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2008 Vol. 30, No. 10
Display Method:
2008, 30(10): 2287-2290.
doi: 10.3724/SP.J.1146.2007.01553
Abstract:
A robust spatio-temporal video denoising algorithm is proposed based on the motion estimation, which is embedded into the video encoder. On one hand, this algorithm can be used in the space domain to eliminate the false similar pixels from neighbor p...
A robust spatio-temporal video denoising algorithm is proposed based on the motion estimation, which is embedded into the video encoder. On one hand, this algorithm can be used in the space domain to eliminate the false similar pixels from neighbor p...
2008, 30(10): 2291-2294.
doi: 10.3724/SP.J.1146.2007.00534
Abstract:
To resolve the issue of window width selection, an adaptive algorithm for Gabor transform is proposed, which improves the concentration and time-frequency resolution of Gabor representation. The value range of Shannon entropy is mended to make it mor...
To resolve the issue of window width selection, an adaptive algorithm for Gabor transform is proposed, which improves the concentration and time-frequency resolution of Gabor representation. The value range of Shannon entropy is mended to make it mor...
2008, 30(10): 2295-2298.
doi: 10.3724/SP.J.1146.2007.00388
Abstract:
A novel method is proposed to estimate 2-dimensional (2-D) angles of arrival (AOAs) of wideband chirp signals in direction-dependent sensor complex gain condition. In this method, via the algebraic structure of wideband chirp signals time-varying man...
A novel method is proposed to estimate 2-dimensional (2-D) angles of arrival (AOAs) of wideband chirp signals in direction-dependent sensor complex gain condition. In this method, via the algebraic structure of wideband chirp signals time-varying man...
2008, 30(10): 2299-2302.
doi: 10.3724/SP.J.1146.2007.00483
Abstract:
The rules of correlation between auto-terms and cross-terms of Wigner-Ville Distribution(WVD) are obtained by analyzing the WVD and a new method to suppress cross-terms of WVD using Adaptive Short-Time Fourier Transform (ASTFT) spectrum is put forwar...
The rules of correlation between auto-terms and cross-terms of Wigner-Ville Distribution(WVD) are obtained by analyzing the WVD and a new method to suppress cross-terms of WVD using Adaptive Short-Time Fourier Transform (ASTFT) spectrum is put forwar...
2008, 30(10): 2303-2306.
doi: 10.3724/SP.J.1146.2007.00617
Abstract:
PCM signal is a kind of pulse compression signal which is widely used in low probability of intercept adopting pulse compression radar system. An accurate estimation of Doppler frequency rate-of-change from received signal is a key technology in the ...
PCM signal is a kind of pulse compression signal which is widely used in low probability of intercept adopting pulse compression radar system. An accurate estimation of Doppler frequency rate-of-change from received signal is a key technology in the ...
2008, 30(10): 2307-2310.
doi: 10.3724/SP.J.1146.2007.00384
Abstract:
A DWT domain multiple watermarking scheme based on blind source separation is proposed in this paper. In consideration of the embedding order and safety, two original watermarks are mixed with a chaotic sequence to generate an embedding watermark sig...
A DWT domain multiple watermarking scheme based on blind source separation is proposed in this paper. In consideration of the embedding order and safety, two original watermarks are mixed with a chaotic sequence to generate an embedding watermark sig...
2008, 30(10): 2311-2314.
doi: 10.3724/SP.J.1146.2007.01666
Abstract:
A novel fast multi-mode motion estimation algorithm based on the quantum clonal selection is proposed. According to the predictive motion vectors derived from spatio-temporal coherence of video sequences, the type of searching modes can be confirmed ...
A novel fast multi-mode motion estimation algorithm based on the quantum clonal selection is proposed. According to the predictive motion vectors derived from spatio-temporal coherence of video sequences, the type of searching modes can be confirmed ...
