ITR: Generalized Ultrawideband for High Speed Networking

无线网络正以指数级的速度成功部署在公共、企业和科学网络环境中。这种网络支持漫游和动态环境，比有线网络更容易部署，而且往往更便宜，并提供可以简单修改的灵活配置。目前正在进行若干努力以开发用于无线个人区域网（WPAN）、无线局域网（WLAN）和存储区域网（SAN）的高速无线技术。 该项目研究的理论基础，以及与超宽带（UWB）通信的基础上的两个无线高速网络技术的实施挑战。第一种系统适用于处理功耗问题较小的超高速网络应用，例如存储区域网络和家庭网络。第二种系统非常适合WPAN中功率受限的消费电子设备，例如项目团队积极参与的IEEE 802.15.3a标准化工作所设想的场景。2002年，FCC发布了3.1 GHz至10.6 GHz频段，用于在FCC法规第15部分下运行的UWB通信。UWB通信系统使用具有大于中心频率的25%或大于1.5GHz的分数带宽的信号。先前的研究表明，UWB通信系统提供了几个潜在的优点，包括更高的可靠性，更低的功耗和提供精细测距信息的能力。最重要的是，它们支持重叠通信，这是解决频谱拥塞的关键。这种统一的观点导致了新的UWB方案，提高了频谱效率。它还简化了使用宽带信号生成技术的UWB脉冲序列的设计和生成。由此产生的广义UWB方案依赖于已知的基带调制方案与现有的经济芯片级实现，和自适应敏捷扩频方法，检测和避免窄带系统。它们继承了UWB通信和底层基带调制方案的优点。该项目特别关注实现问题，重点是实现的成本和复杂性之间的权衡，频谱效率和最大可实现的比特率。例如，它研究了新颖的一位新颖的模数和数模转换结构，这些结构与该项目关注的基带调制方案以及广义UWB应用中设想的高比特率很好地匹配。这些结构在目前的工作之外也有适用性。

Wireless networks are being successfully deployed at an exponential rate in public, enterprise and scientific networking environments. Such networks support roaming and dynamic environments, are easier and often cheaper to deploy than their wired counterparts and offer flexible configurations that can simply be modified. Several efforts are currently under way to develop high-speed wireless technology for wireless personal area networks (WPANs), wireless local area networks (WLANs) and storage area networks (SANs). This project is studying the theoretical underpinnings as well as the implementation challenges associated with two wireless high-speed networking technologies based on ultrawideband (UWB) communications. The first system is suitable for very high-speed networking applications where processing power consumption is less of an issue, such as storage area networks and home networks. The second system is an excellent match for power constrained consumer electronic devices in a WPAN, such as the scenarios envisioned by the IEEE 802.15.3a standardization effort in which the project team is actively participating. The project is making progress towards a demonstration of the latter technology in a wireless personal area network video-streaming scenario.In 2002, the FCC released the 3.1 GHz to 10.6 GHz band for UWB communications operating under part 15 of the FCC regulations. UWB communication systems use signals with a fractional bandwidth that is larger than 25% of the center frequency, or more than 1.5 GHz. Prior research established that UWB communication systems offer several potential advantages, including higher reliability, lower power consumption and ability to provide fine ranging information. Most importantly, they support overlaid communications, a key to addressing spectral congestion.The project recently produced a unified view of UWB schemes. ThisUnified view has led to novel UWB schemes with enhanced spectral efficiency. It has also simplified the design and generation of UWB pulse trains using broadband signal generation techniques. The resulting generalized UWB schemes rely on well-known baseband modulation schemes with existing economical chip level implementations, and adaptive agile spreading approaches that detect and avoid narrowband systems. They inherit the advantages of both UWB communications and those of the underlying baseband modulation scheme. The project pays particular attention to implementation issues, focusing on trade-offs between cost and complexity ofimplementation, and spectral efficiency and maximal achievable bit rates. For example, it examines novel one bit novel analog-to-digital and digital-to-analog conversion structures that are well matched to the baseband modulation schemes that the project focuses on, and the high bit rates envisioned in the applications of generalized UWB. These structures are finding applicability beyond the ongoing work.