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2005 Vol. 27, No. 6
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2005, 27(6): 841-844.
Abstract:
In order to overcome the near-far problem encountered in CDMA mobile location estimation, in this paper a mobile location method to utilize an antenna array and TSOA/AOA hybrid location technique is proposed, the GDOP distribution of different locati...
In order to overcome the near-far problem encountered in CDMA mobile location estimation, in this paper a mobile location method to utilize an antenna array and TSOA/AOA hybrid location technique is proposed, the GDOP distribution of different locati...
2005, 27(6): 845-850.
Abstract:
This paper presents a multiuser detection algorithm for the frequency hopping MFSK (M-ary Frequency Shift Keying) multiple access systems under the assumption of ideal power control. By detecting and classifying the energy levels in the frequency hop...
This paper presents a multiuser detection algorithm for the frequency hopping MFSK (M-ary Frequency Shift Keying) multiple access systems under the assumption of ideal power control. By detecting and classifying the energy levels in the frequency hop...
2005, 27(6): 851-856.
Abstract:
WCDMA needs to extend its downlink data rate to lOMbps or more because of the growing demand of the Internet and multimedia services. High Speed Downlink Packet Access (HSDPA) has been proposed to offer such high data rates in WCDMA technology within...
WCDMA needs to extend its downlink data rate to lOMbps or more because of the growing demand of the Internet and multimedia services. High Speed Downlink Packet Access (HSDPA) has been proposed to offer such high data rates in WCDMA technology within...
2005, 27(6): 857-860.
Abstract:
Against the character of HF channels, this paper presents an OFDM synchronization detection scheme, which uses m sequence to modulate the pilot symbols. Based on joint time and frequency-offset estimation, synchronization detection can be implemented...
Against the character of HF channels, this paper presents an OFDM synchronization detection scheme, which uses m sequence to modulate the pilot symbols. Based on joint time and frequency-offset estimation, synchronization detection can be implemented...
2005, 27(6): 861-864.
Abstract:
The influence of Doppler shifts on traditional acquisition algorithms is analyzed. A new method for spread-spectrum code acquisition of pilot symbols in the presence of large Doppler shifts is proposed, in which the outputs of partial matched filters...
The influence of Doppler shifts on traditional acquisition algorithms is analyzed. A new method for spread-spectrum code acquisition of pilot symbols in the presence of large Doppler shifts is proposed, in which the outputs of partial matched filters...
2005, 27(6): 865-869.
Abstract:
This paper proposes a hierarchical coding technique based on the All Phase Inverse Discrete Cosine Transform (APIDCT) interpolation. The All Phase Digital Filter (APDF) is a new type of linear phase filter. This paper compares the performances of sev...
This paper proposes a hierarchical coding technique based on the All Phase Inverse Discrete Cosine Transform (APIDCT) interpolation. The All Phase Digital Filter (APDF) is a new type of linear phase filter. This paper compares the performances of sev...
2005, 27(6): 870-873.
Abstract:
The differential provable security of a kind of unbalanced Feistel networks is investigated deeply. The structure of the differential correspondence between round functions whose differential probability is nonzero is given. A distribution of m seque...
The differential provable security of a kind of unbalanced Feistel networks is investigated deeply. The structure of the differential correspondence between round functions whose differential probability is nonzero is given. A distribution of m seque...
2005, 27(6): 874-878.
Abstract:
Through analyzing the nature of the evolution of the deterministic chaos and partitioning its state space, a deterministic chaotic system can be turned into an ergodic information source which could be used to design a Random Number Generator(RNG). T...
Through analyzing the nature of the evolution of the deterministic chaos and partitioning its state space, a deterministic chaotic system can be turned into an ergodic information source which could be used to design a Random Number Generator(RNG). T...
2005, 27(6): 879-883.
Abstract:
In this paper, a novel method of calculating the correlative dimension of time-series is proposed. With this method, the fractal scaleless band of time-series can be identified and the correlative dimension of time series can be calculated according ...
In this paper, a novel method of calculating the correlative dimension of time-series is proposed. With this method, the fractal scaleless band of time-series can be identified and the correlative dimension of time series can be calculated according ...
2005, 27(6): 884-887.
Abstract:
In speech signal transmission system, residual redundancy is still left in the parameters after source encoding. The redundancy includes non-uniform distribution and time correlation of subsequent frame. Exploiting the redundancy on bit-level, the pa...
