201 citations · 1.2k across the 107 of their papers we have counts for
11 papers · 2 filters
On the Capacity of Partially Cognitive Radios
G. Chung, S. Sridharan, S. Vishwanath +1
This paper considers the problem of cognitive radios with partial-message information. Here, an interference channel setting is considered where one transmitter (the "cognitive" on…
Communicating the Difference of Correlated Gaussian Sources Over a MAC
Rajiv Soundararajan, Sriram Vishwanath
This paper considers the problem of transmitting the difference of two jointly Gaussian sources over a two-user additive Gaussian noise multiple access channel (MAC). The goal is t…
Channel Estimation and Linear Precoding in Multiuser Multiple-Antenna TDD Systems
Jubin Jose, Alexei Ashikhmin, Phil Whiting +1
Traditional approaches in the analysis of downlink systems decouple the precoding and the channel estimation problems. However, in cellular systems with mobile users, these two pro…
On the Capacity of One-sided Two user Gaussian Fading Broadcast Channels
Amin Jafarian, Sriram Vishwanath
In this paper, we investigate upper and lower bounds on the capacity of two-user fading broadcast channels where one of the users has a constant (non-fading) channel. We use the Co…
A Layered Lattice Coding Scheme for a Class of Three User Gaussian Interference Channels
Sriram Sridharan, Amin Jafarian, Sriram Vishwanath +2
The paper studies a class of three user Gaussian interference channels. A new layered lattice coding scheme is introduced as a transmission strategy. The use of lattice codes allow…
Capacity of Symmetric K-User Gaussian Very Strong Interference Channels
Sriram Sridharan, Amin Jafarian, Sriram Vishwanath +1
This paper studies a symmetric K user Gaussian interference channel with K transmitters and K receivers. A "very strong" interference regime is derived for this channel setup. A "v…
Communication Through Jamming over a Slotted ALOHA Channel
Sandeep Bhadra, Shreeshankar Bodas, Sanjay Shakkottai +1
This work derives bounds on the jamming capacity of a slotted ALOHA system. A system with n legitimate users, each with a Bernoulli arrival process is considered. Packets are tempo…
Relay-Assisted User Scheduling in Wireless Networks with Hybrid-ARQ
Caleb K. Lo, John J. Hasenbein, Sriram Vishwanath +1
This paper studies the problem of relay-assisted user scheduling for downlink wireless transmission. The base station or access point employs hybrid automatic-repeat-request (HARQ)…
An Energy-Based Comparison of Long-Hop and Short-Hop Routing in MIMO Networks
Caleb K. Lo, Sriram Vishwanath, Robert W. Heath
This paper considers the problem of selecting either routes that consist of long hops or routes that consist of short hops in a network of multiple-antenna nodes, where each transm…
Generalized Degrees of Freedom of the Symmetric Gaussian User Interference Channel
Syed A. Jafar, Sriram Vishwanath
We characterize the generalized degrees of freedom of the user symmetric Gaussian interference channel where all desired links have the same signal-to-noise ratio (SNR) and all…
Adaptive Sum Power Iterative Waterfilling for MIMO Cognitive Radio Channels
Rajiv Soundararajan, Sriram Vishwanath
In this paper, the sum capacity of the Gaussian Multiple Input Multiple Output (MIMO) Cognitive Radio Channel (MCC) is expressed as a convex problem with finite number of linear co…