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2003 Vol. 25, No. 11
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2003, 25(11): 1441-1446.
Abstract:
For the QPSK-modulated OFDM system, the channel estimation accuracy can be improved using of the soft information which is based on the iterative decoder principle of Turbo. Meanwhile, in order to avoid serious error propagation due to the error deci...
For the QPSK-modulated OFDM system, the channel estimation accuracy can be improved using of the soft information which is based on the iterative decoder principle of Turbo. Meanwhile, in order to avoid serious error propagation due to the error deci...
2003, 25(11): 1447-1451.
Abstract:
This paper deals with pilot-based channel estimation of space-time coded OFDM system in frequency selective channels. DFT-based LS and LMMSE method are studied. A practical channel estimation method is proposed. In proposed method the complexity of L...
This paper deals with pilot-based channel estimation of space-time coded OFDM system in frequency selective channels. DFT-based LS and LMMSE method are studied. A practical channel estimation method is proposed. In proposed method the complexity of L...
2003, 25(11): 1452-1462.
Abstract:
This paper proposes a decoding scheme in space-time block code system with three transmitting antennas and one receiving antenna for frequency-selective fading channels, which does not require channel estimation at the transmitter or receiver. By app...
This paper proposes a decoding scheme in space-time block code system with three transmitting antennas and one receiving antenna for frequency-selective fading channels, which does not require channel estimation at the transmitter or receiver. By app...
2003, 25(11): 1463-1468.
Abstract:
A Time-Of-Arrival(TOA) estimation method for CDMA system with high reso-lution is proposed. The integrate-dump circuits are used to sample the received signals while the sampling rate is not raised, then the Discrete-Fourier-Transform(DFT) is used to...
A Time-Of-Arrival(TOA) estimation method for CDMA system with high reso-lution is proposed. The integrate-dump circuits are used to sample the received signals while the sampling rate is not raised, then the Discrete-Fourier-Transform(DFT) is used to...
2003, 25(11): 1469-1474.
Abstract:
Based on eigenvalue distributing of input signal, the convergent necessary, condi-tions for LMS and Normalized LMS(NLMS) algorithm are again researched through the accu-rate analysis of the misadjustment. To avoid blindness for applying LMS and NLMS ...
Based on eigenvalue distributing of input signal, the convergent necessary, condi-tions for LMS and Normalized LMS(NLMS) algorithm are again researched through the accu-rate analysis of the misadjustment. To avoid blindness for applying LMS and NLMS ...
2003, 25(11): 1475-1481.
Abstract:
Both chaotic sequences and nonlinear feed-forward logic (NLFFL) sequences based on linear shift register almost have the same properties: the ease of their generation and various families with a large family size and long sequence period, as well as ...
Both chaotic sequences and nonlinear feed-forward logic (NLFFL) sequences based on linear shift register almost have the same properties: the ease of their generation and various families with a large family size and long sequence period, as well as ...
2003, 25(11): 1482-1487.
Abstract:
In this paper, a novel fragile watermark technique is proposed, which is based on the method of Yeung-Mintzers (1997). To resolve the existing security problem, a chaotic key which is based on image feature is used to control the embedding of fragile...
In this paper, a novel fragile watermark technique is proposed, which is based on the method of Yeung-Mintzers (1997). To resolve the existing security problem, a chaotic key which is based on image feature is used to control the embedding of fragile...
2003, 25(11): 1488-1493.
Abstract:
In this paper, a new classification method is proposed that is based on HMM and SVM using FingerCode. This technique uses FingerCode as representation of fingerprint, first, using five HMM classifiers to classify originally, furthermore, basing on th...
In this paper, a new classification method is proposed that is based on HMM and SVM using FingerCode. This technique uses FingerCode as representation of fingerprint, first, using five HMM classifiers to classify originally, furthermore, basing on th...
2003, 25(11): 1494-1498.
Abstract:
Support Vector Machines (SVMs) are a new generation learning system based on recent advances in statistical learning theory. SVMs have many well features that make them attractive for small samples, nonlinear and high dimensional pattern recognition....
Support Vector Machines (SVMs) are a new generation learning system based on recent advances in statistical learning theory. SVMs have many well features that make them attractive for small samples, nonlinear and high dimensional pattern recognition....
2003, 25(11): 1499-1504.
Abstract:
In this paper, a new kind of two-dimensional Cellular Automata (CA) is studied. Several algorithmic rules are discovered that can be used to design new Cellular Neural Networks (CNN) which can implement shadow detector and overstriking for character ...
In this paper, a new kind of two-dimensional Cellular Automata (CA) is studied. Several algorithmic rules are discovered that can be used to design new Cellular Neural Networks (CNN) which can implement shadow detector and overstriking for character ...
2003, 25(11): 1505-1513.
Abstract:
This paper presents some modeling methods for CDMA network planning applica-tions. Linear equations are used for modeling CDMA multi-cell networks and iterative methods are adopted for solving the equations. The simulation results based on these mode...
This paper presents some modeling methods for CDMA network planning applica-tions. Linear equations are used for modeling CDMA multi-cell networks and iterative methods are adopted for solving the equations. The simulation results based on these mode...
2003, 25(11): 1519-1524.
Abstract:
In this paper, the interferomtric experiments on airborne L-SAR system of IECAS is demonstrated. And data obtained from experiments are processed, and Chinese first DEM with repeat-pass airborne SAR, which nearly accords with the real topographic map...
In this paper, the interferomtric experiments on airborne L-SAR system of IECAS is demonstrated. And data obtained from experiments are processed, and Chinese first DEM with repeat-pass airborne SAR, which nearly accords with the real topographic map...
