S. Jafar

Publications
Influence

Interference Alignment and Degrees of Freedom of the $K$-User Interference Channel

V. Cadambe, S. Jafar
Computer Science, Mathematics
IEEE Transactions on Information Theory
3 July 2007

We have shown that with perfect channel knowledge the user interference channel has (almost surely) degrees of freedom when the channel coefficients are time-varying and are generated from a continuous distribution. Expand

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A Distributed Numerical Approach to Interference Alignment and Applications to Wireless Interference Networks

K. S. Gomadam, V. Cadambe, S. Jafar
Computer Science
IEEE Transactions on Information Theory
1 June 2011

In this work, we provide examples of iterative algorithms that utilize the reciprocity of wireless networks to achieve interference alignment with only local channel knowledge at each node. Expand

Approaching the Capacity of Wireless Networks through Distributed Interference Alignment

K. S. Gomadam, V. Cadambe, S. Jafar
Computer Science, Mathematics
IEEE GLOBECOM - IEEE Global Telecommunications…
26 March 2008

We provide examples of iterative algorithms that utilize the reciprocity of wireless networks to achieve interference alignment with only local channel knowledge at each node. Expand

Breaking Spectrum Gridlock With Cognitive Radios: An Information Theoretic Perspective

A. Goldsmith, S. Jafar, I. Marić, S. Srinivasa
Engineering, Computer Science
Proceedings of the IEEE
24 April 2009

This paper surveys the fundamental capacity limits and associated transmission techniques for different wireless network design paradigms based on this promising technology. Expand

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135
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Capacity limits of MIMO channels

A. Goldsmith, S. Jafar, N. Jindal, S. Vishwanath
Computer Science
IEEE J. Sel. Areas Commun.
11 June 2003

We provide an overview of the extensive results on the Shannon capacity of single-user and multiuser multiple-input multiple-output (MIMO) channels. Expand

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Interference Alignment and Spatial Degrees of Freedom for the K User Interference Channel

V. Cadambe, S. Jafar
Computer Science, Mathematics
IEEE International Conference on Communications
3 July 2007

We show that the sum capacity of the K user frequency selective (or time-varying) interference channel is C(SNR) = (K/2) log( SNR) +o(log(SNr)) meaning that the channel has a total of K/2 degrees of freedom per orthogonal time and frequency dimension. Expand

On Feasibility of Interference Alignment in MIMO Interference Networks

Cenk M. Yetis, Tiangao Gou, S. Jafar, A. H. Kayran
Computer Science, Mathematics
IEEE Transactions on Signal Processing
23 November 2009

We explore the feasibility of interference alignment in signal vector space-based only on beamforming-for K-user MIMO interference channels. Expand

Sum power iterative water-filling for multi-antenna Gaussian broadcast channels

N. Jindal, S. Jafar, S. Vishwanath, A. Goldsmith
Mathematics
Conference Record of the Thirty-Sixth Asilomar…
1 December 2002

We use a "duality" to transform this problem into a convex multiple access problem, and then obtain a simple and fast iterative algorithm that gives us the optimum transmission policies. Expand

The Capacity of Private Information Retrieval

H. Sun, S. Jafar
Computer Science, Mathematics
GLOBECOM
29 February 2016

In the private information retrieval (PIR) problem a user wishes to retrieve, as efficiently as possible, one out of $K$ messages from $N$ non-communicating databases while revealing nothing about the identity of the desired message index. Expand

Degrees of Freedom Region of the MIMO $X$ Channel

S. Jafar, S. Shamai
Mathematics, Computer Science
IEEE Transactions on Information Theory
21 July 2006

We provide achievability as well as converse results for the degrees of freedom region of a multiple-input multiple-output (MIMO) X channel, i.e., a system with two transmitters, two receivers, each equipped with multiple antennas, where independent messages need to be conveyed over fixed channels. Expand

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