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2008 Vol. 30, No. 2
Display Method:
2008, 30(2): 255-258.
doi: 10.3724/SP.J.1146.2007.00096
Abstract:
The problem of decision fusion for target recognition is usually solved by the uncertainty information processing methods. This paper presents a novel algorithm of decision fusion for target recognition based on the grey fixed weight clustering analy...
The problem of decision fusion for target recognition is usually solved by the uncertainty information processing methods. This paper presents a novel algorithm of decision fusion for target recognition based on the grey fixed weight clustering analy...
2008, 30(2): 259-262.
doi: 10.3724/SP.J.1146.2006.01090
Abstract:
Though traditional meanshift method has the virtue of simplicity and availability, it does not work well when the target gets an occlusion. In the meanwhile, particle filter can solve this problem easily. Unfortunately, its performance relies heavily...
Though traditional meanshift method has the virtue of simplicity and availability, it does not work well when the target gets an occlusion. In the meanwhile, particle filter can solve this problem easily. Unfortunately, its performance relies heavily...
2008, 30(2): 263-266.
doi: 10.3724/SP.J.1146.2007.00405
Abstract:
A novel image recognition algorithm, Synergetic Neural Networks (SNN) based on immune clonal lgorithm, is proposed in this paper. The presented method introduces the global optimal searching ability of immune clonal select algorithm to construct data...
A novel image recognition algorithm, Synergetic Neural Networks (SNN) based on immune clonal lgorithm, is proposed in this paper. The presented method introduces the global optimal searching ability of immune clonal select algorithm to construct data...
2008, 30(2): 267-271.
doi: 10.3724/SP.J.1146.2006.01140
Abstract:
An anomaly target detection method based on the high correlation band subsets and fuzzy integral fusion is presented to deal with detecting unknown target in unknown background for hyperspectral imagery. Original hyperspectral data is divided into se...
An anomaly target detection method based on the high correlation band subsets and fuzzy integral fusion is presented to deal with detecting unknown target in unknown background for hyperspectral imagery. Original hyperspectral data is divided into se...
2008, 30(2): 272-276.
doi: 10.3724/SP.J.1146.2006.01129
Abstract:
Global analysis method and individual analysis method are proposed in this paper. By analyzing their traits, it is concluded that individual analysis method is more suitable for machine-printed Chinese font recognition. A feature point based individu...
Global analysis method and individual analysis method are proposed in this paper. By analyzing their traits, it is concluded that individual analysis method is more suitable for machine-printed Chinese font recognition. A feature point based individu...
2008, 30(2): 277-281.
doi: 10.3724/SP.J.1146.2006.00999
Abstract:
The assumption of conditional independence in the relationship between adjacent blocks has been proposed by others to reduce the complexity of 2D HMM. In this paper, a more general 2D HMM relaxing this assumption is proposed. More general recursive f...
The assumption of conditional independence in the relationship between adjacent blocks has been proposed by others to reduce the complexity of 2D HMM. In this paper, a more general 2D HMM relaxing this assumption is proposed. More general recursive f...
2008, 30(2): 282-285.
doi: 10.3724/SP.J.1146.2006.01030
Abstract:
This paper describes a simple adaptive pattern control method based on Linearly Constrained Minimum Variance (LCMV). The quiescent pattern weights are imposed in constrain which make the overall beamformer sidelobe response equal the desired quiescen...
This paper describes a simple adaptive pattern control method based on Linearly Constrained Minimum Variance (LCMV). The quiescent pattern weights are imposed in constrain which make the overall beamformer sidelobe response equal the desired quiescen...
2008, 30(2): 286-289.
doi: 10.3724/SP.J.1146.2006.01835
Abstract:
The Polynomial Wigner-Ville Distribution (PWVD) is a time-frequency signal analysis tool for representing Polynomial Phase Signal (PPS). An algorithm for implementation of the PWVD based on the convolution in frequency domain according to the structu...
