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Christina Fragouli

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Publications associées (178)

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Information Flow Decomposition for Network Coding

Christina Fragouli, Emina Soljanin

The famous min-cut, max-flow theorem states that a source node can send a commodity through a network to a sink node at the rate determined by the flow of the min-cut separating the source and the sink. Recently it has been shown that by linear re-encoding ...

2004

Decentralized Network Coding

Christina Fragouli, Emina Soljanin

This paper proposes deterministic algorithms for decentralized network coding. Decentralized coding allows to locally specify the coding operations at network nodes without knowledge of the overall network topology, and to accommodate future changes in the ...

2004

A Connection between Network Coding and Convolutional Codes

Christina Fragouli, Emina Soljanin

The min-cut, max-flow theorem states that a source node can send a commodity through a network to a sink node at the rate determined by the flow of the min-cut separating the source and the sink. Recently it has been shown that by liner re-encoding at node ...

2004

On Average Throughput Benefits for Network Coding

Christina Fragouli, Emina Soljanin

We calculate the average throughput benefit that network coding can offer as compared to routing for different classes of multicast configurations over directed graphs. The averaging is over the throughput each individual receiver experiences. For the case ...

2004

Network coding as a coloring problem (Invited paper)

Mohammad Amin Shokrollahi, Christina Fragouli, Emina Soljanin

We consider a multicast configuration with two sources, and translate the network code design problem to vertex coloring of an appropriately defined graph. This observation enables to derive code design algorithms and alphabet size bounds, as well as estab ...

2004

On the Throughput of Ad-Hoc Networks using Connectivity Graphs

Christina Fragouli

In this paper we propose a set of necessary and sufficient conditions under which the throughput in an ad-hoc network can remain constant as the number of nodes n increases. Throughput refers to the minimum achievable rate between a source-destination pair ...

2004

Processing along the way: forwarding vs. coding

Christina Fragouli

We consider a source that transmits to a receiver by routing the information packets over a communication network and examine rate benefits that finite complexity processing at the intermediate nodes may offer. We show that the processing capabilities of t ...

2004

Training-Based Channel Estimation for Multiple Antenna Broadband Transmissions

Christina Fragouli

This paper addresses the problem of training sequence design for multiple-antenna transmissions over quasi-static frequency-selective channels. To achieve the channel estimation minimum mean square error, the training sequences transmitted from the multipl ...

2003

How to choose the number of taps in a DFE?

Christina Fragouli

In this paper, we address the following problem. Given a fixed total number of feedforward and feedback filter taps in a decision feedback equalizer, what is the optimum number of taps of each filter and what is the optimum delay setting? We propose a simp ...

2002

Multi-input multi-output fading channel tracking and equalization using Kalman estimation

Ali H. Sayed, Christina Fragouli

This paper addresses the problem of channel tracking and equalization for multi-input multi-output (MIMO) time-varying frequency-selective channels. These channels model the effects of inter-symbol interference (ISI), co-channel interference (CCI), and noi ...

Institute of Electrical and Electronics Engineers2002