The present invention relates to a performance analysis method of a CSS system using a DM-BPSK modulation scheme in a multipath channel environment. The method according to the present invention provides a method for modeling a received signal received at a rake receiver through a channel in the CSS system. A first step of modeling an output of a correlator using the modeled received signal as an input, a third step of calculating a decision variable for a transmission signal from an output of the maximum ratio combiner using the output of the correlator as an input And a fourth step of calculating an average SINR (signal-to-interference and noise ratio) per channel using the determination variable, and a fifth step of deriving a bit error rate of the CSS system by calculating a cross correlation coefficient using the average SINR per channel. do.
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