483 search results - page 61 / 97 » On perfectness of sums of graphs |
STOC
2005
ACM
14 years 9 months ago
2005
ACM
We introduce a new graph parameter, called the Grothendieck constant of a graph G = (V, E), which is defined as the least constant K such that for every A : E R, sup f:V S|V |-1 ...
CISS
2008
IEEE
14 years 3 months ago
2008
IEEE
—In this paper, we propose a low complexity linear multiuser beamforming system for the multiple-input multipleoutput (MIMO) broadcast channel. We consider the specific case of ...
GLOBECOM
2007
IEEE
14 years 3 months ago
2007
IEEE
— In this paper, we study a wireless multiple-input multiple-output system in a Rayleigh flat-fading environment with correlation among the transmit antennas. We assume that the...
JSAC
2007
13 years 8 months ago
2007
Abstract— We consider both the single-user and the multiuser power allocation problems in MIMO systems, where the receiver side has the perfect channel state information (CSI), a...
TWC
2008
13 years 8 months ago
2008
OFDMA resource allocation assigns subcarriers and power, and possibly data rates, to each user. Previous research efforts to optimize OFDMA resource allocation with respect to comm...