The Polynomial Wigner-Ville Distribution (PWVD) is a time-frequency signal analysis tool for representing Polynomial Phase Signal (PPS). An algorithm for implementation of the PWVD based on the convolution in frequency domain according to the structu...
2008, 30(2): 290-292.
doi: 10.3724/SP.J.1146.2006.01178
Abstract:
Traditional partition function-based multifractal formalism provides only global estimates of singularity exponents, no local information is offered. However, it is more important to recover the local singularity. A novel algorithm for determining th...
Traditional partition function-based multifractal formalism provides only global estimates of singularity exponents, no local information is offered. However, it is more important to recover the local singularity. A novel algorithm for determining th...
2008, 30(2): 293-297.
doi: 10.3724/SP.J.1146.2006.00804
Abstract:
To estimate sinusoidal signals real frequency ,amplitude and original phase precisely under noisy circumstances, a novel phase difference correcting spectrum method which combines both all-phase FFT and conventional FFT is proposed. This technique is...
To estimate sinusoidal signals real frequency ,amplitude and original phase precisely under noisy circumstances, a novel phase difference correcting spectrum method which combines both all-phase FFT and conventional FFT is proposed. This technique is...
2008, 30(2): 298-301.
doi: 10.3724/SP.J.1146.2006.01111
Abstract:
The multi-fractal spectrum of the DNA sequence of a chromosome reflects its probability distribution, and the joint multi-fractal spectrum of two DNA sequences can be used to discriminate their distributions. By employing joint multi-fractal spectrum...
The multi-fractal spectrum of the DNA sequence of a chromosome reflects its probability distribution, and the joint multi-fractal spectrum of two DNA sequences can be used to discriminate their distributions. By employing joint multi-fractal spectrum...
2008, 30(2): 302-305.
doi: 10.3724/SP.J.1146.2006.01035
Abstract:
The synchronization by using physical link for coast-ship bistatic SIAR is impractical due to the fact that the receiver is installed on a moving ship. The direct-path wave is used to calibrate the phase and complete the transmit beamforming. The fac...
The synchronization by using physical link for coast-ship bistatic SIAR is impractical due to the fact that the receiver is installed on a moving ship. The direct-path wave is used to calibrate the phase and complete the transmit beamforming. The fac...
2008, 30(2): 306-309.
doi: 10.3724/SP.J.1146.2006.00988
Abstract:
A new modified StepTransform algorithm based on CZT is provided in this paper in order to compensate for the insufficiencies of the traditional StepTransform algorithm. The order of the traditional StepTransform algorithm is changed by FFT for the fi...
A new modified StepTransform algorithm based on CZT is provided in this paper in order to compensate for the insufficiencies of the traditional StepTransform algorithm. The order of the traditional StepTransform algorithm is changed by FFT for the fi...
2008, 30(2): 310-313.
doi: 10.3724/SP.J.1146.2006.00986
Abstract:
Synthetic Aperture Radar (SAR) with multiple antennas can realize High-Resolution Wide-Swath (HRWS) imaging，improve Signal to Noise Ratio (SNR) and improve ambiguity suppression for Moving Target Indication (MTI). This paper proposes an algorithm can...
Synthetic Aperture Radar (SAR) with multiple antennas can realize High-Resolution Wide-Swath (HRWS) imaging，improve Signal to Noise Ratio (SNR) and improve ambiguity suppression for Moving Target Indication (MTI). This paper proposes an algorithm can...
2008, 30(2): 314-317.
doi: 10.3724/SP.J.1146.2006.01125
Abstract:
A new CFAR method for SAR image target detection based on ODVI-AC is proposed in this paper. The reference cells of the test cell are firstly processed by an automatic censoring algorithm in order to remove the cells of clutter and interfering target...
A new CFAR method for SAR image target detection based on ODVI-AC is proposed in this paper. The reference cells of the test cell are firstly processed by an automatic censoring algorithm in order to remove the cells of clutter and interfering target...
