Method and apparatus for receiving code division multiple...

H - Electricity – 04 – J

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H04J 13/02 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2162569

Each of receiving spreaded signals from K users via L channels for each user is de-spreaded with a spreading code allocated to each user. Interference components among signal components in the de-spreaded signal vector Z obtained are eliminated by a de-correlation filter (33) and pilot signals are detected by a pilot detection part (34) from the interference-eliminated signal vectors for multiple frames. Each of the detected pilot signals is divided by the pilot signal's known symbol to obtain a transfer function in a transfer function interpolation part (35) and a transfer function between consecutive pilot signals is estimated from the transfer functions of the consecutive pilot signals. A de-spreaded signal vector Z is supplied to a de-correlation filter (36) and interferences among signal components are eliminated and transmission distortion is also eliminated using the estimated transfer functions. Regarding the KL signal components obtained in the above process, L signal components corresponding to each user are composited by a phase compensation and composition part (37) so that K composite signals are generated. Those composite signals are level decided by a decision part (38) to re- generate K symbols from K users.

Une unité de récompression (32) recomprime des signaux à spectre étalé reçus de K usagers via L lignes de transmission à l'aide de codes d'étalement de spectre assignés aux abonnés et d'un filtre à corrélation inverse (33) qui élimine les interférences entre les composantes des vecteurs z des signaux recomprimés. Une unité (34) détecte les signaux pilotes des vecteurs de signaux dont les composantes interférentielles ont été éliminées sur une série d'images, tandis qu'une unité d'interpolation (35) trouve les fonction de transfert en divisant les signaux pilotes par leurs symboles connus et détermine les fonctions de transfert entre signaux pilotes adjacents à l'aide des fonctions de transfert des signaux pilotes contigus. Les vecteurs de signaux recomprimés (z) sont transmis à un autre filtre de corrélation inverse (36) et les interférences entre les composantes du signal sont éliminées des vecteurs (z) tandis que les distorsions affectant la transmission sont éliminées à l'aide de fonctions de transfert déterminées ce qui génère les KL composantes du signal. Une unité de correction de phase et de synthétisation (37) produit K signaux synthétisés en combinant les L composantes des signaux de chaque usager, alors qu'une unité discriminatoire (38) évalue les niveaux des signaux synthétisés et reproduit les K symboles des K usagers.

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