Universität Stuttgart
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Item Open Access Multi-gigabit millimeter wave communication links(2015) Antes, Jochen; Kallfass, Ingmar (Prof. Dr.-Ing.)This dissertation is concerned with the search for new approaches to realize multi-gigabit wireless communication links. To satisfy the consumers’ growing demand for high-speed mobile connections, the achievable data rate in future wireless front- and backhaul applications, building the mobile network’s backbone, but also in short range wireless connections, needs to be significantly increased. Following latest discussions and statements, data rates well beyond 10 Gbit/s will be necessary for these use cases. To the present day, such wireless links are realized in the microwave regime, where the maximum data rates are limited by the restricted bandwidths achievable technologically at these carrier frequencies, as well as restraining frequency allocations. First approaches utilizing frequencies in the higher millimeter wave regime, i.e. above of 100 GHz, so far only operate with bandwidth-inefficient amplitude shift keying signals or use opto-electronics to generate a millimeter wave signal. The latter systems are also capable of using complex modulation formats but, up to now, are limited by comparably low transmit powers. To provide wireless links enabling multi-gigabit capacities combined with adequate reliability, new approaches in the realization of such systems will be necessary. The use of electrical millimeter wave integrated circuits, capable of operating in this high frequency regime, will result in compact, light-weight and easy-to-deploy frontend components and also allow to transmit over much higher distances. Combining the advantages of extremely high bandwidths achievable with these circuits with the possibility of using bandwidth efficient complex modulation formats will take wireless com- munication to a new level. The challenge hereby is to relate effects intro- duced on component level to repercussions which appear on system level, and, in a further step, reveal their impact and optimization potential. In this thesis, the necessary aspects for the realization of all-electrical multi-gigabit wireless communication system in the millimeter wave regime are considered. A study of appropriate approaches of circuit topologies suitable to realize extremely broadband transmit and receive components allowing for multi-gigabit capability, as well as the design and realization of such circuits build the basis for a profound analysis of such transmission systems. An investigation of the wireless system’s transmission quality under the influence of the frontend component’s non-idealities reveal the system’s limits but also the optimization poten- tial. Finally, free space data transmission experiments are conducted to prove the feasibility of multi-gigabit communication links operating at such elevated frequencies. In this dissertation, for the first time, system imperfections of millimeter wave communication links are related to the causative frontend non- ideality in a theoretical approach. The findings are verified by measure- ments. Furthermore, for the first time, outdoor transmission experiments across realistic distances unveiling the real potential of the proposed system solutions are shown.