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This paper presents a new, linear algorithm for performing the roll operation on binary trees. Based on the inorder tree traversal, this algorithm has a very simple structure and achieves linear time and space complexity. A detailed analysis of this algorithm is presented, showing how its design contributes to a more streamlined operation and an improved time complexity over the original — and only...
Rounding error in the discrete Fourier transform calculated with fast fixed-point algorithms is considered. It is shown that the variance of the rounding error depends on frequency index. Theoretically obtained results for error variance are statistically checked on decimation-in-time fast Fourier transform with two rounding methods.
A fully-integrated and highly linear 79 GHz FMCW synthesizer that is based on fractional-N PLL and intended for automotive radar applications is presented. The frequency synthesizer covers complete automotive band 77–81 GHz of interest and is able to generate complex modulation waveforms with up to 16 different chirp slopes in the single modulation scheme. This helps eliminating potential ghost targets...
Prioritization of voice packets is useful to cope with packet losses in VoIP services by providing a mechanism to priority-enabled networks for dropping first the least important content, in order to reconstruct the best quality signal for user perception. A contribution to an efficient solution for voice packet prioritization is proposed in this paper, using an Arduino platform to implement a dynamic...
Justified and complete verification for hardware designs is a critical step as industrial hardware designs becomes more and more complex. Moreover, one of the most important aspects of verification is coverage which monitors during simulation which design specification, features and also RTL code area is being covered. Following how important coverage is, most hardware verification tools provide different...
In this paper, a compressed sensing approach for the reconstruction of 2D sparse signals with missing samples is presented. The statistical behavior of transform coefficients in the case of randomly undersampled signals is exploited as the basis of a simple algorithm for the signal support detection. With the detected signal support various reconstruction methods can be applied in the signal recovery:...
This paper demonstrates a wideband complementary LC-VCO using capacitive-source-degeneration (CSD) technique for WiFi and LTE applications. A cross-coupling pair is required to generate suitable-gm but the parasitic capacitance of the pair leads to a reduction of capacitance ratio of varactors and thus, tuning range of a VCO. Properly designing source-degeneration capacitance can relieve this reduction...
A new algorithm implemented as combination of gradient based and single iteration reconstruction algorithms for compressively sensed sparse signals is proposed in the paper. A good feature of the gradient algorithm to perform reconstruction for a wide range of applications is combined with the speed of single iteration algorithm in order to perform faster reconstruction in the cases where single iteration...
In this paper, a new approach for high quality automated exposure fusion on mobile or handheld devices is presented. A utilization of the device's viewfinder screen video feed data is proposed, in order to increase the overall performance of the exposure fusion, both in static scenes and in scenes with moving objects. The introduced novelties are computationally inexpensive, since the preview video...
We have designed a method for programmable NMR (N-modular redundancy) voters that relies on a binary matrix and enables easy scaling of the design regarding the number of voter inputs N. Thus, an automated construction of NMR systems is possible, given the basic module and arbitrary redundancy N. In this paper we present the mathematical aspects of the method, i.e., we analyze the properties of the...
The design of speaker diarisation and recognition systems is a mature research area and their deployment in the real world has gained momentum. There are still a number of parameters of these systems that have to be tuned and optimised for the application scenario at hand. An online call recording diarisation system is designed with integrated speaker identification of the call-centre operators. The...
A DC bus control strategy of an actively-controlled battery/ultracapacitor hybrid energy storage system for a full EV is presented in this paper. The control strategy is based on the PI DC bus voltage controller, wherein the DC bus voltage target is determined based on motor voltage demand. A feed-forward load compensator is also included in order to suppress DC bus voltage excursions under highly-variable...
This paper presents the design of a current control system for a single-phase grid-tied inverter equipped with a LCL grid-side filter, which is suitable for inverter DC current component suppression. For that purpose, a proportional-resonant (PR) controller of principal harmonic current component has been designed. This is followed by the design of DC current component estimator based on second-order...
Urban metro system consumes huge amount of electrical energy. Therefore, energy consumption, operating costs, and environmental impact of metropolitan transportation should be kept under the control. Capacity expansion and operation costs of urban rail systems are brought forward energy efficiency improvements in the urban rail transportation. Accordingly, there is urgent need to use renewable energy...
Direct phase or indirect frequency control methods are used in series-resonant bridge power inverters for induction heating to maintain maximum power transfer as the load equivalent electrical parameters change during the heating process. In these applications, to control the power level it is common to use the above resonance operating frequency, where only measurement of the deviation of the phase...
This paper concerns the problem of operating region enlargement for centrifugal pumps. A hybrid management system is described, which combines both the valve throttling and the pump speed adjustment at variable consumer's demands and piping conditions. Solution of the consumed power minimization problem is found and realized with the flexible energy management controller-oriented software. To provide...
This paper studies the segmented thyristor controlled reactors ST CR used to control the inductive reactive power with zero harmonic content in the developed current. This paper explains how to use STCR to produce inductive reactive power with discrete steps of operation from zero to full reactive power rating of the inductor. Paper studies several topologies used as STCR and illustrates the specifications...
This paper shows a case study of a partial discharge (PD) test in a 230kV/2000A circuit breaker that was performed in a substation. Two sorts of sensors were used: a high frequency current transformer (HFCT) installed in equipment's grounding conductor and an antenna that is used to estimate the location of discharge source. Partial discharge signatures obtained previously at the laboratory were used...
New regulation on cybersecurity for critical infrastructure mandates the implementation of a minimum set of security measures to achieve satisfactory security posture for the respective business domain. The organization responsible for operation of a given critical infrastructure may have some flexibilities in selecting recommended or mandatory national or international standards used for compliance...
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