SBIR Phase I: Development of MAC-to-PHY Convergence Tools for Broadband Fixed Wireless Access

这个小型企业创新研究(SBIR)第一阶段项目将解决5 GHz以下宽带固定无线接入商业发展的主要障碍之一，即克服距离敏感传播条件产生的“融合瓶颈”。众所周知，当距离从视线到远超出视线的范围时，传输参数可能会急剧下降。然而，目前的最新技术水平以一种非常不令人满意的方式来处理这种情况，通过统计模型、“握手”方案、调制回退、使用前导和嵌入导频，仅举几例。我们将展示一种创新的概念，用于快速、双向、不显眼且易于扩展的射频测量，允许精确地描述数千条集线器到用户路径的特征，而无需猜测。由于网络能够以接近最佳的传输特性快速融合，地区运营中心、枢纽基站和消费者终端的运行效率将更高。这项创新将使生活和工作在不提供DSL、光纤和电缆调制解调器服务的人群更容易获得宽带。这包括：在户外场所、在难以到达的学校、图书馆、大学校园、交通系统、工厂、水道和小企业工作的人。

This Small Business Innovative Research (SBIR) Phase I project will address one of the major obstacles to commercial development of broadband fixed wireless access under 5 GHz, namely overcoming a "convergence bottleneck" arising from distance-sensitive propagation conditions. It is well known that as distance ranges from line of sight to well beyond line of sight, transmission parameters can degrade dramatically. However, current state-of-the-art treats this condition in a highly unsatisfactory way, through statistical models, through "handshake" schemes, modulation fallback, use of preambles and embedded pilot tones, to name just a few. An innovative concept will be demonstrated for rapid, two-way, unobtrusive and easily scaled RF measurements that permit characterizing thousands of hub-to-subscriber paths precisely without guesswork. Regional operations centers, hub base station and consumer terminals will operate more efficiently due to the network's ability to converge rapidly on near-optimum transmission characteristics. This innovation will make broadband more readily available to populations that live and work where DSL, fiber, and cable modem service is not offered. This includes: people who work in outdoor locations, in hard-to-get-to schools, libraries, college campuses, transportation systems, factories, waterways, and small businesses.