用于弱湍流和饱和湍流信道中自由空间光通信的混合脉冲位置调制与二进制相移键控副载波强度调制

Hybrid pulse position modulation and binary phase shift keying subcarrier intensity modulation for free space optics in a weak and saturated turbulence channel.

作者信息

Faridzadeh Monire, Gholami Asghar, Ghassemlooy Zabih, Rajbhandari Sujan

机构信息

Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.

出版信息

J Opt Soc Am A Opt Image Sci Vis. 2012 Aug 1;29(8):1680-5. doi: 10.1364/JOSAA.29.001680.

DOI:10.1364/JOSAA.29.001680

PMID:23201885

Abstract

In this paper a hybrid modulation scheme based on pulse position modulation (PPM) and binary phase shift keying subcarrier intensity modulation (BPSK-SIM) schemes for free-space optical communications is proposed. The analytical bit error rate (BER) performance is investigated in weak and saturated turbulence channels and results are verified with the simulation data. Results show that performance of PPM-BPSK-SIM is superior to BPSK-SIM in all turbulence regimes; however, it outperforms 2-PPM for the turbulence variance σ(1)(2)>0.2. PPM-BPSK-SIM offers a signal-to-noise ratio (SNR) gain of 50 dB in the saturation regime compared to BPSK at a BER of 10(-6). The SNR gain in comparison to PPM improves as the strength of the turbulence level increases.

摘要

本文提出了一种基于脉冲位置调制（PPM）和二进制相移键控副载波强度调制（BPSK-SIM）的混合调制方案，用于自由空间光通信。研究了在弱湍流和饱和湍流信道中的解析误码率（BER）性能，并通过仿真数据对结果进行了验证。结果表明，在所有湍流状态下，PPM-BPSK-SIM的性能均优于BPSK-SIM；然而，当湍流方差σ(1)(2)>0.2时，它的性能优于2-PPM。与BPSK相比，在误码率为10(-6)时，PPM-BPSK-SIM在饱和状态下提供了50 dB的信噪比（SNR）增益。随着湍流强度的增加，与PPM相比的SNR增益也会提高。