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In this paper, we study the radio resource allocation for femtocell networks in orthogonal frequency division multiple access (OFDMA) systems from the aspect of users' quality of experience (QoE). Three types of services are considered including audio stream, data stream and video stream. With the metric being mean opinion score (MOS), a two-tier network is modeled and optimization problem is formulated...
Cognitive radios share the whitespace in the absence of licensed users. For spectrum sharing, avoiding the interference among multiple secondary users is a fundamental problem (known as dynamic spectrum allocation problem). This paper proposes a factor graph based approach to solve the dynamic spectrum allocation problem in an efficient manner. With the proposed DWA-Tree (Distributed Wave Algorithm),...
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