NeTS: Small: Foundations of Energy Efficient Wireless Multimedia Broadcasting

一个世纪以来，无线多媒体广播一直是人类娱乐的中心。虽然广播信令正在向数字化转型，但其基础设施仍不能支持无线数字广播的全部潜力。该项目开发了一个全面的框架，以实现可扩展和自适应的无线多媒体广播，用于设想的蜂窝式基础设施以及处于过渡阶段的基础设施。该方案由三部分组成：1)自适应信道编码方案，2)随机功率控制和天线波束形成算法，3)反馈信道媒体接入控制协议。在第一步中，研究开发了一种自适应编码方案，以在发射机具有最少的信道信息的情况下在动态无线信道上实现高效和可扩展的广播通信。在第二步中，研究开发了一种随机功率控制和天线波束形成框架，以在通信吞吐量和时延约束下优化广播系统的能量效率。在第三步中，研究开发了一种媒体接入控制协议，在不牺牲系统可伸缩性的情况下，使用最小的反馈信道带宽来反馈必要的信道信息。本项目还开发了一个无线计算机网络演示系统。

Wireless multimedia broadcast has been the central of human entertainments for a century. While the broadcasting signaling is being transformed to digital, its infrastructure is still incapable of supporting the full potential of wireless digital broadcast. This project develops a comprehensive framework to enable scalable and adaptive wireless multimedia broadcasting for an envisioned cellular-type infrastructure, as well as for infrastructures in transitional stages. The project consists of three components: 1) an adaptive channel coding scheme, 2) a stochastic power control and antenna beamforming algorithm, and 3) a feedback channel medium access control protocol. In the first step, the research develops an adaptive coding scheme to enable efficient and scalable broadcast communication over dynamic wireless channels with minimum channel information at the transmitters. In the second step, the research develops a stochastic power control and antenna beamforming framework to optimize energy efficiency of the broadcast system under communication throughput and delay constraints. In the third step, the research develops a medium access control protocol to feedback necessary channel information without sacrificing system scalability using a minimum amount of feedback channel bandwidth. This project also develops a demonstration system in wireless computer networks.