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Pilot pollution interference reduction using multi-carrier interferometry

Mobile stations, in CDMA systems, have the capability to communicate with multiple base stations whenever it is located in the fringe areas covered by overlapping base station. However, it is not desirable for an overlay area to contain pilot signals from a large number of base stations. As this would create pilot pollution interference and overload the mobile station's RAKE receiver. Therefore, the mobile station's RAKE receiver attempts to separate paths from three or more dominant pilot signals in the time domain to utilize path diversity. In each diversity (path/branch/finger), a large interference component exists due to the finger's own signal and other's signals. We demonstrated the power of using novel multi-carrier chip pilot pollution interference. Simulation studies have been carried out to verify the appropriateness of the proposed approach and we have obtained very promising results.