A lower bound for the coherence block (ChB) length in mobile radio channels is derived this paper. The ChB length, associated with a certain channel, of great practical importance future wireless systems, mainly those based on massive multiple input and output (M-MIMO) technology. In fact, it one factors that determines achievable spectral efficiency. Firstly, theoretical aspects regarding are ...

We consider a multiple-input, multiple-output (MIMO) wideband Rayleigh blockfading channel where the channel state is unknown to both the transmitter and thereceiver and there is only an average power constraint on the input. We compute thecapacity and analyze its dependence on coherence length, number of antennas and re-ceive signal-to-noise ratio (SNR) per degree of freedom. W...

We study, theoretically and experimentally, intensity noise induced by double Rayleigh scattering in long optical fibers. The results of the theoretical model are compared to experimental results performed with a high-coherence-length laser with a frequency noise spectrum that is dominated by 1/fν noise. Excellent quantitative agreement between theoretical and experimental RF spectra were obtai...

Focusing exclusively on the semantics of the words coherence and contradiction, it looks like they could be related concepts, considering that the more contradictory a couple of elements are, the less coherent they appear to be, and viceversa. Unfortunately, reviewing the concepts of contradiction degrees studied in [1] and [2], and coherence measures examined at length in [5], it is clear that...

We present a full-field reflection phase microscope that combines low-coherence interferometry and off-axis digital holographic microscopy (DHM). The reflection-based DHM provides highly sensitive and a single-shot imaging of cellular dynamics while the use of low coherence source provides a depth-selective measurement. The setup uniquely uses a diffraction grating in the reference arm to gener...

We present a novel interferometer for measuring angular distributions of backscattered light. The new system exploits a low-coherence source in a modified Michelson interferometer to provide depth resolution, as in optical coherence tomography, but includes an imaging system that permits the angle of the reference field to be varied in the detector plane by simple translation of an optical elem...

Objective: Many studies have suggested that there is a relationship between coherence and cognitive processes. This study aims at investigating this hypothesis through assessing the relationship between cognitive variables and coherence in the discourse of two groups of Persian-speaking younger and older adults. Methods: In order to evaluate our participants' cognitive capabilities, we recrui...