2008, 30(10): 2315-2319.
doi: 10.3724/SP.J.1146.2007.00499
Abstract:
In order to extract effectively the feature of SEMG signal, an improved method of feature extraction based on correlation analysis is proposed. Firstly, the paper decreases the noise included in two channel SEMG signals using spatial correlation filt...
In order to extract effectively the feature of SEMG signal, an improved method of feature extraction based on correlation analysis is proposed. Firstly, the paper decreases the noise included in two channel SEMG signals using spatial correlation filt...
2008, 30(10): 2320-2324.
doi: 10.3724/SP.J.1146.2007.00566
Abstract:
Based on the particle swarm optimization and antibody clonal selection theory, a novel Orthogonal Immune Clone Particle Swarm Algorithm (OICPSO) is presented to solve multiobjective optimization. According to the problem characters, clone operator, i...
Based on the particle swarm optimization and antibody clonal selection theory, a novel Orthogonal Immune Clone Particle Swarm Algorithm (OICPSO) is presented to solve multiobjective optimization. According to the problem characters, clone operator, i...
2008, 30(10): 2325-2328.
doi: 10.3724/SP.J.1146.2007.00417
Abstract:
The automatic detection of building boundaries in a single high-resolution urban SAR (Synthetic Aperture Radar) image based on watershed transform with markers is proposed in this paper. According to the strong radar backscatter energy and shape feat...
The automatic detection of building boundaries in a single high-resolution urban SAR (Synthetic Aperture Radar) image based on watershed transform with markers is proposed in this paper. According to the strong radar backscatter energy and shape feat...
2008, 30(10): 2329-2332.
doi: 10.3724/SP.J.1146.2007.00251
Abstract:
An algorithm for measuring missile-target miss distance using radar data processing is presented. Based on accurate three-dimensional motion mode, the curve of square-distance translated from radar data between missile and target is fitted with nonli...
An algorithm for measuring missile-target miss distance using radar data processing is presented. Based on accurate three-dimensional motion mode, the curve of square-distance translated from radar data between missile and target is fitted with nonli...
Preprocessing of Target Recognition of the Instantaneous Polarimetric Radar in the Jamming Situation
2008, 30(10): 2333-2337.
doi: 10.3724/SP.J.1146.2007.01525
Abstract:
The polarization scattering matrix characteristic of the active decoys produced by the single polarized repeater is analysed under the background of the anti-jamming of the instantaneous polarimetric radar. It is shown that the characteristics of act...
The polarization scattering matrix characteristic of the active decoys produced by the single polarized repeater is analysed under the background of the anti-jamming of the instantaneous polarimetric radar. It is shown that the characteristics of act...
2008, 30(10): 2338-2342.
doi: 10.3724/SP.J.1146.2007.00545
Abstract:
Secondary data acquired with sliding window method can accurately estimate clutter statistics of target-gate under localized stationary environment. In this paper, a recursive QR factorization method based on sliding window is presented, which adopts...
Secondary data acquired with sliding window method can accurately estimate clutter statistics of target-gate under localized stationary environment. In this paper, a recursive QR factorization method based on sliding window is presented, which adopts...
2008, 30(10): 2343-2346.
doi: 10.3724/SP.J.1146.2007.00418
Abstract:
In order to satisfy some special demands for detection and recognition to the guiding radar of Air Defense Missile Weapon System (ADMWS) using an active radar seeker, an analysis method of planar slotted array antennal RCS is stressly studied based o...
In order to satisfy some special demands for detection and recognition to the guiding radar of Air Defense Missile Weapon System (ADMWS) using an active radar seeker, an analysis method of planar slotted array antennal RCS is stressly studied based o...
2008, 30(10): 2347-2351.
doi: 10.3724/SP.J.1146.2007.00346
Abstract:
A new feature selection algorithm is presented using SVM, and then it is integrated into the classification procedure of polarimetric SAR images to construct a novel SVM-based classification method. In the novel method, the sequential backward select...
A new feature selection algorithm is presented using SVM, and then it is integrated into the classification procedure of polarimetric SAR images to construct a novel SVM-based classification method. In the novel method, the sequential backward select...
