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2006 Vol. 28, No. 7
Display Method:
2006, 28(7): 1153-1159.
Abstract:
A hybrid algorithm of the BP-ANN/GA (Back Propagation Artificial Neural Network and Genetic Algorithm) is developed to optimize the initial weights and make fast convergence of the BP-ANN. This algorithm is applied to classification of urban terrain ...
A hybrid algorithm of the BP-ANN/GA (Back Propagation Artificial Neural Network and Genetic Algorithm) is developed to optimize the initial weights and make fast convergence of the BP-ANN. This algorithm is applied to classification of urban terrain ...
2006, 28(7): 1160-1164.
Abstract:
Colorization of gray-scale image is in general an active and challenging area of research in image processing. In this paper current colorizing algorithms are summarized, of which Levins method is analyzed in particular. According to the speed droppi...
Colorization of gray-scale image is in general an active and challenging area of research in image processing. In this paper current colorizing algorithms are summarized, of which Levins method is analyzed in particular. According to the speed droppi...
2006, 28(7): 1165-1168.
Abstract:
A hybrid filter training and design method for adaptive image noise cancellation with establishing noise channel model is presented in this paper. Trainings are performed with input and output test images for channels of different types and/or differ...
A hybrid filter training and design method for adaptive image noise cancellation with establishing noise channel model is presented in this paper. Trainings are performed with input and output test images for channels of different types and/or differ...
2006, 28(7): 1169-1173.
Abstract:
Image segmentation is a significant part in image processing field. Inspired by the threshold-based segmentation methods, a novel algorithm based on immune clone selection and optimal entropy theory is presented in this paper. Immune clone selection ...
Image segmentation is a significant part in image processing field. Inspired by the threshold-based segmentation methods, a novel algorithm based on immune clone selection and optimal entropy theory is presented in this paper. Immune clone selection ...
2006, 28(7): 1174-1178.
Abstract:
Electronic Digital Image Stabilization (EDIS) system has a large amount of data and intensive computation. The real-time implementation of EDIS system entails rapid processing of data. The characteristics of video and image series process are the dat...
Electronic Digital Image Stabilization (EDIS) system has a large amount of data and intensive computation. The real-time implementation of EDIS system entails rapid processing of data. The characteristics of video and image series process are the dat...
2006, 28(7): 1179-1182.
Abstract:
Based on the Kalman filtering method and white noise estimation theory, under the linear minimum variance optimal information fusion criterion weighted by matrices，a multisensor distributed fusion optimal white noise deconvolution filter is presented...
Based on the Kalman filtering method and white noise estimation theory, under the linear minimum variance optimal information fusion criterion weighted by matrices，a multisensor distributed fusion optimal white noise deconvolution filter is presented...
2006, 28(7): 1183-1187.
Abstract:
This paper first proposes a new method for evaluating the reliability of cepstral components and extends the marginalisation technique to cepstral recognizers. Then a noise adaptive multi-stream hybrid sub-band approach is proposed for robust speech ...
This paper first proposes a new method for evaluating the reliability of cepstral components and extends the marginalisation technique to cepstral recognizers. Then a noise adaptive multi-stream hybrid sub-band approach is proposed for robust speech ...
2006, 28(7): 1188-1191.
Abstract:
The characteristics of Uyghur, Chinese and English scripts are totally different. A Uyghur, Chinese and English multilingual document recognition system is implemented the first time based on the multilingual OCR system design principle, which includ...
The characteristics of Uyghur, Chinese and English scripts are totally different. A Uyghur, Chinese and English multilingual document recognition system is implemented the first time based on the multilingual OCR system design principle, which includ...
2006, 28(7): 1192-1195.
Abstract:
Walsh-Haar function system is a new kind of function systems that has good global/local property. Discrete Walsh-Haar transformation is an orthogonal transformation that can be widely used in signal processing. In this paper, a new type of transforma...
Walsh-Haar function system is a new kind of function systems that has good global/local property. Discrete Walsh-Haar transformation is an orthogonal transformation that can be widely used in signal processing. In this paper, a new type of transforma...
