369 search results - page 7 / 74 » A Distributed Opportunistic Access Scheme for OFDMA Systems |
ICC
2009
IEEE
15 years 4 months ago
2009
IEEE
Abstract— Relaying and orthogonal frequency division multiple access (OFDMA) are the accepted technologies for emerging wireless communications standards. The activities in many ...
CORR
2010
Springer
14 years 9 months ago
2010
Springer
The knowledge of channel statistics can be very helpful in making sound opportunistic spectrum access decisions. It is therefore desirable to be able to efficiently and accurately...
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MOBICOM
2009
ACM
15 years 3 months ago
2009
ACM
Establishing a control channel for medium access control is a challenging problem in multi-channel and dynamic spectrum access (DSA) networks. In the design of multi-channel MAC p...
WIMOB
2007
IEEE
15 years 3 months ago
2007
IEEE
As part of the IEEE 802.16 protocol, the random access scheme is used for ranging. The ratio between the numbers of periodic ranging slots and data slots in the uplink subframe de...
MONET
2006
14 years 9 months ago
2006
The Open Spectrum approach to spectrum access can achieve near-optimal utilization by allowing devices to sense and utilize available spectrum opportunistically. However, a naive d...