Coding, Modulation and Detection for Power-Efficient Low-Complexity Impulse-Radio Ultra-Wideband Transmissions Systems (CoMoDe IR-UWB)

冲激无线电(IR)超宽带技术被广泛认为是未来低功耗、低复杂度短距离数据传输系统的物理层。通过消除接收器处的信道估计，IR-UWB的变体，例如差分传输参考(DTR)IR-UWB，使得能够进一步降低检测复杂度。然而，除非采用先进的接收器技术，例如多符号差分检测，否则降低复杂度是以显著降低功率效率为代价的。该项目旨在提高DTR IR-UWB系统的功率效率与复杂度之间的权衡，由于结合解调和信道译码，软输出多符号检测器是至关重要的，本项目的第一部分将研究针对DTR IR-UWB系统的具体情况产生软输出的球形译码类型的算法。软输出的质量以及所需的复杂性将令人感兴趣。在项目的第二部分，研究了IR-UWB多用户场景中的上行链路，重点研究了这种多址方案下的联合接收机，特别是设计了联合执行多符号和多用户检测的算法。此外，还将研究将接收器扩展到也可以处理窄带干扰。本课程将评估具有可管理复杂性的接收器概念，以及信息论对功率交换和带宽效率的基本限制。

Impulse radio (IR) UWB technology is widely considered as physical layer for future power-efficient and low-complexity short-range data transmission systems. By eliminating channel estimation at the receiver, variants of IR-UWB such as differential transmitted reference (DTR) IR-UWB have enabled further reductions of detection complexity. However, unless advanced receiver techniques such as multiple-symbol differential detection are employed, the complexity reduction comes at the cost of a dramatically reduced power efficiency. The proposed project is concerned with the enhancement of the powerefficiency- vs.-complexity tradeoff for DTR IR-UWB systems.Since for the combination of demodulation and channel decoding, soft-output multiple- symbol detector are of major importance, the first part of the project will investigate sphere-decoder-type algorithms generating soft output tailored to the specific situation of DTR IR-UWB systems. The quality of the soft output as well as the required complexity will be of interest. In the second part of the project, the up-link in an IR-UWB multiuser scenario is studied with focus on joint receivers for this multiple-access scheme.In particular, algorithms for jointly performing multiple-symbol and multi-user detector are to be designed. In addition, the extension of the receiver to also treat narrow-band interferer will be investigated. Receiver concepts with manageable complexity, as well as fundamental limits from information theory for the exchange of power and bandwidth efficiency will be assessed.