2006, 28(7): 1196-1200.
Abstract:
The traditional Constant Modulus (CM) beamformers are found to degrade in impulsive noise environment. In this paper， -stable distribution is introduced as a model of impulsive noise. And a robust CM beamformer is proposed. Steady -state of the beamf...
The traditional Constant Modulus (CM) beamformers are found to degrade in impulsive noise environment. In this paper， -stable distribution is introduced as a model of impulsive noise. And a robust CM beamformer is proposed. Steady -state of the beamf...
2006, 28(7): 1201-1203.
Abstract:
After comparing Learning Vector Quantization (LVQ) algorithm and Generalized Learning Vector Quantization (GLVQ) algorithm, this paper establishes a GLVQ-based classification model for remote sensing image. With the experimental applications of land-...
After comparing Learning Vector Quantization (LVQ) algorithm and Generalized Learning Vector Quantization (GLVQ) algorithm, this paper establishes a GLVQ-based classification model for remote sensing image. With the experimental applications of land-...
2006, 28(7): 1204-1208.
Abstract:
A new multitarget tracking method based on multidimensional assignment algorithm is developed for passive DOA systems in the paper. The method combines 3D datum line least cost algorithm and dynamic 2D assignment algorithm. The key features of the pr...
A new multitarget tracking method based on multidimensional assignment algorithm is developed for passive DOA systems in the paper. The method combines 3D datum line least cost algorithm and dynamic 2D assignment algorithm. The key features of the pr...
2006, 28(7): 1209-1214.
Abstract:
The surveillance space of Phased Array Radar(PAR) supported by early warning system is studied in the paper under the background of Ballistic Missile Defense(BMD). Firstly, surveillance space of PAR without prior indication information is discussed. ...
The surveillance space of Phased Array Radar(PAR) supported by early warning system is studied in the paper under the background of Ballistic Missile Defense(BMD). Firstly, surveillance space of PAR without prior indication information is discussed. ...
2006, 28(7): 1215-1218.
Abstract:
The redundant contourlet transform implemented by undecimated pyramidal decomposition and directional filter bank is proposed. The circular symmetric filter bank satisfying perfect reconstruction conditions in the undecimated pyramidal decomposition ...
The redundant contourlet transform implemented by undecimated pyramidal decomposition and directional filter bank is proposed. The circular symmetric filter bank satisfying perfect reconstruction conditions in the undecimated pyramidal decomposition ...
2006, 28(7): 1219-1222.
Abstract:
Multi-polarization, low frequency Ultra Wide Band Synthetic Aperture Radar (UWB SAR) is one of the most important aspects of the radar technology. The low frequency, UWB and large processing angle result that the polarimetric calibration for regular ...
Multi-polarization, low frequency Ultra Wide Band Synthetic Aperture Radar (UWB SAR) is one of the most important aspects of the radar technology. The low frequency, UWB and large processing angle result that the polarimetric calibration for regular ...
2006, 28(7): 1223-1227.
Abstract:
A method, which combines Steered Response Power with PHAse Transform (SRP-PHAT), is a robust speech localization approach with microphone arrays. A relatively precise direction of arrival (DOA) estimation can be achieved by using it in the environmen...
A method, which combines Steered Response Power with PHAse Transform (SRP-PHAT), is a robust speech localization approach with microphone arrays. A relatively precise direction of arrival (DOA) estimation can be achieved by using it in the environmen...
2006, 28(7): 1228-1232.
Abstract:
The switched beam antenna is analyzed and its model in system level is presented. Based on analyzing the impact of multi-user detection (MUD) and switched beam antenna on the uplink capacity in TDD-CDMA systems, a novel uplink admission control algor...
The switched beam antenna is analyzed and its model in system level is presented. Based on analyzing the impact of multi-user detection (MUD) and switched beam antenna on the uplink capacity in TDD-CDMA systems, a novel uplink admission control algor...
2006, 28(7): 1233-1237.
Abstract:
A novel method is proposed for digital modulation classification based on Markov chain Monte Carlo (MCMC). Considering the difficulty for Bayesian classifier with unknown residual carrier phase and frequency, marginal likelihood probability density i...
