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2007 Vol. 29, No. 6
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2007, 29(6): 1271-1275.
doi: 10.3724/SP.J.1146.2005.01553
Abstract:
With the increasing demand for high data rate and high quality of mobile telecommunication services, and the deeply research on multi-antenna techniques, the cellular concept and network topology for future mobile communication systems are necessaril...
With the increasing demand for high data rate and high quality of mobile telecommunication services, and the deeply research on multi-antenna techniques, the cellular concept and network topology for future mobile communication systems are necessaril...
2007, 29(6): 1276-1280.
doi: 10.3724/SP.J.1146.2005.01390
Abstract:
An efficient Sphere Decoding (SD) algorithm is proposed for uncoded Multi-Input Multi-Output (MIMO) systems with a large number of antennas and higher modulation constellations. This method utilizes a channel-based group detection strategy. The trans...
An efficient Sphere Decoding (SD) algorithm is proposed for uncoded Multi-Input Multi-Output (MIMO) systems with a large number of antennas and higher modulation constellations. This method utilizes a channel-based group detection strategy. The trans...
2007, 29(6): 1281-1285.
doi: 10.3724/SP.J.1146.2005.01318
Abstract:
The current IEEE 802.11 PHYs provide multiple transmission rates, but in MAC layer, the rate adaptation algorithm is not specified. This paper studies rate adaptation schemes for high rate IEEE 802.11 WLANs MAC protocol. Firstly, an Enhanced ACKnowle...
The current IEEE 802.11 PHYs provide multiple transmission rates, but in MAC layer, the rate adaptation algorithm is not specified. This paper studies rate adaptation schemes for high rate IEEE 802.11 WLANs MAC protocol. Firstly, an Enhanced ACKnowle...
2007, 29(6): 1286-1289.
doi: 10.3724/SP.J.1146.2005.01345
Abstract:
Power allocation is an important issue of resource scheduling in OFDMA system. In this paper, an algorithm of linear water-filling power allocation is proposed through searching for a rapid means for confirming the sub-carriers which need not allocat...
Power allocation is an important issue of resource scheduling in OFDMA system. In this paper, an algorithm of linear water-filling power allocation is proposed through searching for a rapid means for confirming the sub-carriers which need not allocat...
2007, 29(6): 1290-1294.
doi: 10.3724/SP.J.1146.2005.01395
Abstract:
Based on the situation that the serving area of Gateway Location Register (GLR) is larger than that of Visitor Location Register (VLR) in three-tier database architecture in 3G network, this paper presents a novel call setup mechanism by taking consi...
Based on the situation that the serving area of Gateway Location Register (GLR) is larger than that of Visitor Location Register (VLR) in three-tier database architecture in 3G network, this paper presents a novel call setup mechanism by taking consi...
2007, 29(6): 1295-1298.
doi: 10.3724/SP.J.1146.2005.01428
Abstract:
In this paper, a distributed resource allocation scheme is developed for OFDMA cellular systems in a downlink transmission. The major impairments considered are co-channel interference and frequency selective fading. The allocation problem includes a...
In this paper, a distributed resource allocation scheme is developed for OFDMA cellular systems in a downlink transmission. The major impairments considered are co-channel interference and frequency selective fading. The allocation problem includes a...
2007, 29(6): 1299-1303.
doi: 10.3724/SP.J.1146.2005.01402
Abstract:
According to OSI model, the no-cooperation characteristics of nodes and the importance of cooperation mechanism in wireless Ad hoc network are presented in this paper. The key design ideas of three different cooperation mechanisms in the network laye...
According to OSI model, the no-cooperation characteristics of nodes and the importance of cooperation mechanism in wireless Ad hoc network are presented in this paper. The key design ideas of three different cooperation mechanisms in the network laye...
