Time filtering for excess delay mitigation in ofdm systems

Details Time filtering for excess delay mitigation in ofdm systems Time filtering for excess delay mitigation in ofdm systems

H - Electricity

04

L

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

Patent

CA 2554602

Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, time filtering is utilized. Time filtering is utilized to combat excess delay spread effects in channel estimation. The time filtering is performed in the presence of staggered pilots and helps in improving the channel estimate in the presence of excess delay spread.

La présente invention concerne des techniques de transmission pilote et d'évaluation de canal pour un système à multiplexage par répartition orthogonale de la fréquence (OFDM) présentant une étendue de retard excessive. Afin d'atténuer les effets nuisibles d'une étendue de retard excessive, un filtrage temporel est mis en oeuvre. Ce filtrage temporel est utilisé pour combattre des effets d'une étendue de retard excessive dans l'évaluation de canal. Le filtrage temporel est effectué en présence de pilotes décalés et aide à améliorer l'évaluation de canal en présence d'une étendue de retard excessive.

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