2008, 30(10): 2352-2355.
doi: 10.3724/SP.J.1146.2007.00469
Abstract:
In order to store MODIS multispectral images effectively, a new hybrid compression algorithm based on optimal inter-band prediction and integer wavelet transform is proposed. First, an optimal inter-band predictor is designed for de-correlating the s...
In order to store MODIS multispectral images effectively, a new hybrid compression algorithm based on optimal inter-band prediction and integer wavelet transform is proposed. First, an optimal inter-band predictor is designed for de-correlating the s...
2008, 30(10): 2356-2359.
doi: 10.3724/SP.J.1146.2007.00482
Abstract:
Threshold denoising in wavelet domain is an efficient method to reduce the white noise which is easy to program, so that it is widely applied to the image and signal denoising. According to the wavelet transformation characteristic of the MMV target ...
Threshold denoising in wavelet domain is an efficient method to reduce the white noise which is easy to program, so that it is widely applied to the image and signal denoising. According to the wavelet transformation characteristic of the MMV target ...
2008, 30(10): 2360-2363.
doi: 10.3724/SP.J.1146.2007.00419
Abstract:
A parallel algorithm via Element Level Vector Finite Element Method(ELVFEM) and Adaptive Multilevel Fast Multipole Algorithm(AMLFMA) is introduced. In this algorithm the calculation of finite element method can be finished at elementary level and no ...
A parallel algorithm via Element Level Vector Finite Element Method(ELVFEM) and Adaptive Multilevel Fast Multipole Algorithm(AMLFMA) is introduced. In this algorithm the calculation of finite element method can be finished at elementary level and no ...
2008, 30(10): 2364-2368.
doi: 10.3724/SP.J.1146.2007.00540
Abstract:
In this paper, an Adaptively Modified Characteristic Basis Function Method (AMCBFM) based on partitioning object geometry into blocks is proposed. Firstly, the primary CBFs arising from the self-interaction within the self-block are generated, then t...
In this paper, an Adaptively Modified Characteristic Basis Function Method (AMCBFM) based on partitioning object geometry into blocks is proposed. Firstly, the primary CBFs arising from the self-interaction within the self-block are generated, then t...
2008, 30(10): 2369-2372.
doi: 10.3724/SP.J.1146.2007.00380
Abstract:
This paper introduces a new family of cost function for blind equalization. This cost function family has clear mathematic meanings. This cost function includes the well-know Decision-Directed algorithm, Sato algorithm, CMA algorithm and its mutation...
This paper introduces a new family of cost function for blind equalization. This cost function family has clear mathematic meanings. This cost function includes the well-know Decision-Directed algorithm, Sato algorithm, CMA algorithm and its mutation...
2008, 30(10): 2373-2376.
doi: 10.3724/SP.J.1146.2007.00582
Abstract:
A novel Volterra equalizer based on minimum bit error rate principle is proposed in this paper for interference suppression in communications. The Volterra kernels are estimated based on minimum bit error rate principle and this is different from the...
A novel Volterra equalizer based on minimum bit error rate principle is proposed in this paper for interference suppression in communications. The Volterra kernels are estimated based on minimum bit error rate principle and this is different from the...
2008, 30(10): 2377-2380.
doi: 10.3724/SP.J.1146.2007.01261
Abstract:
Block prefix is usually added in block transmission system for facilitating channel identification. With cyclic prefix, the channel matrix exhibits block circulant property which is exploited to blindly identify periodically modulated block transmiss...
Block prefix is usually added in block transmission system for facilitating channel identification. With cyclic prefix, the channel matrix exhibits block circulant property which is exploited to blindly identify periodically modulated block transmiss...
2008, 30(10): 2381-2383.
doi: 10.3724/SP.J.1146.2007.00749
Abstract:
In this paper, a novel blind channel estimation algorithm based on tap detecting is proposed for the chip-rate discrete channel of the TH-PPM Ultra Wide-Band(UWB) communications. In this algorithm, the cyclic convolution property of the receive signa...
