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

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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.