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In this paper, detection and estimation of weak signal are presented on the basis of Least-Squares Support Vector Machine (LS-SVM), which is combined with generalized embedding window. Firstly, the embedded dimension and time delay of Lorenz system are determined by improved correlation function method, with which phase space is reconstructed. Then error forecasting model is estimated by LS-SVM with...
Let u be the smallest degree node in a hypercube network with some faulty edges. Suppose that the number of fault-free edges incident with u is not more than that of the others, and denote this number by k . In this article, we mainly concentrate on the conditional hypercube and folded hypercube. In view of this purpose, we prove that there exist k disjoint paths between the smallest degree node and...
Data retrieval problem is a novel research direction about wireless data broadcast. The goal is to find an efficient sequence to download the requested information from public information in wireless communication. The types of data items broadcast in channel are followed: consecutive and no replicated, non-consecutive and no replicated, and non-consecutive and replicated. The goal of above types...
The model of sound scattering by elastic cylindrical shell is built and the mathematical expressions of sound pressure and velocity are deduced. Then the influences of sound scattering on the directivity of vector sensor are simulated at different incident frequencies, shell thicknesses and observing distances. The result shows that when the incident frequency is close to the resonating frequency,...
There will be massive M2M terminals to transmit data via LTE uplink in the future. M2M will inevitably influence the QoS of H2H. However, the existing LTE uplink scheduling algorithms can't be applied to M2M services. It is necessary and urgent to optimize the LTE uplink scheduling algorithms. In this paper, we propose a LTE uplink scheduling algorithm named M2MA-SA under massive M2M and H2H arrivals...
Traditional network coding can reduce forwarding times of data packets, but brings larger delay and network congestions. In this paper, we propose a Partial Network Coding based Real-time Multicast (PNCRM) scheme for supporting real-time multicast services in Mobile Ad-hoc Networks (MANETs). PNCRM combines the partial network coding with the establishment of mesh together. It can not only reduce the...
For high-speed satellite communication system, the symbol rate of the modulated signal is usually high. However, the reliable working clock frequency of the commonly used digital processing chips is relatively lower, thus we should use parallel demodulation structure to achieve high-speed demodulation. A frequency-domain parallel demodulation structure combining matched filter with timing synchronization...
Due to the characteristics of anti-frequency selective fading and supporting high data rate effectively, orthogonal frequency division multiplexing (OFDM) has been widely considered as a key technology for the next-generation mobile communication systems. In this paper, we focus on sub-carrier allocation and utilization in the OFDM access (OFDMA) relaying network, and propose two efficient resource...
Adaptive power allocation subject to the total power constraint in an end-to-end cooperative orthogonal frequency Division multiplexing (OFDM) system is studied, with the optimal power allocation in terms of maximizing the sum transmission Rate being derived. The conventional two-hop system model is extended to a three-hop structure in this paper to improve the Wireless coverage. Independent and identically...
Considering the problem that the well-known bit-reversal algorithm is only fit for radix-2 Fast Fourier Transform (FFT) data reordering, a novel approach based on recursive indexing is proposed for radix-r FFT data reordering. The proposed scheme discards a look-up table required by bit-reversal algorithm. The corresponding hardware structure only costs a RAM whose depth is equal to the size of FFT,...
Understanding spatial and temporal dynamics of mobile internet services in cellular data network can be of great help to network management and service provisioning. To this end, we conduct the detailed measurement analysis of spatial and temporal dynamics from point of view of traffic generated by subscribers. The analyzation is based on a large-scale data set collected from a commercial ISP covering...
Network virtualization has been pushed forward as an important potential solution to the gradual ossification problem faced by the existing Internet, allowing multiple heterogeneous network architectures to cohabit on a shared physical network. Efficient allocating the sacred physical resources among multiple virtual networks requests is a major challenge. Current resource allocation studies mainly...
In this paper, we address the joint precoding design at both the relay and destination nodes for non-regenerative multiple-input multiple-output (MIMO) shared-relay systems. The minimum mean-squared error (MMSE) of symbol estimation at the destination nodes is adopted as our design criterion. In particular, for the two decoding schemes which are the separate decoding scheme and the joint decoding...
In this paper, a new suboptimal tone reservation (TR) algorithm with fixed phase rotation method based on Constant Amplitude Zero Auto-Correlation (CAZAC) sequence is proposed to reduce peak-to-average power ratio (PAPR) in multicarrier code division multiple access (MC-CDMA) systems. To decrease tone searching complexity of TR method, CAZAC sequences is utilized as initial tone candidates. To reduce...
Providing scalable and robust time synchronization among nodes is one of the challenges for designing and operating a large scale wireless sensor network. In this paper, a novel algorithm based on Kalman-consensus filter is proposed to achieve accurate time synchronization in multihop wireless sensor networks. The proposed approach does not need to select a reference node or construct a spanning tree...
In this paper we consider a joint algorithm which combines relay selection with power allocation for two-way Decode-and-Forward (DF) relay channels. The selected relay use network coding to assist transceivers exchanging information. Power allocation at each node under the total transmit power constraint are proposed for better BER performance. A closed-form expression of the end-to-end BER is derived...
Low-density parity-check (LDPC) codes are widely applied in modern communication system for its capability of approaching channel capacity at low complexity. We design an efficient encoding scheme based on LU decomposition for China mobile multimedia broadcasting (CMMB). We search for element with lightest row-multiplying-column weight from the k th row and k th column, and exchange it with diagonal...
In most of existing attacker detection algorithms for collaborative spectrum sensing (CSS) systems, attacking strategies are assumed to be uniform (identical). However, when non-uniform attacking strategies are adopt, the diversity of attacking strategies make it difficult to isolate the attackers. In this paper, to detect the non-uniform strategy attackers, we use the dissimilarity metric of a cognitive...
Device-to-Device (D2D) communication underlaying cellular networks can improve resource utilization and thus increase total throughput. However, resource allocation and interference coordination between cellular networks and D2D system will become critical and need to be properly handled. According to some papers, which just allowed a set of cellular user equipment (UE) and a pair of D2D UEs to coexist...
Signaling storm happened frequently around the world in the recent years, which caused the network congestion, and then affected the user's normal communication. The signaling storm resulted from the large number of signaling consumption that were used for frequent RRC connections. In this paper, we presented a RRC connection release control method to control the user's frequent connection in the...
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