用多目标优化方法降低ddoofdm系统的保护频带

2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2015-11-01 DOI:10.1109/IMOC.2015.7369126

E. Pereira, H. Rocha, Reginaldo B. Nunes, M. Segatto, Jair A. L. Silva

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引用次数: 1

摘要

提出了直接检测光正交频分复用(DDO-OFDM)系统短距离链路参数的多目标优化方法。基于遗传算法(GA)的优化过程考虑了光功率对4 qam和16 qam子载波映射的多载波系统的保护带降低的影响，并且在40km标准单模光纤(SSMF)中传播。仿真结果表明，在误码率为10-3的情况下，当保护带(BG)等于信号带宽(Bw)的50%，16-QAM [4-QAM]子载波映射时，ddoofdm系统在40km的无补偿SSMF传输中，参数优化可使所需光功率增益≈2.5 dB[≈1.8 dB]。对于仅为1% Bw的极低保护带，16-QAM和4-QAM映射的增益分别降至≈0.5 dB和≈1.5 dB。

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Reducing the guard-band of a DDO-OFDM system by Multi-objective optimization

A Multi-objective optimization on the parameters of direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) systems in short-range links is proposed. Based on Genetic Algorithms (GA), the optimization process takes into account the influence of optical power in the guard-band reduction of such multicarrier systems with 4 and 16-QAM subcarrier mapping and for propagation in 40 km of standard single-mode fiber (SSMF). Simulation results show that the parameters optimization is responsible for a gain of ≈ 2.5 dB [≈ 1.8 dB] in the required optical power for a bit-error-rate of 10-3, for DDO-OFDM system transmission over 40 km of uncompensated SSMF, with a guard band (BG) equals to 50% of the signal bandwidth (Bw) and 16-QAM [4-QAM] subcarrier mapping. For a extremely reduced guard-band of only 1% of Bw, the gain reduced to ≈ 0.5 dB and ≈ 1.5 dB for 16-QAM and 4-QAM mapping, respectively.

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2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)

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