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2006 Vol. 28, No. 5
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2006, 28(5): 769-773.
Abstract:
A random early expiration detection based buffer management algorithm is proposed for real-time traffic over wireless networks. Considering the characters of wireless link such as variable channel condition and transmission error, the algorithm is co...
A random early expiration detection based buffer management algorithm is proposed for real-time traffic over wireless networks. Considering the characters of wireless link such as variable channel condition and transmission error, the algorithm is co...
2006, 28(5): 774-779.
Abstract:
An admission control algorithm with deterministic delay guarantees in DiffServ networks, Service Admission Control in DiffServ (SACiD), is developed in this paper. It can not only prevent the end-to-end delay of admitted services from violating the a...
An admission control algorithm with deterministic delay guarantees in DiffServ networks, Service Admission Control in DiffServ (SACiD), is developed in this paper. It can not only prevent the end-to-end delay of admitted services from violating the a...
2006, 28(5): 780-784.
Abstract:
In Ad hoc networks, low reliability of wireless link makes the scalability of multicast group degrade drastically, and FEC(Forward Error Correction) technique and NACK(Negative ACKnowledgement)-based mechanism, which guarantees reliable transport of ...
In Ad hoc networks, low reliability of wireless link makes the scalability of multicast group degrade drastically, and FEC(Forward Error Correction) technique and NACK(Negative ACKnowledgement)-based mechanism, which guarantees reliable transport of ...
2006, 28(5): 785-788.
Abstract:
A topology-transparent Time Division Multiple Access (TDMA) with reservation for MIMO link is proposed for multi-hop Ad hoc networks in this paper. By reservation each node transmits simultaneously all data streams in its assigned collision-free slot...
A topology-transparent Time Division Multiple Access (TDMA) with reservation for MIMO link is proposed for multi-hop Ad hoc networks in this paper. By reservation each node transmits simultaneously all data streams in its assigned collision-free slot...
2006, 28(5): 789-794.
Abstract:
A fair and efficient bandwidth allocation scheduling architecture for IEEE 802.16 Broadband Wireless Access (BWA) systems in TDD mode is proposed. In this area, comparing with the traditional fixed bandwidth allocation, the proposed scheduling archit...
A fair and efficient bandwidth allocation scheduling architecture for IEEE 802.16 Broadband Wireless Access (BWA) systems in TDD mode is proposed. In this area, comparing with the traditional fixed bandwidth allocation, the proposed scheduling archit...
2006, 28(5): 795-799.
Abstract:
This paper studies the media access control protocol and key technologies in ultra-wideband wireless networks. It is mainly analyzed that the basic principle of IEEE 802.15.3 media access control protocol which is as one of the most suitable protocol...
This paper studies the media access control protocol and key technologies in ultra-wideband wireless networks. It is mainly analyzed that the basic principle of IEEE 802.15.3 media access control protocol which is as one of the most suitable protocol...
2006, 28(5): 800-804.
Abstract:
Taking into account the features of satellite networking，solving the measurement for traffic in satellite networks by adopting passive measurement method based on SNMP is studied in this paper. The principle of measurement for network traffic using S...
Taking into account the features of satellite networking，solving the measurement for traffic in satellite networks by adopting passive measurement method based on SNMP is studied in this paper. The principle of measurement for network traffic using S...
2006, 28(5): 805-809.
Abstract:
Traditional input-queued switches based on crossbar are insufficient in providing good QoS performance. As a contrast, the CICQ(Combined Input and Cross-point buffered Queuing) switches can provide almost 100% throughput under different input traffic...
Traditional input-queued switches based on crossbar are insufficient in providing good QoS performance. As a contrast, the CICQ(Combined Input and Cross-point buffered Queuing) switches can provide almost 100% throughput under different input traffic...
2006, 28(5): 810-814.
