2002 International Telecommunications Symposium

"In this work, the problem of blind multichannel equalization is considered. A strategy for saving computation in zero-forcing equalizers design is proposed and its performance is evaluated under an adaptive implementation of an algorithm based on multichannel forward linear prediction. Moreover, a cascade structure based on forward and backward linear...

"The LMK algorithm is a stochastic gradient algorithm which seeks to minimize the negated kurtosis of the error signal. It outperforms the LMS algorithm in several applications of practical interest, with little increase in computational complexity. This paper presents a statistical analysis of the Least Mean Kurtosis (LMK) adaptive algorithm....

"A new multiplication-free transformation derived from DHT is introduced: the RHT. Investigations on the properties of the RHT led us to the identification of an approximate inverse. We showed that RHT is not involutional like the DHT, but it exhibits approximate involutional property. Thus instead of using the actual inverse transform, the RHT is taken...

"In this paper, the use of adaptive interpolated FIR-LMS structures for echo cancelling in digital telephone systems is assessed. These structures are compared with the widely used FIR-LMS one. By using interpolated structures, it is possible to achieve substantial savings in the required arithmetic for both filtering and tap updating operations....

"The Q-GA (modified genetic algorithm) has been proposed to design phase equalizers by using the symmetry error criterion of the impulse response. In this approach, the search space is partitioned into subspaces in which a small population evolves, regarding a reduced number of generations. This approach presents a considerable computational complexity...

"This paper presents a new analytical model for predicting the behavior of Affine Projection (AP) algorithm. The model is derived for autoregressive (AR) Gaussian inputs and for unity step size (fastest convergence). Deterministic recursive equations are determined for the mean weight and the mean square error behaviors for a large number of adaptive...

"An optimization procedure for cosine-modulated filter banks (CMFB) using the frequency-response masking approach is proposed. In the given method, we perform minimization of the maximum attenuation level in the filter\u2019s stopband, subject to intersymbol interference (ISI) and intercarrier interference (ICI) constraints. For optimization, a...

"A new method for designing narrowband cosine-modulated filter banks (CMFBs) is proposed based on the frequency-response masking (FRM) approach with masking filter decomposition. The resulting structure, the so-called FRM2-CMFB, presents a reduced computational complexity, and allows one to design filter banks with extremely high number of bands, where...

"A new adaptive LCMV solution that avoids DOA estimation for uplink beamforming is proposed. The use of the uplink channel covariance matrix (UCCM) instead of DOA estimation is shown to be a suitable alternative for constraints selection. The resulting LCMV adaptive solutions are then based on the LMS and RLS versions with the UCCM estimation. The new...

"We will present, in details, an algorithm for the Stabilized Inverse Diffusion Equation (SIDE) technique introduced in [4]. The algorithm will be evaluated in two different application areas of interest, which are: signal detection and image segmentation. SIDEs are a family of semi-discrete evolution equations which stably sharpen edges and suppress...