409 search results - page 68 / 82 » Polynomial Time Approximation Schemes and Parameterized Comp... |
PODS
2007
ACM
15 years 9 months ago
2007
ACM
The generalized hypertree width GHW(H) of a hypergraph H is a measure of its cyclicity. Classes of conjunctive queries or constraint satisfaction problems whose associated hypergr...
WWW
2008
ACM
15 years 10 months ago
2008
ACM
Most models for online advertising assume that an advertiser's value from winning an ad auction, which depends on the clickthrough rate or conversion rate of the advertisemen...
ICC
2007
IEEE
15 years 4 months ago
2007
IEEE
Abstract—In this paper we propose a low complexity frequency domain channel estimator for pilot-symbol-assisted (PSA) orthogonal frequency division multiplexing (OFDM) systems in...
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FOCS
2002
IEEE
15 years 2 months ago
2002
IEEE
We consider the problem of testing 3-colorability in the bounded-degree model. We show that, for small enough ε, every tester for 3colorability must have query complexity Ω(n)....
PIMRC
2010
IEEE
14 years 7 months ago
2010
IEEE
This paper tackles the problem of fast varying channel estimation in LTE systems. Particular attention is given to downlink transmission where OFDMA is used as the multiple access ...