The crosscorrelation and autocorrelation properties of the concatenated orthogonal/long PN sequence are analyzed. The results are used to evaluate the performance of this new spreading scheme for direct sequence spread spectrum CDMA in a multiuser/multipath fading environment. The channel is assumed to be Rayleigh or Rician faded. The analysis is carried out using two types of receiver: single ...

In S-PCFS, the intensities at both outputs of the interferometer are measured and the intensity crosscorrelation function g×(δ, τ) is calculated at different interferometer path-length differences δ for temporal spacings between photons τ . Reference [1] introduces the governing equation of S-PCFS, which relates g×(δ, τ) to the single-emitter and ensemble spectral correlation functions. g×(δ, τ...

Estimation of signal to noise ratio for the received signal is an important task in communication systems. In this paper, a novel approach for such estimation that uses zero point autocorrelation of received signal per block and auto crosscorrelation of decision feedback signal in orthogonal frequency division multiplexing (OFDM) system. The performance of the method is verified qualitatively a...

A diagnostic system using three frequency-resolved optical gating (FROG) techniques—crosscorrelation, second harmonic generation, and self-diffraction—is reported for the reliable characterization of femtosecond laser pulses. The latter two FROG techniques are employed to evaluate suitability in measurements of the reference pulse. A train of optical pulses generated by the superposition of two...

This paper examines feature selection methods in the context of milling machine tool wear diagnosis. Given raw sensor signals acquired during experiments, a pool of features was created through calculation by several feature extraction methods. Five techniques for selecting the most discriminating features were employed. These techniques included decision trees, neuralfuzzy methods, scatter mat...

Introduction A common problem in biomedical signal processing is signal detection in noisy data. If approximate signal features such as shape and duration are known, the signal’s presence and position in time can be estimated by pattern recognition techniques. A matched filter approach, already shown to aide identification of physiological signals embedded within white [l] or colored 121 noise ...

For a prime p ≡ 1 mod 4, an odd integer n, and d = p +1 p+1 + p −1 2 , we investigate the cross-correlation values of p-ary m-sequence m(t) of period p − 1 and its decimated m-sequence m(dt). It is shown that the crosscorrelation function between m(t) and m(dt) takes the values in { −1,−1± p,−1± 1+ √ p 2 p,−1± 1− √ p 2 p,−1± p−1 2 p } .

This paper introduces the use of a multi-variate correlation function for region-based image matching and extends it to a modified crosscorrelation function that works well when matching image areas are required have the same intensity contrast. It also shows that the multivariate case is a straightforward generalisation of the monochrome image case. Experiments with both MRI and RGB colour ima...

Sana Ullah Qaisar received his Masters degree in Telecommunication Engineering from the University of New South Wales, Australia in 2003. He has gained experience in the Telecommunication industry and served as a faculty member at NUCES, Islamabad (Pakistan). He is currently pursuing his PhD at School of Surveying & Spatial Information System, University of New South Wales, Australia. His resea...

Sana Ullah Qaisar received his Masters degree in Telecommunications Engineering from the University of New South Wales (UNSW), Australia in 2003. He has gained experience in the Telecommunications industry and served as a faculty member at NUCES, Islamabad (Pakistan). He is currently pursuing his PhD at the School of Surveying & Spatial Information System, UNSW, Australia. His research interest...