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FOCS
2008
IEEE
16 years 29 days ago
Submodular Approximation: Sampling-based Algorithms and Lower Bounds
We introduce several generalizations of classical computer science problems obtained by replacing simpler objective functions with general submodular functions. The new problems i...
Zoya Svitkina, Lisa Fleischer
GLOBECOM
2008
IEEE
16 years 29 days ago
Modeling Mobility-Assisted Data Collection in Wireless Sensor Networks
—Exploiting mobility to enhance the performance of wireless sensor networks (WSNs), in terms of connectivity, coverage, and lifetime elongation, has recently been the focus of se...
Hisham M. Almasaeid, Ahmed E. Kamal
GLOBECOM
2008
IEEE
16 years 29 days ago
Interference Reduction by Beamforming in Cognitive Networks
— We consider beamforming in a cognitive network with multiple primary users and secondary users sharing the same spectrum. In particular, we assume that each secondary transmitt...
Simon Yiu, Mai Vu, Vahid Tarokh
ICC
2008
IEEE
120views Communications» more  ICC 2008»
16 years 29 days ago
Single-Symbol ML Decodable Precoded DSTBCs for Cooperative Networks
Abstract— Single-Symbol Maximum Likelihood (ML) decodable Distributed Orthogonal Space-Time Block Codes (DOSTBCs) have been introduced recently for cooperative networks and an up...
Jagadeesh Harshan, B. Sundar Rajan
ICCCN
2008
IEEE
16 years 28 days ago
Control Message Reduction Techniques in Backward Learning Ad Hoc Routing Protocols
—Most existing wireless ad hoc routing protocols rely upon the use of backward learning technique with explicit control messages to route packets. In this paper we propose a set ...
Navodaya Garepalli, Kartik Gopalan, Ping Yang