2008, 30(2): 318-321.
doi: 10.3724/SP.J.1146.2006.00960
Abstract:
Along-Track Interferometry (ATI) or Displaced Phase Centre Antenna (DPCA) technique can be applied to detect ground moving targets for airborne and space-based radars. As the first step of data processing, co-registration of the data received from di...
Along-Track Interferometry (ATI) or Displaced Phase Centre Antenna (DPCA) technique can be applied to detect ground moving targets for airborne and space-based radars. As the first step of data processing, co-registration of the data received from di...
2008, 30(2): 322-325.
doi: 10.3724/SP.J.1146.2006.01085
Abstract:
In this paper, an algorithm is proposed to resolve the precise imaging problem of space-borne SAR with large cell migration. This algorithm is derived in detail based on the squinted equivalent range model. A distinct difference from other algorithms...
In this paper, an algorithm is proposed to resolve the precise imaging problem of space-borne SAR with large cell migration. This algorithm is derived in detail based on the squinted equivalent range model. A distinct difference from other algorithms...
2008, 30(2): 326-330.
doi: 10.3724/SP.J.1146.2006.01144
Abstract:
To overcome the shortcomings of the conventional method of SAR moving target detection and imaging based on the Fractional Fourier Transform(FrFT), a modified method, which combines filtering in fractional Fourier domain, reassigned spectrogram and C...
To overcome the shortcomings of the conventional method of SAR moving target detection and imaging based on the Fractional Fourier Transform(FrFT), a modified method, which combines filtering in fractional Fourier domain, reassigned spectrogram and C...
2008, 30(2): 331-334.
doi: 10.3724/SP.J.1146.2006.01343
Abstract:
In according with the difference of the CS imaging processing algorithm and the RD imaging processing algorithm, the signal and the jamming imaging processing gain of the two algorithms is analyzed at the environment of noise jamming. And the formula...
In according with the difference of the CS imaging processing algorithm and the RD imaging processing algorithm, the signal and the jamming imaging processing gain of the two algorithms is analyzed at the environment of noise jamming. And the formula...
2008, 30(2): 335-338.
doi: 10.3724/SP.J.1146.2006.01101
Abstract:
A mathematical model of the illumination intensity, which is imposed on the point target by the radar beam step steered, is proposed for the hybrid mode SAR system. By the analysis of azimuth compressed echo signal, combining mathematical deduction, ...
A mathematical model of the illumination intensity, which is imposed on the point target by the radar beam step steered, is proposed for the hybrid mode SAR system. By the analysis of azimuth compressed echo signal, combining mathematical deduction, ...
2008, 30(2): 339-342.
doi: 10.3724/SP.J.1146.2006.01096
Abstract:
Direction of Arrival (DOA) technology based on neural network is discussed. In the paper, the DOA method based on function approach and model classification with coding is presented and it employs two kinds of neural networks: Radial Basis Function N...
Direction of Arrival (DOA) technology based on neural network is discussed. In the paper, the DOA method based on function approach and model classification with coding is presented and it employs two kinds of neural networks: Radial Basis Function N...
2008, 30(2): 343-345.
doi: 10.3724/SP.J.1146.2006.01103
Abstract:
Discrete vegetation scattering model based no distorted Born approximation solution is derived. The backscattering mechanism is illustrated. Scattering amplitude functions and model for calculating permittivity are presented. Comparisons between mode...
Discrete vegetation scattering model based no distorted Born approximation solution is derived. The backscattering mechanism is illustrated. Scattering amplitude functions and model for calculating permittivity are presented. Comparisons between mode...
2008, 30(2): 346-349.
doi: 10.3724/SP.J.1146.2006.01093
Abstract:
Aiming at the real application of the communication countermeasures and OFDM signal demodulation, a method is proposed to estimate the sub-carriers of OFDM signal using the high-order cyclic cumulants. Due to the fact that the high-order cyclic cumul...
Aiming at the real application of the communication countermeasures and OFDM signal demodulation, a method is proposed to estimate the sub-carriers of OFDM signal using the high-order cyclic cumulants. Due to the fact that the high-order cyclic cumul...
