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首页> 外文会议>IEEE International Conference on Telecommunications and Photonics >Effect of weak atmospheric turbulence on the BER performance of an optical CDMA FSO link with Sequence Inverse Keying (SIK) balanced photodetector receiver
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Effect of weak atmospheric turbulence on the BER performance of an optical CDMA FSO link with Sequence Inverse Keying (SIK) balanced photodetector receiver

机译：弱湍流对具有序列反向键控（SIK）平衡光电探测器接收器的CDMA FSO光链路的BER性能的影响

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摘要

Analytical approach is presented to evaluate the effect of weak atmospheric turbulence on the bit error rate (BER) performance of an optical code division multiple access (OCDMA) free space optical (FSO) link using optical domain encoder and Sequence Inverse Keying (SIK) balanced photodetector receiver. The analysis is carried out to find the expression of the signal current and multi access interference (MAI) current at the output of the SIK receiver considering the effect of atmospheric turbulence of the channel. The conditional BER conditioned on a given atmospheric turbulence is evaluated and the average BER is obtained by averaging the conditional BER over the probability density function (pdf) of atmospheric turbulence. The results are evaluated for different code length, number of simultaneous users, turbulence variances and other system parameters. The performance of an OCDMA link is found to be highly degraded due to atmospheric scintillation and the power penalty due to turbulence effect is of the order of 2 to 10 dB depending on the turbulence variance. For example, power penalty is 3 dB to 10 dB at a BER of 10-9 for 12 numbers of users at 1 Gbps corresponding to turbulence variance 0.01 to 0.3 respectively. However, the penalty can be reduced significantly by increasing the processing gain.
机译：提出了一种分析方法，用于评估弱湍流对使用光域编码器和序列反向键控（SIK）平衡的光码分多址（OCDMA）自由空间光（FSO）链路的误码率（BER）性能的影响光电探测器接收器。考虑到信道的大气湍流的影响，进行分析以找到SIK接收机输出端的信号电流和多址干扰（MAI）电流的表达式。评估以给定的大气湍流为条件的条件BER，并通过在大气湍流的概率密度函数（pdf）上对条件BER进行平均来获得平均BER。针对不同的代码长度，同时使用的用户数量，湍流变化和其他系统参数评估结果。发现OCDMA链路的性能由于大气闪烁而大大降低，并且取决于湍流变化，由于湍流效应而导致的功率损失约为2至10 dB。例如，对于12个数量为1 Gbps的用户，BER为10-9时，功率损失为3 dB至10 dB，分别对应于0.01至0.3的湍流变化。但是，可以通过增加处理增益来显着减少损失。

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