@article{qi_sichitiu_2019, title={Physical Layer Performance of a Cooperative Amplify and Forward Scheme for MIMO WLANs}, volume={68}, ISSN={["1939-9359"]}, DOI={10.1109/TVT.2019.2916375}, abstractNote={This paper proposes a novel cooperative amplify and forward (CAF) architecture for MIMO WLANs to improve their coverage and transmission rates, without requiring any modifications in the IEEE 802.11 standards at the clients. System models are used for analyzing the physical layer of CAF networks, and compared with the conventional amplify-and-forward (AF) and decode-and-forward (DF) networks. Numerical results demonstrate that the CAF network clearly outperforms conventional 802.11 networks, and AF and DF networks in terms of coverage and throughput.}, number={7}, journal={IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY}, author={Qi, Yuepeng and Sichitiu, Mihail L.}, year={2019}, month={Jul}, pages={6709–6720} }
 @inproceedings{qi_yu_suh_jang_2015, title={GPS tethering for energy conservation}, DOI={10.1109/wcnc.2015.7127660}, abstractNote={Due to the low-speed GPS transmission and poor signal quality, localization is considered an expensive operation in battery-operated smartphones. This is even worse for apps that need a single location fix such as Foursquare and Flickr rather than continuous navigation because it cannot exploit the less-demanding “warm start” mode of GPS operation. This paper proposes GPS-Tether (GTR) which shares and reuses the known GPS coordinates among mobile devices in the proximity. Benefiting from unremitting Wifi discovery behaviors of smartphones, GTR does not need an additional protocol and does not disrupt operations of non-GTR clients. Experiments based on Samsung Galaxy smartphones and Monsoon Power Monitor show that GTR can extend smartphones battery usage as much as 19% compared to Assisted GPS (A-GPS). One important design goal is that it should require minimal changes for the implementation of GTR, which has been accomplished by incorporating the Wifi virtualization technique.}, booktitle={2015 ieee wireless communications and networking conference (wcnc)}, author={Qi, Y. P. and Yu, C. S. and Suh, Y. J. and Jang, S. Y.}, year={2015}, pages={1320–1325} }