红外与激光工程, 2018, 47 (10): 1022003, 网络出版: 2018-11-25  

FSO-WOFDM系统的实验研究

Experimental study on FSO-WOFDM system
作者单位
西安理工大学 自动化与信息工程学院, 陕西 西安 710048
摘要
在无线光正交频分复用(FSO-OFDM)系统中, 因需要加入循环前缀而消耗近20%的带宽, 降低了数据传输效率。为了进一步减少带宽损耗, 改善系统性能, 采用小波包变换代替FSO-OFDM中的傅里叶变换, 设计了一种基于小波变换的无线光正交频分复用(FSO-WOFDM)系统。该系统无需加入循环前缀, 利用小波基函数的正交性来抑制子载波间的干扰。根据FSO-WOFDM系统原理, 研究了信道估计方法、湍流强度、小波基对FSO-WOFDM系统误码率的影响, 对比分析了FSO-WOFDM与FSO-OFDM的系统性能, 并通过实验验证了FSO-WOFDM系统的可行性及其优良的抗混合噪声干扰能力。
Abstract
In the free space optical orthogonal frequency division multiplexing(FSO-OFDM) system, nearly 20% of the bandwidth is consumed due to add a cyclic prefix, the data transmission efficiency is reduced. In order to further reduce the bandwidth loss and improve the system performance, a wavelet packet transform was used instead of the Fourier transform in FSO-OFDM, free space optical orthogonal frequency division multiplexing system based on wavelet transform(FSO-WOFDM) was designed. The system didn′t need to add a cyclic prefix, and the orthogonality of the wavelet basis functions was used to suppress inter-carrier interference. According to the principle of FSO-WOFDM system, the effects of channel estimation method, turbulence intensity and wavelet based on the bit error rate of FSO-WOFDM system were studied. The system performance of FSO-WOFDM and FSO-OFDM was compared and analyzed. The experiment verifies the feasibility of FSO-WOFDM system and its excellent ability to resist mixed noise.

柯熙政, 张棋雯. FSO-WOFDM系统的实验研究[J]. 红外与激光工程, 2018, 47(10): 1022003. Ke Xizheng, Zhang Qiwen. Experimental study on FSO-WOFDM system[J]. Infrared and Laser Engineering, 2018, 47(10): 1022003.

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