2007, 29(6): 1304-1309.
doi: 10.3724/SP.J.1146.2005.01274
Abstract:
A new synthesis method of network traffic, stable CPC noise, is proposed in this paper. The method can approximate the infinitely divisible cascades model of traffic. It is testified that sequences generated using the method can simulate real network...
A new synthesis method of network traffic, stable CPC noise, is proposed in this paper. The method can approximate the infinitely divisible cascades model of traffic. It is testified that sequences generated using the method can simulate real network...
2007, 29(6): 1310-1313.
doi: 10.3724/SP.J.1146.2005.01411
Abstract:
In this paper, a reformed MC-CDMA scheme is proposed, which choose the symbol period transmitted multiple the chip period. This allows each subcarrier undergoes frequency selective fading channel and avoids the limitation on the chip rate and symbol ...
In this paper, a reformed MC-CDMA scheme is proposed, which choose the symbol period transmitted multiple the chip period. This allows each subcarrier undergoes frequency selective fading channel and avoids the limitation on the chip rate and symbol ...
2007, 29(6): 1314-1318.
doi: 10.3724/SP.J.1146.2005.01559
Abstract:
This paper proposes an improved reverse link common rate control algorithm in CDMA system from practical utilization aspect. In this scheme, packet data service mobile controls its data rate to rise or decrease according to the change of Outer-Loop P...
This paper proposes an improved reverse link common rate control algorithm in CDMA system from practical utilization aspect. In this scheme, packet data service mobile controls its data rate to rise or decrease according to the change of Outer-Loop P...
2007, 29(6): 1319-1323.
doi: 10.3724/SP.J.1146.2005.01295
Abstract:
According to the features of TD-SCDMA system, a new MIMO structure of TD-SCDMA system based on midamble sequences is proposed. Furthermore, by combining Turbo iterative equalization and MIMO technology, MMSE-IC detection and MMSE-IC-Turbo detection a...
According to the features of TD-SCDMA system, a new MIMO structure of TD-SCDMA system based on midamble sequences is proposed. Furthermore, by combining Turbo iterative equalization and MIMO technology, MMSE-IC detection and MMSE-IC-Turbo detection a...
2007, 29(6): 1324-1327.
doi: 10.3724/SP.J.1146.2005.01473
Abstract:
This paper presents a new HF hopping system, which is called Differential Frequency Hopping (DFH) system. The frequencies transition function and the method of signal detection are the key technologies in this system. Detection and receiving symbol b...
This paper presents a new HF hopping system, which is called Differential Frequency Hopping (DFH) system. The frequencies transition function and the method of signal detection are the key technologies in this system. Detection and receiving symbol b...
2007, 29(6): 1328-1331.
doi: 10.3724/SP.J.1146.2005.01305
Abstract:
A novel nonlinear adaptive prediction approach based on truncated Laguerre memory structure is proposed to effectively suppress NarrowBand Interference (NBI) in Direct Sequence Spread Spectrum (DSSS). The memory depth can be uncoupled with the filter...
A novel nonlinear adaptive prediction approach based on truncated Laguerre memory structure is proposed to effectively suppress NarrowBand Interference (NBI) in Direct Sequence Spread Spectrum (DSSS). The memory depth can be uncoupled with the filter...
2007, 29(6): 1332-1337.
doi: 10.3724/SP.J.1146.2006.00429
Abstract:
A high performance SDRAM controller for HDTV video decoder is proposed. Configured with multiple ports and integrated with an arbitration function, the SDRAM controller proposed can be used in place of traditional structures of bus + DMA to share the...
A high performance SDRAM controller for HDTV video decoder is proposed. Configured with multiple ports and integrated with an arbitration function, the SDRAM controller proposed can be used in place of traditional structures of bus + DMA to share the...
2007, 29(6): 1338-1342.
doi: 10.3724/SP.J.1146.2005.01193
Abstract:
Through analyzing visual differences between cartoon and other videos, 8 groups of typical features including MPEG-7 descriptors are extracted to construct the feature space of cartoon videos. Then, a content-based video classifier is designed by int...
