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- Hua Sun, Syed Ali Jafar
- IEEE Transactions on Information Theory
- 2016

In the private information retrieval (PIR) problem, a user wishes to retrieve, as efficiently as possible, one out of <inline-formula> <tex-math notation="LaTeX">$K$ </tex-math></inline-formula> messages from <inline-formula> <tex-math notation="LaTeX">$N$ </tex-math></inline-formula> non-communicating databases (each holds all <inline-formula> <tex-math… (More)

- Chenwei Wang, Hua Sun, Syed Ali Jafar
- 2012 IEEE International Symposium on Information…
- 2012

We explore the degrees of freedom (DoF) of the K >; 3 user M<sub>T</sub> × M<sub>R</sub> MIMO Gaussian interference channel where each transmitter is equipped with M<sub>T</sub> and each receiver is equipped with M<sub>R</sub> antennas. Expressing the DoF characterization as a function of the ratio γ = M/N, where M = min(M<sub>T</sub>,… (More)

- Hua Sun, Syed Ali Jafar
- ArXiv
- 2016

Private information retrieval (PIR) is the problem of retrieving as efficiently as possible, one out of K messages from N non-communicating replicated databases (each holds all K messages) while keeping the identity of the desired message index a secret from each individual database. The information theoretic capacity of PIR (equivalently, the reciprocal of… (More)

- Hua Sun, Chunhua Geng, Tiangao Gou, Syed Ali Jafar
- 2012 IEEE International Symposium on Information…
- 2012

We show that an M × N user MIMO X network with A antennas at each node has A (MN/M+N-1) degrees of freedom (DoF), thus settling the spatial scale invariance conjecture (scaling the number of antennas at each node by a constant factor will scale the total DoF by the same factor) for this class of networks. The previously known best general DoF inner… (More)

- Hua Sun, Lynn E Dobrunz
- The Journal of neuroscience : the official…
- 2006

Target cell-specific differences in short-term plasticity have been attributed to differences in the initial release probability of synapses. Using GIN (GFP-expressing inhibitory neurons) transgenic mice that express enhanced green fluorescent protein (EGFP) in a subset of interneurons containing somatostatin, we show that Schaffer collateral synapses onto… (More)

- Hua Sun, Susan A. Lyons, Lynn E Dobrunz
- The Journal of physiology
- 2005

Although it is presynaptic, short-term plasticity has been shown at some synapses to depend upon the postsynaptic cell type. Previous studies have reported conflicting results as to whether Schaffer collateral axons have target-cell specific short-term plasticity. Here we investigate in detail the short-term dynamics of Schaffer collateral excitatory… (More)

- Hua Sun, Chunhua Geng, Syed Ali Jafar
- 2013 IEEE International Symposium on Information…
- 2013

The topological interference management problem refers to the study of the capacity of partially connected linear (wired and wireless) communication networks with no channel state information at the transmitters (no CSIT) beyond the network topology, i.e., a knowledge of which channel coefficients are zero (weaker than the noise floor in the wireless case).… (More)

- Hua Sun, Syed Ali Jafar
- 2017 IEEE International Symposium on Information…
- 2017

A (K, N, T, Kc) instance of the MDS-TPIR problem is comprised of K messages and N distributed servers. Each message is separately encoded through an (N, K<inf>c</inf>) MDS storage code. A user wishes to retrieve one message, as efficiently as possible, while revealing no information about the desired message index to any colluding set of up to T servers.… (More)

- Hua Sun, Aundrea F Bartley, Lynn E Dobrunz
- Journal of neurophysiology
- 2009

Schaffer collateral synapses in hippocampus show target-cell specific short-term plasticity. Using GFP-expressing Inhibitory Neuron (GIN) transgenic mice that express enhanced green fluorescent protein (EGFP) in a subset of somatostatin-containing interneurons (SOM interneurons), we previously showed that Schaffer collateral synapses onto SOM interneurons… (More)

- Hua Sun, Syed Ali Jafar
- GLOBECOM Workshops
- 2016

Private information retrieval (PIR) is the problem of retrieving as efficiently as possible, one out of K messages from N non-communicating replicated databases (each holds all K messages) while keeping the identity of the desired message index a secret from each individual database. Symmetric PIR (SPIR) is a generalization of PIR to include the requirement… (More)