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This paper describes a blind cochannel interference cancelling technique, indirect cochannel interference cancelling (ICIC), that cancels a constant envelope modulated interferer in cellular mobile radio communication channels. ICIC exploits the constant envelope property of the interfering signal to simplify the receiver structure. The basic concept of ICIC and the possible receiver structures are discussed. The performance of a ICIC receiver in practical channels as well as its sensitivities to the channel parameters are investigated by simulation.