178 search results - page 7 / 36 » An iterative power allocation algorithm in OFDM system based... |
TWC
2008
13 years 7 months ago
2008
In this paper, a dynamic subcarrier and power allocation problem is considered in the context of asymptotic utility maximization in multi-carrier systems. Using the gradient-based...
GLOBECOM
2006
IEEE
14 years 1 months ago
2006
IEEE
Abstract— For multi-user orthogonal frequency division multiplexing (OFDM) systems, efficient optimal rate and power allocation algorithms are presented via geometric programmin...
MOBICOM
2009
ACM
14 years 1 months ago
2009
ACM
Cognitive radio is an enabling technology that allows unlicensed users to opportunistically access the spectrum in order to enhance the spectrum efficiency. In this paper, we cons...
ICC
2007
IEEE
14 years 1 months ago
2007
IEEE
Abstract—This paper considers a broadband cellular orthogonal frequency-division multiple-access (OFDMA) system with relay nodes operating in decode-and-forward and half-duplex m...
GLOBECOM
2008
IEEE
14 years 1 months ago
2008
IEEE
—This paper addresses the use of adaptive modulation in progressive image transmission with multiple description coding in conjunction with an Orthogonal Frequency Division Multi...