A novel method is proposed for digital modulation classification based on Markov chain Monte Carlo (MCMC). Considering the difficulty for Bayesian classifier with unknown residual carrier phase and frequency, marginal likelihood probability density i...
2006, 28(7): 1238-1241.
Abstract:
A reduced-complexity all-digital timing tracking scheme suited for multi-carrier CDMA signals is proposed and studied. Based on samples selecting and vector rotation of correlation output vector at only on time channel, timing error detection statist...
A reduced-complexity all-digital timing tracking scheme suited for multi-carrier CDMA signals is proposed and studied. Based on samples selecting and vector rotation of correlation output vector at only on time channel, timing error detection statist...
2006, 28(7): 1242-1245.
Abstract:
Multiple Access Interference(MAI) is a well-known bottleneck which limits the capacity of CDMA systems, and as is known to all, hybrid ARQ has been widely used in wireless communication systems to support error free high rate data transmission. A com...
Multiple Access Interference(MAI) is a well-known bottleneck which limits the capacity of CDMA systems, and as is known to all, hybrid ARQ has been widely used in wireless communication systems to support error free high rate data transmission. A com...
2006, 28(7): 1246-1250.
Abstract:
This paper investigates blind space-time interference suppression for MultiCarrier CDMA (MC-CDMA) system in frequency selective Rayleigh fading channel. It is considered that the fading coefficients corresponding to subcarriers are discrete Fourier t...
This paper investigates blind space-time interference suppression for MultiCarrier CDMA (MC-CDMA) system in frequency selective Rayleigh fading channel. It is considered that the fading coefficients corresponding to subcarriers are discrete Fourier t...
2006, 28(7): 1251-1254.
Abstract:
In this paper, the performance of Spread spectrum ALOHA Multiple Access (SAMA) system is deeply studied. The general formula of average bit-error-rate for SAMA system is derived, and the expression for calculating throughput and delay of transmission...
In this paper, the performance of Spread spectrum ALOHA Multiple Access (SAMA) system is deeply studied. The general formula of average bit-error-rate for SAMA system is derived, and the expression for calculating throughput and delay of transmission...
2006, 28(7): 1255-1257.
Abstract:
In view of the performance of the spreading sequences for spread-spectrum communication system, a novel method of obtaining chaotic digital sequences based on the extended chaotic map is given in this paper. The correlation and balance performances o...
In view of the performance of the spreading sequences for spread-spectrum communication system, a novel method of obtaining chaotic digital sequences based on the extended chaotic map is given in this paper. The correlation and balance performances o...
2006, 28(7): 1258-1261.
Abstract:
This paper presents the formula of Chrestenson spectrum of m-value composition logical function by using inversion formula, and gives the formula of auto-correlation function of m-value composition logical function. Furthermore, this paper gives some...
This paper presents the formula of Chrestenson spectrum of m-value composition logical function by using inversion formula, and gives the formula of auto-correlation function of m-value composition logical function. Furthermore, this paper gives some...
2006, 28(7): 1262-1265.
Abstract:
This paper proposes hybrid mapping to generate chaotic sequence, by altering initial value periodically. The results show that the properties of the hybrid chaotic sequence are good，and the sequence generator can be easily realized. It is a class of ...
This paper proposes hybrid mapping to generate chaotic sequence, by altering initial value periodically. The results show that the properties of the hybrid chaotic sequence are good，and the sequence generator can be easily realized. It is a class of ...
2006, 28(7): 1266-1269.
Abstract:
Wideband OFDM communications are easily been interfered by narrowband signal. The attenuation is worse in low SNR. Based on Nilssons wideband OFDM system, a relative threshold exciser for narrowband interference is designed here. The choice of relati...
Wideband OFDM communications are easily been interfered by narrowband signal. The attenuation is worse in low SNR. Based on Nilssons wideband OFDM system, a relative threshold exciser for narrowband interference is designed here. The choice of relati...
2006, 28(7): 1270-1273.