Abstract:
To improve the Binary Exponential Backoff algorithm (BEB)s channel throughput of IEEE 802.11 protocol, a novel Collision Reduced Multiple Access protocol (CRMA) is proposed based on slow contention window decrease mechanism and runtime optimization m...
To improve the Binary Exponential Backoff algorithm (BEB)s channel throughput of IEEE 802.11 protocol, a novel Collision Reduced Multiple Access protocol (CRMA) is proposed based on slow contention window decrease mechanism and runtime optimization m...
2006, 28(5): 815-819.
Abstract:
As a kind of dynamic self-organized network, wireless Ad hoc network is faced with serious security threat. On the basis of analyzing the characteristics of Ad hoc network, a hierarchical group key management solution (Hierarchical Group Controller-B...
As a kind of dynamic self-organized network, wireless Ad hoc network is faced with serious security threat. On the basis of analyzing the characteristics of Ad hoc network, a hierarchical group key management solution (Hierarchical Group Controller-B...
2006, 28(5): 820-822.
Abstract:
Based on group signature scheme from bilinear pairings, a new offline fair cash scheme is presented. Because of setting up on the elliptic curve group and without using blind signature scheme , this scheme has many properties such as having simple st...
Based on group signature scheme from bilinear pairings, a new offline fair cash scheme is presented. Because of setting up on the elliptic curve group and without using blind signature scheme , this scheme has many properties such as having simple st...
2006, 28(5): 823-826.
Abstract:
A multi-signature scheme is a digital signature scheme that allow multiple signers to generate in a collaborative and simultaneous manner. In the application of multi-signature, the signing order among co-signers may satisfy a special sequence and so...
A multi-signature scheme is a digital signature scheme that allow multiple signers to generate in a collaborative and simultaneous manner. In the application of multi-signature, the signing order among co-signers may satisfy a special sequence and so...
2006, 28(5): 827-831.
Abstract:
A correlation attack on A5/1 algorithm can be educed by the linear filling weakness in initiate process of A5/1 algorithm. An aberrant A5/1 sequence can be obtained from it, which have treated by statistic tools to get A5/1 statistic trait, so the di...
A correlation attack on A5/1 algorithm can be educed by the linear filling weakness in initiate process of A5/1 algorithm. An aberrant A5/1 sequence can be obtained from it, which have treated by statistic tools to get A5/1 statistic trait, so the di...
2006, 28(5): 832-835.
Abstract:
Towards making the construction method on the DES-model pseudorandom permutations given by Luby and Rackoff optimal and practical, a new construction method on pseudorandom permutations is provided. Based on the random oracle model by showing that tw...
Towards making the construction method on the DES-model pseudorandom permutations given by Luby and Rackoff optimal and practical, a new construction method on pseudorandom permutations is provided. Based on the random oracle model by showing that tw...
2006, 28(5): 836-839.
Abstract:
The VV algorithm is very suitable for carrier synchronization of burst signal. After VV algorithm, a post processing is needed for eliminating the phase equivocation which is brought by the residual frequency and the cycle slip can be avoided. In thi...
The VV algorithm is very suitable for carrier synchronization of burst signal. After VV algorithm, a post processing is needed for eliminating the phase equivocation which is brought by the residual frequency and the cycle slip can be avoided. In thi...
2006, 28(5): 840-843.
Abstract:
This paper presents a new combined algorithm based on FFT for frame synchronization and frequency offset estimation. The algorithm can achieve frame synchronization effectively in the presence of a frequency offset and the frequency offset estimation...
This paper presents a new combined algorithm based on FFT for frame synchronization and frequency offset estimation. The algorithm can achieve frame synchronization effectively in the presence of a frequency offset and the frequency offset estimation...
2006, 28(5): 844-847.
Abstract:
A novel image coding algorithm based on coefficients of interest is proposed in terms of the special needs of remote-sensing images. When coding rate is given, the entropy estimate is calculated from the coefficients of the given image, so that the l...
