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Recent studies demonstrate that Cognitive Radio (CR) technology can increase the spectrum efficiency of wireless systems, provided that the activity of primary users (PUs) must be carefully protected. For this reason, several sensing schemes leverage the cooperation among nodes to increase the accuracy of PU detection. In this paper, we propose to employ the CR principles in the vehicular environment...
To minimize interference with primary users, one of the major concerns in cognitive radio is to determine the allowable transmission power. This paper addresses the problem of power management to insure on one hand, no interference with primary user and on the other hand, the requested QoS (Quality of Service) level to the secondary transmitter. In this paper we propose a two steps method to determine...
In this paper we propose a distributed approach to construct vicinity resource maps at each node in a delay-tolerant network. The scheme uses recent encounters to estimate the availability of the following resources: energy, buffer space, and bandwidth, in the vicinity of a given node. We then show how a store-carry-forward scheme may benefit from having access to these resource estimates. While knowledge...
This work addresses the application of the cross-layer paradigm to the design of efficient resource allocation algorithms for the downlink of a MIMO-OFDMA system with a physical layer employing optimal single-stream/single-user linear precoding. Mathematical programming tools are used to solve the problem of weighted throughput maximization using both channel state information from the physical layer...
In this paper, we focus on robust power allocation strategies, against the imperfectness of the channel state information at the transmitters in discrete power allocation games. Considering imperfectness in term of payoff measurement and time delays at the transmitters, we propose a Delayed COmbined fully DIstributed Payoff and Strategy Reinforcement Learning (Delayed-CODIPAS-RL) in which each transmitter...
In this paper we propose a novel multicarrier (MC) architecture to address the energy saving problem in WLAN applications. We refer to this scheme as hybrid filtered multitone (H-FMT). Depending on the channel condition, H-FMT wisely switches between Filtered Multitone Modulation (FMT) with orthogonal pulses and adaptive orthogonal frequency division multiplexing (A-OFDM). We show that H-FMT provides...
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