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Resource allocation plays an important role in orthogonal frequency division multiplexing (OFDM) based relaying systems. In this paper, we jointly consider power allocation (PA) and subcarrier pairing (SP) in a relaying system in which a source node sends OFDM signals to a destination node with the help of a full-duplex (FD) relay node. Under individual power constraints at both the source node and...
A multi-carrier one-way relay network is considered, in which a source wishes to send information to a destination via a full-duplex amplify-and-forward relay. We perform power allocation across different subcarriers for the source and the relay, as well as subcarrier pairing at the relay, so as to maximize the achievable sum rate subject to individual power budget constraint at each transmit node,...
Performance of multihop cooperative sensor networks depends on relaying candidate selection, optimal relay assignment, and cooperative communication. In this paper, we first propose a novel relaying candidate selection scheme (KCN-selection) to choose k-cooperative nodes (KCN) at each hop based on geographic information, while the certain number of k is initially determined based on an on-demand end-to-end...
This paper discusses the relationship of line overload cascading and loss of synchronism in interconnected power systems. The mechanisms of recent blackouts ending in loss of synchronism are reviewed and assessed. Further, theoretical considerations about the phenomenom of loss of synchronism ending in Out of Step (OOS) are discussed. Moreover, loss of synchronism scenarios are simulated in a multi-area...
In this paper, we study a new full duplex relaying (FDR) network in which the relay has a buffer and works in decode-and-forward (DF) protocol. We investigate the performance of three models in terms of throughput, i.e., Full duplex relay without buffer-aided (conventional FDR), full duplex relay with unlimited buffer, and full duplex relay with limited buffer, respectively, and derive the closed-form...
Device-to-Device (D2D) communication underlaying cellular networks enhances the system capacity by efficient spectrum utilization, which significantly benefits local area services. On the other hand, physical layer network coding (PNC) can achieve more efficient two-way transmission. Thus, PNC aided two- way D2D communications have the potential to further increase the system capacity, where joint...
Spectrum sharing for cognitive two-way relaying is considered in this paper. A secondary relay is used to assist two-way communications between two primary users, and as a return, the secondary relay is allowed to transmit its own secondary signal by using some of the licensed primary spectrum. Three different spectrum sharing strategies are studied in this paper. In the baseline superposition coding...
With the emerging demands for extensive mobile applications, Device-to-Device (D2D) communication is viewed as an important technology for the next-generation cellular communication and mobile networks to increase spectral efficiency and enhance network capacity. Existing works usually study D2D communications under a network consisting of four nodes. In this paper, we jointly investigate the problems...
Cognitive two-way relaying is studied in this paper. A secondary relay is used to assist bidirectional communication between a pair of primary users. As a return, the secondary relay is allowed to transmit its own secondary signal on the licensed primary spectrum. For this purpose, superposition coding is employed at the relay to superimpose the secondary signal on the primary signals. Three typical...
Targeting for providing communication services in the Intermittently Connected Vehicular Networks (ICVN) where there are no end-to-end communication and routing paths between vehicles, many relaying algorithms and routing protocol have been proposed under the assumption that vehicular nodes in the network are homogeneously distributed in the network with the same contact rate and delivery cost. However,...
In disruption tolerant networks, gossip is an efficient routing scheme, which significantly reduces the message delivery overhead while maintaining a relatively high delivery rate. This mechanism needs network nodes to forward messages and data according to the system-defined gossip probability in a selfless and cooperative way. In this paper, we investigate how node selfishness influences the performance...
Mobility plays an important role in the message transmission of Disruption Tolerant Networks (DTNs), and we need to control the mobility of nodes around the network to efficiently carry and relay messages around the network. This is a challenging problem since the nodes in the network may move arbitrarily and it is hard for us to determine how the nodes should move, faster or slower, to help with...
Radio spectrum resources are becoming scarce with the increasing demand for multiple users wireless services. Hence, it is an important problem to increase the system potential capacity and coverage for wireless system in future. This paper aims at proposing a relay algorithm based on power control and SINR evaluation for two-hop OFDM cellular networks with fixed relay stations. This algorithm improves...
Now more and more distributed generations will be connected to distributed power system. It's found that different distributed generation has its own operation characteristic such as fluctuation and uncertainty. When micro-grid is to be island the voltage and frequency will change, so different control modes have been used on different distributed generation. Different kinds of distributed generation...
Aiming at tank weapon system and considering particularity of its structure, the procedure of the Maintainability Growth and the Maintainability Growth technology based on virtual prototype are proposed, and a Maintainability Growth case of typical structure using that procedure and technology is established.
In Delay Tolerant Networks (DTNs), there exists only intermittent connectivity between communication sources and destinations. In order to provide successful communication services for these challenged networks, a variety of relaying and routing algorithms have been proposed with the assumption that nodes are homogeneous in terms of contact rate and delivery cost. However, various applications of...
Although the established capacity results for the classic three-node relay channel rely on the assumption of full-duplex relay nodes, it's practically difficult for radio transceivers to support simultaneous signal transmission and reception. Time-division half-duplex relay strategies have thus been proposed to address this limitation. Amplify-and-forward (AF) and decode-and-forward (DF) are two well-known...
Wireless cooperative relay is an efficient way in obtaining diversity in distributed manner, and it can also be used as a way in extending the cell coverage in cellular systems. In this paper, assuming receiver channel state information (CSI) only, the ergodic and outage capacity analysis are presented for amplify-and-forward (AF) multiple-input multiple-output(MIMO) relay channels deploying orthogonal...
In Delay Tolerant Networks, energy efficient forwarding algorithms are significant to enhance the performance of messages' transmission probability. In this paper, we focus on the problem of optimal opportunistic epidemic forwarding with energy constraint. By introducing a continuous time model, we obtain the optimal static and dynamic policies for multi-messages forwarding. Extensive simulations...
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