Through analyzing visual differences between cartoon and other videos, 8 groups of typical features including MPEG-7 descriptors are extracted to construct the feature space of cartoon videos. Then, a content-based video classifier is designed by int...
2007, 29(6): 1343-1347.
doi: 10.3724/SP.J.1146.2006.00326
Abstract:
This paper analyzes the relationship between the Sampling Rate (SR) and Sampling Loss Rate of Elephant Flows (SLREF) of hardflow. Then two improved algorithms are proposed to reduce the ratio of SLREF to SR(rd ). The relative error and the parameters...
This paper analyzes the relationship between the Sampling Rate (SR) and Sampling Loss Rate of Elephant Flows (SLREF) of hardflow. Then two improved algorithms are proposed to reduce the ratio of SLREF to SR(rd ). The relative error and the parameters...
2007, 29(6): 1348-1351.
doi: 10.3724/SP.J.1146.2005.01542
Abstract:
The conception of Trusted Network Connection (TNC) is introduced, and the problem of TNC protocol extend is analyzed. Direct Anonymous Attestation(DAA) protocol is descripted. After this, the paper takes out a new host Indentity based One-time Key Ex...
The conception of Trusted Network Connection (TNC) is introduced, and the problem of TNC protocol extend is analyzed. Direct Anonymous Attestation(DAA) protocol is descripted. After this, the paper takes out a new host Indentity based One-time Key Ex...
2007, 29(6): 1352-1355.
doi: 10.3724/SP.J.1146.2005.01422
Abstract:
A new weighted multimodulus blind equalization algorithm is proposed in this paper. The proposed algorithm, which combines the benefits of the MultiModulus Algorithm (MMA) and the Decision-Directed Algorithm (DDA), utilizes exponential weighted symbo...
A new weighted multimodulus blind equalization algorithm is proposed in this paper. The proposed algorithm, which combines the benefits of the MultiModulus Algorithm (MMA) and the Decision-Directed Algorithm (DDA), utilizes exponential weighted symbo...
2007, 29(6): 1356-1360.
doi: 10.3724/SP.J.1146.2005.01593
Abstract:
In MIMO-OFDM systems, data streams of multiple users can be simultaneously recovered up to a phase ambiguity when a VCMA criterion combined with a user decorrelation criterion is considered. Since a low complexity LMS algorithm is used in the iterati...
In MIMO-OFDM systems, data streams of multiple users can be simultaneously recovered up to a phase ambiguity when a VCMA criterion combined with a user decorrelation criterion is considered. Since a low complexity LMS algorithm is used in the iterati...
2007, 29(6): 1361-1364.
doi: 10.3724/SP.J.1146.2005.01315
Abstract:
Through the analysis of fractional Fourier transform of the Linear Frequency Modulation (LFM) signal, a LFM interference suppression algorithm using Time-Frequency Windowed-Short Time Fourier Transform (TFW-STFT) is proposed. Because the energy of LF...
Through the analysis of fractional Fourier transform of the Linear Frequency Modulation (LFM) signal, a LFM interference suppression algorithm using Time-Frequency Windowed-Short Time Fourier Transform (TFW-STFT) is proposed. Because the energy of LF...
2007, 29(6): 1365-1368.
doi: 10.3724/SP.J.1146.2005.01328
Abstract:
Finite plane LDPC codes are important structured LDPC codes, which have excellent performance under iterative decoding algorithm. It is a key problem that to evaluate the performance of LDPC codes under iterative decoding. Recently, the stopping sets...
Finite plane LDPC codes are important structured LDPC codes, which have excellent performance under iterative decoding algorithm. It is a key problem that to evaluate the performance of LDPC codes under iterative decoding. Recently, the stopping sets...
2007, 29(6): 1369-1372.
doi: 10.3724/SP.J.1146.2005.01408
Abstract:
This paper introduces a new particle filter for nonlinear and non-Gaussian systems.The divided difference filter based on numerical integration is used for generating the importance density functions.As it integrates the new observations into system ...
