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2006 Vol. 28, No. 2
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2006, 28(2): 193-197.
Abstract:
In order to study the impacts of array configuration and channel model parameters including antenna spacing and scattering angle on the channel capacity of a MIMO (Multiple Input Multiple Output) system, a novel method is proposed to explore the chan...
In order to study the impacts of array configuration and channel model parameters including antenna spacing and scattering angle on the channel capacity of a MIMO (Multiple Input Multiple Output) system, a novel method is proposed to explore the chan...
2006, 28(2): 198-202.
Abstract:
An approach, which exploits the cyclostationarity of the received signal, to blind channel identification for an OFDM system in frequency selective channel is presented in this paper. First, by utilizing the power distribution of the cyclic autocorre...
An approach, which exploits the cyclostationarity of the received signal, to blind channel identification for an OFDM system in frequency selective channel is presented in this paper. First, by utilizing the power distribution of the cyclic autocorre...
2006, 28(2): 203-207.
Abstract:
In cellular mobile communication systems, the hybrid Time Difference Of Arrival(TDOA) and the Angle Of Arrival(AOA) location algorithm can reach higher accuracy than traditional TDOA method does. But in NLOS environment, when the measurement error of...
In cellular mobile communication systems, the hybrid Time Difference Of Arrival(TDOA) and the Angle Of Arrival(AOA) location algorithm can reach higher accuracy than traditional TDOA method does. But in NLOS environment, when the measurement error of...
2006, 28(2): 208-212.
Abstract:
In a multiuser wireless system with multiple antennas, the independence of different users random fading characteristic can be exploited to obtain great gain of multiuser diversity by combining different techniques, such as random beamforming, spatia...
In a multiuser wireless system with multiple antennas, the independence of different users random fading characteristic can be exploited to obtain great gain of multiuser diversity by combining different techniques, such as random beamforming, spatia...
2006, 28(2): 213-216.
Abstract:
Based on the investigation of Multiple-Input Multiple-Output (MIMO) technology and Ultra-Wide Band (UWB) wireless communication systems, a novel MIMO UWB system is proposed, which based on adaptive modulation technique in time varying channel. By usi...
Based on the investigation of Multiple-Input Multiple-Output (MIMO) technology and Ultra-Wide Band (UWB) wireless communication systems, a novel MIMO UWB system is proposed, which based on adaptive modulation technique in time varying channel. By usi...
2006, 28(2): 217-222.
Abstract:
Focusing on coherent DS-SS/MPSK system in single path slow fading channel model, this paper analyzes the effect of frequency offset on system performance, and the closed-form Bit Error Rate (BER) expressions are also obtained. Firstly, the Signal Noi...
Focusing on coherent DS-SS/MPSK system in single path slow fading channel model, this paper analyzes the effect of frequency offset on system performance, and the closed-form Bit Error Rate (BER) expressions are also obtained. Firstly, the Signal Noi...
2006, 28(2): 223-227.
Abstract:
A new method named Particle Swarm Optimization (PSO) has been proposed by Kennedy and Eberhart (1995) and it can accomplish the same goal as GA in a new and faster way. In this paper a new binary algorithm, which derives from conventional PSO concept...
A new method named Particle Swarm Optimization (PSO) has been proposed by Kennedy and Eberhart (1995) and it can accomplish the same goal as GA in a new and faster way. In this paper a new binary algorithm, which derives from conventional PSO concept...
2006, 28(2): 228-231.
Abstract:
A new digital PN code tracking loop with a sequential filter is proposed, and an equivalent model of the loops dynamic process is provided to derive the loops nonlinear performance. The performance is also analyzed by computer simulation under Raylei...
A new digital PN code tracking loop with a sequential filter is proposed, and an equivalent model of the loops dynamic process is provided to derive the loops nonlinear performance. The performance is also analyzed by computer simulation under Raylei...
2006, 28(2): 232-236.