In this paper, a novel blind channel estimation algorithm based on tap detecting is proposed for the chip-rate discrete channel of the TH-PPM Ultra Wide-Band(UWB) communications. In this algorithm, the cyclic convolution property of the receive signa...
2008, 30(10): 2384-2387.
doi: 10.3724/SP.J.1146.2007.00526
Abstract:
Quasi Cyclic LDPC (QC-LDPC) codes are of particular interest in various areas. In this paper, a method to construct a class of QC-LDPC codes based on circulant permutation matrices is showed. The method chooses the position of each non-zero sub-matri...
Quasi Cyclic LDPC (QC-LDPC) codes are of particular interest in various areas. In this paper, a method to construct a class of QC-LDPC codes based on circulant permutation matrices is showed. The method chooses the position of each non-zero sub-matri...
2008, 30(10): 2388-2391.
doi: 10.3724/SP.J.1146.2007.00503
Abstract:
A general structure of CSS-type quantum convolutional codes is presented. The standard form of stabilizers, operators and operators are also given. Encoding and decoding of the codes are discussed with emphasis and corresponding networks are describe...
A general structure of CSS-type quantum convolutional codes is presented. The standard form of stabilizers, operators and operators are also given. Encoding and decoding of the codes are discussed with emphasis and corresponding networks are describe...
2008, 30(10): 2392-2396.
doi: 10.3724/SP.J.1146.2007.00491
Abstract:
A turbo-type scheme that uses parallel concatenation and Turbo Block Decision Feedback Equalization (TBDFE) is proposed for transmission over linear intersymbol interference channels. The scheme can offer significant improvement in performance. Howev...
A turbo-type scheme that uses parallel concatenation and Turbo Block Decision Feedback Equalization (TBDFE) is proposed for transmission over linear intersymbol interference channels. The scheme can offer significant improvement in performance. Howev...
2008, 30(10): 2397-2401.
doi: 10.3724/SP.J.1146.2007.00390
Abstract:
This paper presents an improved maximum a posteriori probability (MAP) decoding algorithm for optimal decoding of parallel concatenated convolutional codes (Turbo codes). Compared with the Log-MAP algorithms based on logarithm domain, the proposed al...
This paper presents an improved maximum a posteriori probability (MAP) decoding algorithm for optimal decoding of parallel concatenated convolutional codes (Turbo codes). Compared with the Log-MAP algorithms based on logarithm domain, the proposed al...
2008, 30(10): 2402-2406.
doi: 10.3724/SP.J.1146.2007.01970
Abstract:
Research on roaming management is a very important part for mobile multimedia broadcasting services. However, both OMA (Open Mobile Alliance) and 3GPP (3rd Generation Partnership Project) just give a brief description without further study, all of th...
Research on roaming management is a very important part for mobile multimedia broadcasting services. However, both OMA (Open Mobile Alliance) and 3GPP (3rd Generation Partnership Project) just give a brief description without further study, all of th...
2008, 30(10): 2407-2410.
doi: 10.3724/SP.J.1146.2007.00411
Abstract:
To address the problem that TCP performance degrades significantly on the Satellite communication networks, a new transport control protocol, TP-Satellite is introduced. In order to increase the Congestion Window (cwnd) rapidly at the beginning of da...
To address the problem that TCP performance degrades significantly on the Satellite communication networks, a new transport control protocol, TP-Satellite is introduced. In order to increase the Congestion Window (cwnd) rapidly at the beginning of da...
2008, 30(10): 2411-2414.
doi: 10.3724/SP.J.1146.2007.00471
Abstract:
A LEO global traffic model is first built, then four access and handoff strategies for LEO satellite communication are proposed, and these strategies performance, including call blocking probability and call termination probability, is evaluated thro...
A LEO global traffic model is first built, then four access and handoff strategies for LEO satellite communication are proposed, and these strategies performance, including call blocking probability and call termination probability, is evaluated thro...
