Patent ID: 7411899
Filing Date: 2008-08-12
Classification: H04B,H04J

Abstract:
1. For use in a base station of a code division multiple access (CDMA) wireless network, wherein said base station communicates with a plurality of wireless access terminals using transmit beams formed by an adaptive antenna array, an apparatus for allocating orthogonal codes used for downlink transmissions to said plurality of wireless access terminals comprising: a database capable of storing R active wireless terminal records, each of said R active wireless terminal records containing: 1) an active orthogonal code and 2) corresponding downlink beamforming coefficients used to communicate with one of said wireless access terminals; and a controller associated with said database capable of receiving a notification that a new wireless access terminal is accessing said base station and, in response to said notification, comparing said each of said R active wireless terminal records to new downlink beamforming coefficients suitable for forming a downlink transmit beam for transmitting to said new wireless access terminal and, in response to said comparison, determines at least one active wireless terminal record containing corresponding downlink beamforming coefficients that have the least correlation with said new downlink beamforming coefficients.