Email alert
2008 Vol. 30, No. 7
Display Method:
2008, 30(7): 1525-1529.
doi: 10.3724/SP.J.1146.2007.01874
Abstract:
Information sharing and baseline measurement inter-satellites are key technologies for the space based virtual exploring mission of Distributed Spacecraft(DS). The integrated mode of inter-satellite communication and baseline measurement for DS is pr...
Information sharing and baseline measurement inter-satellites are key technologies for the space based virtual exploring mission of Distributed Spacecraft(DS). The integrated mode of inter-satellite communication and baseline measurement for DS is pr...
2008, 30(7): 1530-1534.
doi: 10.3724/SP.J.1146.2006.01882
Abstract:
A serial Turbo-DFH iterative demodulation and decoding scheme is proposed, with regarding the frequency transition as some code. In the scheme, the encoder consists of an outer encoder and an interweaver, serially concatenating with a transition func...
A serial Turbo-DFH iterative demodulation and decoding scheme is proposed, with regarding the frequency transition as some code. In the scheme, the encoder consists of an outer encoder and an interweaver, serially concatenating with a transition func...
2008, 30(7): 1535-1539.
doi: 10.3724/SP.J.1146.2007.01226
Abstract:
A cross-layer packet scheduling algorithm is proposed for multi-user MIMO-OFDMA systems with the mixed services, such as Real-Time (RT) and Non-Real-Time (NRT) services. The proposed scheduling algorithm is based on the channel state information of p...
A cross-layer packet scheduling algorithm is proposed for multi-user MIMO-OFDMA systems with the mixed services, such as Real-Time (RT) and Non-Real-Time (NRT) services. The proposed scheduling algorithm is based on the channel state information of p...
2008, 30(7): 1540-1543.
doi: 10.3724/SP.J.1146.2006.01939
Abstract:
This paper investigates adaptive resource allocation scheme to maximize the sum-rate under the QoS constraint for multiuser MIMO/OFDM downlink. Specifically, the basestation exploits spatial division multiple access (SDMA) to support several users in...
This paper investigates adaptive resource allocation scheme to maximize the sum-rate under the QoS constraint for multiuser MIMO/OFDM downlink. Specifically, the basestation exploits spatial division multiple access (SDMA) to support several users in...
2008, 30(7): 1544-1547.
doi: 10.3724/SP.J.1146.2006.01985
Abstract:
Call admission control (CAC) is one of the most important parts of resource management in mobile communication systems. It keeps the system work stable by accepting or rejecting users service requests. CAC solves the conflict between the service sati...
Call admission control (CAC) is one of the most important parts of resource management in mobile communication systems. It keeps the system work stable by accepting or rejecting users service requests. CAC solves the conflict between the service sati...
2008, 30(7): 1548-1551.
doi: 10.3724/SP.J.1146.2007.01074
Abstract:
In this paper, a novel dynamic spectrum sharing scheme combining Spectrum Adaptation (SA) and MIMO-OFDM is proposed. In the scheme, an improved model due to signal power thresholds is adopted to accomplish spectrum adaptation for unlicensed users. In...
In this paper, a novel dynamic spectrum sharing scheme combining Spectrum Adaptation (SA) and MIMO-OFDM is proposed. In the scheme, an improved model due to signal power thresholds is adopted to accomplish spectrum adaptation for unlicensed users. In...
2008, 30(7): 1552-1556.
doi: 10.3724/SP.J.1146.2006.01923
Abstract:
The frequency offsets and channel gains estimation problem for MIMO system in the case of flat-fading channels is addressed. Based on the MUSIC (Multiple Signal Classification) and the ML (Maximum Likelihood) methods, a new joint estimation algorithm...
The frequency offsets and channel gains estimation problem for MIMO system in the case of flat-fading channels is addressed. Based on the MUSIC (Multiple Signal Classification) and the ML (Maximum Likelihood) methods, a new joint estimation algorithm...
