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Compared with the traditional two-dimensional (2D) deployment form, three-dimensional (3D) deployment of sensor network has greater research significance and practical potential to satisfy the detecting needs of targets with complex properties. In this paper, a method for 3D deployment optimization of sensor network based on an improved Particle Swarm Optimization (PSO) algorithm is proposed. Many...
We consider a sensor communication scenario where a sensor node communicates information to a data sink. To aid the sensor, the data sink transmits channel state information (CSI). To obtain the CSI, however, a fixed receive processing energy is incurred by the sensor node. Given a choice, the sensor node may choose not to obtain the CSI if the receive processing energy does not lead to a larger reduction...
In Time Division Duplex(TDD) system, the radio frequency (RF) power amplifier in a repeater is turned on only when it receives RF signal, thus implementing the sub-frame synchronization and the second conversion point of timeslots is important in TDD system. This paper introduce a bias circuit design to realize the control of the RF power amplifier in the down-link through envelop detection of the...
In this paper, we consider a dual-hop regenerative relay system consisting of one source node, one destination node and multiple relay nodes. All nodes are equipped with a single antenna except the destination node. We discuss two different relay selection strategies: 1) selection of the best relay; and 2) selection of all reliable relays. We investigate the optimal power allocation (PA) and relay...
In this paper, we consider a relay system with a number of potential relay nodes. We propose several relay assignment protocols to select a relay node to help transmit source data so that the average outage probability of the system is reduced. These protocols include: Optimal-Position relay assignment, Nearest-Optimal-Position relay assignment, and Left (Right)-Nearest-Optimal-Position relay assignment,...
We consider multi-hop decode-and-forward relaying OFDM systems in this paper. All the relay nodes are assumed to be regenerative and working in half-duplex mode. We propose adaptive power allocation (PA) algorithms to maximize the overall system capacity and minimize the system outage probability, respectively. Simulation results show that the proposed algorithms outperform the existing PA algorithms...
In the research of antiaircraft system, how to make full use of the firepower units and cause maximum damage to enemy targets, is a key problem of firepower allocation. Based on the characteristics of the antiaircraft system, the description of firepower allocation for antiaircraft system is presented and the mathematical model is established. The calculational method of threaten estimation is given...
Replication mechanism is the efficient method of improving grid performances and reducing client delay. Replica placement strategy is the key problem of replication mechanism. This paper introduces the architecture of education resource grid. According to the architecture, it presents three dynamic replica placement strategies. These strategies can optimize the system performance from different aspects...
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