2008, 30(2): 350-352.
doi: 10.3724/SP.J.1146.2006.01056
Abstract:
In this paper, a new algorithm for multi-target location of sonobuoys field is presented. It is based the technique of the Blind Source Separation (BSS), and focus on the sonobuoys field that every sonobuoy has only one sensor. Computer simulation sh...
In this paper, a new algorithm for multi-target location of sonobuoys field is presented. It is based the technique of the Blind Source Separation (BSS), and focus on the sonobuoys field that every sonobuoy has only one sensor. Computer simulation sh...
2008, 30(2): 353-356.
doi: 10.3724/SP.J.1146.2006.01066
Abstract:
This paper proposes a robust pitch period detection method based on wavelet transformation. A Voiced Regions Detection(VRD)algorithm based on wavelet transform and Teager energy operator is proposed firstly. Then an algorithm based on spatial correla...
This paper proposes a robust pitch period detection method based on wavelet transformation. A Voiced Regions Detection(VRD)algorithm based on wavelet transform and Teager energy operator is proposed firstly. Then an algorithm based on spatial correla...
2008, 30(2): 357-361.
doi: 10.3724/SP.J.1146.2005.01655
Abstract:
This paper applies the microphone array speech enhancement method to the single microphone speech enhancement method, and proposes a new speech enhancement method based on Singular Value Decomposition(SVD). First, for the input matrix, the method ado...
This paper applies the microphone array speech enhancement method to the single microphone speech enhancement method, and proposes a new speech enhancement method based on Singular Value Decomposition(SVD). First, for the input matrix, the method ado...
2008, 30(2): 362-366.
doi: 10.3724/SP.J.1146.2006.01021
Abstract:
Whispered speech is the especial form of peoples pronunciation. There is lower Signal-to-Noise Ratio (SNR) in whispers and unobvious pitch waveform compared with the normal speech, so it is more difficult to process the whispered speech. The endpoint...
Whispered speech is the especial form of peoples pronunciation. There is lower Signal-to-Noise Ratio (SNR) in whispers and unobvious pitch waveform compared with the normal speech, so it is more difficult to process the whispered speech. The endpoint...
2008, 30(2): 367-370.
doi: 10.3724/SP.J.1146.2006.01081
Abstract:
A novel support vector regression method AEPSVR is proposed in this paper. First, an approximate regression function is obtained using -SVR method, and then a new adaptive error penalization function is introduced to enhance the robust performance of...
A novel support vector regression method AEPSVR is proposed in this paper. First, an approximate regression function is obtained using -SVR method, and then a new adaptive error penalization function is introduced to enhance the robust performance of...
2008, 30(2): 371-374.
doi: 10.3724/SP.J.1146.2007.00396
Abstract:
The presence of homoclinic tangencies and homoclinic intersection makes it very difficult, sometimes even impossible, to estimate the shadowing trajectory of the non-hyperbolic nonlinear system. A new algorithm for shadowing the non-hyperbolic nonlin...
The presence of homoclinic tangencies and homoclinic intersection makes it very difficult, sometimes even impossible, to estimate the shadowing trajectory of the non-hyperbolic nonlinear system. A new algorithm for shadowing the non-hyperbolic nonlin...
2008, 30(2): 375-378.
doi: 10.3724/SP.J.1146.2006.01020
Abstract:
Many of the super resolution DOA(Direction-Of-Arrival) estimation algorithms presume the number of signal sources. Since the sample snapshot is limited, however, the available algorithms on source number estimation may fail at lower SNR. In this pape...
Many of the super resolution DOA(Direction-Of-Arrival) estimation algorithms presume the number of signal sources. Since the sample snapshot is limited, however, the available algorithms on source number estimation may fail at lower SNR. In this pape...
2008, 30(2): 379-382.
doi: 10.3724/SP.J.1146.2006.01131
Abstract:
In this paper, a Space-Time Block-Coded MultiCarrier Direct-Sequence Code-Division Multiple-Access (STBC MC-DS-CDMA) system is proposed. By constructing the unified signal model of STBC MC-DS-CDMA system, the subspace-based blind channel estimation i...
