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Performance analysis of pulse position modulation-based hybrid technique for cellular backhaul free-space optical link

机译：基于脉冲位置调制的蜂窝回程自由空间光链路混合技术性能分析

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摘要

We investigate the performance of half-cosine pulse-shaped hybrid pulse position modulation-orthogonal frequency division multiplexing (HC-PPM-OFDM) under weak (i.e., log-normal) and strong (i.e., gamma-gamma) turbulence free-space optical channel. Joint impact of frequency and time offset on the performance parameters such as intercarrier interference, a symbol to interference ratio, and bit-error rate are also investigated. This research aims to improve the spectral efficiency performance of traditional PPM through the proposed hybrid technique. Further, the proposed HC-PPM-OFDM technique is compared with pulse position modulation-minimum shift keying (PPM-MSK), PPM, and hybrid PPM-OFDM. Obtained results show comprehensive improvement in the performance parameters under both weak and strong atmospheric turbulences. In addition to the above results, the upper-bound channel capacity expression is derived for log-normal as well as gamma-gamma turbulence channel models. Obtained results reveal that the proposed modulation technique outperforms PPM and PPM-MSK techniques under all turbulence conditions at a marginal COSt Of power penalty.
机译：我们研究在弱（即对数正态）和强（即γ-γ）湍流自由空间光学条件下半余弦脉冲形混合脉冲位置调制-正交频分复用（HC-PPM-OFDM）的性能渠道。还研究了频率和时间偏移对性能参数（如载波间干扰，符号干扰比和误码率）的共同影响。本研究旨在通过提出的混合技术来改善传统PPM的频谱效率性能。此外，将提出的HC-PPM-OFDM技术与脉冲位置调制-最小频移键控（PPM-MSK），PPM和混合PPM-OFDM进行了比较。所得结果表明，在弱和强大气湍流下，性能参数都得到了全面改善。除上述结果外，还针对对数正态以及伽玛-伽玛湍流通道模型推导了上限通道容量表达式。所得结果表明，在所有湍流条件下，边际成本损失为CoSt时，所提出的调制技术均优于PPM和PPM-MSK技术。

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