自由空间光通信中相干OFDM系统性能分析
发布时间：2018-09-06 15:04
【摘要】：结合正交频分复用(OFDM)技术和相干探测的优势,研究了相干OFDM自由空间光通信(FSO)系统的误码性能,考虑了OFDM映射方式以及映射阶数对系统误码性能的影响。在GammaGamma大气湍流信道下,分别从平均信噪比和所需平均接受光功率的角度考虑了系统在弱、中和强湍流三种情况下的误码性能。在此基础上,推导了系统误符号率的闭合表达式。仿真结果表明,相干探测下OFDM FSO系统可以较好地克服大气湍流效应,在弱、中湍流情况下,QAM映射方式下系统的误码性能明显优于PSK方式,在强湍流下这种优势不明显,此外随着映射阶数的增加,系统误符号率增加,因此在实际应用中可以通过降低映射阶数来提高系统误码性能。
[Abstract]:Combined with the advantages of orthogonal frequency division multiplexing (OFDM) and coherent detection, the error performance of coherent OFDM free space optical communication (FSO) system is studied. The effect of OFDM mapping mode and mapping order on the system error performance is considered. In the GammaGamma atmospheric turbulent channel, the error performance of the system in weak, moderate and strong turbulence is considered from the point of view of the average signal-to-noise ratio (SNR) and the required average optical power. On this basis, the closed expression of system symbol error rate is derived. The simulation results show that the OFDM FSO system under coherent detection can overcome the atmospheric turbulence effect well, and the BER performance of the system under weak and medium turbulence is obviously better than that of PSK, but this advantage is not obvious in strong turbulence. In addition, with the increase of mapping order, the symbol error rate of the system increases, so the system error performance can be improved by reducing the mapping order in practice.
【作者单位】： 哈尔滨工业大学可调谐激光器国家重点实验室;中国计量学院信息工程学院;
【基金】：海洋工程国家重点实验室(上海交通大学)(1213) 中国博士后科学基金(2013M540290) 浙江省自然科学基金(LQ14E060003)
【分类号】：TN929.1
[Abstract]:Combined with the advantages of orthogonal frequency division multiplexing (OFDM) and coherent detection, the error performance of coherent OFDM free space optical communication (FSO) system is studied. The effect of OFDM mapping mode and mapping order on the system error performance is considered. In the GammaGamma atmospheric turbulent channel, the error performance of the system in weak, moderate and strong turbulence is considered from the point of view of the average signal-to-noise ratio (SNR) and the required average optical power. On this basis, the closed expression of system symbol error rate is derived. The simulation results show that the OFDM FSO system under coherent detection can overcome the atmospheric turbulence effect well, and the BER performance of the system under weak and medium turbulence is obviously better than that of PSK, but this advantage is not obvious in strong turbulence. In addition, with the increase of mapping order, the symbol error rate of the system increases, so the system error performance can be improved by reducing the mapping order in practice.
【作者单位】： 哈尔滨工业大学可调谐激光器国家重点实验室;中国计量学院信息工程学院;
【基金】：海洋工程国家重点实验室(上海交通大学)(1213) 中国博士后科学基金(2013M540290) 浙江省自然科学基金(LQ14E060003)
【分类号】：TN929.1
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