2008, 30(7): 1557-1561.
doi: 10.3724/SP.J.1146.2006.01890
Abstract:
A novel two-user cooperative diversity scheme based on concatenated channel code and distributed space-time block code is proposed in this paper, and the close form expression and numerical results of channel capacity, outage probability and bit erro...
A novel two-user cooperative diversity scheme based on concatenated channel code and distributed space-time block code is proposed in this paper, and the close form expression and numerical results of channel capacity, outage probability and bit erro...
2008, 30(7): 1562-1565.
doi: 10.3724/SP.J.1146.2006.01949
Abstract:
In this paper, a multilevel coded ultra wideband system with combined iterative pulses demapping and decoding algorithm is proposed. The simulation result of three level coded ultra wideband systems show that the bit error performance has been improv...
In this paper, a multilevel coded ultra wideband system with combined iterative pulses demapping and decoding algorithm is proposed. The simulation result of three level coded ultra wideband systems show that the bit error performance has been improv...
2008, 30(7): 1566-1570.
doi: 10.3724/SP.J.1146.2006.01900
Abstract:
Based on the immune clonal selection theory and the novel genetic quantum algorithm, an Immune Clonal Quantum Algorithm (ICQA) is proposed to solve high complexity of optimum multiuser detection in code division multiple access systems. Using this al...
Based on the immune clonal selection theory and the novel genetic quantum algorithm, an Immune Clonal Quantum Algorithm (ICQA) is proposed to solve high complexity of optimum multiuser detection in code division multiple access systems. Using this al...
2008, 30(7): 1571-1575.
doi: 10.3724/SP.J.1146.2007.00914
Abstract:
A modulation classification method for phase-amplitude-modulated signals transmitted through frequency-nonselective fading Multi-Input Multi-Output (MIMO) channels is presented based on Sequential Monte Carlo (SMC) method. An equivalent dynamic state...
A modulation classification method for phase-amplitude-modulated signals transmitted through frequency-nonselective fading Multi-Input Multi-Output (MIMO) channels is presented based on Sequential Monte Carlo (SMC) method. An equivalent dynamic state...
2008, 30(7): 1576-1579.
doi: 10.3724/SP.J.1146.2006.02032
Abstract:
An Unscented Kalman Filter (UKF) based noncoherent detection method for Chaos-Shift-Keying (CSK) communication system is proposed in this paper. The first symbol is used as the training symbol. The carrier signal is estimated from the received signal...
An Unscented Kalman Filter (UKF) based noncoherent detection method for Chaos-Shift-Keying (CSK) communication system is proposed in this paper. The first symbol is used as the training symbol. The carrier signal is estimated from the received signal...
2008, 30(7): 1580-1583.
doi: 10.3724/SP.J.1146.2006.02030
Abstract:
In this paper, an optimal adaptive multiuser subcarrier allocation with partial-channel response is proposed. This algorithm reduces computational complexity without apparent performance attenuation based on multiusers feedback information and dynami...
In this paper, an optimal adaptive multiuser subcarrier allocation with partial-channel response is proposed. This algorithm reduces computational complexity without apparent performance attenuation based on multiusers feedback information and dynami...
2008, 30(7): 1584-1587.
doi: 10.3724/SP.J.1146.2006.02026
Abstract:
Compared with the conventional Time-Division Multiplexed (TDM) channel estimation scheme based on training sequences, the use of implicit training saves valuable bandwidth, where the training sequences are added to information sequences before antenn...
Compared with the conventional Time-Division Multiplexed (TDM) channel estimation scheme based on training sequences, the use of implicit training saves valuable bandwidth, where the training sequences are added to information sequences before antenn...
2008, 30(7): 1588-1590.
doi: 10.3724/SP.J.1146.2006.02087
Abstract:
A new combined MSDD iterative differential demodulation and channel decoding algorithm based on Soft-Input Hard-Output(SIHO) Viterbi decoding algorithm is presented. The new algorithm includes feed-forward iteration method and feed-backward iteration...
