Method and apparatus for implementing space frequency block...

H - Electricity – 04 – B

Patent

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H04B 7/04 (2006.01) H04B 7/208 (2006.01) H04J 11/00 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2576842

The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.

L'invention concerne un procédé et un appareil de mise en oeuvre de codage de blocs à fréquences spatiales (SFBC) dans un système de communication sans fil de multiplexage par répartition en fréquences orthogonales (OFDM). L'invention est applicable à la fois en mode boucle fermée et en mode boucle ouverte. Dans le mode en boucle fermée, la charge de puissance et la propre formation de faisceaux sont effectuées sur la base de l'information d'état du canal (CSI). Un flux de données codées de canaux est multiplexé en deux ou plusieurs flux de données. Le codage SFBC est effectué sur la base de CSI pour répartir les propres faisceaux aux antennes de transmission multiples. La charge de puissance peut être effectuée sur deux ou plusieurs blocs de codage SFBC ou sur chaque mode propre. En outre, la charge de puissance peut être effectuée par des sous-porteuses ou des groupes de sous-porteuses pour des modes propres faibles.

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