This paper introduces a new particle filter for nonlinear and non-Gaussian systems.The divided difference filter based on numerical integration is used for generating the importance density functions.As it integrates the new observations into system ...
2007, 29(6): 1373-1376.
doi: 10.3724/SP.J.1146.2005.01424
Abstract:
A 2-D DOA estimation algorithm for coherent signal is presented based on plane array in this paper, firstly the plane array is divided into three sub-arrays with the nature of rotational invariance and three kinds of data matrix is formed for each of...
A 2-D DOA estimation algorithm for coherent signal is presented based on plane array in this paper, firstly the plane array is divided into three sub-arrays with the nature of rotational invariance and three kinds of data matrix is formed for each of...
2007, 29(6): 1377-1379.
doi: 10.3724/SP.J.1146.2005.01300
Abstract:
In this paper, a complex Linear FM (LFM) signal model is given, and a transform called Cyclic- Correlation Transform (CCT) is introduced. Then, a new method combining CCT with clean technique for multipath LFM signal detection and parameter estimatio...
In this paper, a complex Linear FM (LFM) signal model is given, and a transform called Cyclic- Correlation Transform (CCT) is introduced. Then, a new method combining CCT with clean technique for multipath LFM signal detection and parameter estimatio...
2007, 29(6): 1380-1383.
doi: 10.3724/SP.J.1146.2005.01333
Abstract:
In order to make full use of the cell information and decrease CFAR loss, A new CFAR detector (MOSUM-CFAR) based on unbiased minimum-variance estimation and ordered statistics estimation is presented in this paper . It takes the sum of UMVE of leadin...
In order to make full use of the cell information and decrease CFAR loss, A new CFAR detector (MOSUM-CFAR) based on unbiased minimum-variance estimation and ordered statistics estimation is presented in this paper . It takes the sum of UMVE of leadin...
2007, 29(6): 1384-1388.
doi: 10.3724/SP.J.1146.2005.01316
Abstract:
A novel model compensation method is proposed, which integrates the Vector Taylor Series (VTS) approach with a robust feature extraction technique called SNR-dependent Non-uniform Spectral Compression (SNSC). The SNSC method is a spectral operation o...
A novel model compensation method is proposed, which integrates the Vector Taylor Series (VTS) approach with a robust feature extraction technique called SNR-dependent Non-uniform Spectral Compression (SNSC). The SNSC method is a spectral operation o...
2007, 29(6): 1389-1393.
doi: 10.3724/SP.J.1146.2005.01320
Abstract:
In this paper, the multiwavelet sampling theorem from Walters wavelet sampling theorem by reproducing kernel is generalized. The reconstruction function can be expressed by multiwavelet using Zak transform. Then the general case of the irregular samp...
In this paper, the multiwavelet sampling theorem from Walters wavelet sampling theorem by reproducing kernel is generalized. The reconstruction function can be expressed by multiwavelet using Zak transform. Then the general case of the irregular samp...
2007, 29(6): 1394-1398.
doi: 10.3724/SP.J.1146.2005.01326
Abstract:
One of the most important problems in Empirical Mode Decomposition (EMD) applications is mitigation of the end effect. Except Huangs patented approach several methods have been proposed. However, a final solution for this problem is yet to be found. ...
One of the most important problems in Empirical Mode Decomposition (EMD) applications is mitigation of the end effect. Except Huangs patented approach several methods have been proposed. However, a final solution for this problem is yet to be found. ...
2007, 29(6): 1399-1402.
doi: 10.3724/SP.J.1146.2005.01344
Abstract:
A novel method of analogous Fourier transform is proposed for reconstruction of multi-component signals, and the behaviors of this method are investigated. This method transforms multi-component signals, which are aliasing in frequency domain but not...
