The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The following topics were dealt with: traffic and resource management; ad-hoc networks; image processing; IT applications; modulation and coding; time-frequency analysis and wavelets; electronic devices; biomedical engineering; CDMA; power systems planning and control; array and space-time signal processing; Internet applications; security issues; robotics; microwave circuits; speech signal processing...
The unresolved problem of finding an adaptive LMS structure for ternary filters has substantially limited their useability despite their major advantage of hardware simplicity. In this paper we tackle this challenging problem by introducing an algorithm that seems to be quite promising. Results were surprising as it appeared that the proposed ternary algorithm is comparable in performance to the multi-bit...
Adaptive filters are important application in the signal processing field. This paper discusses the adaptive local noise removal algorithm proposed by Professor Rafael C. Gonzalez and points out its shortcomings. To improve the algorithm, a new method, geometric mean based adaptive local noise removal algorithm, has been proposed. The simulation results indicate that the new algorithm is more satisfactory...
A new human identification system based electrocardiogram (ECG) signal is introduced in this work. The human heart is considered to be a unique system of each person. ECG signal therefore represents as an impulse response of the system. The frequency response of the system (Fourier transform of the ECG signal) is employed to be a tool for feature extraction. In addition, the ECG signals employed in...
When differential protective relay is applied to transformer protection, how to identify the magnetizing inrush current and short circuit current caused by internal fault is the key problem. Here, regarding the inrush current and short circuit current as the random signal, the sampled data are analyzed by correlation function principle in the digital signal processing (DSP) and the self-correlation...
By constructing the cyclic autocorrelation matrix with Hermitian property, a Hermitian mapping method (HMM) is proposed which is appropriate for both cyclic MUSIC and conjugate cyclic MUSIC in this paper. By exploiting the cyclostationarity of the signals of interest (SOIs), this approach not only allows to select uncorrelated desired signals ,but also has a better performance in the presence of multipath...
This paper reports a novel scalable CMOS four-quadrant multiplier design with wide-signal swing and wide bandwidth enabling numerous applications in communication signal processing. The multiplier operates in a scalable voltage range between 3.3 V and 1 V power supply with a maximum input dynamic range of 500 mV(@ 3.3 V supply) at both the inputs (multiplier & multiplicand inputs) and a -3 dB...
In a recent work we have proposed a subclass of Cohen's Class of quadratic time-frequency distributions (TFD's), the T-class of distributions with time-only Doppler-lag kernels to provide high-resolution and considerable cross-terms reduction for FM signals. In this work we investigate the instantaneous frequency (IF) properties of two members of this class: the hyperbolic and the exponential T-distributions...
In this paper, we propose a novel optical signal processing technique for a beam-forming network in cellular mobile basestation. The inverse piezoelectric effect in PVF2 coated single mode fiber is employed to control the phase and amplitude weights of each element of the smart antenna array. The antenna weights are calculated for the given look direction and null directions using maximum directivity...
Remote auto-tuning is studied and implemented successfully. Remote tuning of PD controller parameters is achieved using Internet technology, specifically client/server technology. Proportional derivative (PD) control is widely used in active magnetic bearing (AMB) systems, however the tuning of its parameters is quite time consuming. In this paper, a solution to the problem is investigated in which...
With the development of mobile communication and internet technologies digital media can be transmitted conveniently over the network. In this process the algorithms used to protect secret messages during transmission become an important issue. This paper presents a new high capacity image steganograpic model based on discrete cosine transform (DCT), vector quantisation (VQ) and a pseudo random number...
This paper presents an algorithm for estimating the time-varying Doppler return signal from a target which has a time-varying acceleration, with this changing acceleration being modeled as a linear function of time. The method involves modeling the return signal as the sum of a number of constant amplitude cubic phase signals embedded in noise. An algorithm is presented for estimating the phase parameters...
An innovative measurement technique for use by positioning systems using ultrasonic signals was developed. The advantage of this technique is that it can accurately identify the relative distance and orientation between devices by using an one-time ultrasonic packet. It is therefore especially useful for ubiquitous computing applications where people with mobile devices continuously change their positions...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.