A new combined MSDD iterative differential demodulation and channel decoding algorithm based on Soft-Input Hard-Output(SIHO) Viterbi decoding algorithm is presented. The new algorithm includes feed-forward iteration method and feed-backward iteration...
2008, 30(7): 1591-1593.
doi: 10.3724/SP.J.1146.2007.00170
Abstract:
Theoretical models of envelope making and phase making of optical fiber chaotic secure communication are studied by coupling the chaotic encoding multiple-quantum-well laser systems and an optical fiber channel. Effects of the self-phase modulation o...
Theoretical models of envelope making and phase making of optical fiber chaotic secure communication are studied by coupling the chaotic encoding multiple-quantum-well laser systems and an optical fiber channel. Effects of the self-phase modulation o...
2008, 30(7): 1594-1597.
doi: 10.3724/SP.J.1146.2006.01934
Abstract:
SIP is used in IMS to perform multimedia session setup and maintenance. However, it is text-based and has large messages with sizes frequently exceeding several hundred bytes during the session setup. As a result, it causes more call setup delay. Bas...
SIP is used in IMS to perform multimedia session setup and maintenance. However, it is text-based and has large messages with sizes frequently exceeding several hundred bytes during the session setup. As a result, it causes more call setup delay. Bas...
2008, 30(7): 1598-1601.
doi: 10.3724/SP.J.1146.2007.01198
Abstract:
A Cooperative Network Coding technique based on Space-Time code (ST-CNC) is proposed, which combats channel fading and improves resource efficiency and network throughput. A close form expression for theoretical Bit Error Rate (BER) performance of th...
A Cooperative Network Coding technique based on Space-Time code (ST-CNC) is proposed, which combats channel fading and improves resource efficiency and network throughput. A close form expression for theoretical Bit Error Rate (BER) performance of th...
2008, 30(7): 1602-1605.
doi: 10.3724/SP.J.1146.2006.01973
Abstract:
An Impulse Radio UWB (IR-UWB) system uses very narrow pulses with time-hopping and time diversity to transmit data, where the signals have very low duty cycle. In this paper the cause of data frame transmission failure is analyzed in a distributed IR...
An Impulse Radio UWB (IR-UWB) system uses very narrow pulses with time-hopping and time diversity to transmit data, where the signals have very low duty cycle. In this paper the cause of data frame transmission failure is analyzed in a distributed IR...
2008, 30(7): 1606-1609.
doi: 10.3724/SP.J.1146.2006.01932
Abstract:
An extension MAC Protocol based on 802.11e is proposed for better supporting Class of Service in data link layer of Ad hoc. By using multiple reserving channel method, the superiority of the higher priority flows in medium contention is enhanced. By ...
An extension MAC Protocol based on 802.11e is proposed for better supporting Class of Service in data link layer of Ad hoc. By using multiple reserving channel method, the superiority of the higher priority flows in medium contention is enhanced. By ...
2008, 30(7): 1610-1614.
doi: 10.3724/SP.J.1146.2006.01926
Abstract:
A new Markov chain model for the IEEE 802.11e EDCA is presented. The model takes into account both the idle state and differentiation based on different AIFS-value for different traffic. The signal transfer function of the generalized state transitio...
A new Markov chain model for the IEEE 802.11e EDCA is presented. The model takes into account both the idle state and differentiation based on different AIFS-value for different traffic. The signal transfer function of the generalized state transitio...
2008, 30(7): 1615-1618.
doi: 10.3724/SP.J.1146.2007.00062
Abstract:
The existing mobility support scheme in Host Identity Protocol (HIP) does not support micro-mobility. In this paper, a new mobility support scheme in HIP based on dynamic hierarchical location management is proposed. The Internet is separated into so...
The existing mobility support scheme in Host Identity Protocol (HIP) does not support micro-mobility. In this paper, a new mobility support scheme in HIP based on dynamic hierarchical location management is proposed. The Internet is separated into so...
