混合参数集多载波系统的峰均比抑制方法研究  

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

作　　者：石楠 刘潇然 熊俊 张晓瀛 魏急波[1] SHI Nan;LIU Xiaoran;XIONG Jun;ZHANG Xiaoying;WEI Jibo(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073

出　　处：《电信科学》2023年第10期1-14,共14页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.62101569);湖南省自然科学基金资助项目(No.2022JJ30047)。

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 mul-tiplexing,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。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 tra-ditional PAPR suppression methods straight forwardly,in which mixed signals are generated by superimposing mul-tiple sub-signals with different parameters.An optimization model for minimizing PAPR in mixed-numerology sys-tems 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 itera-tion,it had relatively low computational complexity.Simulation results show that the proposed algorithm effectively reduces the PAPR of mixed signals.

关 键 词：混合参数集 峰均比 时域核脉冲 预留子载波 

分 类 号：TN919[电子电信—通信与信息系统]