In speech signal transmission system, residual redundancy is still left in the parameters after source encoding. The redundancy includes non-uniform distribution and time correlation of subsequent frame. Exploiting the redundancy on bit-level, the pa...
2005, 27(6): 888-891.
Abstract:
This paper analyzes theoretically the properties of Turbo codes and the effects of the interleaver. Some elements for devising good interleaver are pointed out in this paper. Compared with some traditional algorithms, a low-complexity method based on...
This paper analyzes theoretically the properties of Turbo codes and the effects of the interleaver. Some elements for devising good interleaver are pointed out in this paper. Compared with some traditional algorithms, a low-complexity method based on...
2005, 27(6): 892-895.
Abstract:
The offset of gain filter is dealt unsuitably with a constant 32dB in G.728 standard. That is, the short-term stationary speech signal during the duration 20~30ms is unsuitably supposed as stationary at whole time axis. It is necessary to design opti...
The offset of gain filter is dealt unsuitably with a constant 32dB in G.728 standard. That is, the short-term stationary speech signal during the duration 20~30ms is unsuitably supposed as stationary at whole time axis. It is necessary to design opti...
2005, 27(6): 896-899.
Abstract:
Based on the analysis of the effect on the linearization about the measurement equation and state equation, aimed to some system with linear state equation, a new algorithm named as Transforming State Space Extended Kalman Filter (TSS-EKF) is propose...
Based on the analysis of the effect on the linearization about the measurement equation and state equation, aimed to some system with linear state equation, a new algorithm named as Transforming State Space Extended Kalman Filter (TSS-EKF) is propose...
2005, 27(6): 900-904.
Abstract:
In the applications of wavelet, it is the most difficult and cumbrous to select the suitable wavelet bases. In this paper, a general construction method of biorthogonal bases of perfect reconstruction wavelet is proposed by using the transmission fun...
In the applications of wavelet, it is the most difficult and cumbrous to select the suitable wavelet bases. In this paper, a general construction method of biorthogonal bases of perfect reconstruction wavelet is proposed by using the transmission fun...
2005, 27(6): 905-907.
Abstract:
The correlation dimension is an important parameter for describing a chaotic signal. The method of extracting the correlation dimension is deeply researched in this paper. Based on the GP method, an improved algorithm of extracting the correlation di...
The correlation dimension is an important parameter for describing a chaotic signal. The method of extracting the correlation dimension is deeply researched in this paper. Based on the GP method, an improved algorithm of extracting the correlation di...
2005, 27(6): 908-913.
Abstract:
In this paper, by using the advantage of an extremely efficient and highly parallelizable algorithm deriving from the multiscaie stochastic model to deal with a lot of practical problem, a general qth-order tree-based method for multiscale modeling o...
In this paper, by using the advantage of an extremely efficient and highly parallelizable algorithm deriving from the multiscaie stochastic model to deal with a lot of practical problem, a general qth-order tree-based method for multiscale modeling o...
2005, 27(6): 914-918.
Abstract:
It is the first time to expound the watermark application under images uniting in this paper. With the affecting of JPEG lossy compressing, the universal solving scheme is proposed, and the corresponding security analysis is made. In the direction of...
It is the first time to expound the watermark application under images uniting in this paper. With the affecting of JPEG lossy compressing, the universal solving scheme is proposed, and the corresponding security analysis is made. In the direction of...
2005, 27(6): 919-923.
Abstract:
Under the requirement of running control system of remote sensing satellite station system, a running control scheme of information processing of station system based on message queues middleware - IBM WebShpere MQ is proposed. And the scheme is appl...
Under the requirement of running control system of remote sensing satellite station system, a running control scheme of information processing of station system based on message queues middleware - IBM WebShpere MQ is proposed. And the scheme is appl...
2005, 27(6): 924-927.
Abstract:
In this paper, a remote sensing images matching method based on Zernike moments and steady genetic algorithms is proposed. Genetic algorithms, which are rapid and efficient in global finding optima, are used to match the images. Considering rotation ...
In this paper, a remote sensing images matching method based on Zernike moments and steady genetic algorithms is proposed. Genetic algorithms, which are rapid and efficient in global finding optima, are used to match the images. Considering rotation ...
2005, 27(6): 928-931.
Abstract:
Different data sets relative to the same scene acquired with different view angles can be exploited to improve slant-range resolution of SAR in broadside mode. Distributed satellites SAR is a special kind of SAR system, whose transmitters and receive...
