Still searching Arxiv, refresh for possibly better results.
Results for "Jeffrey G. Andrews"
total 128962took 0.13s
Transmission capacity of wireless networksJan 03 2012Transmission capacity (TC) is a performance metric for wireless networks that measures the spatial intensity of successful transmissions per unit area, subject to a constraint on the permissible outage probability (where outage occurs when the SINR at ... More Spectrum Allocation in Two-Tier NetworksMay 08 2008Nov 24 2008Two-tier networks, comprising a conventional cellular network overlaid with shorter range hotspots (e.g. femtocells, distributed antennas, or wired relays), offer an economically viable way to improve cellular system capacity. The capacity-limiting factor ... More Coverage in Multi-Antenna Two-Tier NetworksFeb 18 2009May 04 2009In two-tier networks -- comprising a conventional cellular network overlaid with shorter range hotspots (e.g. femtocells, distributed antennas, or wired relays) -- with universal frequency reuse, the near-far effect from cross-tier interference creates ... More Bandwidth Partitioning in Decentralized Wireless NetworksNov 02 2007Apr 02 2008This paper addresses the following question, which is of interest in the design of a multiuser decentralized network. Given a total system bandwidth of W Hz and a fixed data rate constraint of R bps for each transmission, how many frequency slots N of ... More Fractional Power Control for Decentralized Wireless NetworksJul 03 2007Apr 28 2008We consider a new approach to power control in decentralized wireless networks, termed fractional power control (FPC). Transmission power is chosen as the current channel quality raised to an exponent -s, where s is a constant between 0 and 1. The choices ... More Open vs Closed Access Femtocells in the UplinkFeb 15 2010Femtocells are assuming an increasingly important role in the coverage and capacity of cellular networks. In contrast to existing cellular systems, femtocells are end-user deployed and controlled, randomly located, and rely on third party backhaul (e.g. ... More On the Role of Mobility for Multi-message GossipApr 13 2012Feb 07 2013We consider information dissemination in a large $n$-user wireless network in which $k$ users wish to share a unique message with all other users. Each of the $n$ users only has knowledge of its own contents and state information; this corresponds to ... More An overview of the transmission capacity of wireless networksAug 29 2008Mar 30 2010This paper surveys and unifies a number of recent contributions that have collectively developed a metric for decentralized wireless network analysis known as transmission capacity. Although it is notoriously difficult to derive general end-to-end capacity ... More On Association Cells in Random Heterogeneous NetworksOct 04 2013Characterizing user to access point (AP) association strategies in heterogeneous cellular networks (HetNets) is critical for their performance analysis, as it directly influences the load across the network. In this letter, we introduce and analyze a ... More Transmission Capacity of Ad Hoc Networks with Spatial DiversityFeb 08 2007Aug 11 2008This paper derives the outage probability and transmission capacity of ad hoc wireless networks with nodes employing multiple antenna diversity techniques, for a general class of signal distributions. This analysis allows system performance to be quantified ... More An Overview on 3GPP Device-to-Device Proximity ServicesOct 01 2013Device-to-device (D2D) communication will likely be added to LTE in 3GPP Release 12. In principle, exploiting direct communication between nearby mobile devices will improve spectrum utilization, overall throughput, and energy consumption, while enabling ... More A Tractable Approach to Coverage and Rate in Cellular NetworksSep 02 2010Feb 21 2011Cellular networks are usually modeled by placing the base stations on a grid, with mobile users either randomly scattered or placed deterministically. These models have been used extensively but suffer from being both highly idealized and not very tractable, ... More Limited Feedback Beamforming Over Temporally-Correlated ChannelsJun 06 2006May 02 2008Feedback of quantized channel state information (CSI), called limited feedback, enables transmit beamforming in multiple-input-multiple-output (MIMO) wireless systems with a small amount of overhead. Due to its efficiency, beamforming with limited feedback ... More A Primer on Cellular Network Analysis Using Stochastic GeometryApr 12 2016Oct 05 2016This tutorial is intended as an accessible but rigorous first reference for someone interested in learning how to model and analyze cellular network performance using stochastic geometry. In particular, we focus on computing the signal-to-interference-plus-noise ... More Series Expansion for Interference in Wireless NetworksJan 20 2011The spatial correlations in transmitter node locations introduced by common multiple access protocols makes the analysis of interference, outage, and other related metrics in a wireless network extremely difficult. Most works therefore assume that nodes ... More Random Access Transport CapacitySep 28 2009We develop a new metric for quantifying end-to-end throughput in multihop wireless networks, which we term random access transport capacity, since the interference model presumes uncoordinated transmissions. The metric quantifies the average maximum rate ... More Fundamental Limits of CooperationMar 30 2012Cooperation is viewed as a key ingredient for interference management in wireless systems. This paper shows that cooperation has fundamental limitations. The main result is that even full cooperation between transmitters cannot in general change an interference-limited ... More Open, Closed, and Shared Access Femtocells in the DownlinkSep 17 2010A fundamental choice in femtocell deployments is the set of users which are allowed to access each femtocell. Closed access restricts the set to specifically registered users, while open access allows any mobile subscriber to use any femtocell. Which ... More Macro diversity in Cellular Networks with Random BlockagesJan 09 2017Blocking objects (blockages) between a transmitter and receiver cause wireless communication links to transition from line-of-sight (LOS) to non-line-of-sight (NLOS) propagation, which can greatly reduce the received power, particularly at higher frequencies ... More The Interplay between Massive MIMO and Underlaid D2D NetworkingSep 09 2014Jan 28 2015In a device-to-device (D2D) underlaid cellular network, the uplink spectrum is reused by the D2D transmissions, causing mutual interference with the ongoing cellular transmissions. Massive MIMO is appealing in such a context as the base station's (BS's) ... More User Arrival in MIMO Interference Alignment NetworksJun 26 2011In this paper we analyze a constant multiple-input multiple-output interference channel where a set of active users are cooperating through interference alignment while a set of secondary users desire access to the channel. We derive the minimum number ... More Should the democrats move to the left on economic policy?Jul 25 2008Dec 09 2013Could John Kerry have gained votes in the 2004 Presidential election by more clearly distinguishing himself from George Bush on economic policy? At first thought, the logic of political preferences would suggest not: the Republicans are to the right of ... More Power Control in Two-Tier Femtocell NetworksOct 21 2008May 13 2009In a two tier cellular network -- comprised of a central macrocell underlaid with shorter range femtocell hotspots -- cross-tier interference limits overall capacity with universal frequency reuse. To quantify near-far effects with universal frequency ... More Spatial search and the Dirac equationMay 20 2004We consider the problem of searching a d-dimensional lattice of N sites for a single marked location. We present a Hamiltonian that solves this problem in time of order sqrt(N) for d>2 and of order sqrt(N) log(N) in the critical dimension d=2. This improves ... More