Spatial averages of coverage characteristics in large CDMA networks
Wireless Networks
Spectrum sensing in cognitive radio networks: the cooperation-processing tradeoff
Wireless Communications & Mobile Computing - Cognitive Radio, Software Defined Radio And Adaptive Wireless Systems
Geometry and random graphs for the analysis and design of wireless networks
IEEE Journal on Selected Areas in Communications - Special issue on stochastic geometry and random graphs for the analysis and designof wireless networks
Spectrum sharing between cellular and mobile ad hoc networks: transmission-capacity trade-off
IEEE Journal on Selected Areas in Communications - Special issue on stochastic geometry and random graphs for the analysis and designof wireless networks
Uplink capacity and interference avoidance for two-tier femtocell networks
IEEE Transactions on Wireless Communications
Power control in two-tier femtocell networks
IEEE Transactions on Wireless Communications
Soft handoff and uplink capacity in a two-tier CDMA system
IEEE Transactions on Wireless Communications
Sensing-Throughput Tradeoff for Cognitive Radio Networks
IEEE Transactions on Wireless Communications
Transmission capacity of ad hoc networks with spatial diversity
IEEE Transactions on Wireless Communications - Part 1
An Aloha protocol for multihop mobile wireless networks
IEEE Transactions on Information Theory
On optimal design of multitier wireless cellular systems
IEEE Communications Magazine
IEEE Communications Magazine
IEEE Journal on Selected Areas in Communications
Coverage in tiered cellular networks with spatial diversity
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Performance analysis of two-tier femtocell networks with outage constraints
IEEE Transactions on Wireless Communications
Beam subset selection strategy for interference reduction in two-tier femtocell networks
IEEE Transactions on Wireless Communications
Computers and Electrical Engineering
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In 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 dead spots where reliable coverage cannot be guaranteed to users in either tier. Equipping the macrocell and femtocells with multiple antennas enhances robustness against the near-far problem. This work derives the maximum number of simultaneously transmitting multiple antenna femtocells meeting a per-tier outage probability constraint. Coverage dead zones are presented wherein cross-tier interference bottlenecks cellular and femtocell coverage. Two operating regimes are shown namely 1) a cellular-limited regime in which femtocell users experience unacceptable cross-tier interference and 2) a hotspot-limited regime wherein both femtocell users and cellular users are limited by hotspot interference. Our analysis accounts for the per-tier transmit powers, the number of transmit antennas (single antenna transmission being a special case) and terrestrial propagation such as the Rayleigh fading and the path loss exponents. Single-user (SU) multiple antenna transmission at each tier is shown to provide significantly superior coverage and spatial reuse relative to multiuser (MU) transmission. We propose a decentralized carrier-sensing approach to regulate femtocell transmission powers based on their location. Considering a worst-case cell-edge location, simulations using typical path loss scenarios show that our interference management strategy provides reliable cellular coverage with about 60 femtocells per cell-site.