Approximation of acoustic Green’s functions through cross-correlation of acoustic signals in the ocean is a relatively young field that has become an area of interest over the past few years. Although the amplitudes of these estimates generally differ from those of the true Green’s Function, the estimated arrival structure can be highly accurate. Interhydrophone travel times extracted from thes...

This paper analyses the effects of random noise in determining errors and confidence levels for galaxy redshifts obtained by cross-correlation techniques. The main finding is that confidence levels have previously been overestimated, and errors inaccurately calculated in certain applications. New formulae are presented.

Herein, the interand intra-site correlation properties of shadow fading and power-weighted angular spread at both the mobile station and the base station are studied utilizing narrow band multi-site MIMO measurements in the 1800MHz band. The influence of the distance between two base stations on the correlation is studied in an urban environment. Measurements have been conducted for two differe...

In the vehicle communication system, transferred information is needed to be detected as possible as fast in order to avoid car accident and inform the road traffic fast. Fast communication defines that timing synchronization is detected fast. In this paper, we present combination method which can determine synchronization timing of frame is executed by auto-correlation and cross correlation si...

A reliable measure is one we can trust in the long run. Thus, the reliability of measurements is as important as their validity. Here we investigated the reliability of brain electrical visual evoked responses to faces and noise textures. For the first time, we provide reliability measures for the full time course of event-related potentials (ERPs). Our analyses were also performed on a R(2)(t)...

We analyse the temporal changes in the cross correlations of returns on the New York Stock Exchange. We show that lead-lag relationships between daily returns of stocks vanished in less than twenty years. We have found that even for high frequency data the asymmetry of time dependent cross-correlation functions has a decreasing tendency, the position of their peaks are shifted towards the origi...

We compute the asymptotics of the sample cross-correlation between two scalar moving averages whose IID innovations have regularly varying probability tails with different tail indices.

We present the radio light curves of lensed images of the gravitational lens B1422+231. The observations have been carried out using the VLA at 8.4 and 15 GHz over a period of 197 days. We describe a method to estimate the time delay from the observed light curves. Using this method, our cross-correlation analysis shows that the time delay between images B and A is 1.5±1.4d, between A and C is ...

In this paper, the properties of the WalshHadamard codes used as spreading codes in QCDMA cellular systems are analyzed. It is shown that among Walsh-Hadamard codes, obtained from Hadamard Matrix , only k 2 ) , 2 ( k H k 1 + k codes are orthogonal to each other in all phases. Also, the performance of the Walsh Hadamard codes is compared with that of the Gold codes from the average cross-correla...

We consider the cross-correlation of a Costas array with its image under a horizontal and/or a vertical flip. We propose and prove several bounds on the maximal cross-correlation and on its value at the origin, for both general Costas arrays and for algebraically constructed ones.