2008, 30(7): 1619-1624.
doi: 10.3724/SP.J.1146.2006.01880
Abstract:
In this paper, based on studying the routing algorithm and re-router model of MPLS Traffic Engineering，a new routing model S-DQRA is proposed. It not only considers the practical requirements of the traffic when the LSP is initially established, but ...
In this paper, based on studying the routing algorithm and re-router model of MPLS Traffic Engineering，a new routing model S-DQRA is proposed. It not only considers the practical requirements of the traffic when the LSP is initially established, but ...
2008, 30(7): 1625-1629.
doi: 10.3724/SP.J.1146.2006.01992
Abstract:
In order to solve the two major drawbacks of Baptistas chaotic cryptosystem and its modified versionsexcessive length of ciphertext and unbalance ratio of bit 0 to bit 1, this paper gives the lower bound of the expectation of the cipher N-to-plaintex...
In order to solve the two major drawbacks of Baptistas chaotic cryptosystem and its modified versionsexcessive length of ciphertext and unbalance ratio of bit 0 to bit 1, this paper gives the lower bound of the expectation of the cipher N-to-plaintex...
2008, 30(7): 1630-1634.
doi: 10.3724/SP.J.1146.2006.01915
Abstract:
Based on the structure of quasi-cyclic LDPC codes, a synchro partially parallel decoder is proposed in this paper. In the decoder, the check node process units and variable node process units work concurrently, where the new generated soft informatio...
Based on the structure of quasi-cyclic LDPC codes, a synchro partially parallel decoder is proposed in this paper. In the decoder, the check node process units and variable node process units work concurrently, where the new generated soft informatio...
2008, 30(7): 1635-1639.
doi: 10.3724/SP.J.1146.2006.01937
Abstract:
A Low Density Parity Check (LDPC) coded Adaptive Modulation and Coding- Orthogonal Frequency Division Multiplexing (AMC-OFDM) system is proposed, and its theory is given in detail. In order to solve the problem that the traditional Modulation and Cod...
A Low Density Parity Check (LDPC) coded Adaptive Modulation and Coding- Orthogonal Frequency Division Multiplexing (AMC-OFDM) system is proposed, and its theory is given in detail. In order to solve the problem that the traditional Modulation and Cod...
2008, 30(7): 1640-1643.
doi: 10.3724/SP.J.1146.2006.02002
Abstract:
The key to improving the performance of QC LDPC codes is how to construct a parity-check matrix H with a girth distribution as good as possible. In this paper, a novel algorithm for constructing QC LDPC codes, GirthOpt-DE algorithm, is proposed, whic...
The key to improving the performance of QC LDPC codes is how to construct a parity-check matrix H with a girth distribution as good as possible. In this paper, a novel algorithm for constructing QC LDPC codes, GirthOpt-DE algorithm, is proposed, whic...
2008, 30(7): 1644-1647.
doi: 10.3724/SP.J.1146.2007.00035
Abstract:
A class Double Repeat Accumulate (DRA) codes is provided without small cycles by the jointly design among repeater, combiner and interleaver in this paper. Degree distribution is optimized based on EXtrinsic Information Transfer (EXIT) chart. Simulat...
A class Double Repeat Accumulate (DRA) codes is provided without small cycles by the jointly design among repeater, combiner and interleaver in this paper. Degree distribution is optimized based on EXtrinsic Information Transfer (EXIT) chart. Simulat...
2008, 30(7): 1648-1650.
doi: 10.3724/SP.J.1146.2007.00223
Abstract:
Unequal error protection code is used widely in picture and video transmission. Traditional Turbo Product codes do not have unequal error protection. This paper gives a way to produce unequal error protection Turbo Product codes, and the performance ...
Unequal error protection code is used widely in picture and video transmission. Traditional Turbo Product codes do not have unequal error protection. This paper gives a way to produce unequal error protection Turbo Product codes, and the performance ...
