To facilitate collaboration in massive online classrooms, instructors must make many decisions. For instance, the following parameters need to be decided when designing a peer-feedback system where students review each others’ essays: the number of students each student must provide feedback to, an algorithm to map feedback providers to receivers, constraints that ensure students do not become ...

In this work we first describe an asynchronous-feedback model which corresponds to the diverse roundtrip times (RTTs) of competing flows within the same communication channel. We show that even when the feedback of the receivers/network is asynchronous, the duration of a congestion epoch represents ‘common knowledge’ for the competing flows. Based on this property, we propose a diverse linear i...

Abstract The setup of thesis circles at the exit level undergraduate programs expects students to co-supervise each other’s work and multiple peer feedback is used replace supervisor formative feedback. Integrating requires be able make evaluative judgements by identifying relation patterns among different givers a reasoned decision for improving their own work. Unfortunately, most find it diff...

We apply linear network coding (LNC) to broadcast a block of data packets from one sender to a set of receivers via lossy wireless channels, assuming each receiver already possesses a subset of these packets and wants the rest. We aim to characterize the average packet decoding delay (APDD), which reflects how soon each individual data packet can be decoded by each receiver on average, and to m...

IP multicast is becoming the emerging infrastructure for mass delivery of information, from streaming audio and video media to multi-player games, software distributions and shared whiteboards. There have been several proposals to expand the basic unreliable service so that it can provide reliable delivery of data, in terms of ordering and loss recovery. Some of these proposals do not scale wel...

Uplink communication in a cellular radio network is considered where the base station in each cell employs linear or nonlinear (decision feedback) multiuser receivers. For any such receiver, the problem of interest is that of minimizing the total transmit power under the constraint that all the users of the network achieve their quality-of-service objective in terms of signal-to-interference ra...

An increasing number of applications, such as distributed interactive simulation, live auctions, distributed games and collaborative systems, require the network to provide a reliable multicast service. This service enables one sender to reliably transmit data to multiple receivers. Reliability is traditionally achieved by having receivers send negative acknowledgments (NACKs) to request from t...

In this paper, we study the impact of channel output feedback architectures on the capacity of two-user interference channel. For a two-user interference channel, a feedback link can exist between receivers and transmitters in 9 canonical architectures, ranging from only one feedback link to four-feedback links. We derive exact capacity region for the deterministic interference channel and cons...

The point-to-multipoint ABR service within ATM is important for many emerging data applications. The objective is for the source to operate at a rate representing its max-min fair share over the bottleneck link in the mul-ticast tree over which the connection is established. Resource Management (RM) cells are used by receivers to convey back to the source an explicit rate indicating their bandw...

New requirements on optical receivers are being driven by the rapid expansion of optical communications beyond traditional fiber-optic links. This thesis discusses the design of transimpedance amplifiers that are used in the preamplifier stage of optical receivers. The three specific requirements that are addressed here are a wide dynamic range, ambient light rejection, and low-voltage operatio...