Collaborative Research: Architecture and Implementation of Intelligent Transceivers for Ultra-Wideband Communications

0424196Gharpurey 2002 年 2 月，联邦通信委员会 (FCC) 修订了其第 15 部分发射规则，并允许商业超宽带 (UWB) 传输设备使用大部分射频 (RF) 频谱。对这些设备施加的限制包括对 3.1 至 10.6 GHz 范围内 -41 dBm/MHz 的发射功率谱密度的限制以及 500 MHz 的最小信号带宽。如此宽的带宽的可用性使得一些新的短距离、低功耗、高比特率的通信、测距和定位应用成为可能。使用上述带宽的工业标准建议可实现非常令人印象深刻的吞吐量性能。然而，由于上市时间是一个主要限制，因此许多标准使用了众所周知的基于运营商的通信方法的变体。这项新的 FCC 政策首次允许公众使用如此大的频谱。因此，与基于载波的调制技术的传统窄带方法相比，它为无线通信领域的全新研究提供了机会，例如全新的信令方法和架构及其集成电路实现。 智力优点：PI建议利用这一独特的机会来研究用于UWB无线电应用的收发器的高效集成电路实现。他将探索信令和系统级别以及架构和集成电路实现级别之间的权衡。 他建议研究一种易于实施的数字多载波 UWB 信令格式，有望缓解 UWB 通信的主要问题，即干扰和多径。他还计划研究一种低功率干扰检测器，该检测器可以检测给定频段中是否存在不需要的信号。该探测器与其他收发器共享干扰信息，并允许采用独特的智能干扰缓解策略。干扰检测策略可以与所提出的信令格式很好地结合，并且硬件成本或功率开销最小。 这些创新是通过我们在 VLSI 集成电路中高效实现收发器方面提出的研究工作来实现的。 UWB 中的低 RF 输出功率水平为使用当前和未来的纳米 CMOS 技术并利用它们提供的令人印象深刻的操作速度提供了可能性。他计划开发收发器的电路实现，包括宽带放大器、高线性度相关器和匹配滤波器、高速 D/A 和 A/D 转换器以及输出缓冲器等电路块。 更广泛的影响：通信技术，更具体地说，无线通信技术在开发可广泛访问的网络基础设施方面发挥着重要作用。 UWB 无线电技术为应用开辟了令人兴奋的新机会，而对实现高效物理层的拟议研究是应用的关键推动因素。缺乏对通信系统方面问题有深入了解的模拟、混合信号和射频集成电路设计人员，一直是该领域发展面临的持续挑战。通过研究经验和课程，他的项目将教育研究人员和电路设计人员具备跨学科技能，以便在他们运行的系统背景下发明新的集成电路设计原理。该项目涉及不同机构的 PI 之间的合作。它利用了两位 PI 的行业专业知识和研究背景。它还为研究生和本科生提供了与更广泛的研究工作互动的独特机会。为了增加这一新兴领域学生的教育机会，我们将开发新课程。建议为本科生提供研究体验计划，该计划将提供专门设计的研究项目，以提供实践经验并扩展他们的专业知识。

0424196GharpureyIn February 2002, the Federal Communications Commission (FCC) revised its Part 15 emission rules and allowed the use of a large section of the radio-frequency (RF) spectrum by commercial ultra-wideband (UWB) transmission devices. The restrictions imposed on these devices include a limit on the transmitted power spectral density of -41 dBm/MHz from 3.1 to 10.6 GHz and a minimum signal bandwidth of 500 MHz. The availability of such a wide bandwidth has enabled several new short-distance, low-power, high bit-rate applications for communication, ranging and location-finding. Industrial standards proposals for the use of the above bandwidth allow for very impressive throughput performance. However, since time-to-market is a major constraint, many of these standards use variants of well-known carrier-based communication methods.This new FCC policy allows the public use of such a large spectrum for the first time. Thus it opens opportunities for fundamentally new research in wireless communications in topics such as radically new signaling methods and architectures, and their integrated circuit realization, in contrast with the traditional narrow-band approach of carrier-based modulation techniques.Intellectual Merits: The PI proposes to use this unique opportunity to research highly efficient, integrated circuit implementations of transceivers for UWB radio applications. He will explore the trade-offs between the signaling and system level, and the architectural and integrated circuit implementation level. He proposes to investigate an implementation-friendly digital multi-carrier UWB signaling format that is expected to alleviate major issues with UWB communications, namely interference and multipath. He also plans to investigate a low-power interference detector which detects the presence of undesired signals in given frequency bands. The detector shares interference information with other transceivers and allows for a unique intelligent interference mitigation strategy. The interference detection strategy can be combined very well with the proposed signaling format, with minimal hardware cost or power overhead. These innovations are enabled by our proposed research efforts in the efficient implementation of transceivers in VLSI integrated circuits. The low RF output power-levels in UWB open the possibility to use current and future nanometer CMOS technologies and exploit the impressive operation speed they offer. He plans to develop a circuit implementation of the transceivers including such circuit blocks as broadband amplifiers, high linearity correlators and matched filters, high-speed D/A and A/D converters, and output buffers.Broader Impacts: Communication technologies and more specifically wireless communicationtechnologies play a prominent role in developing a broadly accessible cyber-infrastructure. UWB radio technology opens exciting new opportunities for applications and the proposed research on the realization of an efficient physical layer is crucial enabler towards applications.The shortage of analog, mixed-signal, and RF integrated circuit designers, with in-depth knowledge of the communication systems aspects of the problem, has been a continuous challenge for the advancement of this field. Through research experiences and courses, his program will educate researchers and circuit designers with the cross-disciplinary skills to invent new design principles for integrated circuits in the context of the system in which they operate.The program involves the collaboration of PIs at different institutions. It leverages the industrial expertise and research backgrounds of both PIs. It further offers unique opportunities for graduate and undergraduate students to interact with a broader research effort. To enhance the educational opportunities for students in this emerging field, new courses will be developed. For undergraduate students a research experience program is proposed that will offer research projects specifically designed to provide hands-on experience and extend their expertise.