当前位置: X-MOL 学术IEEE J. Ocean. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Improving the Link Availability of an Underwater Wireless Optical Communication System Using Chirped Pulse Compression Technique
IEEE Journal of Oceanic Engineering ( IF 4.1 ) Pub Date : 2020-05-29 , DOI: 10.1109/joe.2020.2985555
Sanjay Kumar Sahu 1 , Palanisamy Shanmugam 1
Affiliation  

The effect of frequency chirping on the link availability of an underwater wireless optical communication (UWOC) system is studied theoretically using a simple and realistic model. It is observed, both theoretically and numerically, that a light pulse can be compressed in temporal axis when propagating in the water medium and can attain the minimum value at a prespecified location by appropriately choosing the initial pulse chirp parameter. The pulse compression takes place due to the interplay between the initial frequency chirp and the group velocity dispersion (GVD) effect. An increase in peak intensity, due to pulse compression, at the prespecified receiver location results in an improvement in the link availability compromised due to both attenuation and turbulence. The link availability is quantified by estimating the fading probability for various cases of initially chirped (+ve, 0, and −ve) Gaussian pulses under the influence of attenuation and turbulence and the results are compared for different scenarios. To have a complete channel description, the effect of particulate scattering on the GVD-induced pulse compression and hence on the fading probability is studied and quantified using the Monte Carlo numerical simulation technique. It is shown that, for the same system and channel parameters, the fading probability of a UWOC system is a few orders of magnitude lower (at a prespecified location) for the case with the negatively chirped pulse than for the cases when the initial pulse chirp is either zero or positive. In addition, the analytical expressions for estimating the focus distance and minimum pulse length, as functions of the channel properties, incident pulse length, and initial chirp parameters, are presented and discussed.

中文翻译:

使用Chi脉冲压缩技术提高水下无线光通信系统的链路可用性

理论上使用简单而现实的模型研究了频率线性调频对水下无线光通信(UWOC)系统的链路可用性的影响。据观察,在理论和数字,一个光脉冲可以在时间轴在水介质中传播时被压缩,并且通过适当地选择初始脉冲线性调频参量可在一预定的位置达到的最小值。脉冲压缩是由于初始频率线性调频和群速度色散(GVD)效应之间的相互作用而发生的。在预定的接收器位置,由于脉冲压缩,峰值强度的增加导致链路可用性的提高,该可用性由于衰减和湍流而受到损害。通过估计在衰减和湍流影响下初始initially(+ ve,0和-ve)高斯脉冲的各种情况下的衰落概率,可以量化链路可用性,并对不同情况下的结果进行比较。为了获得完整的信道描述,使用蒙特卡洛数值模拟技术研究并量化了颗粒散射对GVD引起的脉冲压缩的影响,从而对衰落概率的影响。结果表明,对于相同的系统和信道参数,对于负pulse脉冲的情况,UWOC系统(在预定位置)的衰落概率要比初始脉冲lower的情况低几个数量级。为零或正。此外,
更新日期:2020-05-29
down
wechat
bug