In this paper, a Space-Time Block-Coded MultiCarrier Direct-Sequence Code-Division Multiple-Access (STBC MC-DS-CDMA) system is proposed. By constructing the unified signal model of STBC MC-DS-CDMA system, the subspace-based blind channel estimation i...
2008, 30(2): 383-387.
doi: 10.3724/SP.J.1146.2006.01114
Abstract:
An algorithm using auto-correlation matrix of received data for OFDM timing and carrier frequency offset estimation is presented in this paper. The algorithm does not need training data. Fractional frequency offset tracking and frame synchronization ...
An algorithm using auto-correlation matrix of received data for OFDM timing and carrier frequency offset estimation is presented in this paper. The algorithm does not need training data. Fractional frequency offset tracking and frame synchronization ...
2008, 30(2): 388-391.
doi: 10.3724/SP.J.1146.2006.01159
Abstract:
In this paper, two multiple modulus algorithms(MMA+SDD and SMMA+SDD) are proposed based on the characteristic of the QAM signals, which overcome CMAs larger residual error and recover the rotation of the phase at the same time. Computer simulations s...
In this paper, two multiple modulus algorithms(MMA+SDD and SMMA+SDD) are proposed based on the characteristic of the QAM signals, which overcome CMAs larger residual error and recover the rotation of the phase at the same time. Computer simulations s...
2008, 30(2): 392-396.
doi: 10.3724/SP.J.1146.2006.00889
Abstract:
This paper put great emphasis on spectral correlation of MPSK signals. The cyclic spectrum density function of BPSK, QPSK, 8PSK, 16PSK signals based on a new MPSK signal expression is proposed; Extensive computer simulation of four signals based on e...
This paper put great emphasis on spectral correlation of MPSK signals. The cyclic spectrum density function of BPSK, QPSK, 8PSK, 16PSK signals based on a new MPSK signal expression is proposed; Extensive computer simulation of four signals based on e...
2008, 30(2): 397-400.
doi: 10.3724/SP.J.1146.2006.01284
Abstract:
The impact of spatial correlation on performance of unitary space-time codes is focused on in this paper. Based on pair-wise error probability the upper bound of bit and codeword error ratio are given in this paper. The proof of equivalence between t...
The impact of spatial correlation on performance of unitary space-time codes is focused on in this paper. Based on pair-wise error probability the upper bound of bit and codeword error ratio are given in this paper. The proof of equivalence between t...
2008, 30(2): 401-403.
doi: 10.3724/SP.J.1146.2006.01123
Abstract:
For improving the performance of MIMO system with quasi-orthogonal STBC exploiting the channel knowledge, a new transmitter scheme combining the linear precoding matrix is proposed. Before sending out from the transmit antennas, the information is se...
For improving the performance of MIMO system with quasi-orthogonal STBC exploiting the channel knowledge, a new transmitter scheme combining the linear precoding matrix is proposed. Before sending out from the transmit antennas, the information is se...
2008, 30(2): 404-407.
doi: 10.3724/SP.J.1146.2006.00966
Abstract:
In this paper, an algorithm of LDPC codes and adaptive bit power allocation in MIMO-OFDM system is proposed. The algorithms of LDPC codes with two different code rate and adaptive OFDM/MIMO-OFDM are simulated, at the same time, the adaptive algorithm...
In this paper, an algorithm of LDPC codes and adaptive bit power allocation in MIMO-OFDM system is proposed. The algorithms of LDPC codes with two different code rate and adaptive OFDM/MIMO-OFDM are simulated, at the same time, the adaptive algorithm...
2008, 30(2): 408-411.
doi: 10.3724/SP.J.1146.2006.01084
Abstract:
Combined beamforming with Alamouti space-time block coding may not be optimal under many situations since it only provides two equal power loading beams. A new scheme which combines beamforming with space-time block coding is proposed in this paper. ...