2008, 30(7): 1651-1654.
doi: 10.3724/SP.J.1146.2006.01828
Abstract:
In this paper, soft semi-definite relaxation for detection of 16-QAM signaling in MIMO systems is investigated. Additional constraints and dimension-reduction approximation method are proposed, which can be used to calculate the Log-Likelihood Ratio ...
In this paper, soft semi-definite relaxation for detection of 16-QAM signaling in MIMO systems is investigated. Additional constraints and dimension-reduction approximation method are proposed, which can be used to calculate the Log-Likelihood Ratio ...
2008, 30(7): 1656-1660.
doi: 10.3724/SP.J.1146.2006.01981
Abstract:
There is mutual contradiction between direction estimation of users signal and power allocation among all users in the beamforming algorithm. A twice game beamforming algorithm based on game theory is proposed to deal with it. Beamforming game algori...
There is mutual contradiction between direction estimation of users signal and power allocation among all users in the beamforming algorithm. A twice game beamforming algorithm based on game theory is proposed to deal with it. Beamforming game algori...
2008, 30(7): 1661-1665.
doi: 10.3724/SP.J.1146.2006.01875
Abstract:
HMM model is a double random processing which is trained with B-W algorithm, this algorithm based on hill-climbing is easy to lead to locally optimal solutions and its validity is greatly depend on model initial parameters. In order to improve the va...
HMM model is a double random processing which is trained with B-W algorithm, this algorithm based on hill-climbing is easy to lead to locally optimal solutions and its validity is greatly depend on model initial parameters. In order to improve the va...
2008, 30(7): 1666-1670.
doi: 10.3724/SP.J.1146.2006.01872
Abstract:
A novel joint 2-D angle and noncircularity phase estimation for noncircular signals using dual parallel linear subarrays called extended NC-MUSIC (EN-MUSIC) algorithm is presented. The azimuth, the elevation and the noncircularity phases estimated by...
A novel joint 2-D angle and noncircularity phase estimation for noncircular signals using dual parallel linear subarrays called extended NC-MUSIC (EN-MUSIC) algorithm is presented. The azimuth, the elevation and the noncircularity phases estimated by...
2008, 30(7): 1671-1675.
doi: 10.3724/SP.J.1146.2006.02006
Abstract:
A binary wavelet transform-based embedded lossless image coding algorithm called Progressive Partitioning Binary Wavelet-tree Coder (PPBWC) is proposed. In the PPBWC, by using a hybrid coefficient scanning technique, symbols are yielded through the s...
A binary wavelet transform-based embedded lossless image coding algorithm called Progressive Partitioning Binary Wavelet-tree Coder (PPBWC) is proposed. In the PPBWC, by using a hybrid coefficient scanning technique, symbols are yielded through the s...
2008, 30(7): 1676-1679.
doi: 10.3724/SP.J.1146.2006.01924
Abstract:
The tap-length and tap-weight adjusting problems of adaptive filter are converted into a single tap-weight adjusting problem. Based on this, a general tap-length updating formula and a new variable tap-length LMS algorithm are presented. The rational...
The tap-length and tap-weight adjusting problems of adaptive filter are converted into a single tap-weight adjusting problem. Based on this, a general tap-length updating formula and a new variable tap-length LMS algorithm are presented. The rational...
2008, 30(7): 1680-1683.
doi: 10.3724/SP.J.1146.2006.01927
Abstract:
The a priori Signal-to-Noise Ratio (SNR) is the dominant parameter in noise reduction techniques. This paper analyses several typical estimate approaches of the a priori SNR firstly, and then expresses them in the same form, finally presents an impro...
The a priori Signal-to-Noise Ratio (SNR) is the dominant parameter in noise reduction techniques. This paper analyses several typical estimate approaches of the a priori SNR firstly, and then expresses them in the same form, finally presents an impro...
