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In cognitive radio networks, the process of sensing the potential channels and choosing free ones to access in is called spectrum access. In this paper, three spectrum access schemes are compared. They are sensing-all before accessing scheme, Partially Observable Markov Decision Process (POMDP) based scheme and sequential channel sensing scheme. The efficacy of these schemes is studied by both theoretical...
Energy efficiency and spectral efficiency are two important aspects of wireless system. In this paper, a distributed scheme of energy-efficient power control is addressed jointly with 3D-beamforming (3D-BF), named as energy-efficient 3D-beamforming (EE-3DBF). In consideration of the high complexity to deal with power control and 3D-BF simultaneously, EE-3DBF is divided into limited coordination downtilt...
Energy efficiency (EE) is an important factor for the deployment of wireless sensor networks. Cooperative communication can help to reduce energy consumption for long distance data transmission. This paper mainly presents the optimal power allocation scheme for cooperative communication in wireless sensor networks. We formulate the EE maximization problem with power constraint, and show that this...
This paper studies the traffic overload control issue in the new generation electric communication network. We propose an energy-efficient traffic overload control algorithm based on genetic algorithm and hybrid particle swarm optimization. We simultaneously consider the traffic overload control and energy efficiency in the soft-switch server of new generation electric communication networks. Then...
The massive random accesses of machine type communication (MTC) in current wireless networks (e.g. LTE-A, WiMAX) are a challenging and urgent issue. In this paper, the random access performances in LTE-A networks are first analyzed in terms of success probability, access delay, physical random access channel efficiency, and the number of retransmissions. Based on the analysis, two QoS-based optimization...
As wireless sensor networks are constituted of nodes with limited life batteries, energy efficiency is a very important metric at all levels of system design. Therefore, performing optimal modulation schemes is a crucial task at the physical layer of this class of networks. This paper investigates the best modulation strategy to minimize the total energy consumption required to send a given number...
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