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首页> 外文会议>International Conference on Future Computer and Communication;ICFCC >Acquisition Time for Laser Uplink Communication to Space-borne Satellite Using Transmit Diversity in Atmospheric Turbulence
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Acquisition Time for Laser Uplink Communication to Space-borne Satellite Using Transmit Diversity in Atmospheric Turbulence

机译：利用大气湍流中的发射分集与星载卫星进行激光上行链路通信的采集时间

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摘要

A laser beam propagating through a random medium such as atmosphere will experience irradiance fluctuations due to the presence of turbulence. The turbulence induced fading can be circumvented by implementing transmit diversity which involves the deployment of multiple laser transmitters at the ground station. In this paper, performance of laser uplink communication with transmit diversity in atmospheric turbulence channels has been analyzed in terms of acquisition time for coherent (sub-carrier BPSK and QPSK) and noncoherent (OOK and Q-PPM) modulation schemes. In the analysis, both uncorrelated and correlated uplink laser beams are considered. It has been observed that transmit diversity decreases the acquisition time in all the modulation schemes irrespective of turbulence strength. Sub-carrier BPSK gives the least acquisition time to acquire the space borne satellite among all the modulation schemes. In case of noncoherent modulation schemes, OOK gives slightly better results than 2-PPM but there is an improvement in the acquisition time of Q-PPM as the value of Q increases.
机译：通过湍流等随机介质传播的激光束会出现辐照度波动。湍流引起的衰落可以通过实现发射分集来避免，该分集涉及在地面站部署多个激光发射器。在本文中，根据相干（子载波BPSK和QPSK）和非相干（OOK和Q-PPM）调制方案的获取时间，分析了大气湍流信道中具有发射分集的激光上行链路通信的性能。在分析中，考虑了不相关和相关的上行链路激光束。已经观察到，不管湍流强度如何，在所有调制方案中，发射分集都减少了捕获时间。在所有调制方案中，副载波BPSK给出的获取时间最少，可以获取星载卫星。在非相干调制方案的情况下，OOK的结果比2-PPM略好，但是随着Q值的增加，Q-PPM的采集时间有所改善。

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