8 search results - page 1 / 2 » Using Unclaimed Sub-Carriers in Opportunistic OFDMA Systems |
VTC
2006
IEEE
13 years 10 months ago
2006
IEEE
Abstract— In this paper, we consider the unclaimed subcarriers that no user feeds back in an opportunistic OFDMA system with a per sub-carrier power constraint. Unclaimed subcarr...
JCM
2006
13 years 4 months ago
2006
Abstract-- Future generations of wireless systems require opportunistic spectrum access techniques to effectively detect and access temporarily unused spectrum bands. Cognitive rad...
ETT
2000
13 years 4 months ago
2000
We analyze the effects of Doppler spread in mobile channels on Orthogonal Frequency Division Multiplex (OFDM) systems. This is important, since channel variations during one OFDM s...
GLOBECOM
2006
IEEE
13 years 10 months ago
2006
IEEE
Abstract— In this paper, we propose a distributed opportunistic access scheme for uplink OFDMA systems. The sub-carriers are grouped into several sub-channels. Users access these...
GLOBECOM
2007
IEEE
13 years 11 months ago
2007
IEEE
Abstract— A distributed medium access control (MAC) algorithm for uplink OFDMA networks under the IEEE 802.16 framework is proposed and analyzed in this work. We present a simple...