2008, 30(10): 2415-2418.
doi: 10.3724/SP.J.1146.2007.00560
Abstract:
In Orthogonal Frequency Division Multiplexing (OFDM) systems, there are large estimate errors of the received power in a traditional Automatic Gain Control (AGC). This paper proposes a distribution-function-based AGC method. This method estimates the...
In Orthogonal Frequency Division Multiplexing (OFDM) systems, there are large estimate errors of the received power in a traditional Automatic Gain Control (AGC). This paper proposes a distribution-function-based AGC method. This method estimates the...
2008, 30(10): 2419-2422.
doi: 10.3724/SP.J.1146.2007.00487
Abstract:
A non-unitary precoding system based on codebook for multi-user MIMO downlink transmission with limited feedback is proposed in this paper. The proposed scheme will perform scheduling and precoding just according to the limited feedback channel infor...
A non-unitary precoding system based on codebook for multi-user MIMO downlink transmission with limited feedback is proposed in this paper. The proposed scheme will perform scheduling and precoding just according to the limited feedback channel infor...
2008, 30(10): 2423-2426.
doi: 10.3724/SP.J.1146.2007.00553
Abstract:
High data rates and high mobility-induced Doppler shifts introduce time- and frequency-selectivity in wireless links. Recently, doubly selective channel estimation has attracted much attention. In this paper, using a basis expansion channel model, a ...
High data rates and high mobility-induced Doppler shifts introduce time- and frequency-selectivity in wireless links. Recently, doubly selective channel estimation has attracted much attention. In this paper, using a basis expansion channel model, a ...
2008, 30(10): 2427-2430.
doi: 10.3724/SP.J.1146.2007.00554
Abstract:
A new method of calculating the angle parameter in FRFT domain based on the eigenfunction of time-varying channel is proposed in this letter for FRFT-OFDM systems. The new scheme can estimate the angle parameter in real time based on the variation of...
A new method of calculating the angle parameter in FRFT domain based on the eigenfunction of time-varying channel is proposed in this letter for FRFT-OFDM systems. The new scheme can estimate the angle parameter in real time based on the variation of...
2008, 30(10): 2431-2434.
doi: 10.3724/SP.J.1146.2007.00523
Abstract:
To exploit multi-user diversity for multi-user MIMO system, a scheduling algorithm is proposed based on one-bit feedback information in this paper. It is proved in this paper that the value of threshold is important for the system performance, and th...
To exploit multi-user diversity for multi-user MIMO system, a scheduling algorithm is proposed based on one-bit feedback information in this paper. It is proved in this paper that the value of threshold is important for the system performance, and th...
2008, 30(10): 2435-2438.
doi: 10.3724/SP.J.1146.2007.00495
Abstract:
Cognitive UWB technology combines UWB technology and Cognitive Radio (CR) technology. Spectrum detection is one of key modules for Cognitive UWB wireless communication system. Cyclostationary characteristic is ubiquitous in almost all the modulated s...
Cognitive UWB technology combines UWB technology and Cognitive Radio (CR) technology. Spectrum detection is one of key modules for Cognitive UWB wireless communication system. Cyclostationary characteristic is ubiquitous in almost all the modulated s...
2008, 30(10): 2439-2441.
doi: 10.3724/SP.J.1146.2007.00494
Abstract:
In this paper, the relation between anti-interferences performances of Transform Domain Communication System(TDCS) and basis functions relational parameters are analyzed theoretically; a method of interferences mitigation one by one based on RAT+FRFT...
In this paper, the relation between anti-interferences performances of Transform Domain Communication System(TDCS) and basis functions relational parameters are analyzed theoretically; a method of interferences mitigation one by one based on RAT+FRFT...
2008, 30(10): 2442-2445.
doi: 10.3724/SP.J.1146.2007.00397
Abstract:
The purpose of the paper is to optimize the pilot symbols in adaptive pilot symbols assisted coded modulation systems and to study the influences of the new algorithm on the whole system performances. A new algorithm is found to determine the interva...