A novel method of analogous Fourier transform is proposed for reconstruction of multi-component signals, and the behaviors of this method are investigated. This method transforms multi-component signals, which are aliasing in frequency domain but not...
Optimization Design of 17/11 Biorthogonal Wavelet and Its Performance Analysis for Image Compression
2007, 29(6): 1403-1407.
doi: 10.3724/SP.J.1146.2005.01358
Abstract:
Many wavelet filter banks suitable for image coding, e.g. CDF-9/7, Winger-17/11 (W-17/11), Villasenor-6/10 and 10/18 (V-6/10 and V-10/18), have irrational coefficients, and thus require infinite computational precision to implement the corresponding ...
Many wavelet filter banks suitable for image coding, e.g. CDF-9/7, Winger-17/11 (W-17/11), Villasenor-6/10 and 10/18 (V-6/10 and V-10/18), have irrational coefficients, and thus require infinite computational precision to implement the corresponding ...
2007, 29(6): 1408-1411.
doi: 10.3724/SP.J.1146.2005.01388
Abstract:
In this paper, a new method is proposed for jamming the Linear Frequency Modulation (LFM) radar, which is based on the feature of the LFM signals processing and is named convolution jamming. The jammer receives the radar signal and convolves it with ...
In this paper, a new method is proposed for jamming the Linear Frequency Modulation (LFM) radar, which is based on the feature of the LFM signals processing and is named convolution jamming. The jammer receives the radar signal and convolves it with ...
2007, 29(6): 1412-1415.
doi: 10.3724/SP.J.1146.2005.01349
Abstract:
In this paper, a deception jamming detection scheme derived from moving target detection is proposed, which is based on dual-aperture antenna along-track interferometric SAR. Another new scheme of deception jamming detection is also investigated on t...
In this paper, a deception jamming detection scheme derived from moving target detection is proposed, which is based on dual-aperture antenna along-track interferometric SAR. Another new scheme of deception jamming detection is also investigated on t...
2007, 29(6): 1416-1420.
doi: 10.3724/SP.J.1146.2005.01381
Abstract:
Long duration integration of the interesting signal energy is a key to develop an effective detector under severe noise background in many applications. With the time-frequency concentration characteristic of the interesting signal, a new energy inte...
Long duration integration of the interesting signal energy is a key to develop an effective detector under severe noise background in many applications. With the time-frequency concentration characteristic of the interesting signal, a new energy inte...
2007, 29(6): 1421-1424.
doi: 10.3724/SP.J.1146.2005.01339
Abstract:
Based on the proposed motion error model and detailed influence analysis, with respect to different squint angle and beam width, novel motion compensation methods are presented in this paper for slightly squinted-looking SAR and highly squinted-looki...
Based on the proposed motion error model and detailed influence analysis, with respect to different squint angle and beam width, novel motion compensation methods are presented in this paper for slightly squinted-looking SAR and highly squinted-looki...
2007, 29(6): 1425-1428.
doi: 10.3724/SP.J.1146.2005.01454
Abstract:
Chirp Scaling Algorithm (CSA) is integrated with Contrast Optimization Autofocus Algorithm (COAA) via properly modifying azimuth processing of CS to incorporate COAA in it, resulting in improving airborne SAR image quality. RCMC is precisely correcte...
Chirp Scaling Algorithm (CSA) is integrated with Contrast Optimization Autofocus Algorithm (COAA) via properly modifying azimuth processing of CS to incorporate COAA in it, resulting in improving airborne SAR image quality. RCMC is precisely correcte...
2007, 29(6): 1429-1432.
doi: 10.3724/SP.J.1146.2006.00615
Abstract:
In this paper the Multi-Stage Wiener Filter (MSWF) is presented for the DOA estimation of ocean currents. For echoes scattered from ocean waves with the same velocity of flow and in the same range bin are partially correlated, first the spatial smoot...
