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As traditional spectrum sensing approaches unable to deal with the contradiction between detection accuracy and complexity in cognitive radio network, a novel q-weighed sequential cooperative energy detection method for spectrum sensing in time varying channel is proposed in this paper to achieve better performance with lower complexity. By adding the q- weighted log likelihood ratio (LLR) of the...
SIMON is a new family of lightweight block ciphers proposed by the National Security Agency (NSA) in 2013. Since its publication, it has attracted much research interest and a number of analysis results have been presented. As a popular kind of implementation attack method, the fault attack also works when it is applied to SIMON. In this paper, we propose an effective fault attack on SIMON under the...
This paper considers the problem of the adaptive speed regulation command filtered control for induction motors drive system with parameter uncertainties based on fuzzy-approximation. Fuzzy logic systems are used to approximate the unknown nonlinear functions. The adaptive command filtered backstepping is employed to construct controllers which can overcome the problem “explosion of complexity” inherent...
Automatic modulation classification (AMC) conducted by a single receiver plays a crucial role in spectrum monitoring and signal interception. To improve the accuracy of feature based AMC, a novel multi-cumulant based modulation classification scheme using uniform linear array is proposed in this paper. Moreover, two methods are formulated to combine the signal from different antenna branches, i.e...
In this paper, we present framing and multiple-physical layer pipe (PLP) structures for layered division multiplexing (LDM)-based next generation terrestrial broadcasting systems. As a framing structure, single-layer frames and multi-layer frames can be simultaneously transmitted by a time division multiplexing (TDM) approach. In addition to a conventional multiple-PLP strategy, which is basically...
This paper presents a new method to estimate the direction of arrival (DOA), which is based on the reduced rank covariance matrix. The new method can reduce the computation complexity greatly and keep a good performance at the same time. For comparison purpose, we compare this new method with the classical multiple signal classification (MUSIC). The results of the root mean square error and the computation...
This paper presents a new methodology based on the reduced rank covariance matrix for direction of arrival (DOA) estimation, which can be have lower complexity compare to the classical Multiple Signal classification (MUSIC). Since the reduced rank covariance matrix contains all the information that the traditional covariance has, the performance of the proposed method is almost the same with the classical...
TV delivery over IP networks (i.e. IPTV) has emerged as one of the major distribution and access techniques for broadband multimedia services. IPTV adopts H.264 as its coding standard due to its high video compression efficiency as well as powerful error resilience features. This paper presents studies on some of the H.264/AVC error resilience features applied to IPTV applications, namely, high definition...
The traditional selective mapping method can be applied to the orthogonal frequency division multiplexing (OFDM) system to improve the peak-to-average power ratio (PAPR) reduction performance, which has to transmit plenty of side information and thus lead to the increase of complexity. To simplify and further improve the system, an improved SLM method is presented in this paper, which uses nonlinear...
In the storage of the ordered tree, for two weaknesses (the XML document is large and the space-efficient LOUDS bit-string can only describe static trees), the space-efficient-tree package format based on the LOUDS bit-string is proposed. This package format can not only store ordered trees space-efficiently, but also achieve the dynamic operations of ordered trees. In the end, a variety of common...
A feedforward carrier phase estimation algorithm using a modified QPSK partition approach followed by maximum-likelihood (ML) detection is proposed. Results demonstrate complexity reduction by more than a factor of 2 compared with other techniques.
In this paper, we consider a novel problem referred to as term filtering with bounded error to reduce the term (feature) space by eliminating terms without (or with bounded) information loss. Different from existing works, the obtained term space provides a complete view of the original term space. More interestingly, several important questions can be answered such as: 1) how different terms interact...
The delivery of High Definition Television (HDTV) over IP networks, namely the HD IPTV, has emerged as one of the major distribution and access techniques for broadband multimedia services. IPTV adopts H.264/AVC as its coding standard due to its high video compression efficiency as well as powerful error resilience features. This paper presents studies on some of these features applied to HD IPTV...
In the last few years, Internet Protocol Television (IPTV) has emerged as one of the major distribution technologies for broadband multimedia services. However, the delivery of High Definition Television (HDTV) services over IP networks still faces many challenges. This paper presents a study on quality assessment of HD video content for IPTV applications. Video sequences with different content types...
Trustworthy network fault diagnosis approach is one critical management item to enhance network trustworthiness. Aiming at gaining highly trustworthy of fault diagnosis in Internet, we present a trustworthy fault diagnosis approach based on integration of Artificial Neural Network and Rule-based Reasoning. Supported by the topology of hierarchical and distributed in multi-domains, reasoning rule matrix...
Vertical Bell-laboratories Space-Time (V-BLAST) is a multiple transmit and multiple receive antennas (MIMO) wireless systems. V-BLAST attains very high spectral efficiency while maintaining low implementation complexity. Among the detection algorithms of V-BLAST, Maximum Likelihood (ML) detection scheme performs the best, and however, its complexity is excessively high. To solve the problem, a reduced...
All the quorum generation algorithms based on greedy algorithm before denotes that the number of nodes selected to insert the quorum should change from one to N0.5, and the time complexity should change from O (2N3.5) to O (N!). Based on this phenomenon, a reasonable supposition will be proposed as follow: When the number of nodes selected to insert in quorum once is belong with the natural number...
A new iterative zero-forcing BLAST with QR decomposition algorithm improving the performance over error propagation is proposed in this paper. In the algorithm, much effort is made on several iterations to obtain the high performance substreams. Simulation results show that the new algorithm greatly improve the performance of the traditional QR detection algorithm with reasonable increase of computation...
In this paper, the performance of an ultra-wideband (UWB) communication system employing orthogonal pulse position modulation (PPM) and non-orthogonal pulse position modulation (NPPM) is considered. Time hopping (TH) is used to decrease the effect of multiuser interference. It is shown that for a large number of users, NPPM provides better bit error rate (BER) performance than PPM. We also determine...
Traditional network is surprisingly fragile and difficult to manage. Yet the current solution of substantial manual configuration makes traditional network management expensive and error-prone. To solve this problem, a network control programmable platform is constructed by in this paper. The platform is consisted of a namespace, a network control primitive library, network event library, a network-wide...
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