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Single frequency networks (SFN) in combination with a multi-carrier transmission scheme such as OFDM are often proposed as a means to provide continuous coverage of broadcast applications over a large area. In this paper, we propose a distributed beam-forming algorithm that makes use of channel state information fed back by receivers to improve the performance of the weaker connections. The distributed...
Single frequency networks (SFN) in combination with a multi-carrier transmission scheme such as OFDM are often proposed as a means to provide continuous coverage of broadcast applications over a large area. While this combination does succeed in providing continuous coverage, it has certain limitations. Specifically, at points where signals from multiple base-stations are received, the overall signal-to-noise...
In this paper, we address the problem of fault diagnosis using multicast-based probing. Specifically, we introduce a disjunctive fault model for multicast-based probing wherein a receiver probe records a faulty measurement if and only if at least one of its ancestor nodes is in a faulty state. Using this fault model, we derive key results concerning the most probable fault scenario and the most likely...
Streaming media over wireless networks typically rely on end-to-end feedback from client devices to help media servers adjust to changing channel conditions. In rapidly fluctuating channel conditions, the client device may not be able to effectively track changes and report them to the server. Furthermore, bandwidth constraints often limit the frequency of end-to-end feedback. In order to overcome...
We study a variant of the multi-dimensional Erlang blocking model in which customer arrivals require multiple servers and are modelled as batched Poisson processes with arbitrary batch size distribution. We show that the state distribution for the partial batch blocking discipline is a product form, and for the special case of the complete sharing policy, we obtain a one-dimensional recursion for...
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