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• W2939743635 abstract "The demand for higher mobile data rates and data volumes has been increased during the recent years. Decreasing prices made many from the wired internet known applications also available on mobile devices. In 2000 the price for 1 Mega Byte (MB) data was more than one euro, in 2018 the price has changed to a fraction of a cent. This makes it possible to transmit higher data volumes mobile, for example movies in High Definition (HD) or even Ultra High Definition (UHD). Also new applications like Virtual Reality (VR) are possible.To provide these higher data rates and data volumes, more bandwidth is required.Nowadays the mobile communication is in the frequency range from 700 MHz to approximately 3 GHz. Even the Digital Video Broadcast (DVB) frequencies have been shifted to provide more bandwidth for the mobile communication.The millimeter Wave (mmW) region supports large and consecutive regions of unused spectrum, which can be used for the mobile communication. Newest developments make it possible to generate and handle frequencies up to 100 GHz. Therefore the interest in mmW has increased.In the recent history, the size of the wavelength was comparable large to the size of the mobile device. With the introduction of mmW, this has changed dramatically. Even a mobile phone has the size of multiple wavelength, which also leads to smaller antennas. In the mobile communication standards up to the 4th Generation (4G), the mobile phone radiates with approximately the same power into every direction. Therefore, the mobile phone has been modeled as a single rotation invariant point, which is not possible in mmW. Regarding to the size of the phone, the phone shields the radiation into some directions, which leads to holes in the spatial coverage. For reliable link level simulation results, this has to be also taken into account, which leads to a 3D modeling of the system. Furthermore, multiple antennas are required to archive a full spherical coverage and therefore the coverage becomes an important performance indicator.The regarding to the wavelength shrinking antennas don’t have only disadvantages.They also offer more efficient antenna systems and also the implementation of antenna arrays on mobile phones is possible. Antenna arrays allow it to steer the radiation into a certain direction. Therefore the regarding to the mmW occurring higher losses can be balanced. To save power and computational effort, the beamforming is done in the analogue domain. This requires a reliable algorithm for the determination of the spatial direction of arrival. The correct estimation of the direction of arrival is the key and also the most challenging task in mmW beamforming. In mmW beamforming only one direction can be measured at the same time. Therefore an elaborate search order has to be chosen.A full end-to-end simulation system is provided in this thesis, including a 3D channel model, which considers all described aspects. Especially the antenna configuration of the phone is explained in detail." @default.
• W2939743635 created "2019-04-25" @default.
• W2939743635 creator A5035762646 @default.
• W2939743635 date "2018-01-01" @default.
• W2939743635 modified "2023-09-25" @default.
• W2939743635 title "Millimeter wave direction of arrival estimation and UE beamforming in a 3D environment" @default.
• W2939743635 doi "https://doi.org/10.17185/duepublico/70007" @default.
• W2939743635 hasPublicationYear "2018" @default.
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