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In-band full-duplex communications have been spotlighted because they can double the spectral efficiency of the current wireless communication systems. However, it is necessary to mitigate the self-interference (SI). Currently, several time-domain and frequency-domain SI cancellers have been proposed. Time-domain SI cancellers are based on the parallel Hammerstein (PH) model, and they have good flexibility...
In wireless ad hoc networks, neighbor discovery is essential for medium access control and routing. In this paper, we propose a new neighbor discovery algorithm utilizing in-band full duplex. This algorithm employs a reservation scheme with full duplex into an existing algorithm based on half-duplex. We analyze neighbor discovery time of both algorithms with absorbing Markov chain models and simulations...
A large number of battery-driven sensor nodes are deployed to operate a wireless sensor network, and thus power saving of nodes is a problem of vital significance. Many routing methods have been proposed to reduce energy consumption. In light of this fact, if it can be known how much energy consumption will be required for sensor nodes to operate a network before deploying the nodes, it will help...
Nowadays, mobile wireless sensor networks have many applications especially in a group movement such as evacuation system, search and rescue activity. To support the group movement and to achieve an energy-efficient protocol, we propose a Group mobility based Clustering (GC) scheme. This protocol reduces the control overhead in the setup phase of a clustering system by introducing a concept of group...
Routing protocols using directional antennas can utilize knowledge of a direction. For example, these protocols are possible to reduce redundant traffic by controlling a propagation direction of a packet based on the positional relation among nodes. To implement direction-oriented communication protocols, we must make a mechanism to detect the direction from which a packet comes. We construct a communication...
Recently, many studies in wireless ad hoc networks assume the use of smart antennas which can electronically control their beam pattern. Communications using smart antennas can be expected to improve spatial utilization efficiency and to extend communication distance. However, there are some unique problems caused by the use of the smart antennas. In this paper, we focus on the directional hidden...
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