Yu-Chih Tung

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In multiuser MIMO (MU-MIMO) networks, the optimal bit rate of a user is highly dynamic and changes from one packet to the next. This breaks traditional bit rate adaptation algorithms, which rely on recent history to predict the best bit rate for the next packet. To address this problem, we introduce TurboRate, a rate adaptation scheme for MU-MIMO LANs.(More)
Multiple-In-Multiple-Out (MIMO) offers great potential for increasing network capacity by exploiting spatial diversity with multiple antennas. Multiuser MIMO (MU-MIMO) further enables Access Points (APs) with multiple antennas to transmit multiple data streams concurrently to several clients. In MU-MIMO, clients need to estimate Channel State Information(More)
As mobile devices have become more powerful and ubiquitous in our daily life, sharing content objects among mobile platforms has become increasingly popular. Without the help of server infrastructures, clients usually form a mobile peer-to-peer (P2P) system as an ad-hoc network, and discover content objects by flooding query to neighboring peers. Such a(More)
We propose a novel mobile system, called EchoTag, that enables phones to tag and remember indoor locations without requiring any additional sensors or pre-installed infrastructure. The main idea behind EchoTag is to actively generate acoustic signatures by transmitting a sound signal with a phone's speakers and sensing its reflections with the phone's(More)
ForcePhone is a novel system that enables commodity phones to recognize the force applied to their touch screen and body. Researchers have shown the usefulness and importance of this expressive input interface (especially for the one-hand operation), but this advanced function has not yet been realized and deployed in most state-of-the-art smartphones.(More)
Peer-to-Peer (P2P) storage systems are cost-effective and reliable platforms that enable users to share their storage to support variant emerging applications, such as peer-to-peer social networks and distributed backup systems. Because different users have heterogeneous online characteristics and bandwidth capabilities, how to replicate data at suitable(More)
To enhance the input capability on the severely limited space of a phone's screen, touch force has been a vital way to expand user-phone interactions. For example, users can get an options menu by hard-pressing a button or can surf the previous webpage by squeezing the phone. Researchers have shown the usefulness and importance of this expressive input(More)
Charging mobile devices fast alleviates users' impatience in waiting for their devices to be charged. So, fast charging has been the focus of both industry and academia, developing and deploying various technologies, such as Quick Charge by Qualcomm, TurboPower by Motorola, Flash Charge by OPPO, etc. Fast charging, unfortunately, accelerates the capacity(More)