In this paper the Multi-Stage Wiener Filter (MSWF) is presented for the DOA estimation of ocean currents. For echoes scattered from ocean waves with the same velocity of flow and in the same range bin are partially correlated, first the spatial smoot...
2007, 29(6): 1433-1436.
doi: 10.3724/SP.J.1146.2005.01525
Abstract:
Along-Track Interferometric (ATI) SAR can be used to measure the radial velocity of ground moving targets. By using distributed satellites system the metrical accuracy will be improved and the measurable radial range will be increased. The key point ...
Along-Track Interferometric (ATI) SAR can be used to measure the radial velocity of ground moving targets. By using distributed satellites system the metrical accuracy will be improved and the measurable radial range will be increased. The key point ...
2007, 29(6): 1437-1440.
doi: 10.3724/SP.J.1146.2005.01527
Abstract:
An algorithm of HF ground wave radar array calibration for amplitude and phase errors based on sea-echo is proposed in this paper. According to the relation between the adjacent antenna sea-echo responses for the same ocean cell, the equations of amp...
An algorithm of HF ground wave radar array calibration for amplitude and phase errors based on sea-echo is proposed in this paper. According to the relation between the adjacent antenna sea-echo responses for the same ocean cell, the equations of amp...
2007, 29(6): 1441-1444.
doi: 10.3724/SP.J.1146.2005.01440
Abstract:
In this paper, the satellite SAR imagery is regarded as an image which is acquired from the frame projection sensor approximately based on photogrametry theory. The satellite SAR collinearity equation is revised and a new location model is proposed. ...
In this paper, the satellite SAR imagery is regarded as an image which is acquired from the frame projection sensor approximately based on photogrametry theory. The satellite SAR collinearity equation is revised and a new location model is proposed. ...
2007, 29(6): 1445-1449.
doi: 10.3724/SP.J.1146.2005.01273
Abstract:
In this paper, a refined Secondary Range Compression (SRC) imaging algorithm for large squint air-borne Synthetic Aperture Radar (SAR) is presented. Based on the squint range mode, refined SRC algorithm for squint mode SAR is deduced directly. By com...
In this paper, a refined Secondary Range Compression (SRC) imaging algorithm for large squint air-borne Synthetic Aperture Radar (SAR) is presented. Based on the squint range mode, refined SRC algorithm for squint mode SAR is deduced directly. By com...
2007, 29(6): 1450-1454.
doi: 10.3724/SP.J.1146.2005.01544
Abstract:
Scattering center target model is widely used to describe the target electromagnetic scattering properties in optical region.It achieves good recognition performance in High Resolution Rang Profiles (HRRPs) based Radar Automatic Target Recognition (R...
Scattering center target model is widely used to describe the target electromagnetic scattering properties in optical region.It achieves good recognition performance in High Resolution Rang Profiles (HRRPs) based Radar Automatic Target Recognition (R...
2007, 29(6): 1455-1459.
doi: 10.3724/SP.J.1146.2005.01456
Abstract:
In order to demonstrate the effectiveness of GTD model, usually used to model the target scattering behaviors in optical frequency band, for target resonance band, a new method for the GTD model parameters extraction based on matching pursuits is pro...
In order to demonstrate the effectiveness of GTD model, usually used to model the target scattering behaviors in optical frequency band, for target resonance band, a new method for the GTD model parameters extraction based on matching pursuits is pro...
2007, 29(6): 1460-1463.
doi: 10.3724/SP.J.1146.2005.01563
Abstract:
Applying wavelet decomposition to build high-scale statistical model for capturing statistical difference between cover images and stego-images. However, not all wavelet statistics are able to reflect well statistical change due to hidden message emb...
Applying wavelet decomposition to build high-scale statistical model for capturing statistical difference between cover images and stego-images. However, not all wavelet statistics are able to reflect well statistical change due to hidden message emb...
2007, 29(6): 1464-1470.
doi: 10.3724/SP.J.1146.2005.01682
Abstract:
Using data fusion of multi-spectral and microwave radar images, a semiautomatic method is developed based on the level set method for application to urban road extraction. The fast marching method of level set makes data fusion. Radar remote sensing ...
