Iterative channel and interference estimation with dedicated...

H - Electricity – 04 – L

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H04L 25/02 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2574080

Estimation of channel characteristics and interference level in a time-varying multi-carrier multi-user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. Next, an initial estimate value is selected for the interference level. The initial estimate value for the interference level is used together with the received pilot symbols to provide a first estimate of the channel. The first estimate of the channel is used to determine a new updated value for the interference level, which in turn, is used to update the value of the first estimate of the channel iteratively. The iterations continue until the iteratively updated values of the interference level and channel satisfy predefined limits. The data symbols and the final updated value of the channel are subsequently used to proviEstimation of channel characteristics and interference level in a time-varying multi-carrier multi- user systems is carried out concurrently. To perform the estimation, a multitude of data symbols and dedicated pilot symbols are transmitted over the channel. Next, an initial estimate value is selected for the interference level. The initial estimate value for the interference level is used together with the received pilot symbols to provide a first estimate of the channel. The first estimate of the channel is used to determine a new updated value for the interference level, which in turn, is used to update the value of the first estimate of the channel iteratively. The iterations continue until the iteratively updated values of the interference level and channel satisfy predefined limits. The data symbols and the final updated value of the channel are subsequently used to provide a second estimate for the channel. A MMSE approach is followed where channel estimates and noise variance in an OFDM system are iteratively updted.

Selon l'invention, une estimation de caractéristiques de canal et de niveau d'interférence dans des systèmes multi-utilisateurs et multi-porteuses à variabilité temporelle est réalisée de manière simultanée. Pour réaliser cette estimation, une multitude de symboles de données et de symboles pilotes spécialisés sont transmis sur le canal. Ensuite, une valeur d'estimation initiale est sélectionnée pour le niveau d'interférence. La valeur d'estimation initiale pour le niveau d'interférence est utilisée conjointement avec les symboles pilotes reçus en vue de l'obtention d'une première estimation du canal. La première estimation du canal est utilisée pour déterminer une nouvelle valeur mise à jour pour le niveau d'interférence, lequel, à son tour, est utilisé pour mettre à jour la valeur de la première estimation du canal de manière itérative. Les itérations continuent jusqu'à ce que les valeurs mises à jour de manière itérative du niveau d'interférence et du canal satisfassent des limites prédéfinies. Les symboles de données et la valeur mise à jour finale du canal sont ensuite utilisés pour obtenir une seconde estimation pour le canal. Selon une approche MMSE, les estimations de canal et la variance de bruit dans un système OFDM sont mis à jour de manière itérative.

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