MOTIVATION Permutational non-Euclidean analysis of variance, PERMANOVA, is routinely used in exploratory analysis of multivariate datasets to draw conclusions about the significance of patterns visualized through dimension reduction. This method recognizes that pairwise distance matrix between observations is sufficient to compute within and between group sums of squares necessary to form the (...

A signal set whose root-mean-square inner product magnitude equals the Welch lower bound is called a WBE signal set. WBE signal sets are of interest in synchronous CDMA communication systems. This chapter surveys the known results on WBE signal sets and extends them in several ways. In particular, WBE signal sets over signal alphabets whose size is a prime power (the most important case is the ...

In this paper, we employ the concept of HMM-Sufficient Statistics (HMM-Suff Stat) and N-best speakers selection to realize a rapid implementation of Baum-Welch and MLLR. Only a single arbitrary utterance is required which is used to select the N-best speakers HMM-Suff Stat from the training database as adaptation data. Since HMM-Suff Stat are pre-computed offline, computation load is minimized....

We create a practical method to set the segment size of the Welch FFT for wideband and long-term spectrum usage measurements in the context of hierarchical dynamic spectrum access (DSA). An energy detector (ED) based on the Welch FFT can be used to detect the presence or absence of primary user (PU) signal and to estimate the duty cycle (DC). In signal detection with the Welch FFT, segment size...

We show that a family of cyclic Hadamard designs deened from regular ovals is a sub-family of a class of diierence set designs due to Gordon, Mills and Welch GMW]. Using a result of Scholtz and Welch SW] on the linear span of GMW sequences, we give a short proof of a conjecture of Assmus and Key on the 2-rank of this family of designs.

In direct spread CDMA systems, codebooks meeting the Welch bounds are used to distinguish among the signals of different users. Recently, constructions of codebooks with difference sets meeting Welch’s bound on the maximum cross-correlation amplitude were developed. In this paper, a generic construction of codebooks using almost difference sets is considered and several classes of codebooks nea...

Ethylbenzene is primarily produced by the alkylation of benzene with ethylene in liquid-phase slurry reactors promoted with aluminum chloride catalysts or by vapor-phase reaction of benzene with dilute ethylene-containing feedstock with a boron trifluoride catalyst supported on alumina (Cannella 2007; Clayton and Clayton 1981; HSDB 2009; Welch et al. 2005; Ransley 1984). Newer versions of the m...

– In 1983, Welch, L.R. and Berlekamp, E.R. introduced a new key equation based on rational interpolation for algebraically decoding Reed-Solomon (RS) codes over finite fields. A key feature of their so-called remainder decoding approach is that the computation of the syndrome vector corresponding to a given received word is not needed. For long codes, this implies significant computational savi...

In this paper, the theory of hidden Markov models (HMM) is applied to the problem of blind (without training sequences) channel estimation and data detection. Within a HMM framework, the Baum–Welch (BW) identification algorithm is frequently used to find out maximum-likelihood (ML) estimates of the corresponding model. However, such a procedure assumes the model (i.e., the channel response) to ...

Power spectrum estimation is one of the important applications in DSP. Basically a spectrum is a relationship typically represented by a plot of the magnitude or relative value of some parameter against frequency. In this Paper Non Parametric Methods are used for power spectrum estimation namely Periodogram Method and Welch Method. Here A Band pass FIR Filter using two different Window Techniqu...