2008, 30(7): 1684-1689.
doi: 10.3724/SP.J.1146.2006.01897
Abstract:
In the state space method based speaker tracking system, the nonlinearity of the measurement function degrades the localizing accuracy of the speaker tracking method severely. The iterated central difference Kalman filter algorithm, which incorporate...
In the state space method based speaker tracking system, the nonlinearity of the measurement function degrades the localizing accuracy of the speaker tracking method severely. The iterated central difference Kalman filter algorithm, which incorporate...
2008, 30(7): 1690-1694.
doi: 10.3724/SP.J.1146.2007.01029
Abstract:
This paper describes an unsupervised translation disambiguation method based on the Equivalent Pseudo Translation (EPT). EPT is constructed by using non-ambiguous words of target language, which is semantically equivalent to the source ambiguous word...
This paper describes an unsupervised translation disambiguation method based on the Equivalent Pseudo Translation (EPT). EPT is constructed by using non-ambiguous words of target language, which is semantically equivalent to the source ambiguous word...
2008, 30(7): 1695-1699.
doi: 10.3724/SP.J.1146.2006.02015
Abstract:
A novel information hiding algorithm for VQ compressed images is presented. Labeling the codewords by the nearest selecting method and using the presented algorithm, secret data can be embedded in the codewords indexes of VQ coded image. The method i...
A novel information hiding algorithm for VQ compressed images is presented. Labeling the codewords by the nearest selecting method and using the presented algorithm, secret data can be embedded in the codewords indexes of VQ coded image. The method i...
2008, 30(7): 1700-1702.
doi: 10.3724/SP.J.1146.2007.00314
Abstract:
Infrared images always have little priori-information and blurry boundaries or even with discontinuous boundaries, and therefore the segmentation of infrared image is very difficult. A variational formulation level set model based on the image global...
Infrared images always have little priori-information and blurry boundaries or even with discontinuous boundaries, and therefore the segmentation of infrared image is very difficult. A variational formulation level set model based on the image global...
2008, 30(7): 1703-1707.
doi: 10.3724/SP.J.1146.2007.01638
Abstract:
A novel feature extraction algorithm is presented for the recognition of traffic sign symbols undergoing degradations in this paper. In order to cope with the degradations, the Combined Blur-Affine Invariants (CBAIs) are adopted to extract the featur...
A novel feature extraction algorithm is presented for the recognition of traffic sign symbols undergoing degradations in this paper. In order to cope with the degradations, the Combined Blur-Affine Invariants (CBAIs) are adopted to extract the featur...
2008, 30(7): 1708-1712.
doi: 10.3724/SP.J.1146.2006.01959
Abstract:
Linear Discriminant Analysis(LDA) is one of the most popular linear projection techniques for feature extraction. The major drawback of applying LDA is that it often encounters the Small Sample Size(SSS) problem. Besides, their optimization criteria ...
Linear Discriminant Analysis(LDA) is one of the most popular linear projection techniques for feature extraction. The major drawback of applying LDA is that it often encounters the Small Sample Size(SSS) problem. Besides, their optimization criteria ...
2008, 30(7): 1713-1716.
doi: 10.3724/SP.J.1146.2007.00450
Abstract:
Most of traditional clustering algorithms get a partition of sample set with mutually exclusive classes, while there is no explicit boundary between classes mostly in the real world. Introducing rough set theory into clustering analysis, this paper p...
Most of traditional clustering algorithms get a partition of sample set with mutually exclusive classes, while there is no explicit boundary between classes mostly in the real world. Introducing rough set theory into clustering analysis, this paper p...
2008, 30(7): 1717-1721.
doi: 10.3724/SP.J.1146.2006.02012
Abstract:
An squint mode image formation algorithm for Tandem Bistatic Synthetic Aperture Radar(BSAR) is addressed in terms of its geometry and echo models, which is relative to second range compression in monostatic SAR. Aspects of second range compression, r...
