We consider transmission of a continuous amplitude i.i.d source over an L-block Rayleigh fading Mt × Mr MIMO channel when the transmitter has no channel state information. Due to strict delay requirements Shannon’s source-channel separation theorem becomes obsolete and the optimal performance requires a joint optimization of the source and channel variables. Our goal is to minimize the expected...

We report a multi–dimensional quadrature amplitude modulation with M-ary differential phase shift keying (QAM-MDPSK) for optical access network transmission systems employing Mach–Zehnder modulator (MZM) and (PM) in direct detection system. Even though several problems that occur QAM-DPSK single MZM were solved, inter-signal distortion between two modulations remains when the signal is converte...

A time-of-flight camera suffers from significant range distortion due to the scattering artefact caused by secondary reflections occurring between the lens and the image plane. The reflected beam from the foreground objects undergoes multiple reflections within the camera device thereby introducing parasitic signals that bias the late-arrival, backscattered signals from the background targets. ...

Figure 1. (a) Conventional multi-standard transmitter architecture. (b) Flexible transmitter with no filters Abstract— In recent publications the Poly-phase multipath technique has been shown to produce a clean output spectrum for a power upconverter (PU) architecture. The technique utilizes frequency independent phase shifts before and after a nonlinear element to cancel out the harmonics and ...

The effects of a micrometer-scale silicon ring resonator with a FWHM of 0.078 nm (9.6 GHz) on a nonreturn to zero amplitude-modulated optical signal with a modulation rate of 10 Gbps are experimentally investigated. By transmitting the optical signal through the device, significant spectral distortion and side band attenuation is introduced, as characterized by amplitude Bode plots, and a power...

We model the impact of atmospheric turbulence-induced phase and amplitude fluctuations on free-space optical links using synchronous detection. We derive exact expressions for the probability density function of the signal-to-noise ratio in the presence of turbulence. We consider the effects of log-normal amplitude fluctuations and Gaussian phase fluctuations, in addition to local oscillator sh...

250 Abstract—Trellis coding combined with expanded signal sets has been considered in this paper to improve error performance over uncoded modulation. New communications services have created the demand for highly linear high power amplifiers (HPA's). Traveling Wave Tubes Amplifiers (TWTA) continue to offer the best microwave HPA performance in terms of power efficiency, size and cost, but lag...

Abstract We have investigated the waveform distortion of energetic particle driven off-axis fishbone mode (OFM) in tokamak plasmas with kinetic magnetohydrodynamic (MHD) hybrid simulations. extended our previous simulations (Li et al 2022 Nucl. Fusion 62 026013) by considering higher-n harmonics MHD fluid, where n is toroidal number. The successfully reproduced simulation for both magnetic fluc...

A non-linear ultrasonic technique has been used to assess the fatigue damage in low carbon structural steel. The percentage of total harmonic distortion, which is the ratio of the amplitude of 2nd harmonic and the fundamental, has been introduced as the measurement parameter in this paper. It has also been observed that before crack initiation the 2nd harmonic amplitude is comparable to the fun...

In the analysis of sound (for synthesis), digitally sampled audio is processed to extract certain features. The resulting data can be synthesised to reproduce the original sound, or modified before synthesis to musically transform the sound. The analysis primarily uses a harmonic model, which considers a sound to be composed of multiple nonstationary sinusoids. The first stage of analysis is of...