The purpose of the paper is to optimize the pilot symbols in adaptive pilot symbols assisted coded modulation systems and to study the influences of the new algorithm on the whole system performances. A new algorithm is found to determine the interva...
2008, 30(10): 2446-2449.
doi: 10.3724/SP.J.1146.2007.00443
Abstract:
A new combined symbol timing and frequency synchronization and channel estimation technique by using the detected data is developed for OFDM systems. Open-loop and closed-loop schemes are described in details. The synchronization information containe...
A new combined symbol timing and frequency synchronization and channel estimation technique by using the detected data is developed for OFDM systems. Open-loop and closed-loop schemes are described in details. The synchronization information containe...
2008, 30(10): 2450-2453.
doi: 10.3724/SP.J.1146.2007.00576
Abstract:
To solve the direction-finding and communication of the micro aerial vehicle in peculiar environment, a new communication and tracking system is proposed. The main idea of this system is that the space-time OFDM signal carrying spatial information is...
To solve the direction-finding and communication of the micro aerial vehicle in peculiar environment, a new communication and tracking system is proposed. The main idea of this system is that the space-time OFDM signal carrying spatial information is...
2008, 30(10): 2454-2458.
doi: 10.3724/SP.J.1146.2007.00378
Abstract:
Antenna Selection (AS) technique and Virtual MIMO(VMIMO) technique have been widely used in uplink transmission, where the User Equipment (UE) has two antennas but only one Radio Frequency (RF) link. With a view to fully take the advantages of these ...
Antenna Selection (AS) technique and Virtual MIMO(VMIMO) technique have been widely used in uplink transmission, where the User Equipment (UE) has two antennas but only one Radio Frequency (RF) link. With a view to fully take the advantages of these ...
2008, 30(10): 2459-2463.
doi: 10.3724/SP.J.1146.2007.00533
Abstract:
According to the algebraic expression of the S-box in Rijndael algorithm, an algebraic system of multivariate quadratic equations over GF(28) are proposed to describe Rijndael. The variables of S boxes are supposed rationally and the relations betwee...
According to the algebraic expression of the S-box in Rijndael algorithm, an algebraic system of multivariate quadratic equations over GF(28) are proposed to describe Rijndael. The variables of S boxes are supposed rationally and the relations betwee...
2008, 30(10): 2464-2467.
doi: 10.3724/SP.J.1146.2007.00470
Abstract:
Based on the back tracking method and the correlation between input and output of the feedforward function, a new inversion attack is proposed to the feedforward stream cipher model with a linear feedback shift register based on a multiplication circ...
Based on the back tracking method and the correlation between input and output of the feedforward function, a new inversion attack is proposed to the feedforward stream cipher model with a linear feedback shift register based on a multiplication circ...
2008, 30(10): 2468-2471.
doi: 10.3724/SP.J.1146.2007.00423
Abstract:
According to the problems of proxy revocation, original signers forgery and proxy misuse in proxy signature, a secure proxy blind signature scheme with proxy revocation is proposed. In phase of signature, by embedding non-blind time-stamp in the Abe-...
According to the problems of proxy revocation, original signers forgery and proxy misuse in proxy signature, a secure proxy blind signature scheme with proxy revocation is proposed. In phase of signature, by embedding non-blind time-stamp in the Abe-...
2008, 30(10): 2472-2475.
doi: 10.3724/SP.J.1146.2007.00486
Abstract:
Many of the existing proposed routing protocols could not give well stability and reliability and not fit in the needs for Ad hoc network. Because of the problems of great overhead and the lower stability in Ad hoc routing technology, an improved ant...
Many of the existing proposed routing protocols could not give well stability and reliability and not fit in the needs for Ad hoc network. Because of the problems of great overhead and the lower stability in Ad hoc routing technology, an improved ant...
