Because of the features of pseudo randomness, noise-like behaviour, and the sensitivity of initial values and control parameters, chaotic mapping has widely been applied in the field of security telecommunication and video/image encryption. Additionally, in the past few decades the technology of chaotic mapping in security applications has made great progress, yet it has not become popular for ...

In this paper, it has been discussed and focused over the various frameworks on ad hoc networks. Since, it is not easy to follow all the aspects and issues over ad hoc networks followed by cross layer designing approaches. This paper discussed various frameworks supported by real-time multimedia, multi objective performance, multi-path transmission for Voice over Internet Protocol (VoIP) commun...

In Universal Mobile Telecommunication System (UMTS), high data rate transmission is possible by using Wideband Code Multiple Access technique (WCDMA) as an air interface. This paper studies performances of various modulation schemes such as Phase Shift Keying(both BPSK and QPSK) and M-ary Quadrature Amplitude Modulation (M-ary QAM) in WCDMA downlink transmission to improve its data rate. Based ...

Professor Wojciech Majewski was a specialist in the field of telecommunication acoustics, dealing particularly with issues analysis, synthesis, transmission and recognition speech speakers, as well methods assessing quality signal transmission. Particular scientific achievements include comparative research on subjective objective speaker under conditions voice masking imitation other leading p...

In this paper, we study transmission line resonances in high TC dc SQUIDs. These resonances are exhibited in the characteristics of SQUIDs which are fabricated on substrates with high dielectric constant, such as strontium titanate. The power balance equation is analytically derived both for symmetric and asymmetric SQUIDs. Using this, we investigate SQUID current voltage I(V ), voltage flux V ...

Current and voltage transformers influence the criterion values measurement particularly during disturbances in the system. Certain construction limitations of instrument transformers may in some cases cause maloperation or substantial delay in tripping of the protective relays. Current transformer saturation and discharging of the capacitive voltage transformer’s internal energy during short c...

In this paper, the transmission line theory is utilized to characterize the metamaterials comprising of microscopic elements of a periodic array, specifically, the traditional split-ring resonators (SRRs), as an example. The bianisotropic property of the metamaterials is characterized in a new way different from the existing wave methods. As evident from both simulations and experiments, the SR...

We study noise and noise energy of a high-Tc dc SQUID fabricated on a high-ǫR substrate whose conduction properties are given by transmission line physics. We show that transmission line resonances greatly enhance the noise. Remarkably, resistance asymmetry enhances these resonances even more. However, as the transfer function (dc dφ ) scales the same way, the noise energy is reduced by asymmet...

Introduction. The Butler matrix transforms the N channels of a phased array into a new set of so-called eigenmodes with useful properties for both reception [1] and transmission [2]. In the current work, we performed simulations of an eight-channel phased array based on microstrip transmission line (MTL) elements [3-4] and driven in an eigenmode configuration to investigate the effects of error...

An accurate and efficient modelling approach for field effect transistors (FET) as nonlinear active transmission lines is presented. The nonlinear active multiconductor transmission line (NAMTL) equations are obtained by considering the transistor as three active coupled lines operating in a nonlinear regime. This modelling procedure accurately spots the effect of wave propagation along the dev...