基于稀疏码多址接入技术的可见光通信系统性能研究  

Performance Research on Visible Light Communication SystemBased on Sparse Code Multiple Access

作　　者：黎博文 葛文萍[1,2] 赵海鹏 LI Bowen;GE Wenping;ZHAO Haipeng(School of Computer Science and Technology,Xinjiang University,Urumqi 830046,China;Key Laboratory of Signal Detection and Processing,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆大学计算机科学与技术学院,新疆乌鲁木齐830046 [2]新疆大学信号检测与处理重点实验室,新疆乌鲁木齐830046

出　　处：《无线电工程》2024年第5期1320-1327,共8页Radio Engineering

基　　金：新疆维吾尔自治区自然科学基金(2022D01C426)。

摘　　要：5G新技术应用于可见光通信(Visible Light Communication,VLC)场景对系统容量以及频谱效率有了更高的要求,稀疏码多址接入(Sparse Code Multiple Access,SCMA)技术作为一种新型的非正交多址接入(Non-Orthgonal Multiple Access,NOMA)技术可作为解决方案。针对上述方案,搭建了VLC-SCMA系统,使得系统在相同的频谱资源下能够拥有更大的系统容量和频谱效率,同时为了降低系统复杂度,加快接收端进行多用户检测时的收敛速度,提出了基于串行改进下的部分外部信息传递的消息传递算法(Message Passing Algorithm Based on Serial Strategy for Partial External Information Transmission,SPEIT-MPA)。通过在迭代过程中设置门限值过滤掉携带信息量较少的外部信息点,利用串行改进使得算法迭代过程进一步简化。在VLC-SCMA系统中的仿真结果表明,对比原始算法,新算法可以在保证误码率(Bit Error Rate,BER)性能损失较少的前提下拥有更快的收敛速度,且算法复杂度随着信噪比(Signal to Noise Ratio,SNR)的增大明显降低。The application of 5G new technology in Visible Light Communication(VLC)scenarios has higher requirements for system capacity and spectral efficiency.Sparse Code Multiple Access(SCMA)technology,as a new type of Non-Orthogonal Multiple Access(NOMA)technology,can be used as a solution.For the above scheme,the VLC-SCMA system is built,which enables the system to have greater system capacity and spectral efficiency under the same spectral resources.At the same time,in order to reduce system complexity and accelerate the convergence speed of multi user detection at the receiving end,a Message Passing Algorithm Based on Serial Strategy for Partial External Information Transmission(SPEIT-MPA)is proposed.External information points that carry less information are filtered out by setting thresholds during iteration,and serial improvements are used to further simplify the algorithm iteration process.The simulation results show that in the VLC-SCMA system,compared to the original algorithm,the new algorithm can achieve faster convergence speed while ensuring good Bit Error Rate(BER)performance and the complexity of the algorithm significantly decreases with the increase of Signal to Noise Ratio(SNR).

关 键 词：稀疏码多址接入 可见光通信系统 消息传递算法 门限值 串行改进 

分 类 号：TN929.5[电子电信—通信与信息系统]