An squint mode image formation algorithm for Tandem Bistatic Synthetic Aperture Radar(BSAR) is addressed in terms of its geometry and echo models, which is relative to second range compression in monostatic SAR. Aspects of second range compression, r...
2008, 30(7): 1722-1726.
doi: 10.3724/SP.J.1146.2006.01919
Abstract:
Feature extraction based on PCA for 2 dimensional images has the disadvantages of evaluating the covariance matrix accurately with great difficulty and high computational complexity, 2-dimensional PCA (2DPCA) overcomes these flaws. However, a drawbac...
Feature extraction based on PCA for 2 dimensional images has the disadvantages of evaluating the covariance matrix accurately with great difficulty and high computational complexity, 2-dimensional PCA (2DPCA) overcomes these flaws. However, a drawbac...
2008, 30(7): 1727-1730.
doi: 10.3724/SP.J.1146.2006.01997
Abstract:
This paper presents an algorithm about SAR image change detection based on Principal Component Analysis(PCA). This method reshapes the SAR images matrix into vectors, and analyzes the matrix which is composed of the two vectors with PCA process, gett...
This paper presents an algorithm about SAR image change detection based on Principal Component Analysis(PCA). This method reshapes the SAR images matrix into vectors, and analyzes the matrix which is composed of the two vectors with PCA process, gett...
2008, 30(7): 1731-1735.
doi: 10.3724/SP.J.1146.2006.01957
Abstract:
Layover is a nodus in SAR imaging. The unitary ESPRIT algorithm was introduced to resolve the layover problem on the frame of multibaseline InSAR in this paper. The data model of multibaseline InSAR with layover was expatiated firstly, and the layove...
Layover is a nodus in SAR imaging. The unitary ESPRIT algorithm was introduced to resolve the layover problem on the frame of multibaseline InSAR in this paper. The data model of multibaseline InSAR with layover was expatiated firstly, and the layove...
2008, 30(7): 1736-1739.
doi: 10.3724/SP.J.1146.2006.02049
Abstract:
A new method based on cyclic-correlation character for estimating the Doppler and multipath time delay of the wideband echoes for LFM pulse radar by only one pulse signal is presented. First, the Doppler is estimated by energy cumulation of multipath...
A new method based on cyclic-correlation character for estimating the Doppler and multipath time delay of the wideband echoes for LFM pulse radar by only one pulse signal is presented. First, the Doppler is estimated by energy cumulation of multipath...
2008, 30(7): 1740-1743.
doi: 10.3724/SP.J.1146.2006.01925
Abstract:
In order to solve the problem of model mismatch when using parametric approach to estimate the density of High-Resolution Range Profile(HRRP) in radar target recognition, a nonparametric methodStochastic Learning of the Cumulative(SLC) is presented f...
In order to solve the problem of model mismatch when using parametric approach to estimate the density of High-Resolution Range Profile(HRRP) in radar target recognition, a nonparametric methodStochastic Learning of the Cumulative(SLC) is presented f...
2008, 30(7): 1744-1746.
doi: 10.3724/SP.J.1146.2007.00367
Abstract:
Polarimetric Interferometric SAR (PolInSAR) is a new advanced technique recently based on measurement techniques of polarimetric SAR and interferometric SAR, and making use of PolInSAR data for retrieving the vertical structure parameters of the vege...
Polarimetric Interferometric SAR (PolInSAR) is a new advanced technique recently based on measurement techniques of polarimetric SAR and interferometric SAR, and making use of PolInSAR data for retrieving the vertical structure parameters of the vege...
2008, 30(7): 1747-1750.
doi: 10.3724/SP.J.1146.2006.02018
Abstract:
When an airborne platform on which Synthetic Aperture Radar (SAR) mounted on flies very complicatedly over subaperture time, traditional quadratic phase error can not depict the errors introduced by the platform motions, and the phase errors need be ...
When an airborne platform on which Synthetic Aperture Radar (SAR) mounted on flies very complicatedly over subaperture time, traditional quadratic phase error can not depict the errors introduced by the platform motions, and the phase errors need be ...