Abstract:
This paper presents a novel multiple object segmentation algorithm based on a Bayesian framework. According to the characteristic of the intra-frame and inter-frame (spatial and temporal) information, a representation of Maximization of the A posteri...
This paper presents a novel multiple object segmentation algorithm based on a Bayesian framework. According to the characteristic of the intra-frame and inter-frame (spatial and temporal) information, a representation of Maximization of the A posteri...
2006, 28(2): 237-241.
Abstract:
This paper describes an efficient Motion-Compensated (MC)three dimension wavelet video coding system. In this system, MC temporal analysis is used to remove temporal redundancy. Then an adaptive group of pictures structure according to characteristic...
This paper describes an efficient Motion-Compensated (MC)three dimension wavelet video coding system. In this system, MC temporal analysis is used to remove temporal redundancy. Then an adaptive group of pictures structure according to characteristic...
2006, 28(2): 242-246.
Abstract:
A syndrome-based type-I Hybrid ARQ (HARQ) is proposed, where Reed-Solomon code is selected to be the FEC subsystem and the error-detection function is embedded ably in the decoding process. Analytical and simulation results of Bit Error Rate (BER) an...
A syndrome-based type-I Hybrid ARQ (HARQ) is proposed, where Reed-Solomon code is selected to be the FEC subsystem and the error-detection function is embedded ably in the decoding process. Analytical and simulation results of Bit Error Rate (BER) an...
2006, 28(2): 247-251.
Abstract:
This paper proposes a pairing-based group key agreement protocol based on Shims certification-based tripartite key agreement protocol. This protocol adopts a pseudo-random sequence to avoid the unknown key-share attack and the known-key attack. Some ...
This paper proposes a pairing-based group key agreement protocol based on Shims certification-based tripartite key agreement protocol. This protocol adopts a pseudo-random sequence to avoid the unknown key-share attack and the known-key attack. Some ...
2006, 28(2): 252-256.
Abstract:
Traditional steganographic techniques for JPEG images always suffer from histogram-based attacks because they change the DCT coefficient histogram of the cover image, or from the reduced hiding capacity due to the correction of the change of the hist...
Traditional steganographic techniques for JPEG images always suffer from histogram-based attacks because they change the DCT coefficient histogram of the cover image, or from the reduced hiding capacity due to the correction of the change of the hist...
Performance Analysis of Joint Source-Channel Decoding Based on MS Estimation and Iterative Structure
2006, 28(2): 257-261.
Abstract:
Based on structure of MS estimation soft-bit source decoding and iterative source-controlled channel decoding, this paper deduces the parameter SNR and BER upper bound for above joint source-channel decoding respectively, and gives the factors which ...
Based on structure of MS estimation soft-bit source decoding and iterative source-controlled channel decoding, this paper deduces the parameter SNR and BER upper bound for above joint source-channel decoding respectively, and gives the factors which ...
2006, 28(2): 262-266.
Abstract:
Fractal modulation based on multiwavelet is proposed and its power density spectrum is calculated and also its bit error ratio under binary data is calculated. Multiwavelet fractal modulation provides more sub-bands and holds more users at each scale...
Fractal modulation based on multiwavelet is proposed and its power density spectrum is calculated and also its bit error ratio under binary data is calculated. Multiwavelet fractal modulation provides more sub-bands and holds more users at each scale...
2006, 28(2): 267-271.
Abstract:
Differential Unitary Space-Time Modulation (DUSTM) based on diagonal signals achieves full antenna diversity without requiring channel estimation. However, its receiver has a computational complexity that grows exponentially with the number of transm...
Differential Unitary Space-Time Modulation (DUSTM) based on diagonal signals achieves full antenna diversity without requiring channel estimation. However, its receiver has a computational complexity that grows exponentially with the number of transm...
2006, 28(2): 272-276.