A novel image coding algorithm based on coefficients of interest is proposed in terms of the special needs of remote-sensing images. When coding rate is given, the entropy estimate is calculated from the coefficients of the given image, so that the l...
2006, 28(5): 848-851.
Abstract:
An optimized approach based on texture synthesis for filling-in blocks of missing data is presented in this paper. According to coarseness analysis and the character of inpainting algorithm, parts of image blocks would be dropped purposively. And the...
An optimized approach based on texture synthesis for filling-in blocks of missing data is presented in this paper. According to coarseness analysis and the character of inpainting algorithm, parts of image blocks would be dropped purposively. And the...
2006, 28(5): 852-856.
Abstract:
Orthogonal Hermite pulse shapes used for Ultra Wide-Band(UWB) communication are proposed. The paper presents a novel method for multi-user transmission system in UWB communication. By transmitting multiple orthogonal Hermite pulses simultaneously, th...
Orthogonal Hermite pulse shapes used for Ultra Wide-Band(UWB) communication are proposed. The paper presents a novel method for multi-user transmission system in UWB communication. By transmitting multiple orthogonal Hermite pulses simultaneously, th...
2006, 28(5): 857-860.
Abstract:
Successive Interference Cancellation (SIC) can effectively mitigate Multiple Access Interference (MAI) and improve the capacity of Direct-Sequence Code-Division Multiple Access (DS-CDMA) systems. In this paper, for the uplink of a single cell DS-CDMA...
Successive Interference Cancellation (SIC) can effectively mitigate Multiple Access Interference (MAI) and improve the capacity of Direct-Sequence Code-Division Multiple Access (DS-CDMA) systems. In this paper, for the uplink of a single cell DS-CDMA...
2006, 28(5): 861-864.
Abstract:
This paper focuses on the geometrical properties of Inter-Satellite Links (ISLs) of the small satellites formation flying under the elliptical orbits, including the azimuth, elevation and the distance. The article addresses the mathematical formula f...
This paper focuses on the geometrical properties of Inter-Satellite Links (ISLs) of the small satellites formation flying under the elliptical orbits, including the azimuth, elevation and the distance. The article addresses the mathematical formula f...
2006, 28(5): 865-870.
Abstract:
Based on the functionality and traffic characteristics of the Medium Earth Orbit Tracking and Data Relay Satellite System(MEO-TDRSS), the coverage properties and Inter-Satellite Link(ISL) performances of four familiar satellite constellation schemes ...
Based on the functionality and traffic characteristics of the Medium Earth Orbit Tracking and Data Relay Satellite System(MEO-TDRSS), the coverage properties and Inter-Satellite Link(ISL) performances of four familiar satellite constellation schemes ...
2006, 28(5): 871-874.
Abstract:
High data transmission rates and high mobility give rise to time selectivity and frequency selectivity in wireless communication channels. This paper investigates Multi-Input Multi-Output (MIMO) time and frequency doubly selective channel estimation ...
High data transmission rates and high mobility give rise to time selectivity and frequency selectivity in wireless communication channels. This paper investigates Multi-Input Multi-Output (MIMO) time and frequency doubly selective channel estimation ...
2006, 28(5): 875-878.
Abstract:
This paper present a new DOA estimation algorithm in impulsive noise environment. The algorithm uses firstly screened ratio principle to construct the correlation matrix of the array data and then implements the DOA estimation by MUSIC algorithm. In ...
This paper present a new DOA estimation algorithm in impulsive noise environment. The algorithm uses firstly screened ratio principle to construct the correlation matrix of the array data and then implements the DOA estimation by MUSIC algorithm. In ...
2006, 28(5): 879-882.
Abstract:
This paper presents a decoupled maximum likelihood(ML) detection algorithm, which utilizes the orthogonal characteristic of signal, decoupled the combined ML detection into separated one, under the assumption that CSI is known at the receiver. Utiliz...
This paper presents a decoupled maximum likelihood(ML) detection algorithm, which utilizes the orthogonal characteristic of signal, decoupled the combined ML detection into separated one, under the assumption that CSI is known at the receiver. Utiliz...
