高阶调制下物理层网络编码与OFDM联合设计  

Joint Design of Physical-Layer Network Coding and OFDM under High-Order Modulation

作　　者：李佳其 唐猛[1] 王昊 陈建华[1] LI Jia-qi;TANG Meng;WANG Hao;CHEN Jian-hua(School of Information Science and Engineering,Yunnan University,Kunming Yunnan 650500,China)

机构地区：[1]云南大学信息学院,云南昆明650500

出　　处：《计算机仿真》2024年第4期193-198,共6页Computer Simulation

基　　金：国家自然科学基金(61861045);云南省智慧城市网络空间安全重点实验室开放课题(202105AG070010-BM-06)。

摘　　要：物理层网络编码(Physical-layer Network Coding,PNC)因其可以在中继通信中大幅提高吞吐量而备受关注。为了进一步提高传输效率,减少多径的影响,在三节点双向无线PNC系统中引入16QAM-OFDM高阶调制技术,设计了16QAMOFDM-PNC通信系统。由于采用16QAM-OFDM高阶调制的PNC系统存在中继映射模糊的问题,对16QAM信号的星座点重新布局,设计出相应的中继解调映射规则。为了进一步提高系统性能,在该设计中引入低密度奇偶校验码(Low Density Parity Check Code,LDPC),设计了相应的译码映射算法。最后实验表明,上述设计相较于16QAM-PNC系统具有更好的系统性能,同时联合LDPC编码的设计能提高系统增益约2dB。Physical-layer network coding(PNC)has attracted much attention due to its ability to significantly improve throughput in relay communication.In order to further improve the transmission efficiency and reduce the impact of multipath,this paper introduced 16QAM-OFDM high-order modulation technology in three-node bidirectional wireless PNC system to design the communication system of 16QAM-OFDM-PNC.Due to the problem of ambiguity of relay mapping in the PNC system using 16QAM-OFDM high-order modulation,this paper rearranged the constellation points of the 16QAM signal,designed the corresponding relay demodulation mapping rules,and by analyzing the performance of the OFDM-PNCsystem with 16QAM signal of different constellation point layouts,the best 16QAM scheme of them was obtained.In order to further improve the system performance,low density parity check code(LDPC)was introduced into the design,and the corresponding decoding mapping algorithm was designed.Finally,the experiments show that the design has better system performance than 16QAM-PNC system,and the design of combined LDPC coding can improve the system performance by about 2dB.

关 键 词：物理层网络编码 正交频分复用 正交幅度调制信号 低密度奇偶校验码 

分 类 号：TN925[电子电信—通信与信息系统]