Combined beamforming with Alamouti space-time block coding may not be optimal under many situations since it only provides two equal power loading beams. A new scheme which combines beamforming with space-time block coding is proposed in this paper. ...
2008, 30(2): 412-415.
doi: 10.3724/SP.J.1146.2006.01083
Abstract:
Random variables of non-Gaussian distribution are produced by diffusion processes. Under the assumption of ergodicity, the stationary distribution of Markov diffusion processes described by a Stochastic Differential Equation (SDE) is obtained, which ...
Random variables of non-Gaussian distribution are produced by diffusion processes. Under the assumption of ergodicity, the stationary distribution of Markov diffusion processes described by a Stochastic Differential Equation (SDE) is obtained, which ...
2008, 30(2): 416-420.
doi: 10.3724/SP.J.1146.2006.01117
Abstract:
A novel random multi-beam multiplexing technique is proposed in this paper, which improves the system throughput by exploiting both multiuser diversity and spatial freedom degrees of multiple transmit antennas at the base station. Different from conv...
A novel random multi-beam multiplexing technique is proposed in this paper, which improves the system throughput by exploiting both multiuser diversity and spatial freedom degrees of multiple transmit antennas at the base station. Different from conv...
2008, 30(2): 421-425.
doi: 10.3724/SP.J.1146.2006.01472
Abstract:
A cross-layer scheduling algorithm for downlink of multi-user OFDM system is proposed, the algorithm considers users QoS requirement, fairness, packet queue state information of MAC layer and channel state information, power constraint of physical la...
A cross-layer scheduling algorithm for downlink of multi-user OFDM system is proposed, the algorithm considers users QoS requirement, fairness, packet queue state information of MAC layer and channel state information, power constraint of physical la...
2008, 30(2): 426-429.
doi: 10.3724/SP.J.1146.2007.00017
Abstract:
In this paper, the impact of feedback delay on the performance of one closed multi-antennas system based transmit antenna selection is investigated. In such system, the receiver uses the maximum instantaneous SNR to select a target transmit antenna, ...
In this paper, the impact of feedback delay on the performance of one closed multi-antennas system based transmit antenna selection is investigated. In such system, the receiver uses the maximum instantaneous SNR to select a target transmit antenna, ...
2008, 30(2): 430-434.
doi: 10.3724/SP.J.1146.2007.00521
Abstract:
In the traditional schemes, the collided packets will be discarded and retransmitted, which results in a lower performance. In this article, Generalized Hybrid Forward Packets Collision Resolution (GHF-PCR) scheme based on virtual-MIMO techniques is ...
In the traditional schemes, the collided packets will be discarded and retransmitted, which results in a lower performance. In this article, Generalized Hybrid Forward Packets Collision Resolution (GHF-PCR) scheme based on virtual-MIMO techniques is ...
2008, 30(2): 435-438.
doi: 10.3724/SP.J.1146.2006.01054
Abstract:
A soft-detector with low complexity is proposed for Differential Unitary Space-Time Modulation (DUSTM). Based on the multiple symbol differential detection, the detector provides log-likelihood ratios of coded bits for the successive soft-decision de...
A soft-detector with low complexity is proposed for Differential Unitary Space-Time Modulation (DUSTM). Based on the multiple symbol differential detection, the detector provides log-likelihood ratios of coded bits for the successive soft-decision de...
2008, 30(2): 439-442.
doi: 10.3724/SP.J.1146.2006.01075
Abstract:
A novel acquisition performance analysis approach is proposed based on matrix analysis. Given the first step transition probability matrix, the transfer function of acquisition system can be obtained by utilizing the symbol operation function of comp...
A novel acquisition performance analysis approach is proposed based on matrix analysis. Given the first step transition probability matrix, the transfer function of acquisition system can be obtained by utilizing the symbol operation function of comp...
2008, 30(2): 443-446.
doi: 10.3724/SP.J.1146.2007.00200
Abstract:
In this paper, a novel algorithm for distributed power control in cellular CDMA system based on game theory is proposed and an effective cost function is designed for this scheme. Then the existence and uniqueness of the Nash equilibrium are proved f...
