| | 1 | = Directional Antenna Diversity for Mobile Devices: Characterizations and Solutions = |
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| | 3 | |
| | 4 | Authors: Ardalan Amiri Sani, Lin Zhong, and Ashutosh Sabharwal |
| | 5 | |
| | 6 | == Abstract == |
| | 7 | We report a first-of-its-kind realization of directional transmission for smartphone-like mobile devices using multiple passive directional antennas, supported by only one RF chain. The key is a multi-antenna system (MiDAS) and its antenna selection methods that judiciously select the right antenna for transmission. It is grounded by two measurement-driven studies regarding 1) how smartphones rotate during wireless usage in the field and 2) how orientation and rotation impact the performance of directional antennas under various propagation environments. |
| | 8 | |
| | 9 | We implement MiDAS and its antenna selection methods using the WARP platform. We evaluate the implementation using a computerized motor to rotate the prototype according to traces collected from smartphone users in the field. Our evaluation shows that MiDAS achieves a median of 3dB increase in link gain translates to 85% goodput improvement for a low SNR scenario. THe same gain translates to 51% transmit power reduction for a high SNR scenario. Compared to other methods in realizing directional communication, MiDAS does not require any changes to the network infrastructure, and is therefore suitable for immediate or near-future deployment. |
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| | 11 | == Citation == |
| | 12 | {{{ |
| | 13 | @article{Amiri Sani:2010, |
| | 14 | Author = {A. Amiri Sani, L. Zhong, and A. Sabharwal}, |
| | 15 | Booktitle = {Proceedings of MobiCom 2010}, |
| | 16 | Title = {Directional Antenna Diversity for Mobile Devices: Characterizations and Solutions}, |
| | 17 | Year = {2010}} |
| | 18 | }}} |