Using data fusion of multi-spectral and microwave radar images, a semiautomatic method is developed based on the level set method for application to urban road extraction. The fast marching method of level set makes data fusion. Radar remote sensing ...
2007, 29(6): 1471-1475.
doi: 10.3724/SP.J.1146.2005.01355
Abstract:
Since the security of many cryptosystems relies on the apparent intractability of the computational problems, the underdetermined problem of Blind Source Separation (BSS) is used to encrypt multiple images with high security. However, due to the BSS ...
Since the security of many cryptosystems relies on the apparent intractability of the computational problems, the underdetermined problem of Blind Source Separation (BSS) is used to encrypt multiple images with high security. However, due to the BSS ...
2007, 29(6): 1476-1479.
doi: 10.3724/SP.J.1146.2005.01414
Abstract:
Based on the ergodicity of the shifters (except for all zero-states) in m-sequence generator, in this paper a new m-sequence transform method is first proposed to apply to image position permutation. Combining this method with chaotic map, a novel im...
Based on the ergodicity of the shifters (except for all zero-states) in m-sequence generator, in this paper a new m-sequence transform method is first proposed to apply to image position permutation. Combining this method with chaotic map, a novel im...
2007, 29(6): 1480-1482.
doi: 10.3724/SP.J.1146.2005.01561
Abstract:
Terrain surface is not always so perfect that it keeps invariable self-similar characteristic in whole scale space. To describe the degree of the self-similarity, the self-similarity curve is divided into several linear parts and then a new parameter...
Terrain surface is not always so perfect that it keeps invariable self-similar characteristic in whole scale space. To describe the degree of the self-similarity, the self-similarity curve is divided into several linear parts and then a new parameter...
2007, 29(6): 1483-1486.
doi: 10.3724/SP.J.1146.2005.01416
Abstract:
In this paper a new method to determine the bearings and ranges of the three highlight sections of a ship is given. This method is based on a non-typical vector sound intensity array with seven sensors. The seven sensors can all be fixing in some und...
In this paper a new method to determine the bearings and ranges of the three highlight sections of a ship is given. This method is based on a non-typical vector sound intensity array with seven sensors. The seven sensors can all be fixing in some und...
2007, 29(6): 1487-1491.
doi: 10.3724/SP.J.1146.2005.01392
Abstract:
It is a difficult problem how to detect such accident of a system. This paper presents a new algorithm, an anomaly detection algorithm based on hidden pattern. Epsilon machine, a new computational mechanics, can discover hidden pattern from the respo...
It is a difficult problem how to detect such accident of a system. This paper presents a new algorithm, an anomaly detection algorithm based on hidden pattern. Epsilon machine, a new computational mechanics, can discover hidden pattern from the respo...
2007, 29(6): 1492-1495.
doi: 10.3724/SP.J.1146.2005.01548
Abstract:
The relationships between loop performance (settling time, phase noise and spur signal) and loop parameters (bandwidth and phase margin) are briefly discussed in the paper. An adaptive Phase-Locked Loop (PLL) with a fast settling time and its key blo...
The relationships between loop performance (settling time, phase noise and spur signal) and loop parameters (bandwidth and phase margin) are briefly discussed in the paper. An adaptive Phase-Locked Loop (PLL) with a fast settling time and its key blo...
2007, 29(6): 1496-1499.
doi: 10.3724/SP.J.1146.2005.01284
Abstract:
A monolithic clock recovery circuit is proposed in this paper. The frequency of the recovered clock is 125MHz. By using of some compensation methods, such as current subtraction technology, the gain of the VCO is greatly diminished, as a result the c...
A monolithic clock recovery circuit is proposed in this paper. The frequency of the recovered clock is 125MHz. By using of some compensation methods, such as current subtraction technology, the gain of the VCO is greatly diminished, as a result the c...
