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Neighbor Discovery is one of the emerging research areas in both wireless sensor network and mobile computing applications. The main objective of Neighbor discovery is to acquire information about nearby tags for subsequent communication. Besides, the periodic-signaling mechanism of Neighbor Discovery is suitable for wireless positioning applications. However, the collision problem has been left to...
Although many different community detection algorithms have been proposed to detect community structures in complex networks, how to effectively detect community structures is still a great challenge. Seed-centric methods is one of the most effective solutions for community detection. To more, in this paper, we propose a novel density-based seed expansion algorithm, namely, DenSeC, which can easily...
Due to the rapid growth of Software-Defined Networks, we can manage network traffic easier than before. One of the major issues on SDN is the multipath routing protocols due to its complexity of optimum path selection among the multiple routes. In this paper, we focus on Multipath TCP (MPTCP). MPTCP is an extension of TCP that increases the throughput of TCP communication significantly by utilizing...
In this paper, the problem of distributed beamforming for cognitive radio systems with frequency-selective channel is studied. Our proposed scheme is based on the filter-and-forward (FF) relay beamforming approach and aims to maximize the received signal to interference plus noise ratio (SINR) at the secondary destination, while suppressing the interference introduced to the primary user. This scheme...
In this work, we study the problem of interference in a two-tiered uplink network which contains a macro-cell and multiple small-cells. We null the interference from small-cells to macro-cell by using Vandermonde-subspace frequency division multiplexing (VFDM). VFDM can exploit frequency selectivity and null space generated by the cyclic prefixes (CP) used by the macro-cell communication. We use an...
We have designed and fabricated ultra-low noise, high power laser source and high dynamic range receiver for RF over fiber. Links with Noise Figure of less than 5dB have been measured and dynamic range dependence on link gain investigated. RF optical links were tested successfully in an ESM system.
Optimal power control for relay-assisted cognitive radio networks in which secondary users are assisted by cognitive relays is investigated. A monomial approximation based distributed geometric programming algorithm (MaDGP) is developed to maximize the secondary system utility under the individual and total power constraints of secondary users as well as the interference temperature limits of the...
Optimal power control for relay-assisted cognitive radio networks in which secondary users are assisted by cognitive relays is investigated. A monomial approximation based power control algorithm (MaPC) is developed to 1) maximize the secondary system weighted sum rates; 2) minimize the secondary system weighted sum powers under the individual and/or total power constraints of secondary users as well...
Many papers have studied the joint optimal transceiver design based on the assumption that channel state information (CSI) is perfect at both sides of transceiver, the same imperfect CSI is available at both ends or that transmitter has knowledge of channel distribution. To our knowledge, little effective work has been done on the practical situation that transmitter only knows the imperfect CSI different...
Because of the lack of dedicated frequency bands, the TD-LTE system is possibly deployed in the same band with other existed mobile systems. In this paper, the coexistence studies for the TD-LTE system with the radar system which has been widely deployed in the band 2300-2400 MHz, is presented. The dynamical system simulation methodology is utilized in the coexistence studies, and simulation results...
Proxy blind signature technology integrates the properties of both the blind signature and proxy signature; it can be adopted in applications such as e-cash or e-commerce, etc. In 2008, Yang and Yu proposed an effective proxy blind signature scheme. It not only possesses the security properties of both blind signature and proxy signature, but also progresses in efficiency. Nevertheless, in signature...
In this paper, we consider transmission of two correlated Gaussian sources to two receivers through a two-user Gaussian Z interference channel (Z IC). To facilitate our study, we first investigate Gaussian multiple access channels with correlated Gaussian sources and a single distortion constraint at the receiver. Lower bounds on the distortion as well as several achievable schemes are proposed. In...
Spectrum sensing is an important component of cognitive radio technology. Cooperative spectrum sensing is regarded as the most promising method to improve the reliability of spectrum sensing. However, such cooperation also introduces overhead traffic of control signaling and result transmission which consumes more power in battery operated mobile terminals. In this paper, an RLECSS (run-length encoding...
Cognitive radio is observed as a new approach, which could be cope with the spectral limitations. This approach is designed to detect whether a particular segment of the radio spectrum is currently in use and to jump into the temporarily unused spectrum rapidly without interfering with the transmissions of other users. CR is the promising radio technology which aims to detect and utilize the temporally...
Spectrum sensing is a crucial measure for cognitive radio networks (CRN) to protect transmission of primary users. Cooperative spectrum sensing is regarded as the most promising method to improve the reliability of spectrum sensing. However, such cooperation also introduces overhead traffic of control signaling and result transmission which consumes more power in battery-operated mobile terminals...
Motivated by [1], we consider the problem of simultaneous message transmission and state estimation over Gaussian broadcast channels. In particular, two independent messages are transmitted over a state dependent Gaussian broadcast channel with noncausal side information at the transmitter. The receivers, in addition to decode their own messages, also try to estimate the state information. Using squared-error...
In cognitive radio networks, secondary users (SUs) opportunistically exploit the spectrum unutilized by primary users (PUs). In this paper, we study the secondary communication where secondary transmitters and receivers have different available spectrum. Considering the spectrum diversity and the space distance between different PUs, we introduce cognitive relay node into the secondary communication...
The special bistatic space based radar (BiSBR) system, which is composed of an illuminator on a geostationary satellite and a receiver on an airship, can be operated for area surveillance. It is anticipant for the realization of detection and tracking capabilities to moving targets that the high signal-to-noise ratio (SNR) is distributed uniformly in the theater area. In this paper, based on three...
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