系统工程与电子技术 ›› 2019, Vol. 41 ›› Issue (4): 914-918.doi: 10.3969/j.issn.1001-506X.2019.04.30

• 通信与网络 • 上一篇    下一篇

改进的可见光通信系统SLM峰均比抑制方法

赵瑶, 王翀, 杨宏, 李国辉, 张进玉   

  1. 西安邮电大学电子工程学院, 陕西 西安 710121
  • 出版日期:2019-03-20 发布日期:2019-03-20

Improved SLM peak-to-average ratio suppression method in visible light communication

ZHAO Yao, WANG Chong, YANG Hong, LI Guohui, ZHANG Jinyu   

  1. School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
  • Online:2019-03-20 Published:2019-03-20

摘要: 针对光正交频分复用(optical orthogonal frequency division multiplexing,O-OFDM)技术系统中高峰均比和高计算复杂度的缺点,采用选择映射(selected mapping,SLM)方法,并结合离散余弦变换(discrete cosine transform,DCT)和快速傅里叶逆变换线性特性的优势,提出了一种改进的SLM峰均比抑制方案——DCT-ISLM方法。通过计算,结果表明该DCTISLM方法相较于传统SLM方法的峰均比降低了约3.5 dB;且随着备选信号个数的增加,系统的复杂度也得到了有效的改善。将该方法应用于传统的O-OFDM可见光通信系统中,误码性能也优于传统的SLM方案,可进一步提升此方法的实用价值。

Abstract:

Aiming at the disadvantages of peak-to-average ratio and high computational complexity in optical orthogonal frequency division multiplexing (O-OFDM) systems, using the idea of selected mapping (SLM) algorithm and combining the advantages of the discrete cosine transform (DCT) and the inverse fast Fourier transform linearity, an improved SLM peak-to-average ratio suppression scheme— the discrete cosine transform linear selected mapping (DCT-ISLM) method is proposed.  The simulation results shows that compared with the conventional SLM method, the proposed DCT-ISLM method reduces the peak-to-average power ratio by about 3.5 dB. With the increase of the number of candidates signals, the complexity of the system has also been effectively improved. At the same time, the scheme is applied to the traditional O-OFDM visible light communication system, and the error performance is also better than the traditional SLM scheme, thereby further enhancing the practical value of this scheme.