可靠的地面无线通信系统,实现更高的比特率

S. Muhammad, C. Chlestil, E. Leitgeb, M. Gebhart
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引用次数: 10

摘要

在过去几年中,自由空间光学(FSO)领域取得了重大进展,以满足对更大带宽和改进通信系统的需求。FSO系统通常被设计为带宽和协议透明的物理层连接。FSO主要是作为宽带无线解决方案发展起来的,用于解决整个城域网的“最后一英里”连接缺口。宽带通信研究所已经开发了几个fso系统,目前正在开发一些较新的系统。在以前的系统中,主要重点是使用led而不是激光二极管,并且系统的开发距离约为300毫安,比裕度为25分贝/公里。目前,我们正在开发将提供高达1gbps数据速率的系统,从而提供充分利用千兆光骨干的机会。此外,正在进行调查,以采用更好和更合适的调制和信道编码技术,以提高现有系统的性能。除了“最后一英里宽带接入”之外,FSO的应用还包括灾难恢复、远程医疗、远程教学和非常规地点的勘探。自由空间光学(FSO)是一种光纤激光驱动技术,支持高带宽,易于安装连接,实现最后一英里的接入。自由空间光学系统作为一种替代昂贵的基于光纤的解决方案,开始在私人市场上获得认可。光无线现在允许服务提供商经济有效地为网络提供光带宽,降低资本支出和运营成本。今天,现代互联网用户非常倾向于高带宽要求的应用,如视频点播、视频会议、语音服务等,而FSO是一种非常适合的技术,可以使骨干网(光纤网络)的高带宽提供给最终用户。格拉茨技术大学宽带通信研究所的光通信工作组(Optikom)在自由空间光学(FSO)领域进行了为期十年的研究。这项工作包括开发用于研究目的的设备,并与工业伙伴合作评估格拉茨(奥地利)气候的商用FSO系统。在本文中,我们介绍了一些我们早期开发的用于短距离可靠FSO链路的系统,以及在我们的系统中使用鲁棒,高速率led而不是更常见的激光二极管来开发具有成本效益的系统。我们还强调了目前正在进行的开发超高速千兆自由空间光学系统的工作,以使最终用户可以访问千兆骨干网。无线光通信发展的一个重要方面一直是大气的影响和对无线光通信链路可用性和可靠性的怀疑。我们正在研究通过使用更合适的调制和信道编码技术来提高FSO系统性能的可能性,并在这方面提出了一些初步的工作。FSO的应用非常多样化,本文展示了应用领域的一些重要方面和使用该技术的可能性,不仅用于最后一英里接入,还用于灾难恢复和管理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reliable terrestrial FSO systems for higher bit rates
S ignificant advances have been made in the field of Free Space Optics (FSO) over the last few years in response to a need for greater bandwidth and improved communication systems. FSO systems are generally designed as bandwidth and protocol transparent physical layer connections. FSO has mainly evolved as the broadband wireless solution for the "Last Mile" connectivity gap throughout the metropolitan networks. At the Institute of Broadband Communications several FSO-systems have been developed and some newer systems are under development currently. In the previous systems, the main emphasis was on using LEDs instead of laser diodes and systems were developed for distances of about 300 ma t as pecific margin of 25 dB/km. Currently, we are developing systems that will provide data rates up-to 1 Gbps, thus providing an opportunity to fully utilize the gigabit optical backbone. Additionally, investigations are being carried out into employing better and well suited modulation and channel coding techniques to enhance the performance of the current systems. Applications of FSO besides the "last-mile broadband access" lie in disaster recovery, Tele-medicine, Tele-teaching and in explorations at unusual locations. Free Space Optics (FSO) is a fibreless, laser-driven technology that supports high bandwidth, with easy to install connections for the last mile access. Free Space Optics systems are starting to gain acceptance in the private market place as a solution to replace expensive fibre-optic based solutions. Optical wireless now allows service providers to cost-effectively provide optical band- width for networks, reducing Capex and Opex. Today, the modern internet users are very much inclined towards the high bandwidth demanding applications, like Video on Demand, Video Conferencing, Voice services, etc. and FSO is a well-suited technology to make the high bandwidth of the backbone (Fibre network) available to the end-user. The workgroup for Optical Communications (Optikom) at the Institute of Broadband Communications, Technical University Graz, has carried out research in the field of Free Space Optics (FSO) over a period of ten years. The work included the development of equipment for research purposes and the evaluation of commercially available FSO systems for the climate in Graz (Austria) in co-operation with industrial partners. In this paper, we present some of our earlier developed systems for short range reliable FSO links, and the uti- lization of robust, high rate LEDs in our systems instead of the more common laser diodes for developing cost effective systems. We also highlight the current work we are carrying out into the development of very high-speed Gigabit Free Space Optics Systems, to make the Gigabit backbone accessible for the end-user. An important aspect in FSO developments has always been the influence of the atmosphere and the doubts about the availability and reliability of the FSO links. We are investigating possi- bilities of enhancing the performance of the FSO systems by using more suitable modulation and channel coding techniques, and we present some preliminary work in this regard. The applications of FSO are very diversified and the paper shows some important aspects of the application areas and possibilities of using the technology not only for the last mile access but also in disaster recovery and management.
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