Adaptive unsaturated technique for OFDM multimode fiber communication system
Adaptive unsaturated technique for OFDM multimode fiber communication system
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DOI：
10.1016/j.optcom.2010.05.002
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发表时间：
2010-09
影响因子：
2.4
通讯作者：
H. Guijun;Z. Lili;Li Yuan
中科院分区：
文献类型：
--
作者：
H. Guijun;Z. Lili;Li Yuan
针对正交频分复用（OFDM）多模光纤通信，提出了一种新的自适应不饱和技术。该技术的核心思想是，原本分配给较差子载波的比特现在由新的额外子载波传输，而不是自适应调制OFDM中使用的原始良好子载波。它可以降低系统误码率（BER），误码率主要是由位于多模光纤高频区深空的OFDM子载波引起的。仿真结果表明，自适应不饱和技术比自适应调制和等位分配技术更能有效地降低系统的误码率。此外，自适应不饱和技术不需要复杂的比特分配算法，而且每个子载波具有相同的调制格式，因此简单实用。
A novel adaptive unsaturated technique is proposed for Orthogonal Frequency Division Multiplexing (OFDM) multimode fiber communication. The core idea of this technique is that bits originally allocated to poor subcarriers are now transmitted by new extra subcarriers rather than the original good subcarriers used in adaptive modulation OFDM. It can reduce the system bit error rate (BER) which is mainly caused by some OFDM subcarriers located at the deep nulls in the high frequency region of multimode fiber. The simulation results indicate that adaptive unsaturated technique is more effective in reducing the BER of system than adaptive modulation and equal bit allocation. Moreover, adaptive unsaturated technique does not need complex bit allocation algorithm and each subcarrier has the same modulation format, so it is simple and practical.