In this paper, a novel algorithm for distributed power control in cellular CDMA system based on game theory is proposed and an effective cost function is designed for this scheme. Then the existence and uniqueness of the Nash equilibrium are proved f...
2008, 30(2): 447-450.
doi: 10.3724/SP.J.1146.2006.01010
Abstract:
In this paper, an adaptive multiuser receiver for variable spreading length direct-sequence code- division multiple-access systems in multi-path channel is proposed. The signature vectors are estimated by projection onto the intersectant subspaces. B...
In this paper, an adaptive multiuser receiver for variable spreading length direct-sequence code- division multiple-access systems in multi-path channel is proposed. The signature vectors are estimated by projection onto the intersectant subspaces. B...
2008, 30(2): 451-454.
doi: 10.3724/SP.J.1146.2006.01116
Abstract:
A novel blind channel estimation scheme is presented for Space-Time Coded OFDM (STC-OFDM) systems. This scheme is composed of rude channel estimation by exploiting the finite-alphabet property of information signals and fine channel estimation by usi...
A novel blind channel estimation scheme is presented for Space-Time Coded OFDM (STC-OFDM) systems. This scheme is composed of rude channel estimation by exploiting the finite-alphabet property of information signals and fine channel estimation by usi...
2008, 30(2): 455-458.
doi: 10.3724/SP.J.1146.2006.01049
Abstract:
Based on the theory of queue, a blocking probability model M/M/T/T is presented for a simple and cost-effective architecture of all optical wavelength router to investigate the blocking probability of the wavelength router in WDM wavelength routed al...
Based on the theory of queue, a blocking probability model M/M/T/T is presented for a simple and cost-effective architecture of all optical wavelength router to investigate the blocking probability of the wavelength router in WDM wavelength routed al...
2008, 30(2): 459-463.
doi: 10.3724/SP.J.1146.2007.00002
Abstract:
An implementation and network platform independent model for NGN service description, FE-FR SDM (Four Elements - Full Relations Service Description Model), is proposed. This model consists of four elements: EP (EndPoint), CL (Communication Link), REL...
An implementation and network platform independent model for NGN service description, FE-FR SDM (Four Elements - Full Relations Service Description Model), is proposed. This model consists of four elements: EP (EndPoint), CL (Communication Link), REL...
2008, 30(2): 464-467.
doi: 10.3724/SP.J.1146.2006.00980
Abstract:
The process of service context information is the foundation of future ubiquitous convergent telecommunication services intelligence. Uncertainty is an unavoidable problem of service context information process. In this article, based on Bayesian net...
The process of service context information is the foundation of future ubiquitous convergent telecommunication services intelligence. Uncertainty is an unavoidable problem of service context information process. In this article, based on Bayesian net...
2008, 30(2): 468-471.
doi: 10.3724/SP.J.1146.2006.01034
Abstract:
In this paper, a novel packet scheduling algorithm is proposed for the video traffic in the wireless Ad hoc network. This algorithm considers the special requirements of video traffic, process every packet of video data flow individually and then dis...
In this paper, a novel packet scheduling algorithm is proposed for the video traffic in the wireless Ad hoc network. This algorithm considers the special requirements of video traffic, process every packet of video data flow individually and then dis...
2008, 30(2): 472-476.
doi: 10.3724/SP.J.1146.2006.01022
Abstract:
In this paper, the impact of physical carrier-sense mechanism on the fairness of the IEEE 802.11DCF MAC protocol in multi-hop Ad hoc networks is investigated, considering that physical carrier-sense range is much lager than communication range. This ...
In this paper, the impact of physical carrier-sense mechanism on the fairness of the IEEE 802.11DCF MAC protocol in multi-hop Ad hoc networks is investigated, considering that physical carrier-sense range is much lager than communication range. This ...
