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1998 Vol. 20, No. 4
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1998, 20(4): 433-439.
Abstract:
Based on the recently developed chaos and multifractal theory,this paper introduces new methods for radar signal processing,radar targete characteristic analysing and radar target recognition.The Lyapunov exponents are calculated.With the correlation...
Based on the recently developed chaos and multifractal theory,this paper introduces new methods for radar signal processing,radar targete characteristic analysing and radar target recognition.The Lyapunov exponents are calculated.With the correlation...
1998, 20(4): 440-444.
Abstract:
A new method for radar target recognition based on modular neural networks is reported in this paper.In this method,the response from an unknown target is first sent to several waveform predicators that the some BP neural networks trained by response...
A new method for radar target recognition based on modular neural networks is reported in this paper.In this method,the response from an unknown target is first sent to several waveform predicators that the some BP neural networks trained by response...
1998, 20(4): 445-452.
Abstract:
For linear and non-linear frequency modulation (LFM/NLFM) signals with large time-bandwidth product (TB),radar super-resolution in range domain at low SNR is investigated.A novel signal enhancement algorithm based on FFT for LFM/NLFM signals used for...
For linear and non-linear frequency modulation (LFM/NLFM) signals with large time-bandwidth product (TB),radar super-resolution in range domain at low SNR is investigated.A novel signal enhancement algorithm based on FFT for LFM/NLFM signals used for...
1998, 20(4): 453-457.
Abstract:
In this paper, a PD radar signal is researched, which is modulated by randomly staggered pulse sequence whose phase is also modulated by random binary-phase code. The expression of its ambiguity function is firstly presented, the main derived method ...
In this paper, a PD radar signal is researched, which is modulated by randomly staggered pulse sequence whose phase is also modulated by random binary-phase code. The expression of its ambiguity function is firstly presented, the main derived method ...
1998, 20(4): 458-463.
Abstract:
This paper analyzed the principle of maximum entropy method in QCW radar, advanced the requirements of the maximum entropy spectral estimation in test radar system, designed and implemented the arithmetic unit by C31 chip, and accomplished real-time ...
This paper analyzed the principle of maximum entropy method in QCW radar, advanced the requirements of the maximum entropy spectral estimation in test radar system, designed and implemented the arithmetic unit by C31 chip, and accomplished real-time ...
1998, 20(4): 464-467.
Abstract:
In this paper a mutual coupling calibration method suitable for uniform linear arrays is presented where only one known calibration source in the near field is necessary for effective calibration, which can be extended to the case of uniform circular...
In this paper a mutual coupling calibration method suitable for uniform linear arrays is presented where only one known calibration source in the near field is necessary for effective calibration, which can be extended to the case of uniform circular...
1998, 20(4): 468-473.
Abstract:
In this paper, the problem of optimal reception of partially polarized signals is investigated by means of Stokes vector description of EM waves. The receiving antenna s global optimal polarizations are derived using Lagrange multiplier method with S...
In this paper, the problem of optimal reception of partially polarized signals is investigated by means of Stokes vector description of EM waves. The receiving antenna s global optimal polarizations are derived using Lagrange multiplier method with S...
1998, 20(4): 474-479.
Abstract:
The performance analysis of quadrature correlation detection algorithm for DS-SS signal is presented. The algorithm can detect effectively both BPSK and QPSK spread spectrum signals. The analytical results are confirmed by computer simulation. The si...
The performance analysis of quadrature correlation detection algorithm for DS-SS signal is presented. The algorithm can detect effectively both BPSK and QPSK spread spectrum signals. The analytical results are confirmed by computer simulation. The si...
1998, 20(4): 480-485.
Abstract:
In this paper,the updating equations of FBLMS and UFBLMS algorithms are transformed into the time domain,then two algorithms(FOBA and UFOBA) are presented by employing time-varying convergence factors which are optimized in a least-square(LS) sense r...
