Blind acquisition of digital communication signals

H - Electricity – 04 – L

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H04L 27/00 (2006.01) H04L 25/03 (2006.01) H04L 25/08 (2006.01)

Patent

CA 2260839

The digital communications receiver receives an analogue signal, modulated with digital information. The receiver converts the analogue signal to a digital signal, and demodulates the digital signal to recover the complex valued components of the transmitted digital signal. The complex valued components are low pass filtered and passed through an adaptive pre-equalizer filter, to reduce eigen value spread. The filtered complex valued signal is then subject to decision feedback equalisation, which operates using a series of adaptive filters additionally to remove artifacts of inter-symbol interference. The resulting filtered and equalized complex valued signal is then converted to a digital signal to recover the digital information.

Le récepteur de télécommunications numérique reçoit un signal analogique modulé au moyen d'informations numériques. Le récepteur convertit le signal analogique en un signal numérique et démodule le signal numérique pour récupérer les composantes valuées complexes du signal numérique transmis. Les composantes valuées complexes sont filtrées par un filtre passe-bas et envoyées à travers un filtre de pré-égalisation adaptatif pour réduire l'étalement des valeurs propres. Le signal valué complexe filtré est ensuite soumis à un égaliseur à décision rétroactive (DFE) qui fonctionne au moyen d'une série de filtres adaptatifs pour enlever encore les artefacts d'interférences inter-symboles. Le signal valué complexe égalisé et filtré résultant est ensuite transformé en un signal numérique de sorte que l'information numérique soit récupérée.

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