A concise statement of a recursive fuzzy estimator and probabilistic fuzzy identifier is presented as elements of a systematic fuzzy modelling technique capable of emulating a prototype dynamic system for which only t...
A concise statement of a recursive fuzzy estimator and probabilistic fuzzy identifier is presented as elements of a systematic fuzzy modelling technique capable of emulating a prototype dynamic system for which only the input—output behaviour is given. The application of these techniques to derive a fuzzy model of a human operator as controller in a tracking loop is illustrated. A number of fuzzy analysis tools are used in order to investigate the resultant fuzzy model mechanisms.
A new modulation technique, SP-QPSK (sinusoidal shaped pi /4-QPSK), suitable for land-mobile and satellite digital-broadcasting systems applications is introduced. In digital data and/or sound broadcasting systems, wh...
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A new modulation technique, SP-QPSK (sinusoidal shaped pi /4-QPSK), suitable for land-mobile and satellite digital-broadcasting systems applications is introduced. In digital data and/or sound broadcasting systems, which may have a relatively low bit-rate transmission requirement, the residual phase noise introduced by the Doppler shift of moving vehicles presents a high bit-error floor in coherently demodulated systems. The overall performance of noncoherent systems is frequently superior in a mobile radio environment. In addition, to satisfy the high-power and spectral-efficiency requirements of emerging digital-broadcast systems, nonlinear saturated amplifiers may become essential subsystems. The performance of the new generation of SP-QPSK systems is investigated experimentally and by computer simulations. digital signal processing implementation techniques have been used in the experimental prototype design. The authors demonstrate that nonlinearly amplified SP-QPSK has a 10-dB-lower out-of-band radiated power than conventional QPSK and it is suitable for differential and discriminator detection.
This paper investigates some approaches for designing one-dimensional linear phase finite-duration impulse-responses (FIR) notch filters, which are based on the modification of several established design techniques of...
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This paper investigates some approaches for designing one-dimensional linear phase finite-duration impulse-responses (FIR) notch filters, which are based on the modification of several established design techniques of linear phase FIR band-selective filters. Based on extensive design examples and theoretical analysis, formulae have been developed for estimating the length of a linear phase FIR notch filter meeting the given specifications. In addition, the design of two-dimensional linear phase FIR notch filters is briefly considered. Illustrative examples are included.
Basic research for the micro actuator using TiNi Shape Memory Alloy (SMA) is conducted from the crystallographic point of view. SMA (TiNi) thin film is fabricated by sputtering deposition. First, the influence of subs...
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The term "rapid system prototyping" is introduced in the context of academic research in digitalsystems. The technological issues as well as issues of policy which affect system prototyping in academia are ...
The Multiport Array Receptor (MAR), a system which combines optical sensing with integrated focal-plane processing capabilities, is described. Its central element is a photosensor array with hexagonal tesselation and ...
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The Multiport Array Receptor (MAR), a system which combines optical sensing with integrated focal-plane processing capabilities, is described. Its central element is a photosensor array with hexagonal tesselation and complex peripheral selection logic which provides parallel analog readout over prescribed areas. An external computing module performs real-time spatial convolution at multiple resolutions while a closed-loop microprogrammed controller addresses regions of interest and supervises communication between the camera and the host computer. This integrated image sensor and processor implements programmed sequences of instruction primitives and yields a complete state description of each processed pixel. It is capable of automatic edge tracking and returns lists of connected pixels.< >
Basic research for the micro actuator using TiNi shape memory alloy (SMA) is conducted from the crystallographic point of view. SMA (TiNi) thin film is fabricated by sputter deposition. First, the influence of substra...
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Basic research for the micro actuator using TiNi shape memory alloy (SMA) is conducted from the crystallographic point of view. SMA (TiNi) thin film is fabricated by sputter deposition. First, the influence of substrate temperature on crystal structure is verified by measuring resistivity-temperature curve and X-ray diffraction. Though high temperature substrate conditions make TiNi film in regular crystal, an amorphous structure appears at low substrate temperature. Next optimal composition of sputtered SMA thin film is found by SSQ. The negative slope of the resistivity curve due to phase transformation between R-phase and parent phase is observed. Finally, annealing methods are examined to crystallize amorphous TiNi.< >
A precondition verification system for high-level (register-transfer-level) design transformations is described. The system can verify spatial preconditions in terms of the data path composition and topology, as well ...
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A precondition verification system for high-level (register-transfer-level) design transformations is described. The system can verify spatial preconditions in terms of the data path composition and topology, as well as temporal preconditions in terms of assertions on the control flow paths. The system is implemented in Prolog and incorporates a mixture of techniques including symbolic equivalence and partial evaluation to effectively verify the preconditions in the presence of arbitrarily nested data-dependent decision points (conditional and iterative constructs) in the control graph. An example which shows how the system can be used for precondition verification is presented.< >
For fast-fading digital mobile systems, a spectrally efficient technique that can achieve more than 2 bit/s/Hz with a built-in fade canceler is proposed. Recent studies show that fading in digital mobile communication...
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For fast-fading digital mobile systems, a spectrally efficient technique that can achieve more than 2 bit/s/Hz with a built-in fade canceler is proposed. Recent studies show that fading in digital mobile communications can be canceled by adding redundant bits to the customer data or with pilot-based techniques. The objective is to extend this concept to a more spectrally efficient class IV quadrature partial-response signaling (QPRS) system. However, in such schemes, if the pilot is corrupted by the phase noise caused by the pilot-data interference, the fade cancellation will not effectively remove the error floor. The class IV system has an inherent advantage in that it has a spectral null at DC and a low energy content at the ends of the band. Such systems also have a higher speed tolerant. It is shown that a small bandwidth around DC can be vacated to insert the pilot. Preliminary results indicate that the residual error floor can be reduced from 10/sup -2/ to 10/sup -5/ in fast-fading channels. The improvement in bit error ratio performance of the band-vacated QPRS is compared to the unfiltered QPRS.< >
The term "rapid system prototyping" is introduced in the context of academic research in digitalsystems. The technological issues as well as issues of policy which affect system prototyping in academia are ...
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The term "rapid system prototyping" is introduced in the context of academic research in digitalsystems. The technological issues as well as issues of policy which affect system prototyping in academia are presented, as well as opportunities stemming from a rapid system design cycle. The complementary role of academia and industry in the development of systems is outlined.< >
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