In this paper,the updating equations of FBLMS and UFBLMS algorithms are transformed into the time domain,then two algorithms(FOBA and UFOBA) are presented by employing time-varying convergence factors which are optimized in a least-square(LS) sense r...
1998, 20(4): 486-491.
Abstract:
A block feature matching (BFM) criterion function used for block motion estimation in some the international standards such as H.261, H.263, MPEG1, MPEG2, and HDTV codecs, is proposed in this paper. The complexity and VLSI implementation of real-time...
A block feature matching (BFM) criterion function used for block motion estimation in some the international standards such as H.261, H.263, MPEG1, MPEG2, and HDTV codecs, is proposed in this paper. The complexity and VLSI implementation of real-time...
1998, 20(4): 492-499.
Abstract:
A motion adaptive frame interpolation algorithm for progressive frame rate conversion of digital video systems is proposed. Firstly a motion vector is searched for each pixel in the interpolated frame using the block-matching search method of linear ...
A motion adaptive frame interpolation algorithm for progressive frame rate conversion of digital video systems is proposed. Firstly a motion vector is searched for each pixel in the interpolated frame using the block-matching search method of linear ...
1998, 20(4): 500-507.
Abstract:
In this paper, The properties of Tseng runs in RCF of a binary sequence are studied. The relation between Tseng runs and run numbers of different run lengths in sequence are derived, and some new conceptions: run catena, concatenated elements, etc., ...
In this paper, The properties of Tseng runs in RCF of a binary sequence are studied. The relation between Tseng runs and run numbers of different run lengths in sequence are derived, and some new conceptions: run catena, concatenated elements, etc., ...
1998, 20(4): 508-514.
Abstract:
In this paper, the definition and properties of Line Spectral Frequency(LSF) parameters are introduced briefly. An efficient solution method of obtaining LSF parameters is presented. A new Split Vector Quantizer(SVQ) of LSF parameters is designed in ...
In this paper, the definition and properties of Line Spectral Frequency(LSF) parameters are introduced briefly. An efficient solution method of obtaining LSF parameters is presented. A new Split Vector Quantizer(SVQ) of LSF parameters is designed in ...
1998, 20(4): 515-518.
Abstract:
The chaotic sequence is sensitively dependent on initial conditions and parameters of the chaotic system. This paper, firstly, presents a multiple access communications system model which is based on chaotic sequence; Secondly, introduces a chaotic c...
The chaotic sequence is sensitively dependent on initial conditions and parameters of the chaotic system. This paper, firstly, presents a multiple access communications system model which is based on chaotic sequence; Secondly, introduces a chaotic c...
1998, 20(4): 519-526.
Abstract:
An exact matrix-geometric solutions using Geom/PH/1/K queueing model are presented for analysing a backpressure input/output queueing ATM (Asynchronous Transfer Mode) switch under uniform traffic. It shows valuable results for designing a broadband p...
An exact matrix-geometric solutions using Geom/PH/1/K queueing model are presented for analysing a backpressure input/output queueing ATM (Asynchronous Transfer Mode) switch under uniform traffic. It shows valuable results for designing a broadband p...
1998, 20(4): 527-530.
Abstract:
Hash algorithm is always with high operation speed such as MDx, SHA. A natural problem is that could one apply for a fast hash scheme to construct a cipher block algorithm. This paper denotes such a problem as dual problem of hash algorithm. Based on...
Hash algorithm is always with high operation speed such as MDx, SHA. A natural problem is that could one apply for a fast hash scheme to construct a cipher block algorithm. This paper denotes such a problem as dual problem of hash algorithm. Based on...
1998, 20(4): 531-537.
Abstract:
A new algorithm for symbol timing recovery using baudrate sampling is presented, which does not demand strict requirements for the AGC circuit in the front part. Simulations show that estimate performance can be greatly improved using this algorithm.