2007, 29(6): 1500-1502.
doi: 10.3724/SP.J.1146.2005.01418
Abstract:
A micro-strip shorted antenna with Compact Electromagnetic Band-Gap structure (CEBG) is presented. A shorted antenna with identical dimensions on a conventional ground plane is also included, so that a direct performance comparison can be made. Measu...
A micro-strip shorted antenna with Compact Electromagnetic Band-Gap structure (CEBG) is presented. A shorted antenna with identical dimensions on a conventional ground plane is also included, so that a direct performance comparison can be made. Measu...
2007, 29(6): 1503-1507.
doi: 10.3724/SP.J.1146.2005.01304
Abstract:
The setting method of time-domain excitation sources is studied in this paper in order to analyzing the characteristic of waveguide by using the Multidomain PseudoSpectral Time-Domain (MPSTD) algorithm. Based on it, a rigorous analysis for a compound...
The setting method of time-domain excitation sources is studied in this paper in order to analyzing the characteristic of waveguide by using the Multidomain PseudoSpectral Time-Domain (MPSTD) algorithm. Based on it, a rigorous analysis for a compound...
2007, 29(6): 1508-1510.
doi: 10.3724/SP.J.1146.2005.01352
Abstract:
Bandwidth property of mode conversion from the TE□10 mode of a rectangular waveguide to the TE⊙01 mode of a coaxial waveguide is studied. The influence of mode competition on operating mode inside the bandwidth is analyzed and the effect of mode filt...
Bandwidth property of mode conversion from the TE□10 mode of a rectangular waveguide to the TE⊙01 mode of a coaxial waveguide is studied. The influence of mode competition on operating mode inside the bandwidth is analyzed and the effect of mode filt...
2007, 29(6): 1514-1517.
doi: 10.3724/SP.J.1146.2005.01092
Abstract:
Blind synchronization algorithm is developed for estimating jointly timing and carrier frequency offset of Lattice Orthogonal Frequency Division Multiplexing (LOFDM) systems, which is based on the cyclostationarity of LOFDM signals. The theoretical a...
Blind synchronization algorithm is developed for estimating jointly timing and carrier frequency offset of Lattice Orthogonal Frequency Division Multiplexing (LOFDM) systems, which is based on the cyclostationarity of LOFDM signals. The theoretical a...
2007, 29(6): 1518-1520.
doi: 10.3724/SP.J.1146.2006.01201
Abstract:
How to distinguish the ghost-mode in window is illuminated at first and then the method is introduced using Microwave Studio, a three-dimension simulating soft, to improve a X-band output window. The data of calculation and test are very good and the...
How to distinguish the ghost-mode in window is illuminated at first and then the method is introduced using Microwave Studio, a three-dimension simulating soft, to improve a X-band output window. The data of calculation and test are very good and the...
2007, 29(6): 1521-1524.
doi: 10.3724/SP.J.1146.2005.01384
Abstract:
In this paper reaction wheels inner friction and static and dynamic imbalance are particularly analysed by reaction wheels dynamics. A mathematical model is set up. A method of control disturb is used. for example, the method to estimate the inner fr...
In this paper reaction wheels inner friction and static and dynamic imbalance are particularly analysed by reaction wheels dynamics. A mathematical model is set up. A method of control disturb is used. for example, the method to estimate the inner fr...
2007, 29(6): 1511-1513.
doi: 10.3724/SP.J.1146.2005.01046
Abstract:
In 2005, Zhang et al. proposed an efficient group signature scheme based on RSA, the total computation cost of signature and verification requires only 9 modular exponentiations. This paper will show that Zhang et al.s scheme is insecure, any group m...
In 2005, Zhang et al. proposed an efficient group signature scheme based on RSA, the total computation cost of signature and verification requires only 9 modular exponentiations. This paper will show that Zhang et al.s scheme is insecure, any group m...
