154 citations · 1.1k across the 40 of their papers we have counts for
25 papers · 1 filter
Adaptive Sampling of RF Fingerprints for Fine-grained Indoor Localization
Xiao-Yang Liu, Shuchin Aeron, Vaneet Aggarwal +2
Indoor localization is a supporting technology for a broadening range of pervasive wireless applications. One promis- ing approach is to locate users with radio frequency fingerpri…
Does -minimization outperform -minimization?
Le Zheng, Arian Maleki, Haolei Weng +2
In many application areas we are faced with the following question: Can we recover a sparse vector from its undersampled set of noisy observations $y \in \ma…
On the Capacity Regions of Two-Way Diamond Channels
Mehdi Ashraphijuo, Vaneet Aggarwal, Xiaodong Wang
In this paper, we study the capacity regions of two-way diamond channels. We show that for a linear deterministic model the capacity of the diamond channel in each direction can be…
Multiuser Joint Energy-Bandwidth Allocation with Energy Harvesting - Part II: Multiple Broadcast Channels & Proportional Fairness
Zhe Wang, Vaneet Aggarwal, Xiaodong Wang
In this paper, we consider the energy-bandwidth allocation for a network with multiple broadcast channels, where the transmitters access the network orthogonally on the assigned fr…
Multiuser Joint Energy-Bandwidth Allocation with Energy Harvesting - Part I: Optimum Algorithm & Multiple Point-to-Point Channels
Zhe Wang, Vaneet Aggarwal, Xiaodong Wang
In this paper, we develop optimal energy-bandwidth allocation algorithms in fading channels for multiple energy harvesting transmitters, each may communicate with multiple receiver…
Resource Allocation for Power Minimization in the Downlink of THP-based Spatial Multiplexing MIMO-OFDMA Systems
Marco Moretti, Luca Sanguinetti, Xiaodong Wang
In this work, we deal with resource allocation in the downlink of spatial multiplexing MIMO-OFDMA systems. In particular, we concentrate on the problem of jointly optimizing the tr…
On the Symmetric -user Interference Channels with Limited Feedback
Mehdi Ashraphijuo, Vaneet Aggarwal, Xiaodong Wang
In this paper, we develop achievability schemes for symmetric -user interference channels with a rate-limited feedback from each receiver to the corresponding transmitter. We st…
Sequential Joint Spectrum Sensing and Channel Estimation for Dynamic Spectrum Access
Yasin Yilmaz, Ziyu Guo, Xiaodong Wang
Dynamic spectrum access under channel uncertainties is considered. With the goal of maximizing the secondary user (SU) throughput subject to constraints on the primary user (PU) ou…
Power Allocation for Energy Harvesting Transmitter with Causal Information
Zhe Wang, Vaneet Aggarwal, Xiaodong Wang
We consider power allocation for an access-controlled transmitter with energy harvesting capability based on causal observations of the channel fading state. We assume that the sys…
Iterative Dynamic Water-filling for Fading Multiple-Access Channels with Energy Harvesting
Zhe Wang, Vaneet Aggarwal, Xiaodong Wang
In this paper, we develop optimal energy scheduling algorithms for -user fading multiple-access channels with energy harvesting to maximize the channel sum-rate, assuming that t…
Massive MIMO Multicasting in Noncooperative Cellular Networks
Zhengzheng Xiang, Meixia Tao, Xiaodong Wang
We study the massive multiple-input multiple-output (MIMO) multicast transmission in cellular networks where each base station (BS) is equipped with a large-scale antenna array and…
On the Capacity and Degrees of Freedom Regions of MIMO Interference Channels with Limited Receiver Cooperation
Mehdi Ashraphijuo, Vaneet Aggarwal, Xiaodong Wang
This paper gives the approximate capacity region of a two-user MIMO interference channel with limited receiver cooperation, where the gap between the inner and outer bounds is in t…
Hybrid Group Decoding for Scalable Video over MIMO-OFDM Downlink Systems
Shuying Li, Chen Gong, Xiaodong Wang
We propose a scalable video broadcasting scheme over MIMO-OFDM systems. The scalable video source layers are channel encoded and modulated into independent signal streams, which ar…
On Finite Block-Length Quantization Distortion
Chen Gong, Xiaodong Wang
We investigate the upper and lower bounds on the quantization distortions for independent and identically distributed sources in the finite block-length regime. Based on the convex…
On the Capacity Region and the Generalized Degrees of Freedom Region for the MIMO Interference Channel with Feedback
Mehdi Ashraphijuo, Vaneet Aggarwal, Xiaodong Wang
In this paper, we study the effect of feedback on two-user MIMO interference channels. The capacity region of MIMO interference channels with feedback is characterized within a con…
Degrees of Freedom for MIMO Two-Way X Relay Channel
Zhengzheng Xiang, Meixia Tao, Jianhua Mo +1
We study the degrees of freedom (DOF) of a multiple-input multiple-output (MIMO) two-way X relay channel, where there are two groups of source nodes and one relay node, each equipp…
Pricing-based Distributed Downlink Beamforming in Multi-Cell OFDMA Networks
Weiqiang Xu, Xiaodong Wang
We address the problem of downlink beamforming for mitigating the co-channel interference in multi-cell OFDMA networks. Based on the network utility maximization framework, we form…
Adaptive Sensing of Congested Spectrum Bands
Ali Tajer, Rui M. Castro, Xiaodong Wang
Cognitive radios process their sensed information collectively in order to opportunistically identify and access under-utilized spectrum segments (spectrum holes). Due to the trans…
Information Exchange Limits in Cooperative MIMO Networks
Ali Tajer, Xiaodong Wang
Concurrent presence of inter-cell and intra-cell interferences constitutes a major impediment to reliable downlink transmission in multi-cell multiuser networks. Harnessing such in…
Robust Linear Precoder Design for Multi-cell Downlink Transmission
Ali Tajer, Narayan Prasad, Xiaodong Wang
Coordinated information processing by the base stations of multi-cell wireless networks enhances the overall quality of communication in the network. Such coordinations for optimiz…
Superimposed XOR: Approaching Capacity Bounds of the Two-Way Relay Channels
Jianquan Liu, Meixia Tao, Youyun Xu +1
In two-way relay channels, bitwise XOR and symbol-level superposition coding are two popular network-coding based relaying schemes. However, neither of them can approach the capaci…
(n,K)-user Interference Channels: Degrees of Freedom
Ali Tajer, Xiaodong Wang
We analyze the gains of opportunistic communication in multiuser interference channels. Consider a fully connected -user Gaussian interference channel. At each time instance onl…
Multiuser Diversity Gain in Cognitive Networks
Ali Tajer, Xiaodong Wang
Dynamic allocation of resources to the \emph{best} link in large multiuser networks offers considerable improvement in spectral efficiency. This gain, often referred to as \emph{mu…
Beamforming and Rate Allocation in MISO Cognitive Radio Networks
Ali Tajer, Narayan Prasad, Xiaodong Wang
We consider decentralized multi-antenna cognitive radio networks where secondary (cognitive) users are granted simultaneous spectrum access along with license-holding (primary) use…