电检修无功电压线的光纤系统研究

Research on Optical Fiber System of Reactive Power Line

文中基于电检修无功电压线的光纤系统,采用自适应的OFDM的系统,设计了chow自适应算法和OSNR门限分配算法的子带自适应调制技术,进而解决正交频分复用(OFDM)不能克服深衰落点对系统性能产生的影响的问题。多模光纤通信系统应用实验表明:根据子载波信道的特性,自适应算法可以合理的选择调制方式:在信道特性较差时使用低阶调制少传输甚至不传输信息,在信道特性较好时提高调制阶数多传输信息,有效地实现了自适应调制选择;当系统误码率相同时,通信系统在使用自适应技术的情况下比不使用的情况下对OSNR的要求大约低2dB。

In order to solve the orthogonal frequency division multiplexing(OFDM) cannot overcome deep fading influence on the performance of the system problem, this paper adopts adaptive OFDM system, designed the chow adaptive algorithm and the distribution of OSNR threshold algorithm of subband adaptive modulation technology. Multimode optical fiber communication system application results show that: according to the characteristics of subcarrier channel, the adaptive algorithm can choose reasonable method of modulation: poor in channel characteristic using low-order modulation transmission does not even less when the transmission information, the channel characteristic is better transmit information, improves the modulation order more effectively to realize the adaptive modulation choice;when the system error vate is same, the communication system is lower about 2 dB in the case of using adaptive technology than that under the condition of using the rightness of the OSNR.