基于信道相位偏移因子的OFDM通信峰均比抑制技术  

OFDM Communication Peak-to-Average Ratio Suppression Technology Based on Channel Phase Offset Factor

作　　者：黄可钦 王轲 赵德龙 宋章启 邵理阳 HUANG Keqin;WANG Ke;ZHAO Delong;SONG Zhangqi;SHAO Liyang(Southern University of Science and Technology,Shenzhen Guangdong 518000,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou Guangdong 511458,China)

机构地区：[1]南方科技大学,广东深圳518000 [2]南方海洋科学与工程广东省实验室(广州),广东广州511458

出　　处：《通信技术》2023年第3期269-275,共7页Communications Technology

基　　金：深圳市科技计划基础研究项目(JCYJ20190809154209372);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0210)。

摘　　要：通信中的正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术具有频带利用率高、抗多径衰落强等优点,但是OFDM通信存在高峰值平均功率比(Peak to Average Power Ratio,PAPR)的问题,如果不加抑制,在输出时会导致信号失真,降低通信效率。提出了一种通过给OFDM符号不同信道的导频和信号添加固定相位偏移因子来抑制发射信号PAPR的方法。首先介绍了信道相位偏移因子的添加方法和解调过程,其次仿真分析表明随机产生的相位偏移因子可以将任意传输信号的PAPR抑制在小于11 dB的水平。此技术不需要消耗额外带宽和计算资源,且对系统的误码率几乎没有影响。最后采样低成本的功放和声源作为发射换能器,用光纤水听器作为接收换能器进行实际通信试验,验证了该方法的有效性。The OFDM(Orthogonal Frequency Division Multiplexing)technology in communication has the advantages of high frequency band utilization and strong resistance to multipath fading.However,OFDM communication has a high PAPR(Peak-to-Average Power Ratio)problem,and if this is not suppressed,it will cause signal distortion at the output and reduce communication efficiency.This paper proposes a suppression method to suppress the PAPR of the transmitted signal by adding a fixed phase offset factor to the pilots and signals of different channels of the OFDM symbol.First,the paper introduces the method of adding the channel phase offset factor and the demodulation process.Then,the simulation analysis indicates that the randomly generated phase offset factor can suppress the PAPR of any transmitted signal to a level of less than 11dB.This method does not consume extra bandwidth and computational resources and has almost no impact on the BER(Bit Error Rate)of the system.Finally,it samples low-cost amplifiers and sound sources as transmitting transducers and conducts practical communication experiment with fiber-optic hydrophones as receiving transducers to verify the effectiveness of the method.

关 键 词：OFDM 峰均比 信道相位偏移因子 光纤水听器 

分 类 号：TB567[交通运输工程—水声工程]