2006, 28(5): 883-889.
Abstract:
The updated image fusion schemes could not identify meaningful image features from noises, the input noise is treated as valid information and transferred into the fused output. After complex wavelet transformation (CWT), structured information is de...
The updated image fusion schemes could not identify meaningful image features from noises, the input noise is treated as valid information and transferred into the fused output. After complex wavelet transformation (CWT), structured information is de...
2006, 28(5): 890-894.
Abstract:
A novel algorithm for image inpainting based on Compactly Supported Radial Basis Functions(CSRBF) interpolation is proposed. The algorithm looks an image as an incomplete 3D points set. The 2D image inpainting problem is converted into implicit surfa...
A novel algorithm for image inpainting based on Compactly Supported Radial Basis Functions(CSRBF) interpolation is proposed. The algorithm looks an image as an incomplete 3D points set. The 2D image inpainting problem is converted into implicit surfa...
2006, 28(5): 895-900.
Abstract:
A method to identify Chinese organization names by utilizing SVM (Support Vector Machines) and RS (Rough Set) is provided. Forming rule of organization name is defined based on semanteme collocation relation, and then the un-redundancy set of rough f...
A method to identify Chinese organization names by utilizing SVM (Support Vector Machines) and RS (Rough Set) is provided. Forming rule of organization name is defined based on semanteme collocation relation, and then the un-redundancy set of rough f...
2006, 28(5): 901-904.
Abstract:
A new algorithm of mixed noise removal for digital image is presented combing median filter and fuzzy technology. The pixels of an image are divided into two sets: impulse noise points and pixels polluted by Gaussian noise. The min-max operator is us...
A new algorithm of mixed noise removal for digital image is presented combing median filter and fuzzy technology. The pixels of an image are divided into two sets: impulse noise points and pixels polluted by Gaussian noise. The min-max operator is us...
2006, 28(5): 905-908.
Abstract:
According to Hilbert-Huang Transform (HHT) theory, the signals Intrinsic Mode Function (IMF) is extracted by Empirical Mode Decomposition (EMD). Its time-frequency-amplitude spectrum and marginal spectrum are obtained by Hilbert transform. In the bas...
According to Hilbert-Huang Transform (HHT) theory, the signals Intrinsic Mode Function (IMF) is extracted by Empirical Mode Decomposition (EMD). Its time-frequency-amplitude spectrum and marginal spectrum are obtained by Hilbert transform. In the bas...
2006, 28(5): 909-914.
Abstract:
The issue of Direction-Of-Arrival (DOA) estimation in multiple subarrays is addressed. It is assumed that an array is composed of several uniform linear arrays (ULAs) of arbitrary known geometry, but there are mutual coupling between sensors of each ...
The issue of Direction-Of-Arrival (DOA) estimation in multiple subarrays is addressed. It is assumed that an array is composed of several uniform linear arrays (ULAs) of arbitrary known geometry, but there are mutual coupling between sensors of each ...
2006, 28(5): 915-918.
Abstract:
To reduce the loss of sampling, higher sampling frequency than bandwidth of chirp must be adopted for Modulated Frequency Stepped Pulse(MFSP) radar signal, which will bring on over-sampling result of pulse compression for chirp. So the pick-up algori...
To reduce the loss of sampling, higher sampling frequency than bandwidth of chirp must be adopted for Modulated Frequency Stepped Pulse(MFSP) radar signal, which will bring on over-sampling result of pulse compression for chirp. So the pick-up algori...
2006, 28(5): 919-922.
Abstract:
The advantages of wavelet transform constructed with lifting scheme are introduced and compression algorithm based on lifting wavelet for SAR raw data is proposed. Compression performance of the algorithm is analyzed with simulation and real raw data...
The advantages of wavelet transform constructed with lifting scheme are introduced and compression algorithm based on lifting wavelet for SAR raw data is proposed. Compression performance of the algorithm is analyzed with simulation and real raw data...