Abstract:
Different from MAP, the soft output of SOVA is not the exact a posteriori probability, and few literatures describe SOVA in mathematical form. This paper gives a new comprehensive mathematical expression of SOVA, and deduces two MAP-equivalent SISO d...
Different from MAP, the soft output of SOVA is not the exact a posteriori probability, and few literatures describe SOVA in mathematical form. This paper gives a new comprehensive mathematical expression of SOVA, and deduces two MAP-equivalent SISO d...
2006, 28(7): 1274-1278.
Abstract:
Lattice Orthogonal Frequency Division Multiplexing(LOFDM) is a promising technique for high data-rate transmission in double(namely time-frequency) dispersive channel. But, as pulse shaping filters of LOFDM system is badly-localized, it is certainty ...
Lattice Orthogonal Frequency Division Multiplexing(LOFDM) is a promising technique for high data-rate transmission in double(namely time-frequency) dispersive channel. But, as pulse shaping filters of LOFDM system is badly-localized, it is certainty ...
2006, 28(7): 1279-1281.
Abstract:
An efficient power and bit allocation algorithm is proposed for wireless OFDM systems aiming at minimization of the bit error rate under the constraint of total transmit power and data rate. The algorithm is based on the water-filling approach and ad...
An efficient power and bit allocation algorithm is proposed for wireless OFDM systems aiming at minimization of the bit error rate under the constraint of total transmit power and data rate. The algorithm is based on the water-filling approach and ad...
2006, 28(7): 1282-1286.
Abstract:
This paper presents a prediction model of frequency parameters of short-wave communication based on Adaptive Neural Fuzzy Inference System(ANFIS). The system parameters of the model are adjusted by delaminating-adaptation genetic algorithm. The model...
This paper presents a prediction model of frequency parameters of short-wave communication based on Adaptive Neural Fuzzy Inference System(ANFIS). The system parameters of the model are adjusted by delaminating-adaptation genetic algorithm. The model...
2006, 28(7): 1287-1290.
Abstract:
An algorithm for the blind estimation of uplink OFDMA synchronization parameters is introduced in this article. The algorithm exploits the second-order cyclostationarity of the received signal to estimate the frequency offset and time delay，in the di...
An algorithm for the blind estimation of uplink OFDMA synchronization parameters is introduced in this article. The algorithm exploits the second-order cyclostationarity of the received signal to estimate the frequency offset and time delay，in the di...
2006, 28(7): 1291-1294.
Abstract:
A new blind symbol timing-tracking algorithm is proposed, using the special OFDM frame structure with cyclic prefix and cyclic postfix. Analysis and simulation results show that the mean square error of timing offset estimation for proposed method is...
A new blind symbol timing-tracking algorithm is proposed, using the special OFDM frame structure with cyclic prefix and cyclic postfix. Analysis and simulation results show that the mean square error of timing offset estimation for proposed method is...
2006, 28(7): 1295-1297.
Abstract:
In this paper, a subspace-based detection method is proposed for analog space-time codes wedded with ultra-wideband (UWB) transmissions. Without estimating the channels at the receiver, the proposed algorithm yields the estimation of transmitted symb...
In this paper, a subspace-based detection method is proposed for analog space-time codes wedded with ultra-wideband (UWB) transmissions. Without estimating the channels at the receiver, the proposed algorithm yields the estimation of transmitted symb...
2006, 28(7): 1298-1302.
Abstract:
In mobile Ad hoc networks, the topology is dynamic, the energy of node is always limited, and there are always asymmetric links between nodes. This paper presents an Energy-Aware Multipath Routing Algorithm(EAMRA) which intends to prolong the TTL(Tim...
In mobile Ad hoc networks, the topology is dynamic, the energy of node is always limited, and there are always asymmetric links between nodes. This paper presents an Energy-Aware Multipath Routing Algorithm(EAMRA) which intends to prolong the TTL(Tim...
2006, 28(7): 1303-1307.
