Bidirectional turbo isi canceller-based dsss receiver for...

H - Electricity – 04 – B

Patent

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Details

H04B 1/7097 (2011.01) H04B 1/7115 (2011.01) H04L 1/00 (2006.01)

Patent

CA 2502814

A bidirectional turbo ISI canceller cancels precursor-ISI (94) as well as postcursor-ISI (90) in a received signal without incorporating a multiplicative feedforward equalization filter. This is accomplished by taking a three-step receiver design approach. In the first step, an optimal single- symbol RAKE receiver is 1 designed to comprise a CMF (9), a codeword correlator bank, and an energy bias EB (15) canceller under the assumption that no ISI is generated by preceding or trailing symbols. In a second step, a DFE (16) is included for suppressing postcursor-ISI (90) caused by a preceding symbol. Finally, a precursor-ISI (94) canceler is used to remove the remaining ISI caused by a trailing symbol. All three components may 10 be integrated into a BTIC-based receiver applying turbo-iteration processing.

L'invention concerne un annuleur d'ISI turbo bidirectionnel qui annule les ISI-précurseurs et les ISI-postcurseurs dans un signal reçu sans incorporer un filtre d'égalisation de correction aval multiplicative, ce que l'on obtient en adoptant une approche de conception de récepteur en trois étapes. Lors de la première étape, un récepteur RAKE de symbole unique optimal est conçu pour comprendre un CMF, un bloc de corrélateur de mots de code, et un annuleur de polarisation d'énergie (EB) en fonction de l'hypothèse qu'aucune ISI n'est générée par des symboles antérieurs ou de queue. Dans une deuxième étape, un DFE est inclus afin de supprimer des ISI-postcurseurs causées par un symbole antérieur. Enfin, on utilise un annuleur de ISI-précurseurs pour éliminer les ISI restantes causées par un symbole de queue. Les trois composants peuvent être intégrés dans un récepteur à base d'annuleur d'ISI turbo bidirectionnel (BTIC) appliquant un processus turbo-itération.

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