Patent ID: 6760315
Filing Date: 2004-07-06
Classification: H04B

Abstract:
In a radio receiver, a method of estimating a desired modulated signal received by the receiver, by canceling interference from a plurality of signals received from a plurality of transmitting radio stations, said transmitting radio stations simultaneously transmitting modulated radio signals using a multiple access method, said method comprising the steps of:receiving a radio signal that comprises a sum of the plurality of signals transmitted by the plurality of transmitting radio stations; demodulating the received signal to form a base band signal that comprises a sum of the base band signals of each of the plurality of transmitting radio stations; dividing the base band signal into a plurality of divided base band signals, wherein each of the divided base band signals includes desired base band signals from different channels from a corresponding group of transmitting radio stations; separately processing each of the divided base band signals to isolate and cancel interference from at least some of the transmitting radio stations in each base band signal's corresponding group of transmittng radio stations, said processing step being performed in a separate interference cancellation unit for each divided base band signal, and being performed In accordance with the multiple access method utilized by the transmitting radio stations, said processing step producing post-processing information and an estimated modulated signal for the unit's corresponding group of transmitting radio stations; providing the post-processing information from each of the separate interference cancellation units to each of a plurality of next-stage processors corresponding to each of the interference cancellation units; providing the estimated modulated signal for each group of transmitting radio stations to the next-stage processor corresponding to the group's interference cancellation unit; and estimating the desired modulated signal received by the receiver by utilizing the post-processing information to enhance processing in the next-stage processors.