This paper proposes the application of M -ary orthogonal Walsh modulation for an OFDM-CDMA uplink transmission. Beside the examination of general system properties, it is shown that decision-directed phase estimation represents a channel estimation concept suitable for the new system. The Walsh modulation can also be interpreted as a linear block code with low decoding complexity, and the paper...

this paper proposes a flexible power electronic transformer (fpet) for the application in the micro-grids. the low frequency transformer is usually used at the point of common coupling (pcc) to connect the low voltage grid and utility network to each other. the conventional 50hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. in this pap...

Modulation forensics detect the modulation type in wireless communications by the received signal only. It provides a powerful tool for spectrum sensing since by identifying the modulation type, the secondary users in cognitive radio systems can detect whether the primary user occupies the spectrum. In this paper, we investigate modulation forensics of linear digital modulations and space-time ...

In this study, a theoretical systematic approach is introduced as solution of the bandwidth problem multi-tone network systems. This proposes use unused harmonic components non-linear distortion produced by semiconductor laser diode, which used source in infrastructure fiber optic communication system. order to separate these frequency from others, it possible add protocol each difference signa...

The technique of estimating the complex frequency components a signal in presence noise based on assumptions about number is known as estimation. problem estimation appears when we receive from transmitter with frequency, and it often radar, sonar, etc. applications. This has been dealt by various techniques algorithms. research shows methods used researchers to estimate paper discusses between...

The offset linear canonical transform (OLCT) is the name of a parameterized continuum of transforms which include, as particular cases, the most widely used linear transforms in engineering such as the Fourier transform (FT), fractional Fourier transform (FRFT), Fresnel transform (FRST), frequency modulation, time shifting, time scaling, chirping and others. Therefore the OLCT provides a unifie...

In this paper, three state of the art non-stationary sinusoidal analysis methods based on Fourier transform (FT) are compared the derivative method, reassignment and generalized reassignment. 1 The derivative method and reassignment were designed to analyze linear log-AM/linear FM sinusoids. Generalized reassignment can analyze sinusoids containing arbitrary order modulations, however the discu...

Complex sounds, especially natural sounds, can be parametrically characterized by many acoustic and perceptual features, one among which is temporal modulation. Temporal modulations describe changes of a sound in amplitude (amplitude modulation, AM) or in frequency (frequency modulation, FM). AM and FM are fundamental components of communication sounds, such as human speech and speciesspecific ...