Abstract:
In this paper, an alternative AQM(Active Queue Management) is designed: WDSE (Wavelet-Decomposed Signal Energy) approach is capable of detecting and managing self-similar traffic. This approach uses wavelets and measures the energy of input traffic a...
In this paper, an alternative AQM(Active Queue Management) is designed: WDSE (Wavelet-Decomposed Signal Energy) approach is capable of detecting and managing self-similar traffic. This approach uses wavelets and measures the energy of input traffic a...
2006, 28(7): 1308-1311.
Abstract:
A secure threshold proxy signature scheme is proposed aiming at conspiracy attack, that is, any t (t is threshold value) or more malicious proxy signatures may work together to reconstruct the secret polynomial of the proxy group and derive the secre...
A secure threshold proxy signature scheme is proposed aiming at conspiracy attack, that is, any t (t is threshold value) or more malicious proxy signatures may work together to reconstruct the secret polynomial of the proxy group and derive the secre...
2006, 28(7): 1312-1316.
Abstract:
The distributed decryption scheme for simple addition stream ciphers proposed by Magnus berg is analyzed. Its main disadvantages, i.e. the operations of encryption and decryption are implemented in different finite fields, and the orders of the two f...
The distributed decryption scheme for simple addition stream ciphers proposed by Magnus berg is analyzed. Its main disadvantages, i.e. the operations of encryption and decryption are implemented in different finite fields, and the orders of the two f...
2006, 28(7): 1317-1321.
Abstract:
An LSP extension mechanism is proposed to decrease the signaling overhead and handoff delay and to eliminate the packet loss in MPLS based mobile IP networks. For the LSP extension mechanism, some loops may exist in extended LSP, and the criterion us...
An LSP extension mechanism is proposed to decrease the signaling overhead and handoff delay and to eliminate the packet loss in MPLS based mobile IP networks. For the LSP extension mechanism, some loops may exist in extended LSP, and the criterion us...
2006, 28(7): 1322-1326.
Abstract:
This paper proposes a new method of knowledge discovery based on the structured covering algorithm. Since the network of covering domains is constructed through a special method, it makes each covering domain a valuable pattern. Through analyzing the...
This paper proposes a new method of knowledge discovery based on the structured covering algorithm. Since the network of covering domains is constructed through a special method, it makes each covering domain a valuable pattern. Through analyzing the...
2006, 28(7): 1327-1330.
Abstract:
Attention is focused on a new method to reduce the numerical dispersion of the 3-D Alternating-Direction Implicit Finite-Difference Time-Domain(ADI-FDTD) method through artificial anisotropy. As the wave propagation can be speeded up by introducing p...
Attention is focused on a new method to reduce the numerical dispersion of the 3-D Alternating-Direction Implicit Finite-Difference Time-Domain(ADI-FDTD) method through artificial anisotropy. As the wave propagation can be speeded up by introducing p...
2006, 28(7): 1331-1334.
Abstract:
In this paper, a method of active filter design based on Programmable Operational Transconductance Amplifiers(POTA) is given. The transconductance is adjusted by software in order to improve accuracy. The design procedure is based on Jacobi method an...
In this paper, a method of active filter design based on Programmable Operational Transconductance Amplifiers(POTA) is given. The transconductance is adjusted by software in order to improve accuracy. The design procedure is based on Jacobi method an...
2006, 28(7): 1335-1339.
Abstract:
This paper presents a new circuit to tune Gm value of transconductor accurately which employs switched-capacitor technique to change the bias current of transconductor. A third order elliptical function lowpass filter with accurate tunable frequency ...
This paper presents a new circuit to tune Gm value of transconductor accurately which employs switched-capacitor technique to change the bias current of transconductor. A third order elliptical function lowpass filter with accurate tunable frequency ...
2006, 28(7): 1340-1344.
Abstract:
This paper presents an analog circuit data array description method and circuit-constructing rules that coordinately work with description language. With the prerequisite of no invalid circuit structure, circuit-constructing rules create high quality...
This paper presents an analog circuit data array description method and circuit-constructing rules that coordinately work with description language. With the prerequisite of no invalid circuit structure, circuit-constructing rules create high quality...
