Research Of Semi-blind Channel Equalization On Group-orthogonal Multi-carrier Code Division Multiple Access(GO-MC-CDMA) System

People’s quality of communication are deeply influenced by Inter-symbol interferencewhich is caused by Multipath transmission and multi-user communication, in order tofurther improve the quality of communication and eliminate inter-symbol interference andmulti-user interference become the focus of the current need to be overcome. This paperfocuses on communication systems GO-MC-CDMA packet number, channel equalizationalgorithm two aspects of the research, for improving the quality of communication andovercome inter-symbol interference and multi-user interference and have achieved certainresults.(1)Deeply studied the transmission based on communications systems suitable formodern intelligent buildings. For group orthogonal multi-carrier CDMA Packet(Group-orthogonal Multi-carrier CDMA, GO-MC-CDMA) system in a reasonablegrouping can get a good frequency diversity effect and to ensure the feasibility ofmaximum likelihood detection characteristics, by constructing MATLAB/simulinksimulation model, through the GO-MC-CDMA packet within the system to adjust the size,combined with a comprehensive analysis of the simulation results and the computationalcomplexity come to the most appropriate number of packets.(2)In order to improve the capacity of remote data transmission system and effectiveresistance ISI proposed to GO-MC-CDMA as a based communication systems. Focuses onthe system channel equalization algorithms: algorithms for channel equalization slowconvergence and convergence precision is not high enough flaws, this paper applies tohigh-order QAM signal blind equalization algorithms and semi-blind equalizationalgorithms. Where dual mode multi-modulus blind equalization algorithm to convergefaster, relatively low complexity of the algorithm is based MMA model to better balancethe MAMA for the second mode, the two algorithms for high-order QAM signals simultaneously equalization; semi-blind equalization algorithm is automatically switchedto the decision directed algorithm based on the conditions on the basis of the decision onDMMA ultimately achieve a balanced channel. Simulation results shown that the twomethods are fast, steady-state error is small, and can eliminate inter-symbol interference,while deflection correction phase, with good usability.