Concurrent process for blind deconvolution of digital signals
NOVELTY – The deconvolution is done by two filters (V,W) whose two signals which result respectively from the filtering action of each filter jointly define an output signal (y) of the deconvolutor system. The coefficients of the filter (V) are adjusted through gradient methods based on a cost function that measures a statistic dispersion of (y). The coefficients of the filter (W) are adjusted through gradient methods based on a cost function (JQ), which measures the distance from y to the nearest digital alphabet symbol (Q(y)), where the operator (Q(.)) represents quantization. The updating of the coefficients of filters W and V is such that the updating of the coefficients of W depends on the updating of the coefficients of V by means of a nonlinear function. USE – Blind deconvolution of digital signals is utilized in spatial-temporal processing, e.g. used in smart antennae and smart sensors; digital telecommunication systems in general, i.e. cellular telephony, digital television, digital radio; telemetry systems, remote sensing systems, geodesic localization/measurement systems such as GPS, navigation aid systems, seismic survey systems by wave refraction/reflection, magnetic media storage systems, RADAR systems, SONAR systems. ADVANTAGE – Deconvolution process eliminates the problem of intersymbol interference in digital signals, which is caused by the dispersive effect of any practical transmission channel. DETAILED DESCRIPTION – Details are included for: (i) any application and/or device that uses a system for the deconvolution of digital signals and that, to do so, uses the above working principle for the operation of Decision Feedback Equalizers (DFEs); (ii) any application and/or device that uses a system for the deconvolution of digital signals, whose operation is based in above working principles, in which QJyJ, required to the computation of JQ, is substituted with a temporal periodicity T during a time interval (t), where t is at most T,by the value obtained from a training sequence (d) sent by the digital signal transmitter; the training sequence (d) representing the sequence of symbols originally sent by the transmitter; with the training sequence being available to the deconvolutor system during the time interval (z), and being used as a reference for the deconvolutor system; (iii) any application and/or device that uses a system for the deconvolution of digital signals, whose operation is based on the above principles, independently of the nature of the transmission channel physical medium, e.g. electromagnetic, acoustic or optical media; (iv) any application and/or device that uses a system for the deconvolution of digital signals, whose operation is based on the above working principles applied to spatial-temporal processing, independently of the nature of the transmission channel physical medium; (v) any simulator, implemented in software and/or hardware, that uses a system for the deconvolution of digital signals, whose operation is based on the above working principles. DESCRIPTION OF DRAWING(S) – The drawing shows a schematic diagram of the concurrent equalizer which implements the concurrent process for blind deconvolution of digital signals.
Main Application Field
S03 (Scientific Instrumentation); U22 (Pulse Generation and Manipulation); W01 (Telephone and Data Transmission Systems); W02 (Broadcasting, Radio and Line Transmission Systems); W06 (Aviation, Marine and Radar Systems)
INVENTORS:
DE CASTRO MARIA CRISTINA FELIP
DE CASTRO FERNANDO CESAR COMPA
ARANTES DALTON SOARES