Static interferometers whose optical path difference is not constant over the field of interferences are well adapted to demodulate sensing interferometers in the coherence multiplexing method. In this configuration the correlation peak can be spatially recorded on a linear detector array. However, the determination of the position of the peak maximum amplitude is often difficult because of the...

This paper presents a significant modification to the Random Demodulator (RD) of Tropp et al. for sub-Nyquist sampling of frequency-sparse signals. The modification, termed constrained random demodulator, involves replacing the random waveform integral to the operation of the RD with a constrained random waveform that has limits on its switching rate because fast switching waveforms may be hard...

This article explores the possibility of cointegration existing between processes integrated at different frequencies. Using demodulator operator, we show that such can exist and explore its form using both complex‐ real‐valued representations. A straightforward approach to test for presence frequencies is proposed, with a Monte Carlo study an application showing testing works well.

Non-orthogonal multiple access (NOMA) is a promising scheme to improve the spectral efficiency, user fairness, and overall throughput in visible light communication (VLC) systems. However, error propagation problem together with linear nonlinear distortions induced by multipath, limited modulation bandwidth, nonlinearity of emitting diode significantly limit transmission performance NOMA-VLC In...

a direct conversion modulator-demodulator with even harmonic mixers with emphasis on noise analysis is presented. the circuits consist of even harmonic mixers (ehms) realized with antiparallel diode pairs (apdps). we evaluate the different levels of i/q imbalances and dc offsets and use signal space concepts to analyze the bit error rate (ber) of the proposed transceiver using m-ary qam schemes...

In this brief, we propose a new digital receiver for Phase-Shift Keying (PSK) modulation based on the integration of conventional Costas Loop circuit with timing recovery method. The is applied to PSK demodulator using an Iterative Learning Control (ILC) law and it minimization intersymbol interference only one sample per symbol. main advantage proposed method insensitivity frequency offsets wh...

Optical eigenvalue communication is a promising technique for overcoming the Kerr nonlinear limit in optical systems. The associated with Schrödinger equation remains invariant during fiber-based dispersive transmission. However, practical applications involving use of such systems are limited by occurrence fiber loss and amplified noise that induce distortion. Thus, several time-domain neural-...