可见光通信中的OFDM技术的改进与仿真  

Improvement and simulation of OFDM technology in visible light communication

作　　者：鲍晶晶[1] 董华锋[2] 

机构地区：[1]东莞职业技术学院,广东东莞523808 [2]广东工业大学,广东广州510006

出　　处：《现代电子技术》2017年第16期32-34,共3页Modern Electronics Technique

基　　金：国家自然科学基金(11604056);东莞职业技术学院政校行企合作开展科研与服务项目(政201610);广东省高等职业教育品牌专业建设项目(520901)

摘　　要：传统无需增加直流的可见光通信OFDM技术(PAM-DMT),对子载波的利用率较低,受噪声干扰大。提出融合PAM-DMT以及DCO-OFDM信号的PDO-OFDM调制解调方法并对其进行改进,在PAM-DMT系统中融入DCO-OFDM信号,充分利用子载波资源,提升通信速率。对PDO-OFDM中三项参数进行合理设置,提高系统解码性能。通过频域分集合并方法改进系统的接收端,依据傅里叶变换的线性特征,直接在频域中进行减法运算,获取纯净的PAM-DMT信号在子载波实部中的数值,采用PAM-DMT改进接收端完成解调,增强系统的解码性能。仿真结果表明,所提方法优化了可见光通信的误码率,显著提升了系统的调整性能。The traditional visible light communication OFDM （orthogonal frequency division multiplexing） technology （PAM -DMT） which does not need to add DC has low utilization ratio of subcarriers and is greatly affected by noise interference. The PDO-OFDM modulation-demodulation method fusing PAM-DMT and DCO-OFDM signals is proposed and improved. The DCO- OFDM signal is fused into the PAM-DMT system to improve the communication rate by making full use of the subcarrier resources. The three parameters of PDO-OFDM are rationally set up to improve the decoding performance of the system. The receiving end of the system is improved with frequency diversity combining method. The subtraction operation is performed directly in the frequency domain according to the linear features of Fourier transform to obtain the numerical value of pure PAM-DMT signal in subcarrier real part. The PAM-DMT is used to modify the receiver for demodulation and enhance the decoding performance of the system. The simulation results show that the proposed method can improve the adjustment performance of the system obviously by optimizing the bit error rate of the visible communication.

关 键 词：可见光通信 OFDM技术 技术改进 调制解调 

分 类 号：TN925.93[电子电信—通信与信息系统] TN91[电子电信—信息与通信工程]