Different data sets relative to the same scene acquired with different view angles can be exploited to improve slant-range resolution of SAR in broadside mode. Distributed satellites SAR is a special kind of SAR system, whose transmitters and receive...
2005, 27(6): 932-935.
Abstract:
Motion error problem for airborne formation flying InSAR is analyzed. The plane interval changes (across track baseline changes) are discussed in three situations: interval increasing, interval decreasing, interval changing according to sine curve. P...
Motion error problem for airborne formation flying InSAR is analyzed. The plane interval changes (across track baseline changes) are discussed in three situations: interval increasing, interval decreasing, interval changing according to sine curve. P...
2005, 27(6): 936-938.
Abstract:
SAR with Displaced Phase Centers multibeam in Azimuth (DPCA) can solve the confliction between swath width and resolution, but this mode is one Pulse Repetition Frequency (PRF) restriction. In this paper, the spectrum of the signal in the azimuth dir...
SAR with Displaced Phase Centers multibeam in Azimuth (DPCA) can solve the confliction between swath width and resolution, but this mode is one Pulse Repetition Frequency (PRF) restriction. In this paper, the spectrum of the signal in the azimuth dir...
2005, 27(6): 939-942.
Abstract:
The moving parts of an aircraft, such as rotor blades, propeller blades, and jet engine compressor and turbine blades, cause a periodic modulation on the radar return signals. Though this periodic modulation can sometimes effect the Doppler tracking ...
The moving parts of an aircraft, such as rotor blades, propeller blades, and jet engine compressor and turbine blades, cause a periodic modulation on the radar return signals. Though this periodic modulation can sometimes effect the Doppler tracking ...
2005, 27(6): 943-947.
Abstract:
A MAC protocol, termed Dual Busy Tone Multiple Access(DBTMA), is a random access mechanism with high channel utilization for WLAN. However, it is difficult to realize the protocol with hardware. This paper proposes a new random access mechanism based...
A MAC protocol, termed Dual Busy Tone Multiple Access(DBTMA), is a random access mechanism with high channel utilization for WLAN. However, it is difficult to realize the protocol with hardware. This paper proposes a new random access mechanism based...
2005, 27(6): 948-951.
Abstract:
In this paper, a Dynamic Shared-Path Protection (DSPP) algorithm is proposed for double-link failures in WDM mesh networks on the condition that all links are assumed to be Share Risk Link Group (SRLG) disjoint. DSPP can dynamically adjust the link-c...
In this paper, a Dynamic Shared-Path Protection (DSPP) algorithm is proposed for double-link failures in WDM mesh networks on the condition that all links are assumed to be Share Risk Link Group (SRLG) disjoint. DSPP can dynamically adjust the link-c...
2005, 27(6): 952-956.
Abstract:
Finding the path satisfying two additive QoS constraints is the key question of QoS research. The linear search algorithm is one of important approximation algorithms. This paper proposes a new linear search algorithm combined with the reverse optimi...
Finding the path satisfying two additive QoS constraints is the key question of QoS research. The linear search algorithm is one of important approximation algorithms. This paper proposes a new linear search algorithm combined with the reverse optimi...
2005, 27(6): 957-961.
Abstract:
To deploy a multi-cell 802.11 wireless LAN system, Access Point(AP) placement and channel assignment are two primaiy design issues. For a given set of traffic demands, maximizing not only the overall system throughput, but also the fairness in resour...
To deploy a multi-cell 802.11 wireless LAN system, Access Point(AP) placement and channel assignment are two primaiy design issues. For a given set of traffic demands, maximizing not only the overall system throughput, but also the fairness in resour...
2005, 27(6): 962-966.
Abstract:
A novel medium access control algorithm is proposed in this paper. With the information of nodes Multi-Packet Reception (MPR) ability and the seeds used for producing the scheduling list, the optimal probability to access channel is determined, and t...
A novel medium access control algorithm is proposed in this paper. With the information of nodes Multi-Packet Reception (MPR) ability and the seeds used for producing the scheduling list, the optimal probability to access channel is determined, and t...
2005, 27(6): 967-972.
Abstract:
The Medium Access Control (MAC) mechanism plays a key role on supporting Quality of Service (QoS) in wireless ad hoc networks. Based on the analysis to Packet Reservation Multiple Access (PRMA), this paper gives a new MAC scheme, Distributed- PRMA (D...
