The 60 GHz frequency band promises very high data rates -in the order of Gb/s -due to the availability of large amounts of bandwidth. High freespace path loss at the 60 GHz frequency band makes it necessary to employ beamforming capable directional antennas to confine signal power in the desired direction. When beamforming is used, the links are sensitive to misalignment in antenna directionality, due to the movement of devices. To identify and circumvent the misalignments, we propose to use motion sensors (i.e., accelerometer and gyroscope) which are already present in most modern mobile devices. By finding the extent of misaligned beams, corrective actions are carried out to reconfigure the antennas. Motion sensors in mobile devices provide means to estimate the extent of misalignments. We collected real data from motion sensors and steered the beams appropriately. The results from our study show that the sensors are capable of detecting the cause of the error as translational or rotational movements. Furthermore it is also shown that sensor data can be used to predict the next location of the user. This can be used to reconfigure the directional antenna to switch the antenna beam and hence avoid frequent link disruptions. This decreases the number of beam searches, thus lowering the MAC overhead.iv Preface During my Embedded Systems master I always tried to achieve a broad understanding in many topics related to embedded systems. My graduation project has been no different, it was yet another unexplored topic; wireless communications. This past year I worked not only on wireless communications, but also learnt the ups and downs of being on the forefront of academic research. The result of which is not only this M.Sc. thesis, but also two published papers at the IEEE Consumer Communications and Networking Conference (CCNC).
Abstract-Communication at mmWave frequencies has been the focus in the recent years. In this paper, we discuss standardization efforts in 60 GHz short range communication and the progress therein. We compare the available standards in terms of network architecture, medium access control mechanisms, physical layer techniques and several other features. Comparative analysis indicates that IEEE 802.11ad is likely to lead the shortrange indoor communication at 60 GHz. We bring to the fore resolved and unresolved issues pertaining to robust WLAN connectivity at 60 GHz. Further, we discuss the role of mmWave bands in 5G communication scenarios and highlight the further efforts required in terms of research and standardization.
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