The Research On GO-MC-CDMA Baseband System And The Implement Of Channel Estimation

GO-MC-CDMA based on the merit of CDMA and OFDM technology is added with the grouping operation, which effectively reduce the complexity of multi-user detection algorithm. Channel estimation is a key technology of the GO-MC-CDMA system. The symbol interference in the multi-carrier communication can be eliminated effectively if this technology is used reasonably.The basic principles and system model of the GO-MC-CDMA are analyzed first in this author, then its key technology is introduced briefly. Secondly, the simulate model of the GO-MC-CDMA baseband processing system is constructed using the simulink which is a system-level simulation tools. The performance of the GO-MC-CDMA system is analyzed with different channel coding, digital modulation and different CP. Then the common channel estimation algorithm and interpolation algorithm are analyzed, and the advantages and disadvantages of each method are compared. For the defect of LS channel estimation, we give the improved scheme. The relationship between the mean-squared error (MSE) and the number of chosen first estimate value on the thinking of noise, and hence, the optimal criterion for obtaining the optimum number of first estimate value is explored, and carried out with fuzzy algorithm. The simulation shows that Fuzzy adaptive LS Channel Estimation is little affected by noise and its performance is better than that of traditional LS Channel Estimation. Finally, The GO-MC-CDMA baseband processing hardware platform based on DSP is designed, and the improvement of LS channel estimation algorithm is realized on the platform.