The baseband signal will be influenced by the channel which bandwidth is limited with external interference, the baseband signal will generate inter symbol interference. The raised cosine FIR filter is usually used to suppress inter symbol interference in statistical detection, and it also needs strict synchronous. This paper gives out a method to suppress inter symbol interference by the transient detection, which can eliminate the external interference at same time in the process of detecting

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... detected signal, The experiment about suppression of the inter symbol interference and the additive white noise in the transient detection theory is also set up, which can play a more effective role in suppressing the inter symbol interference.