《多用户DS_CDMA系统下的PN序列盲估计算法》.pdf

20 6 Vol20 N o 6 JO URNAL OF ELECTRON IC 2006 12 M EA SUREM EN T AND IN STR UM ENT 45 DS/CDMA PN 程 皓 郭 伟 刘 飞 (, 610054) : DS/CDMA PN DS/CDMA , , , ,, , , : ,; , ICA;, , SNR= 0dB, : DS/CDMA, , : TN91442 : A BlindAlgorithm for PN SequencesEstimation forMultiusersDS/CDMA System Cheng ao GuoW ei (NationalKey Lab ofCommunication, UESTC, Chengdu, China) Abstract: Afastalgorithm for blind estmi ation ofPN sequences inmultiusersDS/CDMA system is presented. The algorithm utilizes the repeated characteristic in the system. The algorithm can separate theuserssPN sequence in low inputSNR, adopt the smi ply pluse or subtract operationwhich isdifficult for ICA. It isdifferent form conven tionalneuralnetwork algorithm: 1) The new algorithm can save theuserss amplitude information. 2)The calcula tion complication almosthavenot an influence in chip lenth due tow ithout using iterative algorithm. 3) W ithout the problem ofconvergence. The mi plement condition of the algorithm is analyzed and theperformance ofparameter es tmi ation ismeasured by computer smi ulation. Key ords: DS/CDMA signal, blind separation, PN sequence. DS/CDMA, (BSS), (BSE) Jutten CDMA erault[ 1] [ 2] - J [3] , (MA I) CDMA ; Common [4] , ( ICA); Bell Sejnowski , , Linsker( Infomax ) , [5] [ 6] ; Amari ( 1998) Cardoso