降低OTFS信号PAPR的无边信息传输SLM方法  

A PAPR Reduction SLM Method for OTFS Signals without Transmitting Side Information

作　　者：许晨 王浩[1] 邵思宇 任光亮[1] XU Chen;WANG Hao;SHAO Siyu;REN Guangliang(State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学综合业务网理论及其关键技术国家重点实验室,西安710071

出　　处：《北京邮电大学学报》2025年第1期7-13,共7页Journal of Beijing University of Posts and Telecommunications

基　　金：电波环境特性及模化技术重点实验室专项资金项目(202103012)。

摘　　要：正交时频空(OTFS)调制技术在高速移动场景下具有优异的性能,但其发送信号的峰均比(PAPR)大。针对该问题,提出了一种基于选择性映射(SLM)且无需传递边信息的OTFS信号PAPR降低方法。发送端在时延多普勒域通过随机相位序列对发送符号进行加扰,并利用OTFS独有的脉冲导频位置的自由度来隐藏边信息。接收端在时延多普勒域通过检测接收符号能量分布的差异来提取边信息,最后重新推导了时延多普勒域的输入输出关系,给出了改进后的信道估计和信号检测算法。仿真结果表明,所提方法可以有效降低峰值平均功率比约2.4 dB,同时在采用估计信道状态信息的情况下仅有0.4 dB的误码率性能损失。Orthogonal time frequency space(OTFS)modulation has an excellent performance in high-speed mobile scenarios.However,OTFS modulation is susceptible to the problem of high peak-to-average power ratio(PAPR).Regarding this issue,a selective mapping(SLM)method without transmitting side information is proposed to reduce the PAPR of OTFS signals.The random phase sequences are employed to scramble the transmitted symbols in the delay-Doppler(DD)domain,and the unique degree of freedom of OTFS pulse pilot positions are used to carry the side information,which can be extracted by detecting the differences in the energy distribution of received symbols in the DD domain.Finally,the input-output relationship in the DD domain was derived again,and an improved channel estimation and signal detection algorithm was provided.Simulation results show that the proposed method can effectively reduce the PAPR by about 2.4 dB,and the performance loss of bit error rate is only 0.4 dB with the estimated channel state information.

关 键 词：正交时频空调制 峰值平均功率比 选择性映射 边信息 

分 类 号：TN929.5[电子电信—通信与信息系统]