Abstract: We propose a blind adaptive multiuser detection in multipath CDMA channels based on CMOE criteria. Compared with other multiuser detection, this one take advantage of the structure and character of two subspace : (1) the subspace structure associated with the code of the desired user; (2)the estimated “signal subspace” of the covariance matrix for the observed signals. Simulations state this detection has strong ability against near-far,avoid significant reduction in performance when signature mismatch exists and good performance in the higher SNR conditions.

Key words: code division multiple access, constraint minimum output energy, blind multiuser detection