2006, 28(5): 923-926.
Abstract:
The effect of the range migration to the Shift-And-Correlate Monopulse Secondary Surbeillause Redar (SAC) algorithm is analyzed in this paper. The conclusion is that the precision of SAC would be severely affected by the range migration in the high r...
The effect of the range migration to the Shift-And-Correlate Monopulse Secondary Surbeillause Redar (SAC) algorithm is analyzed in this paper. The conclusion is that the precision of SAC would be severely affected by the range migration in the high r...
2006, 28(5): 927-931.
Abstract:
The SAR working mode of range multi-aperture is a high resolution imaging mode for wide swath. Resolving and imaging are the two parts of range multi-aperture imaging algorithm. How to match the two parts together is the key problem for the algorithm...
The SAR working mode of range multi-aperture is a high resolution imaging mode for wide swath. Resolving and imaging are the two parts of range multi-aperture imaging algorithm. How to match the two parts together is the key problem for the algorithm...
2006, 28(5): 932-935.
Abstract:
The multiplicative nature of the speckle noise in SAR images is a big problem in SAR image segmentation. A novel method for automatic segmentation of SAR images is proposed. The wavelet energy is used to extract texture features, the regional statist...
The multiplicative nature of the speckle noise in SAR images is a big problem in SAR image segmentation. A novel method for automatic segmentation of SAR images is proposed. The wavelet energy is used to extract texture features, the regional statist...
2006, 28(5): 936-940.
Abstract:
Based on the analysis of the algorithms for implementing Multistage Wiener Filter (MWF), the MWF implemented by the Correlation Subtraction Algorithm (CSA) is proved to be an Unitary MWF (UMWF). The rank reduction performance of UMWF is superior to t...
Based on the analysis of the algorithms for implementing Multistage Wiener Filter (MWF), the MWF implemented by the Correlation Subtraction Algorithm (CSA) is proved to be an Unitary MWF (UMWF). The rank reduction performance of UMWF is superior to t...
2006, 28(5): 941-944.
Abstract:
An error model of transmitting array mutual coupling, gain and phase error of the synthetic transmitted beam bistatic HF-Surface Wave Radar (HF-SWR) is investigated in this paper. According to the characteristics of the error model, a transmitting ar...
An error model of transmitting array mutual coupling, gain and phase error of the synthetic transmitted beam bistatic HF-Surface Wave Radar (HF-SWR) is investigated in this paper. According to the characteristics of the error model, a transmitting ar...
2006, 28(5): 945-949.
Abstract:
In this paper, geometric accuracy of the airborne high resolution SAR developed by Institute of Electronics, Chinese Academy of Sciences (IECAS) is verified with real terrain map data by using classical radar photogrammetry.The experimental results s...
In this paper, geometric accuracy of the airborne high resolution SAR developed by Institute of Electronics, Chinese Academy of Sciences (IECAS) is verified with real terrain map data by using classical radar photogrammetry.The experimental results s...
2006, 28(5): 950-954.
Abstract:
In this paper, an accurate and efficient implementation approach of the Method of Moments (MOM) is developed to compute scattering from 3-D targets in the subsurface, which is based on the Mixed Potential Integral Equation (MPIE) in layered media and...
In this paper, an accurate and efficient implementation approach of the Method of Moments (MOM) is developed to compute scattering from 3-D targets in the subsurface, which is based on the Mixed Potential Integral Equation (MPIE) in layered media and...
2006, 28(5): 955-960.
Abstract:
The diversified researches of capacity of digital watermarking are summarized in this paper. The capacity of watermarking as a basic communication system, the capacity as side information, the capacity using dirty paper encoding and the capacity of s...
The diversified researches of capacity of digital watermarking are summarized in this paper. The capacity of watermarking as a basic communication system, the capacity as side information, the capacity using dirty paper encoding and the capacity of s...
