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Orthogonal frequency division multiplexing (OFDM) is one important technologies of power line communication (PLC). This paper presents a new timing synchronization method for OFDM system which can be used in PLC. The proposed timing method is performed by calculating the correlation between the received signal and a local training sequence which is the same as the training sequence of OFDM signal...
In recent years, small, inexpensive UAV - also known as drone - has made great progress, which brings privacy and security issues. Drone detection is one of the important methods to solve these problems. The main challenges of drone detection are: (1) A drone is very confusing with other flying objects such as a bird, (2) the low-flying UAV occlusion happens very frequent, and (3) the existing surveillance...
The precision time protocol (PTP) is fundamentally recommended in smart substations, which could potentially result in further weakening the power system. However, defects of domestic PTP devices restrict the spread of the application of PTP in smart substations. In this paper, the computation of the PTP offset in different clock modes from the two editions of 1588 standards is analyzed theoretically...
First, this paper studies the separation of shortwave calling channels and service channels, orthogonal grouping of frequency set, synchronized scanning and rapid frequency choosing, and nonlinear frequency scanning. These are the four foundations needed to realize frequency spectrum sharing. Then, we explore a way to realize dynamic sharing of military shortwave frequency spectrum by synchronized...
This paper addresses the problem that how to identify the topology of complex dynamical networks. In this paper, we use the output variable, to be the feedback in order to identify the topology of a complex dynamical network. The global stability of the observer is analytical proved using the Lyapunov theory to show the asymptotically stable conditions can be achieved. Finally, a numerical simulation...
Recently, lots of work investigated the geometry features, synchronization and control of complex dynamical networks provided with certain topology. But in the real life, the exact topology of a network is often uncertain. In this paper, a new approach for approximately identifying the topology of a complex network is proposed based on the state observer design only using a scalar coupling signal...
In this paper, a novel cluster based adaptive MAC protocol for wireless sensor networks (WSN) is proposed, which is based on clustering network topology. In the proposed MAC protocol, sensor nodes can adjust the duty cycle freely according to traffic information collected by cluster head node. Meanwhile, by exploiting cross-layer routing information, sensor nodes can reduce the active period if no...
In this paper, we propose a variable packet length adaptive MAC Protocol (VPLA-MAC) for wireless sensor networks. VPLA-MAC is designed for clustering hierarchy networks based on the routing information collected from sensor nodes. A sensor node in cluster sends packet length and routing information to cluster head node, this cluster head node calculates the cycle length and selects nodes for data...
In this paper, we propose TA-MAC, a duty cycle MAC protocol with traffic adaptive for sensor networks. Through dynamically increasing extra transmission cycle in original basic cycle, TA-MAC can forward more packets in single cycle when traffic loads increase. The simulation results in ns-2 shows that our protocol achieves lower end-to-end delivery latency over S-MAC and the mean time, energy efficiency...
Time synchronization is a major challenge and a rich area of study in chirp ultra-wideband (UWB) communication systems. Since the pulse compressed by the matched filter is very short, the performance of chirp receivers is closely relative to precise timing acquisition. However, the existent method is very sensitive to noise. In this paper, we propose an improved synchronization method that allows...
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