2008, 30(2): 477-481.
doi: 10.3724/SP.J.1146.2006.01860
Abstract:
According to wireless Ad hoc networks being able to adjust transmission rate, this paper studies the rate adaptation for network lifetime maximization. The problem is formulated as a mixed integer nonlinear programming, which can be solved using bran...
According to wireless Ad hoc networks being able to adjust transmission rate, this paper studies the rate adaptation for network lifetime maximization. The problem is formulated as a mixed integer nonlinear programming, which can be solved using bran...
2008, 30(2): 482-485.
doi: 10.3724/SP.J.1146.2006.01341
Abstract:
In this article, a brand-new information retrieval model based on Agent technology is proposed, which is to counteract some significant deficiencies existing in current information retrieval systems, such as resource consuming much, information updat...
In this article, a brand-new information retrieval model based on Agent technology is proposed, which is to counteract some significant deficiencies existing in current information retrieval systems, such as resource consuming much, information updat...
2008, 30(2): 486-489.
doi: 10.3724/SP.J.1146.2006.00948
Abstract:
Signature-masked authentication scheme means: when a user obtains a signature (certificate) from CA, in order to get service from a service provider and to prevent any adversary from intercepting the signature or colluding with the service provider t...
Signature-masked authentication scheme means: when a user obtains a signature (certificate) from CA, in order to get service from a service provider and to prevent any adversary from intercepting the signature or colluding with the service provider t...
2008, 30(2): 490-493.
doi: 10.3724/SP.J.1146.2006.01102
Abstract:
The ElectroMagnetic (EM) scattering characteristic from the 3D conducting object above the random ocean-like rough surfaces is evaluated by using the Method of Moment (MoM) in this paper. The vector potential dyadic Greens function and the scalar pot...
The ElectroMagnetic (EM) scattering characteristic from the 3D conducting object above the random ocean-like rough surfaces is evaluated by using the Method of Moment (MoM) in this paper. The vector potential dyadic Greens function and the scalar pot...
2008, 30(2): 494-497.
doi: 10.3724/SP.J.1146.2006.01100
Abstract:
The time-domain EFIE and MFIE approaches produce late-time oscillation for transient scattering responses from conducting objects when the incident spectrum of the field contains frequency components, which may correspond to the internal resonance of...
The time-domain EFIE and MFIE approaches produce late-time oscillation for transient scattering responses from conducting objects when the incident spectrum of the field contains frequency components, which may correspond to the internal resonance of...
2008, 30(2): 498-500.
doi: 10.3724/SP.J.1146.2006.01016
Abstract:
The radiation and impedance characteristic of microstrip antenna may be influenced by cutting slots on the groundplane with applications to widening the frequency band. The Method of Moment(MoM)which is used to solve the scattering of microstrip patc...
The radiation and impedance characteristic of microstrip antenna may be influenced by cutting slots on the groundplane with applications to widening the frequency band. The Method of Moment(MoM)which is used to solve the scattering of microstrip patc...
2008, 30(2): 501-504.
doi: 10.3724/SP.J.1146.2006.01187
Abstract:
In this paper, an X-band TE01 output window is designed, which is suitable for high power klystron. TE01 window has its uniqueness to avoid voltage breakdown due to its mode pattern and window structure. Center frequency for this window is 9GHz and b...
In this paper, an X-band TE01 output window is designed, which is suitable for high power klystron. TE01 window has its uniqueness to avoid voltage breakdown due to its mode pattern and window structure. Center frequency for this window is 9GHz and b...
2008, 30(2): 505-508.
doi: 10.3724/SP.J.1146.2006.00962
Abstract:
Symbol rate estimation of PSK signals could be effectively implemented by employing the cyclic-autocorrelation function or cyclic-autocorrelation based cyclic statistics. Stationary noise, which does not possess cyclostationarity, has an influence on...
Symbol rate estimation of PSK signals could be effectively implemented by employing the cyclic-autocorrelation function or cyclic-autocorrelation based cyclic statistics. Stationary noise, which does not possess cyclostationarity, has an influence on...
