Dispersion-Tolerant DDO-OFDM System and Simplified Adaptive Modulation Scheme Using CAZAC Precoding
Dispersion-Tolerant DDO-OFDM System and Simplified Adaptive Modulation Scheme Using CAZAC Precoding
复制标题
色散容忍 DDO-OFDM 系统和使用 CAZAC 预编码的简化自适应调制方案
DOI：
10.1109/jlt.2016.2547443
复制
发表时间：
2016-06
影响因子：
4.7
通讯作者：
Deming Liu
中科院分区：
文献类型：
--
作者：
Lei Deng;Songnian Fu;Perry Ping Shum;Deming Liu
将与信号和信道无关的恒幅零自相关序列（CAZAC）预编码技术应用于带宽受限的长距离DDO-OFDM系统，并根据CAZAC预编码后的均衡子载波信噪比，提出了一种简化的自适应调制方案。仿真结果表明，在给定的接收光功率下，传统的8.23 Gb/s双边带（DSB）调制QPSK OFDM信号无法实现100 km标准单模光纤（SSMF）传输，而CAZAC预编码可以实现100 km SSMF传输，色散诱导功率代价低至2.7 dB。将CAZAC预编码应用于16.46-Gb/s16 QAM-OFDM系统，其优势更加明显。由于频率分集，采用CAZAC的OFDM系统被证明具有更好的色散容忍能力，提高了接收机的灵敏度。我们还分析了每个单独的子载波的信噪比（SNR）和其平坦度被证实是独立的调制格式和传输距离时，使用预编码大大改善。基于平坦信噪比曲线的先验知识，我们进一步提出了一种简化的自适应调制方案，该方案仅使用三个步骤，可以应用比特加载而省略功率加载。仿真和实验结果表明，在不增加系统复杂度的情况下，简化的自适应调制方法可以进一步改善系统的误码性能。
We apply the signal- and channel-independent constant amplitude zero autocorrelation sequence (CAZAC) precoding technique to a bandwidth-limited longer-reach DDO-OFDM system, and propose a simplified adaptive modulation scheme according to the equalized SNR per subcarrier after CAZAC precoding. Simulation results show that with the optimized modulation index, conventional 8.23-Gb/s double sideband (DSB) modulated QPSK-OFDM signal cannot realize 100 km standard single-mode fiber (SSMF) transmission at the given received optical power, while CAZAC precoding can enable 100 km SSMF transmission with dispersion-induced power penalty as low as 2.7 dB. The advantage becomes more obvious when CAZAC precoding is employed to 16.46-Gb/s 16QAM-OFDM systems. Thanks to the frequency diversity, OFDM system with CAZAC is proved to be more dispersion tolerant with improved receiver sensitivity. We also analyze the signal-to-noise ratio (SNR) of each individual subcarrier and its flatness is confirmed to be much improved independent of modulation formats and transmission distances when precoding is used. Based on the priori knowledge of flat SNR curve, we further propose a simplified adaptive modulation scheme using only three steps where bit loading can be applied with power loading omitted. Simulation and experimental results demonstrate that the BER performance can be further improved with negligible data rate reduction and system complexity aggravation using our proposed simplified adaptive modulation method.
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DOI：
10.1364/cleo_at.2015.jth2a.61
发表时间：
2015-05
期刊：
2015 Conference on Lasers and Electro-Optics (CLEO)
影响因子：
--
作者：
Zhenhua Feng;M. Tang;Rui Lin;Ruoxu Wang;Qiong Wu;Liangjun Zhang;Liangliang Xu;Xiaolong Wang;Cong Zhou;Jiadi Wu;Shiwei Zhou;L. Deng;S. Fu;Deming Liu;P. Shum
通讯作者：
Zhenhua Feng;M. Tang;Rui Lin;Ruoxu Wang;Qiong Wu;Liangjun Zhang;Liangliang Xu;Xiaolong Wang;Cong Zhou;Jiadi Wu;Shiwei Zhou;L. Deng;S. Fu;Deming Liu;P. Shum
采用预加重技术的直接检测光 OFDM 传输系统
影响因子：
4.7
作者：
Gao, Yang;Yu, Jianjun;Xiao, Jiangnan;Cao, Zizheng;Li, Fan;Chen, Lin
通讯作者：
Chen, Lin
影响因子：
11.2
作者：
A. Saleh;J. M. Simmons
通讯作者：
A. Saleh;J. M. Simmons
DOI：
10.1109/oeccacoft.2008.4610575
发表时间：
2008-07
期刊：
OECC/ACOFT 2008 - Joint Conference of the Opto-Electronics and Communications Conference and the Australian Conference on Optical Fibre Technology
影响因子：
--
作者：
Qi Yang;W. Shieh;Yiran Ma
通讯作者：
Qi Yang;W. Shieh;Yiran Ma
DOI：
10.1109/lcomm.2009.091339
发表时间：
2009-10
期刊：
IEEE Communications Letters
影响因子：
--
作者：
Renhui Xu;Ming Chen
通讯作者：
Renhui Xu;Ming Chen