OFDM双向中继系统中的功率分配优化策略  

Power Distribution Optimization Method in a OFDM Two-way Relay Systems

作　　者：沈先丽 徐友云[2] 王健[3] 徐少红 SHEN Xianli;XU Youyun;WANG Jian;XU Shaohong(CRRC Nanjing Puzhen Co.,Ltd.,Nanjing Jiangsu 210031,China;Nanjing University of Posts and Telecommunications,Nanjing Jiangsu 210003,China;National University of Defense Technology,Hefei Anhui 230037,China)

机构地区：[1]中车南京浦镇车辆有限公司,江苏南京210031 [2]南京邮电大学,江苏南京210003 [3]国防科技大学,安徽合肥230037

出　　处：《通信技术》2022年第11期1394-1402,共9页Communications Technology

基　　金：国家重点研发计划项目(2016YFE0200200)。

摘　　要：为了提高基于物理层网络编码(Physical-Layer Network Coding,PLNC)的正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)双向中继系统的误比特率(Bit Error Rate,BER)性能,结合基于子载波抑制的OFDM系统的特点,针对双向单中继场景,研究了基于联合子载波配对与子载波抑制(Joint Subcarriers Pair and Subcarriers Suppression,JSPSS)的OFDM双向中继系统的功率分配优化问题,分别提出了基于本地信道状态信息的多址接入阶段的次优功率分配策略和广播阶段的最优功率分配策略。在终端功率一定的条件下,通过优化各个终端不同子载波上加载的功率,达到减小系统误比特率的效果。仿真结果表明,提出的功率分配策略能够带来系统误比特率的性能提升,与现有的功率分配策略相比,误比特率大约能够提升1~2 dB。In order to improve the bit error rate performance of OFDM(Orthogonal Frequency Division Multiplexing) two-way relay system based on PLNC(Physical-Layer Network Coding), combined with the characteristics of OFDM system based on SS and for two-way single relay scenario, this paper investigates the power allocation optimization problem of OFDM two-way relay system based on joint subcarrier pairing and subcarrier suppression. Based on the local channel state information, this paper proposes a sub-optimal power allocation strategy in multi-access phase and an optimal power allocation strategy in broadcast phase respectively. Under certain conditions of the terminal power, the effect of reducing BER of the system is achieved by optimizing the power loaded on different subcarriers of each terminal. Simulation results indicate that the proposed power allocation strategy can bring BER performance improvement, which is about a 1 ~ 2 dB higher than the existing power allocation strategy.

关 键 词：正交频分复用 子载波抑制 网络编码 功率分配 

分 类 号：TN919.3[电子电信—通信与信息系统]