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To reduce cooperation overhead in Amplify-and-Forward (AF) relay networks, a group-sparse penalty is introduced into the objective function to design beamformers for balancing the size of active relays and the signal-to-noise ratio (SNR) at the destination. To deal with the non-convexity and non-smoothness of the problem, the proximal gradient algorithm (PGA) is proposed, which can converge to a local...
This paper studies the problem of adaptive resource allocation in OFDMA system. An ant colony algorithm based adaptive resource allocation is proposed in this paper. The problem is modeled as finding a minimum cost path in a graph. The ants' solution construction is guided by pheromone trail and heuristic information. Due to the unique heuristic searching mechanism of the ant colony algorithm, the...
Cognitive radios are expected to improve the capacity of wireless mesh network dramatically. In this paper, we model the channel heterogeneity, which is a unique feature in cognitive radios, and present a cross-layer design framework which jointly considers the spectrum sharing, scheduling and routing with the objective of minimizing the system total activation time, i.e., maximizing the system capacity...
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