Towards Hybrid Wireless Networking under Adverse Channels

ECCS-1002288 Hazem RefaiUniversity of Oklahoma Towards Hybrid Wireless Networking under Adverse ProblemsAbSTRACTIntellectual Merit：如果大气湍流造成的不利影响没有得到准确补偿，光无线通信的潜在优势就达不到合理的预期。恶劣的天气条件会降低系统的性能，导致误码率（BER）、数据包丢失和网络延迟的增加，以及网络吞吐量的降低。本计画的目标是设计一个混合式光/射频系统，以抵抗大气紊流造成的不良光通道条件所造成的劣化。实验研究和理论建模相结合将被用来实现这样的系统。该研究将包括设计一种光收发器，该光收发器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和消耗最小的功率。该研究将研究使用适当的波长进行数据传输，以尽量减少天气的影响，并在不增加传输功率的情况下最大限度地扩大范围。当前的光信道估计算法将被检查和合适的将开发基于多帧平均。将使用可用波长进行估计。硬件设计和软件算法的指向，采集和跟踪（PAT）的最新方法将被检查，以支持之间的光通信移动的飞行器和固定在预先确定的，已知的locations.Broader影响：所提出的项目的直接影响是一个独特的光收发器，这将实现多个波长的发展。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技术来满足的对全时连接的需求可能会转向使用光学技术。这可以通过抑制几乎每天引入许多各种RF设备而导致的RF噪声水平的快速增加来帮助。工作成果具有机载互联网和战场通信应用。研究生将接受培训，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.