2008, 30(10): 2476-2480.
doi: 10.3724/SP.J.1146.2007.00463
Abstract:
The cross-layer adaptive problem for OFDM systems is researched. In order to overcome the problem that the present resource allocation algorithms do not consider frequency efficiency, impartiality and QoS simultaneously, a cross-layer adaptive algori...
The cross-layer adaptive problem for OFDM systems is researched. In order to overcome the problem that the present resource allocation algorithms do not consider frequency efficiency, impartiality and QoS simultaneously, a cross-layer adaptive algori...
2008, 30(10): 2481-2485.
doi: 10.3724/SP.J.1146.2007.00359
Abstract:
The Instant Messaging inter-working model based on Petri nets is set up to verify the mapping between SIMPLE and IMPS by a new universal coupling criteria of Petri nets model. After the strict mathematical analysis and verification for the model, whi...
The Instant Messaging inter-working model based on Petri nets is set up to verify the mapping between SIMPLE and IMPS by a new universal coupling criteria of Petri nets model. After the strict mathematical analysis and verification for the model, whi...
2008, 30(10): 2486-2489.
doi: 10.3724/SP.J.1146.2007.00478
Abstract:
A typical flow for SIP message exchange is studied, reasons that cause performance degradation are mainly analyzed, and an optimized algorithm that randomly makes the decision of acceptance or rejection of every packet is proposed for overload contro...
A typical flow for SIP message exchange is studied, reasons that cause performance degradation are mainly analyzed, and an optimized algorithm that randomly makes the decision of acceptance or rejection of every packet is proposed for overload contro...
2008, 30(10): 2490-2493.
doi: 10.3724/SP.J.1146.2007.00460
Abstract:
Major defensive mechanisms against DoS attacks in the Internet are reviewed. Especially the most recent capabilities techniques, such as basic concepts, stateless flow filtering and the Traffic Validation Architecture (TVA), are analyzed deeply. The ...
Major defensive mechanisms against DoS attacks in the Internet are reviewed. Especially the most recent capabilities techniques, such as basic concepts, stateless flow filtering and the Traffic Validation Architecture (TVA), are analyzed deeply. The ...
2008, 30(10): 2494-2498.
doi: 10.3724/SP.J.1146.2007.00459
Abstract:
Wireless sensor networks congestion often leads to increasing network latency, decreasing throughput and wasting the limited sensor node energy. In this paper, an energy-efficient congestion control scheme, which can alleviate congestion in wireless ...
Wireless sensor networks congestion often leads to increasing network latency, decreasing throughput and wasting the limited sensor node energy. In this paper, an energy-efficient congestion control scheme, which can alleviate congestion in wireless ...
2008, 30(10): 2499-2502.
doi: 10.3724/SP.J.1146.2007.00451
Abstract:
In this paper, a WAN network traffic prediction model based on wavelet transform and FIR neural networks is proposed. The model employs wavelet transform which decomposes the traffic into high frequency coefficients and low frequency coefficients , t...
In this paper, a WAN network traffic prediction model based on wavelet transform and FIR neural networks is proposed. The model employs wavelet transform which decomposes the traffic into high frequency coefficients and low frequency coefficients , t...
2008, 30(10): 2503-2506.
doi: 10.3724/SP.J.1146.2007.00562
Abstract:
This paper proposed a new algorithm called K2K (KPI to KQI) based on algorithm which had been proposed by TMF (Telemanagement Forum) proposes a general algorithm about how to map the key performance indicator (KPI) to the key quality indicator (KQI)....
This paper proposed a new algorithm called K2K (KPI to KQI) based on algorithm which had been proposed by TMF (Telemanagement Forum) proposes a general algorithm about how to map the key performance indicator (KPI) to the key quality indicator (KQI)....
2008, 30(10): 2507-2511.
doi: 10.3724/SP.J.1146.2007.00360
Abstract:
TPR-tree is the most popular indexing method for the current and future position of moving objects. In this paper, a new indexing method, ETPR-tree, which takes into account the distribution of both velocity domain and space domain is presented. Firs...
