Patent ID: 8000654
Filing Date: 2011-08-16
Classification: H04B

Abstract:
1. For use in a wireless network capable of communicating with K mobile stations in a cell site, a base station in the cell site capable of canceling interference caused by a dominant interferer signal from a plurality of mobile stations, said base station comprising: a radio frequency (RF) down-converter configured to receive an RF signal and outputting a down-converted signal, r(n); K complex pseudo-random noise (PN) demodulators configured to multiply said down-converted r(n) signal by at least one PN code sequence associated with each of said K mobile stations, said K PN demodulators producing K chip streams; K Walsh code demodulators, each of said K Walsh code demodulators configured to multiply one of said K chip streams by a Walsh code corresponding to the PN code sequence associated with one of said K mobile stations, said K Walsh code demodulators producing K raw user signals; K subtractors, each of said K subtractors configured to subtract a first estimated interference signal associated with said dominant interferer signal from one of said K raw user signals, said K subtractors producing K estimated user signals, wherein the first estimated interference signal is determined based on known interference components of only said K mobile stations located in the cell site that are transmitting packet data over a reverse data channel of the base station; and a detector configured to receive said K estimated user signals and detect a user signal for each of the K estimated user signals, the detector outputs the detected user signal unless the respective estimated user signal is below a first threshold value, wherein the base station selectively cancels interference caused by at least one of said K mobile stations located in the cell site that is transmitting packet data over the reverse data channel of the base station.