2003, 25(11): 1525-1530.
Abstract:
This paper puts forward a new method of detecting three-aperture Synthetic Aperture Radar (SAR) ground moving targets after studying Displaced Phase Center Antenna (DPCA) and interferometric processing technique. This method can not only discover mov...
This paper puts forward a new method of detecting three-aperture Synthetic Aperture Radar (SAR) ground moving targets after studying Displaced Phase Center Antenna (DPCA) and interferometric processing technique. This method can not only discover mov...
2003, 25(11): 1531-1535.
Abstract:
Microwave imaging techniques which can provide all-weather, day-and-night imag-ing capability have important applications to many scientific fields. It is an active area to ex-plore new microwave imaging ideas, systems and techniques. In this paper, ...
Microwave imaging techniques which can provide all-weather, day-and-night imag-ing capability have important applications to many scientific fields. It is an active area to ex-plore new microwave imaging ideas, systems and techniques. In this paper, ...
Extremal solution of the target\s brightness temperature in millimeter wave radiometric measurements
2003, 25(11): 1536-1541.
Abstract:
The near sensing techniques with millimeter wave play important role in many fields. To make precise measurements of the radiometric brightness temperature of a target, one must set up model of the interaction between the electromagnetic radiation pr...
The near sensing techniques with millimeter wave play important role in many fields. To make precise measurements of the radiometric brightness temperature of a target, one must set up model of the interaction between the electromagnetic radiation pr...
2003, 25(11): 1542-1547.
Abstract:
This paper presents a finite element method for the analysis of waveguide system without spurious modes. Prom the operator theory of the vector wave function space, a succinct and complete electromagnetic wave equation set is derived and the electiic...
This paper presents a finite element method for the analysis of waveguide system without spurious modes. Prom the operator theory of the vector wave function space, a succinct and complete electromagnetic wave equation set is derived and the electiic...
2003, 25(11): 1564-1569.
Abstract:
Ultra-wideband impulse radio is a developing high speed wireless access technology. In this paper, the principle of ultra-wideband multiaccess communication is analyzed with the transmitting signal. In order to study the system performance in mulitpa...
Ultra-wideband impulse radio is a developing high speed wireless access technology. In this paper, the principle of ultra-wideband multiaccess communication is analyzed with the transmitting signal. In order to study the system performance in mulitpa...
2003, 25(11): 1570-1574.
Abstract:
This paper presents a novel blind audio digital watermark algorithm. It makes full use of the multi-resolution of DWT and the energy compression of DCT and embeds binary image watermark in the audio by quantification process. The watermark can be ext...
This paper presents a novel blind audio digital watermark algorithm. It makes full use of the multi-resolution of DWT and the energy compression of DCT and embeds binary image watermark in the audio by quantification process. The watermark can be ext...
2003, 25(11): 1575-1577.
Abstract:
In this paper, echoes are decomposed based on wavelet multiresolution analysis. It is shown that the energy of wavelet coefficients is exponential to the decomposed scale in some degree, which is similar to the definition of fractal dimension. Hence,...
In this paper, echoes are decomposed based on wavelet multiresolution analysis. It is shown that the energy of wavelet coefficients is exponential to the decomposed scale in some degree, which is similar to the definition of fractal dimension. Hence,...
2003, 25(11): 1578-1580.
Abstract:
In the paper, an improved secret sharing scheme based on elliptic curve cryptography is proposed. It guarantees the mutual identity authentication between the legal dealer and the participating parties and can protect against the cheating action. The...
In the paper, an improved secret sharing scheme based on elliptic curve cryptography is proposed. It guarantees the mutual identity authentication between the legal dealer and the participating parties and can protect against the cheating action. The...
2003, 25(11): 1581-1584.
Abstract:
In this paper, a new edge-reserve filtering algorithm is presented. It adaptively adjusts the size of the filters supporting area according to the local variance of the interested area. The bigger the local variance is, which means the more high freq...
In this paper, a new edge-reserve filtering algorithm is presented. It adaptively adjusts the size of the filters supporting area according to the local variance of the interested area. The bigger the local variance is, which means the more high freq...
2003, 25(11): 1514-1518.
Abstract:
Under Kirchhoff principle, the security property of digital chaotic encryption system is discussed using chosen-ciphertext attacking. The key of the encryption system can be got by chosen-ciphertext attacking. The digital chaotic encryption system ba...
Under Kirchhoff principle, the security property of digital chaotic encryption system is discussed using chosen-ciphertext attacking. The key of the encryption system can be got by chosen-ciphertext attacking. The digital chaotic encryption system ba...
2003, 25(11): 1548-1557.
Abstract:
A Digital Audio Broadcasting(DAB) system, which is based on advanced technique of Coded Orthogonal Frequency Division Multiplexing (COFDM), can provide improved per-formance of high robustness and virtual CD-like quality. In-Band On-Channel(IBOC) dig...
A Digital Audio Broadcasting(DAB) system, which is based on advanced technique of Coded Orthogonal Frequency Division Multiplexing (COFDM), can provide improved per-formance of high robustness and virtual CD-like quality. In-Band On-Channel(IBOC) dig...
2003, 25(11): 1558-1563.
Abstract:
H. R. Walker presented a high spectral efficiency modulation (VMSK). It can reach 30 bit/(sHz) simply without loss of SNR in his analysis. There are papers introduce this technology in China too. But, through deeply analysis based on the engineering ...
H. R. Walker presented a high spectral efficiency modulation (VMSK). It can reach 30 bit/(sHz) simply without loss of SNR in his analysis. There are papers introduce this technology in China too. But, through deeply analysis based on the engineering ...