The Medium Access Control (MAC) mechanism plays a key role on supporting Quality of Service (QoS) in wireless ad hoc networks. Based on the analysis to Packet Reservation Multiple Access (PRMA), this paper gives a new MAC scheme, Distributed- PRMA (D...
2005, 27(6): 973-977.
Abstract:
Protection switching is a key technique in Resilient Packet Ring(RPR). Although current protection switching scheme defined in 1EEE802.17 draft can provide sub-50ms protection switching time, it can not ensure QoS of real time service. To solve this ...
Protection switching is a key technique in Resilient Packet Ring(RPR). Although current protection switching scheme defined in 1EEE802.17 draft can provide sub-50ms protection switching time, it can not ensure QoS of real time service. To solve this ...
2005, 27(6): 978-982.
Abstract:
The rapid development of E-business network management has been promoting the broad applications on multi-mobile agents system. However, it made routing security management of this system more complex and flexible. Aimed at multi-mobile agents system...
The rapid development of E-business network management has been promoting the broad applications on multi-mobile agents system. However, it made routing security management of this system more complex and flexible. Aimed at multi-mobile agents system...
2005, 27(6): 983-986.
Abstract:
The number of linear independent steering vectors effected by an ElectroMagnetic (EM) Vector Sensor (VS) and an EMVS array in cumulant domain is investigated in this paper. The upper bound and the lower bound for the number of linear independent stee...
The number of linear independent steering vectors effected by an ElectroMagnetic (EM) Vector Sensor (VS) and an EMVS array in cumulant domain is investigated in this paper. The upper bound and the lower bound for the number of linear independent stee...
2005, 27(6): 987-990.
Abstract:
The analytical solution of spherical vector wave functions of electromagnetic fields in s-concentric homogeneous plasma anisotropic spheres is expanded in this paper. Applying the continuous boundary conditions of electromagnetic fields in (s-1) plas...
The analytical solution of spherical vector wave functions of electromagnetic fields in s-concentric homogeneous plasma anisotropic spheres is expanded in this paper. Applying the continuous boundary conditions of electromagnetic fields in (s-1) plas...
2005, 27(6): 991-994.
Abstract:
A method obtaining broad-band EGB(Electromagnetic Band-Gap) Structure is studied in this paper. The simulated results show that the band-width of band-gap is enlarged using method of changing period linearly, and the smoothness of pass band and band-...
A method obtaining broad-band EGB(Electromagnetic Band-Gap) Structure is studied in this paper. The simulated results show that the band-width of band-gap is enlarged using method of changing period linearly, and the smoothness of pass band and band-...
2005, 27(6): 995-998.
Abstract:
A method to effectively measure the microwave field distribution is proposed in this paper. Firstly, to quantitatively measure the intense microwave field power distribution, a measurement container and a multiplex temperature sampling and processing...
A method to effectively measure the microwave field distribution is proposed in this paper. Firstly, to quantitatively measure the intense microwave field power distribution, a measurement container and a multiplex temperature sampling and processing...
2005, 27(6): 999-1001.
Abstract:
The dynamic measurement scheme based on single camera for the airborne InSAR baseline is described in this paper. In the above measurement scheme, the calibrated camera is mainly responsible for taking pictures on the pre-designed legends on the ante...
The dynamic measurement scheme based on single camera for the airborne InSAR baseline is described in this paper. In the above measurement scheme, the calibrated camera is mainly responsible for taking pictures on the pre-designed legends on the ante...
2005, 27(6): 1002-1004.
Abstract:
Decision Feedback Equalizer (DFE) is widely used in practice, which is usually designed according to Minimum Mean Square Error (MMSE) criterion. A novel method is derived for calculating the DFE coefficients based on quadratic programming. Simulation...
Decision Feedback Equalizer (DFE) is widely used in practice, which is usually designed according to Minimum Mean Square Error (MMSE) criterion. A novel method is derived for calculating the DFE coefficients based on quadratic programming. Simulation...
2005, 27(6): 1005-1008.
Abstract:
Adaptive modulation can improve the system performance with high spectral efficiency. In this paper, a combining scheme of MC-CDMA and adaptive modulation is proposed in order to achieve the frequency diversity and the spectral efficiency without los...
Adaptive modulation can improve the system performance with high spectral efficiency. In this paper, a combining scheme of MC-CDMA and adaptive modulation is proposed in order to achieve the frequency diversity and the spectral efficiency without los...
