The construction method, throughput and related properties about the topology model of emergency communication networks were discussed. Firstly, the topology modeling method was presented by three steps, such as the c...
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The construction method, throughput and related properties about the topology model of emergency communication networks were discussed. Firstly, the topology modeling method was presented by three steps, such as the constructions of backbone network, access network and station network. Then, the capacity of network model was analyzed in conditions of arbitrary networks and random networks. At last, some topology properties were discussed, including the shortest path, node degree, rich club, betweenness centrality, current flow centrality, eccentricity and closeness vitality. The experiment re-sults show that the proposed modeling method is steady and applicable to the emergency communication.
Spectrum sensing is one of the fundamental problems for cognitive radio. In cognitive radio networks, cognitive radios can cooperatively sense the spectrum to detect the presence of primary users with higher sensitivi...
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In software defined radio (SDR) transmitter, the baseband data with protocol-specific symbol rate should be up-sampled to the fixed sample rate of synthesized carrier by arbitrary sample rate conversion (ASRC), before...
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Cognitive Radio (CR) is considered as an effective technology for alleviating the spectrum shortage problem by enabling secondary users to utilize vacant spectrum allocated to a primary user (PU). IEEE 802.22 which is...
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Wideband spectrum sensing is a fundamental problem in cognitive radio networks. In this paper, a wideband spectrum sensing procedure which consists of four steps, i.e., coarse support recovery, fine binary detection, ...
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Passive localization using TDOA and FDOA measurements usually does not have direct solution and requires numerical methods to determine the emitter's geolocation. We examine a satellite passive localization method...
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This paper proposes a novel planar inverted-F antenna (PIFA) with metamaterial loaded on the ground plane. The metamaterial is composed of an array of Jerusalem cross-shaped PEC structure. Simulation results show that...
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In this paper, a wideband circularly polarized (CP) microstrip antenna with capacitively coupled feed is presented. There is a pair of slits and two pairs of truncated corners on the patch. A metallic disk connected t...
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The patch antenna with metamaterial lens can effectively enhance the gain of the antenna. A new type of metamaterial lens is proposed in this paper, it is easy to distinguish as double negative metamaterial, presentin...
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In this paper, a low profile and broadband monopole patch antenna is proposed. The antenna consists of a monopole, which is formed by connecting six triangle plates together. A regular hexagon patch is shorted to the ...
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