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Radio frequency (RF) adaptive self-interference cancellation system (RFAICS) is extensively used to suppress the self-interference of radios operating in the same plat- form, suchasmilitarycommandvehicles, airplanesandnavy vessels. RFAICS is generally consisted of couplers, attenua- tors, delay units, amplifiers, and filters and so on. However, RFAICS usually suers severely from the imperfect attenua- tors. This paper firstly explores the RFAICS operation pro- cess in theory, and then thoroughly investigates and analyzes the negative eects of non-ideal attenuators on performance of RFAICS. The closed-form expressions fully describing the influences of attenuation bias and response-time respectively on the interference cancellation ratio (ICR) and system con- vergencetime(SCT)aredevelopedwiththisaim. Simulations are provided for the validity of the limitation analysis and ob- tained expressions. Results of simulations are in agreement with theoretical analysis, which is significant for component configuration in taking RFAICS into practice.

Performance Limitations Analysis of Imperfect Attenuators for Adaptive Self-Interference Cancellation Systém