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In this paper, we present a distributed relay selection and power allocation scheme concurrently considering the channel states of all related links and residual energy state of the relay nodes for cooperative transmission in cognitive radio (CR) networks. Specifically, we formulate the CR network with cooperative transmission as a restless bandit system, which has been widely applied in operations...
This paper considers a spectrum underlay network, where an OFDM-based cognitive radio (CR) system is allowed to share the subcarriers of an OFDMA-based primary system for simultaneous transmission. Instead of using the conventional interference power constraint (IPC) to protect the primary users (PUs) in the primary system, a new criterion referred to as rate loss constraint (RLC), in the form of...
Cognitive radio is an emerging technique to improve the spectrum utilization in future wireless communication systems. In this paper, we study the power allocation strategy of cognitive orthogonal frequency division multiplexing (OFDM) system, where both primary user and cognitive user have multiple channels to transmit. The mathematical optimization problem is first formulated, based on the interference...
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