一种降低可见光通信系统PAPR的P-OFDM方法  

P-OFDM methods for reducing PAPR in visible light communication

作　　者：赵瑶 王翀 高伟 张进玉 王姣 

机构地区：[1]西安邮电大学电子工程学院,西安710121

出　　处：《光通信技术》2018年第3期5-8,共4页Optical Communication Technology

基　　金：国家自然科学基金(11604262)资助

摘　　要：针对可见光通信系统中高峰均比(PAPR)问题,提出了一种极性光正交频分复用(P-OFDM)方法。发送端采用极坐标转换思想,将通过快速傅里叶逆变换(IFFT)变换器得到的时域复信号的实部和虚部,转换成极坐标下的幅值和相位,经过压缩变换后同时在信道中进行传输,以满足可见光通信传输信号为实正的要求;接收端接收到的信号通过扩展变换进行反压缩,经逆极坐标转换和快速傅里叶变换(FFT)恢复出原始信号。仿真结果表明P-OFDM系统不仅能有效地降低系统的峰均比,而且频谱利用率和误码性能也得到了改善,系统整体性能得到有效提升。In the visible light communication system, a new orthogonal of polar orthogonal frequency division multiplexing （P-OFDM） method is proposed for the peak-to-average ratio （PAPR） problem. At the sending side, the idea of polar transmition, the real part and the imaginary part of the complex signal in the time do- main obtained by the IFFT converter are converted into the amplitude and the phase under polar coordinates. After compressed conversion, amplitude and phase are transmitted simultaneously in the channel to meet the requirement that signals are both real and unipolar in visible light communication. At the receiver side, the re- ceived signals are decompressed by the extended transform, and the original signal are restored by the reverse polar transform and FFT transform. Through simulatting, the results show that the P-OFDM system can not only effectively reduce the PAPR of the system, but also improve the spectrum efficiency and bit error rate performance. The overall performance of the system is effectively enhanced.

关 键 词：可见光通信 P-OFDM 极性正交频分复用 峰均比 压扩变换 

分 类 号：TN929.1[电子电信—通信与信息系统]