TPR-tree is the most popular indexing method for the current and future position of moving objects. In this paper, a new indexing method, ETPR-tree, which takes into account the distribution of both velocity domain and space domain is presented. Firs...
2008, 30(10): 2512-2515.
doi: 10.3724/SP.J.1146.2007.00493
Abstract:
A new document relevance calculating method based on lexical cohesion is presented in this paper. The main principle is: documents are formalized with lexicon chains which are constructed by extracting semantic-relative word clusters according to the...
A new document relevance calculating method based on lexical cohesion is presented in this paper. The main principle is: documents are formalized with lexicon chains which are constructed by extracting semantic-relative word clusters according to the...
2008, 30(10): 2516-2519.
doi: 10.3724/SP.J.1146.2007.00552
Abstract:
Based on the analysis of the Empirical Mode Decomposition (EMD) method, an improved algorithm for signal processing in IR optical gas detection is presented. It decomposes only frequency-modulated signal without need to decompose every Intrinsic Mode...
Based on the analysis of the Empirical Mode Decomposition (EMD) method, an improved algorithm for signal processing in IR optical gas detection is presented. It decomposes only frequency-modulated signal without need to decompose every Intrinsic Mode...
2008, 30(10): 2520-2524.
doi: 10.3724/SP.J.1146.2007.00479
Abstract:
HFSS is used to simulate helical, contrawound helix and coupled-cavity Slow-Wave Structures(SWS), which work in Ka-band, to investigate the backward-wave oscillation of millimeter-wave TWT. The results show that, space harmonics, which axial space ha...
HFSS is used to simulate helical, contrawound helix and coupled-cavity Slow-Wave Structures(SWS), which work in Ka-band, to investigate the backward-wave oscillation of millimeter-wave TWT. The results show that, space harmonics, which axial space ha...
2008, 30(10): 2525-2528.
doi: 10.3724/SP.J.1146.2007.00550
Abstract:
Approximated Maximum Likelihood (AML) estimator has been shown to be the best performance in short sampling wideband sources DOA estimation. However, the computation burden of AML is very large. In order to resolve the question of computation burden,...
Approximated Maximum Likelihood (AML) estimator has been shown to be the best performance in short sampling wideband sources DOA estimation. However, the computation burden of AML is very large. In order to resolve the question of computation burden,...
2008, 30(10): 2529-2532.
doi: 10.3724/SP.J.1146.2007.00383
Abstract:
Since the frequency stability of radio transmitter is high, the error of the carrier frequency is very small, and it is hard to obtain the individual stability difference using traditional approaches due to their low frequency extraction precision. I...
Since the frequency stability of radio transmitter is high, the error of the carrier frequency is very small, and it is hard to obtain the individual stability difference using traditional approaches due to their low frequency extraction precision. I...
2008, 30(10): 2533-2536.
doi: 10.3724/SP.J.1146.2007.00546
Abstract:
How to deploy efficiently sonobuoys is important in air ASW. The Genetic Algorithm(GA) is applied to sonobuoys deployment with reasonable crossover, mutation and the fitness function. A simulation is present to compare detection probability of sonobu...
How to deploy efficiently sonobuoys is important in air ASW. The Genetic Algorithm(GA) is applied to sonobuoys deployment with reasonable crossover, mutation and the fitness function. A simulation is present to compare detection probability of sonobu...
2008, 30(10): 2537-2540.
doi: 10.3724/SP.J.1146.2007.01490
Abstract:
This paper proposes one channel estimation scheme for multiuser MC DS-CDMA systems. Based on the averaged channel estimation in time domain, the averaged channel estimation in frequency domain is used to improve further the performance of channel est...
This paper proposes one channel estimation scheme for multiuser MC DS-CDMA systems. Based on the averaged channel estimation in time domain, the averaged channel estimation in frequency domain is used to improve further the performance of channel est...