Abstract:
In this paper, packet scheduling with average transmit power constraint over Gaussian channels is considered with the objective to minimize the maximum delay constraint. It is proved that the optimal average transmit power is decreased with the maxim...
In this paper, packet scheduling with average transmit power constraint over Gaussian channels is considered with the objective to minimize the maximum delay constraint. It is proved that the optimal average transmit power is decreased with the maxim...
2006, 28(2): 277-280.
Abstract:
Because of limited bandwidth capacity in Ad hoc networks, multipath transport is appealing technique to satisfy the requirement of QoS services on bandwidth by improve available bandwidth. In this paper, the feasibility of reasonable distribution for...
Because of limited bandwidth capacity in Ad hoc networks, multipath transport is appealing technique to satisfy the requirement of QoS services on bandwidth by improve available bandwidth. In this paper, the feasibility of reasonable distribution for...
2006, 28(2): 281-285.
Abstract:
A Busy Tone and Directional antenna Multiple Access Control Protocol with power control (BT-DMACP) for Mobile Ad hoc NETwork (MANET) is proposed. The special hidden terminal problems and side lobe interference in directional antennas used network are...
A Busy Tone and Directional antenna Multiple Access Control Protocol with power control (BT-DMACP) for Mobile Ad hoc NETwork (MANET) is proposed. The special hidden terminal problems and side lobe interference in directional antennas used network are...
2006, 28(2): 286-289.
Abstract:
Current centralized restoration schemes are bad match for the increasing of the scale and complexity of networks. A novel distributed network partition scheme is proposed in this paper. A large-scale network can be partitioned into several annular su...
Current centralized restoration schemes are bad match for the increasing of the scale and complexity of networks. A novel distributed network partition scheme is proposed in this paper. A large-scale network can be partitioned into several annular su...
2006, 28(2): 290-294.
Abstract:
The evaluation of Internet QoS (Quality of Service) is naturally multi-discipline. This paper examines the Internet QoS evaluation by integrating QoS index with price factor. The multinomial logit model is adopted in this paper, which is used to mode...
The evaluation of Internet QoS (Quality of Service) is naturally multi-discipline. This paper examines the Internet QoS evaluation by integrating QoS index with price factor. The multinomial logit model is adopted in this paper, which is used to mode...
2006, 28(2): 295-298.
Abstract:
The TRBC (Transmitter and Receiver Based Coding) protocol adopted in CDMA Ad hoc networks is analyzed in this paper, its performance is compared with the traditional TBC (Transmitter Based Coding) and RBC (Receiver Based Coding) protocols. The analys...
The TRBC (Transmitter and Receiver Based Coding) protocol adopted in CDMA Ad hoc networks is analyzed in this paper, its performance is compared with the traditional TBC (Transmitter Based Coding) and RBC (Receiver Based Coding) protocols. The analys...
2006, 28(2): 299-302.
Abstract:
As a cryptography algorithm that can provide non-repudiability, hash chains are widely used in electronic micropayment schemes because of its efficiency. In order to further improve efficiency, multiple hash chains can be simultaneously used to repre...
As a cryptography algorithm that can provide non-repudiability, hash chains are widely used in electronic micropayment schemes because of its efficiency. In order to further improve efficiency, multiple hash chains can be simultaneously used to repre...
2006, 28(2): 303-306.
Abstract:
Based on Schnorr (Elgamal) signature and (string) oblivious transfer, an enhanced oblivious transfer protocol is proposed which solved the access control problem for an oblivious transfer protocol. The protocol proposed has the property: the only rec...
Based on Schnorr (Elgamal) signature and (string) oblivious transfer, an enhanced oblivious transfer protocol is proposed which solved the access control problem for an oblivious transfer protocol. The protocol proposed has the property: the only rec...
2006, 28(2): 307-311.
Abstract:
In perceptual audio coding with low bit rate application, the pre-echo artifact is more distinct, and the effective detection of transient signals is the precondition. Transient intensity is defined in term of the Peak-Mean power Ratio(PMR), accordin...
