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- Arash Gholami Davoodi, Syed Ali Jafar
- IEEE Transactions on Information Theory
- 2014

A conjecture made by Lapidoth et al. at Allerton 2005 (also an open problem presented at ITA 2006) states that the degrees of freedom (DoF) of a two user broadcast channel, where the transmitter is equipped with two antennas and each user is equipped with one antenna, must collapse under finite precision channel state information at the transmitter (CSIT).… (More)

- Arash Gholami Davoodi, Syed Ali Jafar
- ArXiv
- 2014

A conjecture made by Lapidoth, Shamai and Wigger at Allerton 2005 (also an open problem presented at ITA 2006) states that the degrees of freedom (DoF) of a two user broadcast channel, where the transmitter is equipped with 2 antennas and each user is equipped with 1 antenna, must collapse under finite precision channel state information at the transmitter… (More)

- Arash Gholami Davoodi, Syed Ali Jafar
- ArXiv
- 2016

We characterize the sum GDoF of the K user symmetric MISO BC where the direct channels have strengths ∼ SNR, cross channels have strengths ∼ SNR, and the channel estimation error terms have strengths ∼ SNR. This is a step towards the ultimate goal of unifying recent advances which focus exclusively on either the diversity of channel strengths (α) or the… (More)

- Arash Gholami Davoodi, Mohammad Javad Emadi, Mohammad Reza Aref
- 2013 Iran Workshop on Communication and…
- 2013

For a Rayleigh fading full-duplex decode-and-forward relay channel, we analytically derive optimum power allocation schemes subject to individual power constraints for the source and the relay. The optimization problem is taken over the source power and the relay power. It is proven that the optimization problem is concave for this scenario, and optimum… (More)

- Arash Gholami Davoodi, Syed Ali Jafar
- 2016 IEEE International Symposium on Information…
- 2016

This work bridges the gap between sharply contrasting results on the degrees of freedom of the K user broadcast channel where the transmitter is equipped with K transmit antennas and each of the K receivers is equipped with a single antenna. This channel has K DoF when channel state information at the transmitter (CSIT) is perfect, but as shown recently, it… (More)

- Arash Gholami Davoodi, Syed Ali Jafar
- 2017 IEEE International Symposium on Information…
- 2017

We present sum-set inequalities specialized to the generalized degrees of freedom (GDoF) framework. These are information theoretic lower bounds on the entropy of bounded density linear combinations of discrete, power-limited dependent random variables in terms of the joint entropies of arbitrary linear combinations of new random variables that are obtained… (More)

- Arash Gholami Davoodi, Syed Ali Jafar
- ArXiv
- 2017

The generalized degrees of freedom (GDoF) of the two user symmetric multiple input multiple output (MIMO) interference channel (IC) are characterized as a function of the channel strength levels and the level of channel state information at the transmitters (CSIT). In this symmetric setting, each transmitter is equipped with M antennas, each receiver is… (More)

- Mohammad Farzad Pourbabaee, Mohammad Javad Emadi, Arash Gholami Davoodi, Mohammad Reza Aref
- 2012 IEEE Information Theory Workshop
- 2012

In this paper, lattice based coding is used over two-user Gaussian state-dependent multiple access channel with common message for two channel models. First, it is assumed that the additive channel interference is noncausally known at both encoders. Exploiting a lattice encoding and decoding scheme, the effect of the interference is completely removed and… (More)

- Arash Gholami Davoodi, Syed Ali Jafar
- ArXiv
- 2017

This work obtains the first bound that is provably sensitive to network coherence time, i.e., coherence time in an interference network where all channels experience the same coherence patterns. This is accomplished by a novel adaptation of the aligned image sets bound, and settles various open problems noted previously by Naderi and Avestimehr and by Gou… (More)

Abstract—In this paper optimum power allocations are derived for a fading decode-and-forward full-duplex relay channel, analytically. Individual power constraints for the source and the relay are assumed and the related optimization problem is analyzed for two scenarios. First, optimization is taken over the source power, the relay power, and the… (More)