2008, 30(7): 1751-1755.
doi: 10.3724/SP.J.1146.2007.00921
Abstract:
Possibilistic C-Means (PCM) clustering algorithm exhibits the robustness to noise, but the spatial information is not considered in this algorithm. Due to the effect of speckle in Synthetic Aperture Radar (SAR) images, the serious inaccuracies with s...
Possibilistic C-Means (PCM) clustering algorithm exhibits the robustness to noise, but the spatial information is not considered in this algorithm. Due to the effect of speckle in Synthetic Aperture Radar (SAR) images, the serious inaccuracies with s...
2008, 30(7): 1756-1759.
doi: 10.3724/SP.J.1146.2006.01958
Abstract:
In this paper, a new Synthetic Aperture Radar(SAR) signal of chaotic phase modulated intra-pulse and random coded inter-pulse is porposed depending on the characteristic of extreme initial value sensitivity and pseudo-randmoness and multidimensional ...
In this paper, a new Synthetic Aperture Radar(SAR) signal of chaotic phase modulated intra-pulse and random coded inter-pulse is porposed depending on the characteristic of extreme initial value sensitivity and pseudo-randmoness and multidimensional ...
2008, 30(7): 1760-1762.
doi: 10.3724/SP.J.1146.2007.00347
Abstract:
In this paper, a new SPICE model Multi-segment Multiple Transmission Line model (MMTL) is developed to model high-speed connectors based on Time Domain Reflection (TDR) measurements. This model is superior to MLC model in aspects of stabilization and...
In this paper, a new SPICE model Multi-segment Multiple Transmission Line model (MMTL) is developed to model high-speed connectors based on Time Domain Reflection (TDR) measurements. This model is superior to MLC model in aspects of stabilization and...
2008, 30(7): 1763-1765.
doi: 10.3724/SP.J.1146.2007.00217
Abstract:
In this paper, a multi-waveguide output structure for gyrotron applications is proposed. Numerical simulations are performed for this structure by using High Frequency Structure Simulator ( Ansoft HFSS ). The results show that the energy conversion e...
In this paper, a multi-waveguide output structure for gyrotron applications is proposed. Numerical simulations are performed for this structure by using High Frequency Structure Simulator ( Ansoft HFSS ). The results show that the energy conversion e...
2008, 30(7): 1773-1775.
doi: 10.3724/SP.J.1146.2006.02051
Abstract:
The formula is presented to solve the singular problem of Ludwigs algorithm. And vector field is used as interface to combine Physical Optics (PO) and Uniform Theory of Diffraction (UTD) and MOment Method (MOM) to calculate the airborne antenna. The ...
The formula is presented to solve the singular problem of Ludwigs algorithm. And vector field is used as interface to combine Physical Optics (PO) and Uniform Theory of Diffraction (UTD) and MOment Method (MOM) to calculate the airborne antenna. The ...
2008, 30(7): 1776-1778.
doi: 10.3724/SP.J.1146.2007.00044
Abstract:
A small size and high efficiency HF broadband antenna that use wire sector-conical structure is designed. The Method of Moment is used to compute the VSWR and power gain of the antenna with different wire number, different size of feed-point gap and ...
A small size and high efficiency HF broadband antenna that use wire sector-conical structure is designed. The Method of Moment is used to compute the VSWR and power gain of the antenna with different wire number, different size of feed-point gap and ...
2008, 30(7): 1766-1772.
doi: 10.3724/SP.J.1146.2007.00858
Abstract:
THz Electronic devices have the virtue of high power radiation, operating at normal temperature. They have potential applications in military, civil areas. This paper introduces in detail the recent development techniques and applications of THz elec...
THz Electronic devices have the virtue of high power radiation, operating at normal temperature. They have potential applications in military, civil areas. This paper introduces in detail the recent development techniques and applications of THz elec...
