Convex Optimization
Auction-based spectrum sharing
Mobile Networks and Applications
Dynamic Spectrum Access with QoS and Interference Temperature Constraints
IEEE Transactions on Mobile Computing
Rate-optimal multiuser scheduling with reduced feedback load and analysis of delay effects
EURASIP Journal on Wireless Communications and Networking
Opportunistic Spectrum Access via Periodic Channel Sensing
IEEE Transactions on Signal Processing
On compound channels with side information at the transmitter
IEEE Transactions on Information Theory
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Decentralized cognitive MAC for opportunistic spectrum access in ad hoc networks: A POMDP framework
IEEE Journal on Selected Areas in Communications
Joint Bandwidth and Power Allocations for Cognitive Radio Networks with Imperfect Spectrum Sensing
Wireless Personal Communications: An International Journal
Cross-layer design in opportunistic spectrum access-based cognitive radio networks
International Journal of Communication Networks and Distributed Systems
Joint Relay Selection and Power Allocation for Cooperative Cellular Networks
Wireless Personal Communications: An International Journal
Spectral efficiency of cognitive radio networks under interference constraint and QoS guarantees
Computers and Electrical Engineering
Sensing Confidence Level-Based Joint Spectrum and Power Allocation in Cognitive Radio Networks
Wireless Personal Communications: An International Journal
Hi-index | 0.01 |
In most of the existing works on cognitive radio (CR) systems, the spectrum sensing and the cross-layer scheduling are designed separately. Specifically, the sensing module first determines whether or not a channel resource is available for the CR system based on the sensing information. The scheduling module then schedules the data transmission of different users on the available channels based on the hard-decision sensing information (HSI). In this paper, we shall propose a joint cross-layer and sensing design and study its performance advantages over the aforementioned traditional decoupled approaches. We shall consider the downlink transmission of an OFDMA-based secondary system sharing the spectrum with primary users using cognitive radio technology. We shall rely on the joint design framework to optimize a system utility, which adapts the power allocation and the subcarrier assignment across the secondary users (under a average interference constraint to the primary users) based on both the channel state information (CSI) and the raw sensing information (RSI). In addition, we shall also propose a distributed implementation for the cross-layer sensing and scheduling design using primal-dual decomposition approach. Simulation results reveals the substantial performance gain of the proposed joint design over the conventional CR systems.