332 search results - page 43 / 67 » Opportunistic Spectrum Access in Cognitive Radio Networks |
ICASSP
2011
IEEE
14 years 1 months ago
2011
IEEE
In Cognitive Radio (CR) systems, spectrum sensing plays a key role to determine the free frequency bands. However, when the primaryuser (PU) signal spectrum exhibits localized fad...
JSAC
2011
14 years 4 months ago
2011
—We analyze the multihop delay of ad hoc cognitive radio networks, where the transmission delay of each hop consists of the propagation delay and the waiting time for the availab...
75
Voted
GLOBECOM
2010
IEEE
14 years 7 months ago
2010
IEEE
Abstract--A common concept to mitigate the effects of spectrum scarcity is to allow opportunistic dynamic spectrum access (DSA) to licensed frequency bands. In this context, the li...
63
Voted
VTC
2006
IEEE
15 years 3 months ago
2006
IEEE
— In this paper, we evaluate a cognitive radio transceiver employing both non-contiguous multicarrier modulation (NC-MCM) and adaptive bit allocation. Although NCMCM and bit allo...
GLOBECOM
2010
IEEE
14 years 7 months ago
2010
IEEE
We propose an analytical model to assess the throughput and connection blocking rate of Opportunistic Spectrum Orthogonal Frequency Division Multiple Access network constituted of ...