In this paper, the adaptive feedback interference cancellation system(AF-ICS) is suggested in order to cancel the feedback signal in the wireless communication system with the same frequency. AF-ICS prevents the oscillation of the receiver system and maintain the maximum output power of the power amplifier by the reduction of timevarflng feedback signal. The cancellation ratio and the error ratio of the adaptive detector are achieved as simulation result of 4 0 4 4 dB and the performance index(cancel1ation ratio and error ratio) of the adaptive detector is 13-15 dB in the system implementation. AF-ICS improves total channel power about 4.11 dBm under CDMA-3FA and 90 dB feedback loss.

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