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该文提出一种新的估计CDMA系统的误码率的方法,得出了较高斯函数更精确的多址干扰的密度函数,我们得到的解析结果首次可解释扩频增益变大、传统高斯估计法不准的原因“,”A new method to evaluate the bit error probability of CDMA system are proposed The probability density function more accurate than Gauss function of multiple access interference (MAI) are obtained The reason that the traditional Gaussian approximation isnt suited for the CDMA system when spreading gain is large is found firstly from our analytic results