Towards Hybrid Wireless Networking under Adverse Channels

ECCS-1002288Hazem Refai俄克拉荷马大学下行混合无线网络在不利信道下摘要智能优点：如果不能准确补偿大气湍流造成的不利影响，光无线通信的潜在优势将达不到合理的预期。恶劣的天气条件降低了系统的性能，导致误码率(BER)、分组丢失和网络延迟增加，以及网络吞吐量下降。本项目的目标是设计一种能够抵抗由于大气湍流导致的光信道条件恶劣而导致的衰落的光/射频混合系统。将采用实验研究和理论建模相结合的方法来实现这样一个系统。这项研究将包括设计一种光收发器，它将有效地处理使用不同波长的光传输，同时保持轻型光接口并消耗最低功率。这项研究将研究使用适当的波长进行数据传输，以最大限度地减少天气影响，并在不增加传输功率的情况下最大限度地扩大射程。将研究现有的光信道估计算法，并开发基于多帧平均的合适的算法。估计将使用可用波长进行。将研究最新的指向、捕获和跟踪(PAT)方法的硬件设计和软件算法，以支持移动飞行器和固定在预定已知位置的静止飞行器之间的光通信。广泛影响：拟议项目的直接影响是开发一种独特的光收发器，它将实现多波长。这项工作的结果将使自由空间光学成为各种无线应用的可行选择。因此，目前通过使用RF技术满足的对全天候连接的需求可能会转向使用光技术。这可能有助于遏制由于几乎每天都有各种射频设备的引入而导致的射频噪声水平的快速增加。该工作的成果已在机载互联网和战场通信中得到应用。将对研究生进行培训，并利用一个主要的本科生培训计划。

ECCS-1002288Hazem RefaiUniversity of OklahomaTowards Hybrid Wireless Networking under Adverse ChannelsABSTRACTIntellectual Merit: The potential advantages of optical wireless communication fall short of reasonable expectations if adverse effects caused by atmospheric turbulence are not accurately compensated for. Adverse weather conditions degrade the performance of the system, causing increased bit error rate (BER), packet loss and network delays, as well as decreased network throughput. The objective of this project is to design a hybrid optical/RF system that is resistive to degradations caused by poor optical channel condition due to atmospheric turbulence. Combinations of experimental research and theoretical modeling will be utilized to realize such a system. The research will include the design of an optical transceiver that will efficiently handle optical transmission using different wavelengths while maintaining a light-weight optical interface and consuming minimal power. The research will examine the use of proper wavelengths for data transmission to minimize the influence of weather and maximize range without increasing transmission power. Current optical channel estimation algorithms will be examined and suitable ones will be developed based on multi-frame averaging. Estimation will be carried out using available wavelengths. The hardware design and software algorithms for the most current methods of pointing, acquiring, and tracking (PAT) will be examined to support optical communication between mobile aerial vehicles and stationary vehicles fixed at pre-determined, known locations.Broader Impacts: The direct impact of the proposed project is the development of a unique optical transceiver, which will implement multiple wavelengths. Results of the work would make free-space optics a viable option for various wireless applications. Hence, the demand for all-time connectivity that is currently satisfied through the use of RF technologies may shift toward using optical technologies. This could aid by curbing the rapid increase in RF noise level caused by the almost daily introduction of a number of various RF devices. Results of the work have airborne Internet and battlefield communication applications. Graduate students will be trained, and a major undergraduate training program is leveraged.