In perceptual audio coding with low bit rate application, the pre-echo artifact is more distinct, and the effective detection of transient signals is the precondition. Transient intensity is defined in term of the Peak-Mean power Ratio(PMR), accordin...
2006, 28(2): 312-316.
Abstract:
An adaptive bilateral filtering method based on mean shift algorithm is presented. The filter is governed by the kernel width in spatial domain, which controls the spatial extent of nearby data for filtering. Its kernel width in range domain is chose...
An adaptive bilateral filtering method based on mean shift algorithm is presented. The filter is governed by the kernel width in spatial domain, which controls the spatial extent of nearby data for filtering. Its kernel width in range domain is chose...
2006, 28(2): 317-321.
Abstract:
A universal real-time platform for a Space-Time Adaptive Processing (STAP) is developed. The platform is composed of multi-DSPs，FPGA and a general-purpose processor. Refined from the Bulk Synchronous Parallel model (BSP) by Valiant(1990), an STAP com...
A universal real-time platform for a Space-Time Adaptive Processing (STAP) is developed. The platform is composed of multi-DSPs，FPGA and a general-purpose processor. Refined from the Bulk Synchronous Parallel model (BSP) by Valiant(1990), an STAP com...
2006, 28(2): 322-325.
Abstract:
This paper first summarizes the difficulty in detecting and identifying helicopter, then analysis the spectrum signature of radar echo signal from helicopter, and estimates the width of the spectrum modulated by helicopter blades. The author uses the...
This paper first summarizes the difficulty in detecting and identifying helicopter, then analysis the spectrum signature of radar echo signal from helicopter, and estimates the width of the spectrum modulated by helicopter blades. The author uses the...
2006, 28(2): 326-329.
Abstract:
Polarimetric adaptive detection of targets in compound-Gaussian clutter with coherent radar is addressed in the paper. An adaptive polarimetric detection algorithm is presented based upon the Generalized Likelihood Ratio Test (GLRT). The proposed alg...
Polarimetric adaptive detection of targets in compound-Gaussian clutter with coherent radar is addressed in the paper. An adaptive polarimetric detection algorithm is presented based upon the Generalized Likelihood Ratio Test (GLRT). The proposed alg...
2006, 28(2): 330-334.
Abstract:
The condition under which the output signals of monopulse radar receiver with two Swerling 4 targets are approximate to the Gaussian distribution has been studied in order to apply the detection and estimation methods of Rayleigh targets to Sweriling...
The condition under which the output signals of monopulse radar receiver with two Swerling 4 targets are approximate to the Gaussian distribution has been studied in order to apply the detection and estimation methods of Rayleigh targets to Sweriling...
2006, 28(2): 335-339.
Abstract:
The detection problem of dim signal is studied based on mono-frequency or narrowband dual-polarization radar system in this paper. Firstly, the descriptions of Instantaneous Polarization Projection Sequences (IPPS) of signal and noise are presented a...
The detection problem of dim signal is studied based on mono-frequency or narrowband dual-polarization radar system in this paper. Firstly, the descriptions of Instantaneous Polarization Projection Sequences (IPPS) of signal and noise are presented a...
2006, 28(2): 340-344.
Abstract:
In distributed small satellites-synthetic aperture radar (DSS-SAR), the correlation of echoes is determined by both across-track and along-track baselines which are coupling, and the multi-baseline interferometry is obtained with multi small satellit...
In distributed small satellites-synthetic aperture radar (DSS-SAR), the correlation of echoes is determined by both across-track and along-track baselines which are coupling, and the multi-baseline interferometry is obtained with multi small satellit...
2006, 28(2): 345-349.
Abstract:
In this paper, a distributed satellites SAR high resolution imaging method based on spectral synthesis is introduced. In distributed satellites SAR system, the scattering spectrums relative to the same scene acquired by different satellites have spec...
