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The purpose of the present paper is to show that the linear phase property can be obtained with only a minor change in the regular FLS algorithm, with no additional multiplication, using the standard adaptation gain g(n). The proof is based on the linearly constrained filter called Generalized Sidelobe Canceller. Simulation results illustrate the efficacy of the simplified algorithm.
This paper investigates the convergence properties of a variable step normalized LMS (VSNLMS) adaptive filter algorithm. Instead of a fixed step-size used in the conventional normalized LMS algorithm, the step-size of the algorithm under study is updated in each iteration, based on an expression related to the output errors. The variable step-size improves the convergence speed, while sacrificing...
Even with use of restart intervals, some residual errors remain in the decoded JPEG images after transmission. In order to improve the image quality, robust decoding techniques are useful. First, we propose error detection techniques, then error compensation and concealment techniques for the damaged blocks. Depending on the entropy coding and on the neighbourhood template, improvements between 3...
The interpolation of complex signals is frequently encountered in the signal processing chains of high performance transmission systems. Linear interpolation might be inappropriate for this kind of situation and, here, geometric interpolation is proposed instead. Specifically, it is proposed, in a Filter Bank-based Multi-Carrier/Offset QAM (FBMC/OQAM) transmission system, to use geometric interpolation...
The application of multi-split equalizers is proposed as a means of diminishing the training sequence length. Reductions in the order of four to six times are presented for practical HDSL channels. The new structure is suitable for numerous applications, for instance, as the front end of any joint equalization and decoding scheme that makes use of a DFE in an iterative way.
An analysis is presented of the degradation introduced by using an interpolated FIR filter in the Wiener filtering structure. Applications such as channel equalization and echo cancellation are considered. The proposed degradation measure is a function of the input signal correlation, of the sparseness degree, and of the interpolator. It results from a joint approach combining interpolated transversal...
The robustness to transmission errors of JPEG coded images is investigated and techniques are proposed to reduce their effects. After an analysis of the JPEG transfer format, three main classes of transfer format constituents are distinguished, and a JPEG compatible approach is proposed to stop error propagation in the entropy coded data, with encoder and decoder reset after fixed coding interval...
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