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In this letter,by employing Gaussian distribution to approximate the probability density function(pdf) of the extrinsic information at the output of the multiuser detector as a function of the pdf of the input extrinsic messages,it is concluded that the Probabilistic Data Association(PDA) algorithm is equivalent to the Soft Interference Cancellation plus Minimum Mean Square Error algo-rithm(SIC-MMSE) .
In this letter, by employing Gaussian distribution to approximate the probability density function (pdf) of the extrinsic information at the output of the multiuser detector as a function of the pdf of the input extrinsic messages, it is concluded that the Probabilistic Data Association ) algorithm is equivalent to the Soft Interference Cancellation plus Minimum Mean Square Error algo-rithm (SIC-MMSE).