In this paper, a distributed satellites SAR high resolution imaging method based on spectral synthesis is introduced. In distributed satellites SAR system, the scattering spectrums relative to the same scene acquired by different satellites have spec...
2006, 28(2): 350-353.
Abstract:
Based on the study of the 2-dimensional position correlation information among resolution cells of a distributed target, a new method for distributed targets detection in SAR image is proposed. Several forms of the method based on different range mea...
Based on the study of the 2-dimensional position correlation information among resolution cells of a distributed target, a new method for distributed targets detection in SAR image is proposed. Several forms of the method based on different range mea...
2006, 28(2): 354-357.
Abstract:
Chaotic FM signal is similar to random signal. It has good Electronic Counter-Counter Measure (ECCM) capabilities. In this paper, chaotic FM signal is used to improve the ECCM capabilities of imaging radar. A kind of chaotic series was generated usin...
Chaotic FM signal is similar to random signal. It has good Electronic Counter-Counter Measure (ECCM) capabilities. In this paper, chaotic FM signal is used to improve the ECCM capabilities of imaging radar. A kind of chaotic series was generated usin...
2006, 28(2): 358-361.
Abstract:
In this paper, based on the theory of the Block Adaptive Vector Quantization (BAVQ) algorithm, a variable-rate algorithm is proposed. In order to reduce the encoding computation complexity of the improved BAVQ algorithm, a fast VQ search algorithm an...
In this paper, based on the theory of the Block Adaptive Vector Quantization (BAVQ) algorithm, a variable-rate algorithm is proposed. In order to reduce the encoding computation complexity of the improved BAVQ algorithm, a fast VQ search algorithm an...
2006, 28(2): 362-366.
Abstract:
Parameter estimation of radar target scatterer plays an important role in the process of target characteristics analysis and target recognition. Based on the GTD(Geometrical Theory of Diffraction) parametric model, this paper presents a novel method ...
Parameter estimation of radar target scatterer plays an important role in the process of target characteristics analysis and target recognition. Based on the GTD(Geometrical Theory of Diffraction) parametric model, this paper presents a novel method ...
2006, 28(2): 367-371.
Abstract:
In the field of image processing, the segmentation of moving object in video sequences is a hot research topic in recent years. In this paper, a novel method of moving object segmentation based on spatiotemporal Markov Random Field(MRE) is proposed. ...
In the field of image processing, the segmentation of moving object in video sequences is a hot research topic in recent years. In this paper, a novel method of moving object segmentation based on spatiotemporal Markov Random Field(MRE) is proposed. ...
2006, 28(2): 372-375.
Abstract:
Self impedance,mutual impedance and coupling of antennas are crying out for engineering application，but they can not be easily accurately calculated. The scheme that combines variational principles and the FDTD is presented in this paper to calculate...
Self impedance,mutual impedance and coupling of antennas are crying out for engineering application，but they can not be easily accurately calculated. The scheme that combines variational principles and the FDTD is presented in this paper to calculate...
2006, 28(2): 376-379.
Abstract:
In this paper, it is proven that the divergence relationship of electric-field and magnetic-field is non-zero even in charge-free regions, when the electric-field and magnetic-field are calculated with Alternating Direction Implicit Finite-Difference...
In this paper, it is proven that the divergence relationship of electric-field and magnetic-field is non-zero even in charge-free regions, when the electric-field and magnetic-field are calculated with Alternating Direction Implicit Finite-Difference...
2006, 28(2): 380-384.
Abstract:
This paper implements firstly an adiabatic flip-flop whose energy and information can both be recovered using the 2N-2N2P logic circuit structure. And then by means of calculating error and correcting deviation, this paper presents a stable adiabatic...
This paper implements firstly an adiabatic flip-flop whose energy and information can both be recovered using the 2N-2N2P logic circuit structure. And then by means of calculating error and correcting deviation, this paper presents a stable adiabatic...
