Utilizing the characteristic of single-peak of time-domain kernel

the multiple copies were generated in different numerologies based on the peak position of the mixed signal.The mixed time-domain kernel was then superimposed to reduce the peaks of the mixed signal.Since the proposed algorithm didn’t require inverse fast Fourier transform (IFFT)/ fast Fourier transform (FFT) operations during iteration

it had relatively low computational complexity.Simulation results show that the proposed algorithm effectively reduces the PAPR of mixed signals.

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