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In this paper, we propose a scheme to save power during the execution of backoff algorithm by avoiding idle listening. Existing MAC protocols for sensor networks reduces energy consumption by introducing an active/sleep duty cycle. But they can't save energy during the execution of backoff algorithm. The propose scheme could further improve the energy(More)
Cognitive radio network is an emerging technology in a wireless communications for effectively utilizing the unused spectrum, which are called "spectrum holes". This paper gives the scope for analyzing the literature which manages the spectrum through game theory approach. This work is an analysis of various games through which the cognitive users utilize(More)
In order to solve the pilot pollution problem and realize the low complexity pilot allocation in 5G massive multiple-input and multiple-output (MIMO) communication system, we propose an artificial fish swarm algorithm based pilot allocation scheme in this paper. The algorithm is an imitation of the natural fish activities. Through the search of the region(More)
In this paper, we study the low complexity user-relay assignment problem in amplify-and-forward (AF) cooperative communication systems, where multiple users compete for the same group of relays. In order to reduce the great computational complexity of the exhaustive user-relay assignment algorithm which provides the best performance in multi-user(More)
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