A new algorithm for symbol timing recovery using baudrate sampling is presented, which does not demand strict requirements for the AGC circuit in the front part. Simulations show that estimate performance can be greatly improved using this algorithm.
1998, 20(4): 538-545.
Abstract:
This paper presents a systematic and rigorous discussion for the solution of maximum power transmission between two plannar aperture antennas using a Rayleigh quotient for the power transmission efficiency established in the paper. An analytical solu...
This paper presents a systematic and rigorous discussion for the solution of maximum power transmission between two plannar aperture antennas using a Rayleigh quotient for the power transmission efficiency established in the paper. An analytical solu...
1998, 20(4): 546-553.
Abstract:
Numerical models for the physical parameters and physical effects about numerical simulation of low-temperature bipolar transistor are discussed. The numerical approaches required for simulation of low-temperature behavior are presented. A simulation...
Numerical models for the physical parameters and physical effects about numerical simulation of low-temperature bipolar transistor are discussed. The numerical approaches required for simulation of low-temperature behavior are presented. A simulation...
1998, 20(4): 554-557.
Abstract:
A new soft-output algorithm of decoding is derived from the Bahl algorithm. The complex operations of estimating posterior probabilities and difference metric in the Bahl algorithm are paralleled and well formulated into a set of simple matrix operat...
A new soft-output algorithm of decoding is derived from the Bahl algorithm. The complex operations of estimating posterior probabilities and difference metric in the Bahl algorithm are paralleled and well formulated into a set of simple matrix operat...
1998, 20(4): 558-561.
Abstract:
criterion for designing chaotic spreading sequences based on symbolic dynamics is proposed. A family of mutually independent Bernoulli sequences can be generated by this approach. A condition for the metric entropy to obtain q-ary Bernoulli sequences...
criterion for designing chaotic spreading sequences based on symbolic dynamics is proposed. A family of mutually independent Bernoulli sequences can be generated by this approach. A condition for the metric entropy to obtain q-ary Bernoulli sequences...
1998, 20(4): 562-565.
Abstract:
A new vector quantization(VQ) approach based on genetic algorithm(GA) is presented in this paper. VQ codebook design is essentially a classification of training vectors. Because of GA s global optimum ability, using GA for codebook training can obsta...
A new vector quantization(VQ) approach based on genetic algorithm(GA) is presented in this paper. VQ codebook design is essentially a classification of training vectors. Because of GA s global optimum ability, using GA for codebook training can obsta...
1998, 20(4): 566-569.
Abstract:
A modified adaptive filter algorithm of smooth pseudo LMS(SPLMS) based on pseudo LMS(PLMS) is presented in this paper. Besides having advantages of PLMS, it has faster beginning convergence rate, lower misadjustment of weight, and better robustness a...
A modified adaptive filter algorithm of smooth pseudo LMS(SPLMS) based on pseudo LMS(PLMS) is presented in this paper. Besides having advantages of PLMS, it has faster beginning convergence rate, lower misadjustment of weight, and better robustness a...
1998, 20(4): 570-572.
Abstract:
In order to overcome slow convergence rate of the standard BP algorithm, this paper presents an adaptive backpropagation algorithm which can update learning rate and birr factor automatically based on dynamic training error rate of change. Simulation...
In order to overcome slow convergence rate of the standard BP algorithm, this paper presents an adaptive backpropagation algorithm which can update learning rate and birr factor automatically based on dynamic training error rate of change. Simulation...
1998, 20(4): 573-576.
Abstract:
Sparse-array Synthetic Impulse and Aperture Radar (SIAR) can isotropically radiate so that the long-time coherent integration can be obtained. But there are some problems in the process. An effective method of the long-time coherent integration is pr...
Sparse-array Synthetic Impulse and Aperture Radar (SIAR) can isotropically radiate so that the long-time coherent integration can be obtained. But there are some problems in the process. An effective method of the long-time coherent integration is pr...
