面向通感一体OFDM系统峰均比抑制的研究  

Research onpeak-to-average power ratio reduction in sensing-integrated OFDM systems

作　　者：鲜永菊[1] 赵润昊 邢智童 李云[1,2] XIAN Yongju;ZHAO Runhao;XING Zhitong;LI Yun(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;School of Software Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]重庆邮电大学软件工程学院,重庆400065

出　　处：《西安电子科技大学学报》2024年第6期40-51,共12页Journal of Xidian University

基　　金：国家自然科学基金(62301100,62071077);重庆市教委科学技术研究计划青年项目(KJQN2200606);重庆市自然科学基金面上项目(CSTB2024NSCQ-MSX0210)。

摘　　要：正交频分复用信号作为未来通感一体化信号的备用波形受到广泛关注。然而正交频分复用信号因其峰值平均功率比较高,在经过高功率放大器后不仅导致通信性能的降低还会造成感知性能不理想。文中提出一种基于改变信号幅度概率密度函数的压扩变换,旨在对正交频分复用一体化信号峰均比抑制的同时,还能保持优良的通信性能和感知性能。仿真分析表明,在大致相同峰均比前提下,在64阶正交振幅调制下,含有所提压扩算法的通感一体化系统在经过固态功率放大器以及加性高斯白噪声信道后,通信误码率为10-5时所需的信噪比对比其他算法分别低0.10、0.29、0.69和1.10 dB。在感知性能方面,含有所提压扩算法的通感一体化系统,其测速均方根误差和测距均方根误差均优于不含压扩算法的正交频分复用通感一体化系统。Orthogonal Frequency Division Multiplexing as an alternative waveform for future Integrated Sensing and Communication signals is widely studied.However,the issue of high peak-to-average power ratio in orthogonal frequency division multiplexing signals not only leads to a decrease in communication performance after passing through high-power amplifiers,but also results in suboptimal sensing performance.In this paper,a companding transform is proposed to alter the probability density distribution of signal amplitudes,aiming to reduce the PAPR of integrated OFDM signals while maintaining excellent communication and sensing performance.Simulation analysis shows that,under roughly the same peak-to-average power ratio conditions,in 64-QAM modulation,the communication bit error rate of the integrated communication and perception system containing the proposed peak-to-average power ratio reduction algorithm in this paper is respectively 0.1 dB,0.29 dB,0.69 dB,and 1.1dB lower than other algorithms after passing through a solid-state power amplifier and an additive white Gaussian noise channel when the BER is 10-5.In terms of sensing performance,the root mean square error(RMSE)of both velocity estimation and range estimation for the integrated communication and sensing system incorporating the proposed companding algorithm in this paper is superior to that of the OFDM integrated communication and sensing system without the companding algorithm.

关 键 词：正交频分复用 通感一体化 峰值平均功率比 压扩变换 

分 类 号：TN929.53[电子电信—通信与信息系统]