Abstract: In the Decode-and-forward (DF) cooperative communication system, to suppress the effects of detector caused by non-Gaussian noise, a robust detector is proposed. The proposed detector adopts the limiter as the front-end of detector which aims to remove large-amplitude outliers that occur due to impulsive noise. In contrast to the existing limiters, the proposed limiter can set adaptively the threshold of limiter according to the received signal and doesn’t require knowing the Channel State Information (CSI) and the sending power of signal. The proposed system contains an equalization detector which would process the signals passing through limiter to trim the outlier noise components. The robust detector so designed is shown to outperform the conventional equalization detector without the limiter.